WO2020195554A1 - Hydraulic rotary machine - Google Patents

Hydraulic rotary machine Download PDF

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Publication number
WO2020195554A1
WO2020195554A1 PCT/JP2020/008520 JP2020008520W WO2020195554A1 WO 2020195554 A1 WO2020195554 A1 WO 2020195554A1 JP 2020008520 W JP2020008520 W JP 2020008520W WO 2020195554 A1 WO2020195554 A1 WO 2020195554A1
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WO
WIPO (PCT)
Prior art keywords
flow path
side connection
connection portion
discharge
suction
Prior art date
Application number
PCT/JP2020/008520
Other languages
French (fr)
Japanese (ja)
Inventor
健 児玉
哲也 岩名地
健幸 島村
洸太 瀬野
Original Assignee
Ｋｙｂ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ｋｙｂ株式会社 filed Critical Ｋｙｂ株式会社
Publication of WO2020195554A1 publication Critical patent/WO2020195554A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C2/18—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms

Definitions

  • the present invention relates to a hydraulic rotary machine.
  • a gear pump having a pair of gears housed in the body is known (see JPH6-1471136A).
  • the gear pump described in Patent Document 1 includes a body incorporating a pair of gears, a mounting flange that closes one open end face of the body, and a cover that closes the other open end face of the body.
  • a suction port and a discharge port are formed on the cover.
  • An object of the present invention is to suppress the generation of noise while suppressing the increase in the weight of the hydraulic rotary machine.
  • the hydraulic rotary machine includes a case member and a rotating shaft that rotates with respect to the case member, and the case member protrudes from the main body portion and the main body portion.
  • a suction flow path forming portion that forms a part of the suction flow path, a discharge flow path forming portion that protrudes from the main body portion and forms a part of the discharge flow path, and a suction flow path forming portion that protrudes from the main body portion and forms the suction flow path. It has a rib that connects the portion and the discharge flow path forming portion.
  • FIG. 1 is a vertical sectional view showing a gear pump according to the first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view showing a pair of gears.
  • FIG. 3 is a front view of the rear cover of the gear pump of FIG.
  • FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG.
  • FIG. 5 is a front view of the rear cover of the gear pump according to the second embodiment of the present invention.
  • FIG. 6 is a side view of the rear cover as viewed from the IV direction of FIG.
  • FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG.
  • FIG. 8 is a cross-sectional view taken along the line VIII-VIII of FIG.
  • FIG. 9 is a front view of the rear cover of the gear pump according to the modified example of the first embodiment of the present invention.
  • the hydraulic rotary machine functions as a pump capable of discharging a working fluid by rotating the rotating shaft 11 by an external power. Further, the hydraulic rotary machine also functions as a motor capable of outputting a rotational driving force by rotating the rotating shaft 11 by the fluid pressure of the working fluid supplied from the outside.
  • the hydraulic rotary machine may function only as a pump or may function only as a motor.
  • the gear pump 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 4.
  • the gear pump 1 rotates while a pair of gears (acting portions) are engaged with each other to discharge hydraulic oil as a hydraulic fluid.
  • the gear pump 1 includes a drive gear 2 and a driven gear 3 as a pair of gears, and a case 4 accommodating the drive gear 2 and the driven gear 3.
  • the rotary shaft 11 is coupled to the drive gear 2, and the rotary shaft 15 is coupled to the driven gear 3.
  • the rotary shaft 11 may be provided so as to be rotatable integrally with the drive gear 2, and may be connected to the drive gear 2 separately from the drive gear 2, or may be integrally molded with the drive gear 2. It may be a single part.
  • the rotating shaft 15 may be provided so as to be integrally rotatable with the driven gear 3, and may be connected to the driven gear 3 separately from the driven gear 3, or may be integrally formed with the driven gear 3. It may be a single part.
  • the case 4 includes a tubular body 104B having both ends open, and a pair of covers (front cover 104F and rear cover 104R) arranged so as to sandwich the body 104B. That is, the body 104B, the front cover 104F, and the rear cover 104R are case members that form a part of the case 4. A pair of covers (front cover 104F and rear cover 104R) close the openings at both ends of the body 104B to form a working fluid chamber (space) inside the case 4.
  • the front cover 104F and the rear cover 104R are fastened by a fastening member such as a bolt.
  • the front cover 104F is attached to an external device to which the gear pump 1 is attached via a support member (not shown). That is, the front cover 104F functions as a mounting flange.
  • the body 104B has a pair of gear chambers 7 and 8 in which the drive gear 2 and the driven gear 3 are incorporated, respectively.
  • a low pressure chamber 43 is formed on the low pressure side of the gear chambers 7 and 8 in the body 104B
  • a high pressure chamber 44 is formed on the high pressure side of the gear chambers 7 and 8 in the body 104B.
  • the low pressure chamber 43 and the high pressure chamber 44 are formed so as to sandwich the gear meshing portion 23 of the drive gear 2 and the driven gear 3.
  • the rear cover 104R has a suction flow path 101 communicating with the low pressure chamber 43 (see FIG. 2) formed in the body 104B and a high pressure chamber 44 (FIG. 2) formed in the body 104B.
  • a discharge flow path 102 communicating with (see) is formed.
  • the suction flow path 101 guides the hydraulic oil sucked from the outside to the low pressure chamber 43 (see FIG. 2), and the discharge flow path 102 guides the hydraulic oil discharged from the high pressure chamber 44 (see FIG. 2) to the outside.
  • the suction flow path 101 and the discharge flow path 102 are formed in a straight line so as to penetrate the rear cover 104R.
  • the front cover 104F has a through hole 41a through which one end of the rotating shaft 11 (right end in the drawing) penetrates, and a recess 41b in which one end (right end in the drawing) of the rotating shaft 15 is housed. , Is formed.
  • the rear cover 104R is formed with a recess 42a in which the other end of the rotating shaft 11 (left end in the drawing) is housed and a recess 42b in which the other end of the rotating shaft 15 (left end in the drawing) is housed.
  • the rotating shaft 11 that rotates integrally with the drive gear 2 is rotatably supported by the covers 104F and 104R via bearings 13a and 14a. That is, the rotating shaft 11 rotates with respect to each case member (cover 104F, 104R, body 104B).
  • One end of the rotating shaft 11 extends to the outside of the case 4 and is connected to a power source (not shown) such as an electric motor.
  • the rotating shaft 15 that rotates integrally with the driven gear 3 is rotatably supported by the covers 104F and 104R via bearings 13b and 14b. That is, the rotating shaft 15 rotates with respect to each case member (covers 104F, 104R, body 104B).
  • the rotating shaft 11 and the rotating shaft 15 are parallel to each other, and hereinafter, the direction along the central axis of the rotating shaft 11 is also referred to as an axial direction.
  • An oil seal 35 is provided at one end of the through hole 41a of the front cover 104F.
  • the oil seal 35 seals between the rotating shaft 11 and the through hole 41a to prevent hydraulic oil from leaking from the inside of the case 4 to the outside.
  • An annular convex portion 21 is provided between the bearing 13a and the oil seal 35 so as to protrude inward in the radial direction from the surface supporting the bearing 13a in the through hole 41a.
  • the convex portion 21 is provided so that its side surface faces one end surface of the bearing 13a in the axial direction. Therefore, in the assembly process of the gear pump 1, the bearing 13a can be easily positioned by bringing the bearing 13a into contact with the convex portion 21.
  • the drive gear 2 is rotationally driven by an external power source in the rotational direction indicated by the arrow A1.
  • the driven gear 3 is driven by the drive gear 2 by engaging with the drive gear 2, and rotates in the rotation direction indicated by the arrow A2 (that is, in the direction opposite to the rotation direction of the drive gear 2).
  • the volume of the space between the teeth changes due to the engagement of the drive gear 2 and the driven gear 3.
  • the hydraulic oil is sucked between the drive gear 2 and the driven gear 3 from the deepest meshing position to the disengagement, and the hydraulic oil is pressurized from the start of meshing to the deepest meshing position. It is discharged.
  • side plates 36 and 37 are interposed between both end faces of the drive gear 2 and the driven gear 3 and the covers 104F and 104R.
  • An annular oil seal 39 is interposed between both end faces of the body 104B and the covers 104F and 104R, and the gear chambers 7 and 8 are sealed by the oil seal 39.
  • a seal member 38 is interposed between the front cover 104F and the side plate 36, and between the rear cover 104R and the side plate 37, respectively.
  • the seal member 38 divides the inner region of the annular oil seal 39 into a low pressure region and a high pressure region, and prevents pressure release from the high pressure region to the low pressure region.
  • the rear cover 104R has a substantially rectangular parallelepiped shape.
  • the rear cover 104R is a suction side connection portion in which a main body portion 140 having recesses 42a and 42b in which the ends of the rotating shafts 11 and 15 are housed and an external pipe (not shown) for guiding hydraulic oil to the suction flow path 101 are connected. It has 151, a discharge side connection portion 152 to which an external pipe (not shown) to which hydraulic oil is guided from the discharge flow path 102 is connected, and ribs (connecting rib 153, outer peripheral rib 159) protruding from the main body portion 140. ..
  • the outer peripheral rib 159 is formed along the outer circumference of the rear cover 104R so as to exhibit a rectangular frame shape when the rear cover 104R is viewed from the front.
  • the suction side connection portion 151 has a substantially cylindrical shape, and is formed so that a part thereof is integrated with the outer peripheral rib 159.
  • the discharge side connection portion 152 has a substantially cylindrical shape, and is formed so that a part thereof is integrated with the outer peripheral rib 159.
  • the outer diameter of the suction side connection portion 151 is larger than the outer diameter of the discharge side connection portion 152.
  • the suction side connection portion 151 has a function as a suction flow path forming portion that forms a part of the suction flow path 101, and the opening surface 101a of the suction flow path 101 is arranged on the end surface thereof.
  • the opening surface 101a corresponds to a flow path cross section (a cross section orthogonal to the hydraulic oil flow direction) at the end of the suction flow path 101 formed on the suction side connection portion 151 on the hydraulic oil inlet side.
  • the discharge side connection portion 152 has a function as a discharge flow path forming portion that forms a part of the discharge flow path 102, and the opening surface 102a of the discharge flow path 102 is arranged on the end surface thereof.
  • the opening surface 102a corresponds to a flow path cross section (a cross section orthogonal to the hydraulic oil flow direction) at the end of the discharge flow path 102 formed on the discharge side connection portion 152 on the hydraulic oil outlet side.
  • a female screw screwed with a male screw formed in a joint of an external pipe is formed on the inner peripheral surface of the suction flow path 101.
  • a female screw screwed with a male screw formed in a joint of an external pipe is formed on the inner peripheral surface of the discharge flow path 102. That is, the joint of the external pipe is screwed to the suction side connection portion 151 and the discharge side connection portion 152.
  • the main body 140 has a surface that abuts on the body 104B (hereinafter, referred to as a first surface 141) and a first surface 141 so as to be parallel to the first surface 141. It has a surface provided on the opposite side (hereinafter referred to as a second surface 142).
  • the first surface 141 and the second surface 142 are provided so as to be orthogonal to the central axis of the rotation axis 11.
  • the second surface 142 has an outer peripheral rib 159, a substantially cylindrical bolt attachment portion 155 to which a bolt is attached, a suction side connection portion 151, a discharge side connection portion 152, and a connection rib 153. It is the surface surrounded by. That is, the second surface 142 corresponds to the bottom surface of the recess 143 formed by the outer peripheral rib 159, the bolt mounting portion 155, the suction side connecting portion 151, the discharging side connecting portion 152, and the connecting rib 153.
  • the bottom surface 142b of the recess 144 forms a part of the second surface 142.
  • the second surface 142 continuously provided on the connecting rib 153 will be referred to as a reference surface 142a, and the height of the ribs 153, 159 and the like will be described as the height (axial length) from the reference surface 142a. ..
  • the recess 144 that is recessed from the reference surface 142a is provided, but the recess 144 may be omitted. That is, the reference surface 142a and the bottom surface 142b of the recess 144 may be flush with each other. Further, a recess may be further provided on the bottom surface 142b of the recess 144.
  • the outer peripheral rib 159, the suction side connection portion 151, the discharge side connection portion 152, and the connection rib 153 project axially from the second surface 142 of the main body portion 140 of the rear cover 104R. It is provided in.
  • the opening surface 101a of the suction flow path 101 and the opening surface 102a of the discharge flow path 102 are parallel to the second surface 142 and in the same direction (FIG. 4). It is provided so as to face upward).
  • the external pipe can be connected to the suction side connection portion 151 and the discharge side connection portion 152 from one side of the gear pump 1.
  • the connecting rib 153 is connected to a portion extending from the second surface 142 of the suction side connection portion 151 toward the opening surface 101a of the suction flow path 101 and the discharge side connection. It is formed so as to connect a portion of the portion 152 extending from the second surface 142 toward the discharge flow path 102.
  • the connecting rib 153 is provided linearly in a direction (horizontal direction in the drawing) orthogonal to the axial direction and the arrangement direction (vertical direction in the drawing) of the pair of gears 2 and 3, and its width W (gear). The lengths of a few in the arrangement direction) are smaller than the outer diameter of the discharge side connection portion 152.
  • the width W of the connecting rib 153 is smaller than the inner diameter of the circular opening surface 102a of the discharge flow path 102 in the discharge side connection portion 152.
  • the connecting rib 153 has a center of the suction side connection portion 151 (the center of the circular opening surface 101a of the suction flow path 101) and a center of the discharge side connection portion 152 (the center of the circular opening surface 102a of the discharge flow path 102). It is provided so as to be parallel to the straight line connecting the center) and. In the present embodiment, the connecting rib 153 is provided on a straight line connecting the center of the suction side connection portion 151 and the center of the discharge side connection portion 152.
  • the suction side connection portion 151 and the discharge side connection portion 152 are connected by the connecting rib 153, the suction side connection portion 151 and the discharge side connection portion 152 are connected in addition to the connection rib 153.
  • the rigidity of the rear cover 104R forming a part of the case 4 is improved as compared with the case where the suction side connection portion 151 and the discharge side connection portion 152 are not connected by the connecting rib 153, and the second surface of the rear cover 104R is improved.
  • the deformation of 142 can be suppressed. It was confirmed by simulation analysis that the deformation of the rear cover 104R was suppressed by connecting the suction side connection portion 151 and the discharge side connection portion 152 by the connecting rib 153.
  • the weight of the rear cover 104R will increase. Further, when the rear cover 104R is manufactured by aluminum die casting in order to reduce the manufacturing cost of the rear cover 104R, there is also a problem that the thicker the rear cover 104R is, the more easily cavities are generated.
  • the rigidity of the rear cover 104R can be effectively improved without increasing the thickness of the entire rear cover 104R, so that the weight of the rear cover 104R can be reduced. Therefore, according to the present embodiment, it is possible to suppress the generation of noise by increasing the rigidity of the rear cover 104R and suppressing the deformation of the second surface 142 while suppressing the increase in the weight of the gear pump 1. Further, when the rear cover 104R is manufactured by aluminum die casting, the occurrence of cavities can be suppressed.
  • the axial end surface of the suction side connection portion 151, the axial end surface of the discharge side connection portion 152, and the axial end surface of the connecting rib 153 are flush with each other. It is formed like this.
  • the connecting rib 153 (the axial length from the reference surface 142a) is higher than the height of the suction side connection portion 151 and the discharge side connection portion 152 (the axial length from the reference surface 142a)
  • the tip of the connecting rib 153 serves as a protrusion in the gear pump 1.
  • the connecting rib 153 may interfere with the surrounding structure and hinder the attachment of the gear pump 1.
  • the height of the connecting rib 153 is the same as the height of the suction side connection portion 151 and the discharge side connection portion 152, so that the mountability to the external device is improved. Can be done.
  • the height of the connecting rib 153 may be lower than the height of the suction side connecting portion 151 and the discharging side connecting portion 152. Also in this case, the mountability of the gear pump 1 to the external device can be improved.
  • the suction side connection portion 151 and the discharge side connection portion 152 are provided so as to protrude from the main body portion 140 of the rear cover 104R, and the suction side connection portion 151 and the discharge side connection portion 152 are connected by the connecting rib 153.
  • the suction side connection portion 151 and the discharge side connection portion 152 can be used as strength members. Therefore, the rigidity of the rear cover 104R forming a part of the case 4 can be improved by the connecting rib 153, the suction side connection portion 151, and the discharge side connection portion 152, and the rear cover 104R caused by the pulsation of the discharge pressure of the gear pump 1 can be improved. Deformation of the main body 140 can be suppressed. As a result, according to the present embodiment, it is possible to suppress the generation of noise by increasing the rigidity of the rear cover 104R while suppressing the increase in the weight of the gear pump 1.
  • the suction flow path 101 and the discharge flow path 102 are provided in a straight line, and the opening surface 101a of the suction flow path 101 in the suction side connection portion 151 and the opening of the discharge flow path 102 in the discharge side connection portion 152.
  • the surfaces 102a were provided so as to be parallel to the second surface 142 and to face each other in the same direction (see FIGS. 3 and 4).
  • the suction flow path 201 and the discharge flow path 202 are provided so as to be bent by 90 degrees (see FIG. 8), and the opening surface 201a and the opening surface 201a of the suction flow path 201 in the suction side connection portion 251 are provided.
  • the opening surfaces 202a of the discharge flow path 202 in the discharge side connection portion 252 are provided so as to be orthogonal to the second surface 142 and to face in opposite directions to each other (see FIGS. 5 and 8).
  • the suction side connection portion 251 and the discharge side connection portion 252 and the connection rib 253 will be described in detail.
  • the suction side connection portion 251 and the discharge side connection portion 252 have substantially the same shape and are arranged so as to be symmetrical.
  • the suction side connection portion 251 has a function as a suction flow path forming portion forming a part of the suction flow path 201
  • the discharge side connection portion 252 is a part of the discharge flow path 202. It has a function as a discharge flow path forming portion for forming the above.
  • the tip of the suction side connection portion 251 protrudes from the main body portion 140 in one of the directions orthogonal to the axial direction (left direction in the drawing).
  • the suction side connection portion 251 has an opening surface 201a of the suction flow path 201 arranged on the tip surface 251a thereof.
  • the opening surface 201a corresponds to a flow path cross section (a cross section orthogonal to the hydraulic oil flow direction) at the end of the suction flow path 201 formed on the suction side connection portion 251 on the hydraulic oil inlet side.
  • the tip of the discharge side connection portion 252 projects from the main body portion 140 in the other direction (right direction in the drawing) perpendicular to the axial direction.
  • the discharge side connection portion 252 has an opening surface 202a of the discharge flow path 202 arranged on the tip surface 252a thereof.
  • the opening surface 202a corresponds to a flow path cross section (a cross section orthogonal to the hydraulic oil flow direction) at the end of the discharge flow path 202 formed on the discharge side connection portion 252 on the hydraulic oil outlet side.
  • the discharge side connection portion 252 is fastened by screwing the joint of the external pipe into the opening of the discharge flow path 202.
  • the female screw is formed on the inner circumference of the suction flow path 101, but in the second embodiment, the female screw is not formed on the inner circumference of the suction flow path 201.
  • the suction side connection portion 251 has four screw holes 251h formed around the opening surface 201a of the suction flow path 201.
  • the external pipe is connected to the suction side connection portion 251 by inserting a bolt into the through hole of the flange of the external pipe and screwing the tip of the bolt into the screw hole 251h provided in the suction side connection portion 251. Be connected.
  • the suction side connection portion 251 and the discharge side connection portion 252 are formed so as to project in the left-right direction in FIG. Further, as shown in FIG. 7, a part of the suction side connection portion 251 and the discharge side connection portion 252 also protrudes from the second surface 142.
  • the suction side connection portion 251 is provided with a base end portion 251b on the central side of the rear cover 204R in the left-right direction in the drawing, and is provided from the base end portion 251b toward the tip surface 251a from the second surface 142.
  • the height of the is gradually increased.
  • the suction side connecting portion 251 is formed so that the height from the reference surface 142a gradually decreases from the central portion in the vertical direction shown in the drawing upward and downward.
  • the discharge side connection portion 252 is provided with a base end portion 252b on the central side of the rear cover 204R in the left-right direction in the drawing, and the height from the second surface 142 gradually increases from the base end portion 252b toward the tip end surface 252a. It is formed to be. Further, the discharge side connecting portion 252 is formed so that the height from the reference surface 142a gradually decreases from the central portion in the vertical direction shown in the drawing upward and downward.
  • the connecting rib 253 is provided so as to connect the base end portion 251b of the suction side connection portion 251 and the base end portion 252b of the discharge side connection portion 252. That is, the connecting rib 253 includes a portion of the suction side connection portion 251 opposite to the opening surface 201a of the suction flow path 201 and a portion of the discharge side connection portion 252 opposite to the opening surface 202a of the discharge flow path 202. , Are connected.
  • a part of the discharge side connecting portion 252 projects from the reference surface 142a, and the connecting rib 253 is connected to this protruding portion. Therefore, in addition to the connecting rib 253, the protruding portion of the discharge side connecting portion 252 can function as a reinforcing portion (strength member) that suppresses deformation of the second surface 142.
  • the height H2 of the connecting rib 253 (axial length from the reference surface 142a) is higher than the height H1 of the outer peripheral rib 159 (axial length from the reference surface 142a), and the suction is performed. It is lower than the height H3 of the side connecting portion 251 (the axial length from the reference surface 142a). Further, the height H2 of the connecting rib 253 (the axial length from the reference surface 142a) is lower than the height of the discharge side connecting portion 252 (the axial length from the reference surface 142a). Since the connecting rib 253 does not protrude from the suction side connection portion 251 and the discharge side connection portion 252, the mountability of the gear pump 1 to the external device can be improved.
  • the rigidity of the rear cover 204R can be improved as in the first embodiment, and the deformation of the main body 140 of the rear cover 204R due to the pulsation of the discharge pressure of the gear pump 1 can be suppressed. can do.
  • a reinforcing rib 254 extending in the vertical direction from the left and right central portions of the connecting rib 253 is provided.
  • the reinforcing rib 254 is provided so as to be orthogonal to the connecting rib 253, and connects the connecting rib 253 and the outer peripheral rib 159.
  • the rigidity of the rear cover 204R can be further increased.
  • ⁇ Modification example 1> In the first embodiment described above, an example of forming one connecting rib 153 that connects the suction side connecting portion 151 and the discharging side connecting portion 152 has been described, but the present invention is not limited thereto. As shown in FIG. 9, two connecting ribs 153 connecting the suction side connection portion 151 and the discharge side connection portion 152 may be formed. Further, although not shown, three or more connecting ribs 153 may be formed.
  • ⁇ Modification 2> In the above embodiment, an example in which the front cover 104F and the rear cover 104R are fastened to the body 104B has been described, but the present invention is not limited thereto.
  • one of the front cover 104F and the rear cover 104R and the body 104B may be integrally formed.
  • the body 104B has a bottomed tubular shape with one end open and the other end at the bottom.
  • the gear pump 1 has been described as an example of the hydraulic rotary machine, but the present invention is not limited thereto.
  • the present invention can also be applied when another pump such as a piston pump or a vane pump is adopted as the hydraulic rotary machine.
  • a motor such as a gear motor, a piston motor, or a vane motor is adopted as a hydraulic rotary machine, and the discharge side connection portion and the suction side connection portion of the motor are connected by ribs. May be good.
  • the hydraulic rotary machine (gear pump 1) includes a case member (rear cover 104R, 204R) and a rotating shaft 11 that rotates with respect to the case member (rear cover 104R, 204R), and the case member (rear cover 104R, 204R) includes a case member (rear cover 104R, 204R).
  • the suction flow path forming portion (suction side connection portion 151,251) protruding from the main body portion 140 and forming a part of the suction flow paths 101 and 201, and the discharge flow path 102 protruding from the main body portion 140.
  • discharge flow path forming part discharge side connection part 152, 252
  • suction flow path forming part suction side connection part 151, 251
  • discharge flow path forming part protruding from the main body 140 It has ribs (connecting ribs 153, 253) for connecting (discharging side connecting portions 152, 252).
  • the suction flow path forming portion (suction side connection portion 151,251) and the discharge flow path forming portion (discharge side connection portion 152,252) are connected by ribs (connecting ribs 153, 253) to suck in.
  • the rib (connecting rib 153,253) and the suction flow path forming part The rigidity of the case members (rear covers 104R and 204R) can be improved by the suction side connection portions 151 and 251) and the discharge flow path forming portions (discharge side connection portions 152 and 252). As a result, it is possible to suppress the generation of noise while suppressing the increase in the weight of the hydraulic rotary machine (gear pump 1).
  • the hydraulic rotary machine (gear pump 1) includes a tubular body 104B, the case member is a cover (rear cover 104R, 204R) that closes the opening of the body 104B, and the cover (rear cover 104R, 204R) is the body 104B.
  • a main body portion 140 having a first surface 141 abutting on the first surface 141 and a second surface 142 provided on the opposite side of the first surface 141, and a suction flow path forming portion protruding from the second surface 142 ( Suction side connection parts 151,251), discharge flow path forming parts (discharge side connection parts 152, 252) protruding from the second surface 142, and ribs protruding from the second surface 142 (connecting ribs 153, 253). And have.
  • the hydraulic rotary machine (gear pump 1) has an opening surface 101a of the suction flow path 101 in the suction flow path forming portion (suction side connection portion 151) and a discharge flow path 102 in the discharge flow path forming portion (discharge side connection portion 152).
  • the opening surfaces 102a are provided so as to be parallel to the second surface 142 and to face each other in the same direction, and ribs (connecting ribs 153) are provided to form a suction flow path (suction side connecting portion 151).
  • a portion extending toward 102a is connected.
  • the hydraulic rotary machine (gear pump 1) has an opening surface 201a of the suction flow path 201 in the suction flow path forming portion (suction side connection portion 251) and a discharge flow path 202 in the discharge flow path forming portion (discharge side connection portion 252).
  • the opening surfaces 202a are provided so as to be orthogonal to the second surface 142 and to face in opposite directions, and ribs (connecting ribs 253) are provided to form a suction flow path (suction side connecting portion 251).
  • the portion of the suction flow path 201 opposite to the opening surface 201a and the portion of the discharge flow path forming portion (discharge side connection portion 252) opposite to the opening surface 202a of the discharge flow path 202 are connected.
  • the suction flow path forming portions (suction side connection portions 151 and 251) and the discharge flow path forming portions (discharge side connection portions 152 and 252) provided on the cover (rear covers 104R and 204R) are ribbed (connecting ribs). By connecting with 153,253), the rigidity of the cover (rear cover 104R, 204R) can be improved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Abstract

A hydraulic rotary machine (1) is provided with a case member (104R), and a rotating shaft (11) which rotates relative to the case member (104R), wherein the case member (104R) comprises: a main body portion (140); an intake flow passage forming portion (151) which projects from the main body portion (140) and which forms a portion of an intake flow passage (101); a discharge flow passage forming portion (152) which projects from the main body portion (140) and which forms a portion of a discharge flow passage (102); and a rib (153) which projects from the main body portion (140) and which links the intake flow passage forming portion (151) and the discharge flow passage forming portion (152).

Description

液圧回転機Hydraulic rotary machine
　本発明は、液圧回転機に関する。 The present invention relates to a hydraulic rotary machine.
　ボディに収容された一対のギアを備えるギアポンプが知られている（ＪＰＨ６－１４７１３６Ａ参照）。特許文献１に記載のギアポンプは、一対のギアが組み込まれたボディと、ボディの一方の開口端面を閉塞するマウンティングフランジと、ボディの他方の開口端面を閉塞するカバーと、を備える。カバーには、吸込ポートと吐出ポートとが形成される。 A gear pump having a pair of gears housed in the body is known (see JPH6-1471136A). The gear pump described in Patent Document 1 includes a body incorporating a pair of gears, a mounting flange that closes one open end face of the body, and a cover that closes the other open end face of the body. A suction port and a discharge port are formed on the cover.
　吐出圧の高圧化が進むと、カバーにおける吐出ポートの周囲が微小な変形を繰り返すことにより、騒音が発生するおそれがある。騒音を抑制するためには、カバーの剛性を向上させることが効果的であるが、カバー全体の厚みを増やすと、カバーの重量が増加するという問題がある。 As the discharge pressure increases, noise may be generated due to repeated minute deformation around the discharge port on the cover. In order to suppress noise, it is effective to improve the rigidity of the cover, but there is a problem that the weight of the cover increases when the thickness of the entire cover is increased.
　本発明は、液圧回転機の重量の増加を抑えつつ、騒音の発生を抑制することを目的とする。 An object of the present invention is to suppress the generation of noise while suppressing the increase in the weight of the hydraulic rotary machine.
　本発明のある態様によれば、液圧回転機であって、ケース部材と、前記ケース部材に対して回転する回転軸と、を備え、前記ケース部材は、本体部と、前記本体部から突出し、吸込流路の一部を形成する吸込流路形成部と、前記本体部から突出し、吐出流路の一部を形成する吐出流路形成部と、前記本体部から突出し、前記吸込流路形成部と前記吐出流路形成部とを連結するリブと、を有する。 According to an aspect of the present invention, the hydraulic rotary machine includes a case member and a rotating shaft that rotates with respect to the case member, and the case member protrudes from the main body portion and the main body portion. , A suction flow path forming portion that forms a part of the suction flow path, a discharge flow path forming portion that protrudes from the main body portion and forms a part of the discharge flow path, and a suction flow path forming portion that protrudes from the main body portion and forms the suction flow path. It has a rib that connects the portion and the discharge flow path forming portion.
図１は本発明の第１実施形態に係るギアポンプを示す縦断面図である。FIG. 1 is a vertical sectional view showing a gear pump according to the first embodiment of the present invention. 図２は一対のギアを示す断面図である。FIG. 2 is a cross-sectional view showing a pair of gears. 図３は図１のギアポンプのリアカバーの正面図である。FIG. 3 is a front view of the rear cover of the gear pump of FIG. 図４は図３のＩＶ－ＩＶ線に沿う断面図である。FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 図５は本発明の第２実施形態に係るギアポンプのリアカバーの正面図である。FIG. 5 is a front view of the rear cover of the gear pump according to the second embodiment of the present invention. 図６は図５のＩＶ方向から見たリアカバーの側面図である。FIG. 6 is a side view of the rear cover as viewed from the IV direction of FIG. 図７は図５のＶＩＩ－ＶＩＩ線に沿う断面図である。FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. 図８は図５のＶＩＩＩ－ＶＩＩＩ線に沿う断面図である。FIG. 8 is a cross-sectional view taken along the line VIII-VIII of FIG. 図９は本発明の第１実施形態の変形例に係るギアポンプのリアカバーの正面図である。FIG. 9 is a front view of the rear cover of the gear pump according to the modified example of the first embodiment of the present invention.
　図面を参照して、本発明の実施形態に係る液圧回転機について説明する。液圧回転機は、外部からの動力により回転軸１１が回転することにより、作動流体を吐出可能なポンプとして機能する。また、液圧回転機は、外部から供給される作動流体の流体圧により回転軸１１が回転することにより、回転駆動力を出力可能なモータとしても機能する。なお、液圧回転機は、ポンプとしてのみ機能するものでもよいし、モータとしてのみ機能するものであってもよい。 The hydraulic rotary machine according to the embodiment of the present invention will be described with reference to the drawings. The hydraulic rotary machine functions as a pump capable of discharging a working fluid by rotating the rotating shaft 11 by an external power. Further, the hydraulic rotary machine also functions as a motor capable of outputting a rotational driving force by rotating the rotating shaft 11 by the fluid pressure of the working fluid supplied from the outside. The hydraulic rotary machine may function only as a pump or may function only as a motor.
　本実施形態では、液圧回転機がギアポンプである場合について例示する。 In this embodiment, a case where the hydraulic rotary machine is a gear pump is illustrated.
　＜第１実施形態＞
　図１～図４を参照して、本発明の第１実施形態に係るギアポンプ１について説明する。ギアポンプ１は、一対のギア（作動部）が噛み合いながら回転して作動流体としての作動油を吐出する。図１に示すように、ギアポンプ１は、一対のギアとしてのドライブギア２及びドリブンギア３と、ドライブギア２及びドリブンギア３を収容するケース４と、を備える。 <First Embodiment>
The gear pump 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 4. The gear pump 1 rotates while a pair of gears (acting portions) are engaged with each other to discharge hydraulic oil as a hydraulic fluid. As shown in FIG. 1, the gear pump 1 includes a drive gear 2 and a driven gear 3 as a pair of gears, and a case 4 accommodating the drive gear 2 and the driven gear 3.
　ドライブギア２には回転軸１１が結合され、ドリブンギア３には回転軸１５が結合される。なお、回転軸１１は、ドライブギア２と一体回転可能に設けられていればよく、ドライブギア２とは別体としてドライブギア２に連結してもよいし、ドライブギア２と一体に成形して一部品としてもよい。同様に、回転軸１５は、ドリブンギア３と一体回転可能に設けられていればよく、ドリブンギア３とは別体としてドリブンギア３に連結してもよいし、ドリブンギア３と一体に成形して一部品としてもよい。 The rotary shaft 11 is coupled to the drive gear 2, and the rotary shaft 15 is coupled to the driven gear 3. The rotary shaft 11 may be provided so as to be rotatable integrally with the drive gear 2, and may be connected to the drive gear 2 separately from the drive gear 2, or may be integrally molded with the drive gear 2. It may be a single part. Similarly, the rotating shaft 15 may be provided so as to be integrally rotatable with the driven gear 3, and may be connected to the driven gear 3 separately from the driven gear 3, or may be integrally formed with the driven gear 3. It may be a single part.
　ケース４は、両端が開口する筒状のボディ１０４Ｂと、ボディ１０４Ｂを挟むように配置される一対のカバー（フロントカバー１０４Ｆ及びリアカバー１０４Ｒ）と、を備える。つまり、ボディ１０４Ｂ、フロントカバー１０４Ｆ及びリアカバー１０４Ｒは、ケース４の一部を構成するケース部材である。ボディ１０４Ｂの両端の開口を一対のカバー（フロントカバー１０４Ｆ及びリアカバー１０４Ｒ）が閉塞することにより、ケース４の内部に作動流体室（空間）が形成される。フロントカバー１０４Ｆ及びリアカバー１０４Ｒは、ボルト等の締結部材によって締結される。なお、フロントカバー１０４Ｆは、ギアポンプ１の取付対象となる外部機器に、支持部材（不図示）を介して取り付けられる。つまり、フロントカバー１０４Ｆは、マウンティングフランジとして機能する。 The case 4 includes a tubular body 104B having both ends open, and a pair of covers (front cover 104F and rear cover 104R) arranged so as to sandwich the body 104B. That is, the body 104B, the front cover 104F, and the rear cover 104R are case members that form a part of the case 4. A pair of covers (front cover 104F and rear cover 104R) close the openings at both ends of the body 104B to form a working fluid chamber (space) inside the case 4. The front cover 104F and the rear cover 104R are fastened by a fastening member such as a bolt. The front cover 104F is attached to an external device to which the gear pump 1 is attached via a support member (not shown). That is, the front cover 104F functions as a mounting flange.
　ボディ１０４Ｂは、ドライブギア２及びドリブンギア３がそれぞれ組み込まれる一対のギア室７，８を有する。図２に示すように、ボディ１０４Ｂにおけるギア室７，８の低圧側には低圧室４３が形成され、ボディ１０４Ｂにおけるギア室７，８の高圧側には高圧室４４が形成される。低圧室４３及び高圧室４４は、ドライブギア２とドリブンギア３のギア噛み合い部２３を挟むようにして形成される。 The body 104B has a pair of gear chambers 7 and 8 in which the drive gear 2 and the driven gear 3 are incorporated, respectively. As shown in FIG. 2, a low pressure chamber 43 is formed on the low pressure side of the gear chambers 7 and 8 in the body 104B, and a high pressure chamber 44 is formed on the high pressure side of the gear chambers 7 and 8 in the body 104B. The low pressure chamber 43 and the high pressure chamber 44 are formed so as to sandwich the gear meshing portion 23 of the drive gear 2 and the driven gear 3.
　図３及び図４に示すように、リアカバー１０４Ｒには、ボディ１０４Ｂに形成される低圧室４３（図２参照）に連通する吸込流路１０１と、ボディ１０４Ｂに形成される高圧室４４（図２参照）に連通する吐出流路１０２と、が形成される。吸込流路１０１は、外部から吸い込まれる作動油を低圧室４３（図２参照）へ導き、吐出流路１０２は、高圧室４４（図２参照）から吐出される作動油を外部へ導く。本実施形態では、吸込流路１０１及び吐出流路１０２は、リアカバー１０４Ｒを貫通するように、直線状に形成される。 As shown in FIGS. 3 and 4, the rear cover 104R has a suction flow path 101 communicating with the low pressure chamber 43 (see FIG. 2) formed in the body 104B and a high pressure chamber 44 (FIG. 2) formed in the body 104B. A discharge flow path 102 communicating with (see) is formed. The suction flow path 101 guides the hydraulic oil sucked from the outside to the low pressure chamber 43 (see FIG. 2), and the discharge flow path 102 guides the hydraulic oil discharged from the high pressure chamber 44 (see FIG. 2) to the outside. In the present embodiment, the suction flow path 101 and the discharge flow path 102 are formed in a straight line so as to penetrate the rear cover 104R.
　図１に示すように、フロントカバー１０４Ｆには、回転軸１１の一端部（図示右端部）が貫通する貫通孔４１ａと、回転軸１５の一端部（図示右端部）が収容される凹部４１ｂと、が形成される。リアカバー１０４Ｒには、回転軸１１の他端部（図示左端部）が収容される凹部４２ａと、回転軸１５の他端部（図示左端部）が収容される凹部４２ｂと、が形成される。 As shown in FIG. 1, the front cover 104F has a through hole 41a through which one end of the rotating shaft 11 (right end in the drawing) penetrates, and a recess 41b in which one end (right end in the drawing) of the rotating shaft 15 is housed. , Is formed. The rear cover 104R is formed with a recess 42a in which the other end of the rotating shaft 11 (left end in the drawing) is housed and a recess 42b in which the other end of the rotating shaft 15 (left end in the drawing) is housed.
　ドライブギア２と一体に回転する回転軸１１は、軸受１３ａ，１４ａを介してカバー１０４Ｆ，１０４Ｒに回転自在に支持される。つまり、回転軸１１は、各ケース部材（カバー１０４Ｆ，１０４Ｒ、ボディ１０４Ｂ）に対して回転する。回転軸１１の一端部は、ケース４の外部へと延在し、電動モータ等の動力源（不図示）に連結される。ドリブンギア３と一体に回転する回転軸１５は、軸受１３ｂ，１４ｂを介してカバー１０４Ｆ，１０４Ｒに回転自在に支持される。つまり、回転軸１５は、各ケース部材（カバー１０４Ｆ，１０４Ｒ、ボディ１０４Ｂ）に対して回転する。回転軸１１及び回転軸１５は、互いに平行であり、以下、回転軸１１の中心軸に沿う方向を軸方向とも記す。 The rotating shaft 11 that rotates integrally with the drive gear 2 is rotatably supported by the covers 104F and 104R via bearings 13a and 14a. That is, the rotating shaft 11 rotates with respect to each case member ( cover 104F, 104R, body 104B). One end of the rotating shaft 11 extends to the outside of the case 4 and is connected to a power source (not shown) such as an electric motor. The rotating shaft 15 that rotates integrally with the driven gear 3 is rotatably supported by the covers 104F and 104R via bearings 13b and 14b. That is, the rotating shaft 15 rotates with respect to each case member (covers 104F, 104R, body 104B). The rotating shaft 11 and the rotating shaft 15 are parallel to each other, and hereinafter, the direction along the central axis of the rotating shaft 11 is also referred to as an axial direction.
　フロントカバー１０４Ｆの貫通孔４１ａの一端部には、オイルシール３５が設けられる。オイルシール３５は、回転軸１１と貫通孔４１ａとの間を封止し、ケース４内から外部に作動油が漏れ出ることを防止する。軸受１３ａとオイルシール３５との間には、貫通孔４１ａにおいて軸受１３ａを支持する面から径方向内方に向かって突出する環状の凸部２１が設けられる。凸部２１は、その側面が軸受１３ａの一端面に軸方向で対向するように設けられる。このため、ギアポンプ１の組立工程において、軸受１３ａを凸部２１に当接させることにより、軸受１３ａを容易に位置決めすることができる。 An oil seal 35 is provided at one end of the through hole 41a of the front cover 104F. The oil seal 35 seals between the rotating shaft 11 and the through hole 41a to prevent hydraulic oil from leaking from the inside of the case 4 to the outside. An annular convex portion 21 is provided between the bearing 13a and the oil seal 35 so as to protrude inward in the radial direction from the surface supporting the bearing 13a in the through hole 41a. The convex portion 21 is provided so that its side surface faces one end surface of the bearing 13a in the axial direction. Therefore, in the assembly process of the gear pump 1, the bearing 13a can be easily positioned by bringing the bearing 13a into contact with the convex portion 21.
　図２に示すように、ドライブギア２は、外部の動力源によって矢印Ａ１で示す回転方向に回転駆動される。ドリブンギア３は、ドライブギア２と噛み合うことによってドライブギア２に従動し、矢印Ａ２で示す回転方向（すなわちドライブギア２の回転方向とは反対の方向）に回転する。 As shown in FIG. 2, the drive gear 2 is rotationally driven by an external power source in the rotational direction indicated by the arrow A1. The driven gear 3 is driven by the drive gear 2 by engaging with the drive gear 2, and rotates in the rotation direction indicated by the arrow A2 (that is, in the direction opposite to the rotation direction of the drive gear 2).
　ドライブギア２及びドリブンギア３が噛み合うことにより、歯部間の空間の容積が変化する。ドライブギア２とドリブンギア３との間で、最も深く噛み合う位置から噛み合いが解除されるまでの間に作動油が吸い込まれ、噛み合い開始から最も深く噛み合う位置までの間に作動油が加圧され、吐出される。 The volume of the space between the teeth changes due to the engagement of the drive gear 2 and the driven gear 3. The hydraulic oil is sucked between the drive gear 2 and the driven gear 3 from the deepest meshing position to the disengagement, and the hydraulic oil is pressurized from the start of meshing to the deepest meshing position. It is discharged.
　したがって、ギア室７，８にてドライブギア２とドリブンギア３とが噛み合いながら回転することによって、外部から吸込流路１０１（図３、図４参照）を通じて低圧室４３に作動油が吸い込まれ、低圧室４３に吸い込まれた作動油は、ギア室７，８のそれぞれの内周面に沿って運ばれ、高圧室４４から吐出流路１０２（図３、図４参照）を通じて外部に吐出される。 Therefore, when the drive gear 2 and the driven gear 3 rotate while meshing with each other in the gear chambers 7 and 8, the hydraulic oil is sucked into the low pressure chamber 43 from the outside through the suction flow path 101 (see FIGS. 3 and 4). The hydraulic oil sucked into the low pressure chamber 43 is carried along the inner peripheral surfaces of the gear chambers 7 and 8, and is discharged from the high pressure chamber 44 to the outside through the discharge flow path 102 (see FIGS. 3 and 4). ..
　図１に示すように、ドライブギア２及びドリブンギア３の両端面とカバー１０４Ｆ，１０４Ｒとの間には、サイドプレート３６，３７が介装される。ボディ１０４Ｂの両端面とカバー１０４Ｆ，１０４Ｒとの間のそれぞれには、環状のオイルシール３９が介装され、オイルシール３９によってギア室７，８が密封される。環状のオイルシール３９の内側では、フロントカバー１０４Ｆとサイドプレート３６との間、及び、リアカバー１０４Ｒとサイドプレート３７との間のそれぞれにシール部材３８が介装される。シール部材３８は、環状のオイルシール３９の内側の領域を低圧領域と高圧領域とに区画し、高圧領域から低圧領域への圧抜けを防止する。 As shown in FIG. 1, side plates 36 and 37 are interposed between both end faces of the drive gear 2 and the driven gear 3 and the covers 104F and 104R. An annular oil seal 39 is interposed between both end faces of the body 104B and the covers 104F and 104R, and the gear chambers 7 and 8 are sealed by the oil seal 39. Inside the annular oil seal 39, a seal member 38 is interposed between the front cover 104F and the side plate 36, and between the rear cover 104R and the side plate 37, respectively. The seal member 38 divides the inner region of the annular oil seal 39 into a low pressure region and a high pressure region, and prevents pressure release from the high pressure region to the low pressure region.
　図１、図３及び図４に示すように、リアカバー１０４Ｒは、略直方体形状である。リアカバー１０４Ｒは、回転軸１１，１５の端部が収容される凹部４２ａ，４２ｂを有する本体部１４０と、吸込流路１０１に作動油を導く外部配管（不図示）が接続される吸込側接続部１５１と、吐出流路１０２から作動油が導かれる外部配管（不図示）が接続される吐出側接続部１５２と、本体部１４０から突出するリブ（連結リブ１５３、外周リブ１５９）と、を有する。 As shown in FIGS. 1, 3 and 4, the rear cover 104R has a substantially rectangular parallelepiped shape. The rear cover 104R is a suction side connection portion in which a main body portion 140 having recesses 42a and 42b in which the ends of the rotating shafts 11 and 15 are housed and an external pipe (not shown) for guiding hydraulic oil to the suction flow path 101 are connected. It has 151, a discharge side connection portion 152 to which an external pipe (not shown) to which hydraulic oil is guided from the discharge flow path 102 is connected, and ribs (connecting rib 153, outer peripheral rib 159) protruding from the main body portion 140. ..
　図３及び図４に示すように、外周リブ１５９は、リアカバー１０４Ｒを正面から見たときに、矩形枠状を呈するようにリアカバー１０４Ｒの外周に沿って形成される。吸込側接続部１５１は、略円筒形状であって、一部が外周リブ１５９と一体となるように形成される。吐出側接続部１５２は、略円筒形状であって、一部が外周リブ１５９と一体となるように形成される。吸込側接続部１５１の外径は、吐出側接続部１５２の外径よりも大きい。 As shown in FIGS. 3 and 4, the outer peripheral rib 159 is formed along the outer circumference of the rear cover 104R so as to exhibit a rectangular frame shape when the rear cover 104R is viewed from the front. The suction side connection portion 151 has a substantially cylindrical shape, and is formed so that a part thereof is integrated with the outer peripheral rib 159. The discharge side connection portion 152 has a substantially cylindrical shape, and is formed so that a part thereof is integrated with the outer peripheral rib 159. The outer diameter of the suction side connection portion 151 is larger than the outer diameter of the discharge side connection portion 152.
　吸込側接続部１５１は、吸込流路１０１の一部を形成する吸込流路形成部としての機能を有し、その端面に吸込流路１０１の開口面１０１ａが配置される。開口面１０１ａは、吸込側接続部１５１に形成される吸込流路１０１の作動油入口側の端部における流路断面（作動油の流れ方向に直交する断面）に相当する。吐出側接続部１５２は、吐出流路１０２の一部を形成する吐出流路形成部としての機能を有し、その端面に吐出流路１０２の開口面１０２ａが配置される。開口面１０２ａは、吐出側接続部１５２に形成される吐出流路１０２の作動油出口側の端部における流路断面（作動油の流れ方向に直交する断面）に相当する。 The suction side connection portion 151 has a function as a suction flow path forming portion that forms a part of the suction flow path 101, and the opening surface 101a of the suction flow path 101 is arranged on the end surface thereof. The opening surface 101a corresponds to a flow path cross section (a cross section orthogonal to the hydraulic oil flow direction) at the end of the suction flow path 101 formed on the suction side connection portion 151 on the hydraulic oil inlet side. The discharge side connection portion 152 has a function as a discharge flow path forming portion that forms a part of the discharge flow path 102, and the opening surface 102a of the discharge flow path 102 is arranged on the end surface thereof. The opening surface 102a corresponds to a flow path cross section (a cross section orthogonal to the hydraulic oil flow direction) at the end of the discharge flow path 102 formed on the discharge side connection portion 152 on the hydraulic oil outlet side.
　吸込流路１０１の内周面には、外部配管の継手に形成されるおねじに螺合するめねじが形成される。吐出流路１０２の内周面には、外部配管の継手に形成されるおねじに螺合するめねじが形成される。つまり、吸込側接続部１５１及び吐出側接続部１５２には、外部配管の継手がねじ締結される。 On the inner peripheral surface of the suction flow path 101, a female screw screwed with a male screw formed in a joint of an external pipe is formed. On the inner peripheral surface of the discharge flow path 102, a female screw screwed with a male screw formed in a joint of an external pipe is formed. That is, the joint of the external pipe is screwed to the suction side connection portion 151 and the discharge side connection portion 152.
　図１に示すように、本体部１４０は、ボディ１０４Ｂに当接する面（以下、第１の面１４１と記す）と、第１の面１４１と平行となるように、第１の面１４１とは反対側に設けられる面（以下、第２の面１４２と記す）と、を有する。第１の面１４１及び第２の面１４２は、回転軸１１の中心軸と直交するように設けられる。 As shown in FIG. 1, the main body 140 has a surface that abuts on the body 104B (hereinafter, referred to as a first surface 141) and a first surface 141 so as to be parallel to the first surface 141. It has a surface provided on the opposite side (hereinafter referred to as a second surface 142). The first surface 141 and the second surface 142 are provided so as to be orthogonal to the central axis of the rotation axis 11.
　図３に示すように、第２の面１４２は、外周リブ１５９と、ボルトが取り付けられる略円筒状のボルト取付部１５５と、吸込側接続部１５１と、吐出側接続部１５２と、連結リブ１５３と、で囲まれている面である。つまり、第２の面１４２は、外周リブ１５９、ボルト取付部１５５、吸込側接続部１５１、吐出側接続部１５２及び連結リブ１５３によって形成される凹部１４３の底面に相当する。 As shown in FIG. 3, the second surface 142 has an outer peripheral rib 159, a substantially cylindrical bolt attachment portion 155 to which a bolt is attached, a suction side connection portion 151, a discharge side connection portion 152, and a connection rib 153. It is the surface surrounded by. That is, the second surface 142 corresponds to the bottom surface of the recess 143 formed by the outer peripheral rib 159, the bolt mounting portion 155, the suction side connecting portion 151, the discharging side connecting portion 152, and the connecting rib 153.
　本実施形態では、ボルト取付部１５５に隣接して４つの凹部１４４が形成され、凹部１４４の底面１４２ｂが第２の面１４２の一部を構成している。以下、連結リブ１５３に連続して設けられる第２の面１４２を基準面１４２ａと記し、リブ１５３，１５９等の高さは、この基準面１４２ａからの高さ（軸方向長さ）として説明する。なお、本実施形態では、基準面１４２ａから窪む凹部１４４を設けているが、凹部１４４は省略することもできる。つまり、基準面１４２ａと凹部１４４の底面１４２ｂとは、面一にしてもよい。また、凹部１４４の底面１４２ｂに、さらに凹部を設けてもよい。 In the present embodiment, four recesses 144 are formed adjacent to the bolt mounting portion 155, and the bottom surface 142b of the recess 144 forms a part of the second surface 142. Hereinafter, the second surface 142 continuously provided on the connecting rib 153 will be referred to as a reference surface 142a, and the height of the ribs 153, 159 and the like will be described as the height (axial length) from the reference surface 142a. .. In the present embodiment, the recess 144 that is recessed from the reference surface 142a is provided, but the recess 144 may be omitted. That is, the reference surface 142a and the bottom surface 142b of the recess 144 may be flush with each other. Further, a recess may be further provided on the bottom surface 142b of the recess 144.
　図１及び図３に示すように、外周リブ１５９、吸込側接続部１５１、吐出側接続部１５２及び連結リブ１５３は、リアカバー１０４Ｒの本体部１４０の第２の面１４２から軸方向に突出するように設けられている。 As shown in FIGS. 1 and 3, the outer peripheral rib 159, the suction side connection portion 151, the discharge side connection portion 152, and the connection rib 153 project axially from the second surface 142 of the main body portion 140 of the rear cover 104R. It is provided in.
　図３及び図４に示すように、吸込流路１０１の開口面１０１ａ及び吐出流路１０２の開口面１０２ａは、それぞれ第２の面１４２と平行となるように、かつ、互いに同じ方向（図４において上方向）を向くように設けられる。これにより、ギアポンプ１に対して、外部配管を一方から吸込側接続部１５１及び吐出側接続部１５２に接続することができる。 As shown in FIGS. 3 and 4, the opening surface 101a of the suction flow path 101 and the opening surface 102a of the discharge flow path 102 are parallel to the second surface 142 and in the same direction (FIG. 4). It is provided so as to face upward). As a result, the external pipe can be connected to the suction side connection portion 151 and the discharge side connection portion 152 from one side of the gear pump 1.
　図１、図３及び図４に示すように、連結リブ１５３は、吸込側接続部１５１における第２の面１４２から吸込流路１０１の開口面１０１ａに向かって延在する部位と、吐出側接続部１５２における第２の面１４２から吐出流路１０２に向かって延在する部位と、を連結するように形成される。図３に示すように、連結リブ１５３は、軸方向及び一対のギア２，３の配列方向（図示上下方向）に直交する方向（図示左右方向）に直線状に設けられ、その幅Ｗ（ギア２，３の配列方向の長さ）は、吐出側接続部１５２の外径よりも小さい。本実施形態では、連結リブ１５３の幅Ｗは、吐出側接続部１５２における吐出流路１０２の円形状の開口面１０２ａの内径よりも小さい。 As shown in FIGS. 1, 3 and 4, the connecting rib 153 is connected to a portion extending from the second surface 142 of the suction side connection portion 151 toward the opening surface 101a of the suction flow path 101 and the discharge side connection. It is formed so as to connect a portion of the portion 152 extending from the second surface 142 toward the discharge flow path 102. As shown in FIG. 3, the connecting rib 153 is provided linearly in a direction (horizontal direction in the drawing) orthogonal to the axial direction and the arrangement direction (vertical direction in the drawing) of the pair of gears 2 and 3, and its width W (gear). The lengths of a few in the arrangement direction) are smaller than the outer diameter of the discharge side connection portion 152. In the present embodiment, the width W of the connecting rib 153 is smaller than the inner diameter of the circular opening surface 102a of the discharge flow path 102 in the discharge side connection portion 152.
　また、連結リブ１５３は、吸込側接続部１５１の中心（吸込流路１０１の円形状の開口面１０１ａの中心）と、吐出側接続部１５２の中心（吐出流路１０２の円形状の開口面１０２ａの中心）と、を結ぶ直線と平行となるように設けられる。本実施形態では、連結リブ１５３は、吸込側接続部１５１の中心と、吐出側接続部１５２の中心と、を結ぶ直線上に設けられている。 Further, the connecting rib 153 has a center of the suction side connection portion 151 (the center of the circular opening surface 101a of the suction flow path 101) and a center of the discharge side connection portion 152 (the center of the circular opening surface 102a of the discharge flow path 102). It is provided so as to be parallel to the straight line connecting the center) and. In the present embodiment, the connecting rib 153 is provided on a straight line connecting the center of the suction side connection portion 151 and the center of the discharge side connection portion 152.
　連結リブ１５３が無い場合、ギアポンプ１の吐出圧の高圧化が進むと、吐出圧の脈動に起因して、リアカバー１０４Ｒにおける吐出側接続部１５２の周囲の第２の面１４２が微小な変形を繰り返すことにより、騒音が発生するおそれがある。 In the absence of the connecting rib 153, as the discharge pressure of the gear pump 1 increases, the second surface 142 around the discharge side connection portion 152 of the rear cover 104R repeats minute deformation due to the pulsation of the discharge pressure. As a result, noise may be generated.
　これに対して、本実施形態では、吸込側接続部１５１と吐出側接続部１５２とを連結リブ１５３によって連結しているので、連結リブ１５３に加え、吸込側接続部１５１及び吐出側接続部１５２を本体部１４０に対する補強部（強度メンバ）として利用することができる。その結果、吸込側接続部１５１と吐出側接続部１５２とを連結リブ１５３によって連結しない場合に比べて、ケース４の一部を構成するリアカバー１０４Ｒの剛性を向上し、リアカバー１０４Ｒの第２の面１４２の変形を抑制することができる。なお、吸込側接続部１５１と吐出側接続部１５２とを連結リブ１５３によって連結することにより、リアカバー１０４Ｒの変形が抑制されることは、シミュレーション解析により確認することができた。 On the other hand, in the present embodiment, since the suction side connection portion 151 and the discharge side connection portion 152 are connected by the connecting rib 153, the suction side connection portion 151 and the discharge side connection portion 152 are connected in addition to the connection rib 153. Can be used as a reinforcing portion (strength member) for the main body portion 140. As a result, the rigidity of the rear cover 104R forming a part of the case 4 is improved as compared with the case where the suction side connection portion 151 and the discharge side connection portion 152 are not connected by the connecting rib 153, and the second surface of the rear cover 104R is improved. The deformation of 142 can be suppressed. It was confirmed by simulation analysis that the deformation of the rear cover 104R was suppressed by connecting the suction side connection portion 151 and the discharge side connection portion 152 by the connecting rib 153.
　リアカバー１０４Ｒの剛性を向上するために、リアカバー１０４Ｒの全体の厚みを厚くした場合、リアカバー１０４Ｒの重量が増加してしまう。また、リアカバー１０４Ｒの製造コストを低減するために、アルミダイキャストによりリアカバー１０４Ｒを製造する場合、リアカバー１０４Ｒの厚みが厚いほど、鋳巣が発生しやすいという問題もある。 If the overall thickness of the rear cover 104R is increased in order to improve the rigidity of the rear cover 104R, the weight of the rear cover 104R will increase. Further, when the rear cover 104R is manufactured by aluminum die casting in order to reduce the manufacturing cost of the rear cover 104R, there is also a problem that the thicker the rear cover 104R is, the more easily cavities are generated.
　これに対して、本実施形態では、リアカバー１０４Ｒ全体の厚みを増やすことなく、リアカバー１０４Ｒの剛性を効果的に向上することができるので、リアカバー１０４Ｒの重量の低減を図ることができる。したがって、本実施形態によれば、ギアポンプ１の重量の増加を抑えつつ、リアカバー１０４Ｒの剛性を高め、第２の面１４２の変形を抑制することにより、騒音の発生を抑制することができる。また、アルミダイキャストによりリアカバー１０４Ｒを製造する場合に、鋳巣の発生を抑えることができる。 On the other hand, in the present embodiment, the rigidity of the rear cover 104R can be effectively improved without increasing the thickness of the entire rear cover 104R, so that the weight of the rear cover 104R can be reduced. Therefore, according to the present embodiment, it is possible to suppress the generation of noise by increasing the rigidity of the rear cover 104R and suppressing the deformation of the second surface 142 while suppressing the increase in the weight of the gear pump 1. Further, when the rear cover 104R is manufactured by aluminum die casting, the occurrence of cavities can be suppressed.
　図１及び図４に示すように、リアカバー１０４Ｒは、吸込側接続部１５１の軸方向端面と、吐出側接続部１５２の軸方向端面と、連結リブ１５３の軸方向端面と、が面一となるように形成されている。 As shown in FIGS. 1 and 4, in the rear cover 104R, the axial end surface of the suction side connection portion 151, the axial end surface of the discharge side connection portion 152, and the axial end surface of the connecting rib 153 are flush with each other. It is formed like this.
　連結リブ１５３の高さ（基準面１４２ａからの軸方向長さ）が、吸込側接続部１５１及び吐出側接続部１５２の高さ（基準面１４２ａからの軸方向長さ）に比べて高い場合、連結リブ１５３の先端部がギアポンプ１における出っ張りとなる。この場合、ギアポンプ１を外部機器に取り付ける際に、連結リブ１５３が周囲の構造物と干渉し、ギアポンプ１の取り付けの妨げになるおそれがある。 When the height of the connecting rib 153 (the axial length from the reference surface 142a) is higher than the height of the suction side connection portion 151 and the discharge side connection portion 152 (the axial length from the reference surface 142a) The tip of the connecting rib 153 serves as a protrusion in the gear pump 1. In this case, when the gear pump 1 is attached to an external device, the connecting rib 153 may interfere with the surrounding structure and hinder the attachment of the gear pump 1.
　これに対して、本実施形態では、連結リブ１５３の高さが、吸込側接続部１５１及び吐出側接続部１５２の高さと同じであるため、外部機器への取付性を良好なものとすることができる。なお、連結リブ１５３の高さは、吸込側接続部１５１及び吐出側接続部１５２の高さよりも低くしてもよい。この場合も、外部機器に対するギアポンプ１の取付性を良好なものとすることができる。 On the other hand, in the present embodiment, the height of the connecting rib 153 is the same as the height of the suction side connection portion 151 and the discharge side connection portion 152, so that the mountability to the external device is improved. Can be done. The height of the connecting rib 153 may be lower than the height of the suction side connecting portion 151 and the discharging side connecting portion 152. Also in this case, the mountability of the gear pump 1 to the external device can be improved.
　上述した実施形態によれば、次の作用効果を奏する。 According to the above-described embodiment, the following effects are exhibited.
　吸込側接続部１５１及び吐出側接続部１５２がリアカバー１０４Ｒの本体部１４０から突出するように設けられ、吸込側接続部１５１と吐出側接続部１５２とが連結リブ１５３によって連結される。吸込側接続部１５１と吐出側接続部１５２とを連結リブ１５３によって連結することにより、吸込側接続部１５１及び吐出側接続部１５２を強度メンバとして利用することができる。したがって、連結リブ１５３、吸込側接続部１５１及び吐出側接続部１５２によってケース４の一部を構成するリアカバー１０４Ｒの剛性を向上することができ、ギアポンプ１の吐出圧の脈動に起因するリアカバー１０４Ｒの本体部１４０の変形を抑制することができる。これにより、本実施形態によれば、ギアポンプ１の重量の増加を抑えつつ、リアカバー１０４Ｒの剛性を高めることにより、騒音の発生を抑制することができる。 The suction side connection portion 151 and the discharge side connection portion 152 are provided so as to protrude from the main body portion 140 of the rear cover 104R, and the suction side connection portion 151 and the discharge side connection portion 152 are connected by the connecting rib 153. By connecting the suction side connection portion 151 and the discharge side connection portion 152 by the connecting rib 153, the suction side connection portion 151 and the discharge side connection portion 152 can be used as strength members. Therefore, the rigidity of the rear cover 104R forming a part of the case 4 can be improved by the connecting rib 153, the suction side connection portion 151, and the discharge side connection portion 152, and the rear cover 104R caused by the pulsation of the discharge pressure of the gear pump 1 can be improved. Deformation of the main body 140 can be suppressed. As a result, according to the present embodiment, it is possible to suppress the generation of noise by increasing the rigidity of the rear cover 104R while suppressing the increase in the weight of the gear pump 1.
　＜第２実施形態＞
　図５～図８を参照して、本発明の第２実施形態に係るギアポンプ１のリアカバー２０４Ｒについて説明する。以下では、上記第１実施形態と異なる点を中心に説明し、図中、上記第１実施形態で説明した構成と同一の構成または相当する構成には同一の符号を付して説明を省略する。第２実施形態では、ギアポンプ１の吸込流路２０１に作動油を導く外部配管（不図示）及びギアポンプ１の吐出流路２０２から作動油が導かれる外部配管（不図示）との取り合いの位置が、第１実施形態と異なる。 <Second Embodiment>
The rear cover 204R of the gear pump 1 according to the second embodiment of the present invention will be described with reference to FIGS. 5 to 8. Hereinafter, the points different from those of the first embodiment will be mainly described, and in the drawings, the same configurations as those described in the first embodiment or the corresponding configurations are designated by the same reference numerals and the description thereof will be omitted. .. In the second embodiment, the position of the connection between the external pipe (not shown) for guiding the hydraulic oil to the suction flow path 201 of the gear pump 1 and the external pipe (not shown) for guiding the hydraulic oil from the discharge flow path 202 of the gear pump 1 is , Different from the first embodiment.
　上記第１実施形態では、吸込流路１０１及び吐出流路１０２が直線状に設けられ、吸込側接続部１５１における吸込流路１０１の開口面１０１ａ及び吐出側接続部１５２における吐出流路１０２の開口面１０２ａが、それぞれ第２の面１４２と平行となるように、かつ、互いに同じ方向を向くように設けられていた（図３、図４参照）。 In the first embodiment, the suction flow path 101 and the discharge flow path 102 are provided in a straight line, and the opening surface 101a of the suction flow path 101 in the suction side connection portion 151 and the opening of the discharge flow path 102 in the discharge side connection portion 152. The surfaces 102a were provided so as to be parallel to the second surface 142 and to face each other in the same direction (see FIGS. 3 and 4).
　これに対して、第２実施形態では、吸込流路２０１及び吐出流路２０２が９０度屈曲するように設けられ（図８参照）、吸込側接続部２５１における吸込流路２０１の開口面２０１ａ及び吐出側接続部２５２における吐出流路２０２の開口面２０２ａが、それぞれ第２の面１４２と直交するように、かつ、互いに反対の方向を向くように設けられる（図５、図８参照）。 On the other hand, in the second embodiment, the suction flow path 201 and the discharge flow path 202 are provided so as to be bent by 90 degrees (see FIG. 8), and the opening surface 201a and the opening surface 201a of the suction flow path 201 in the suction side connection portion 251 are provided. The opening surfaces 202a of the discharge flow path 202 in the discharge side connection portion 252 are provided so as to be orthogonal to the second surface 142 and to face in opposite directions to each other (see FIGS. 5 and 8).
　以下、吸込側接続部２５１、吐出側接続部２５２及び連結リブ２５３の形状について、詳しく説明する。図５に示すように、吸込側接続部２５１と吐出側接続部２５２とは、略同様の形状とされ、左右対称となるように配置されている。図８に示すように、吸込側接続部２５１は、吸込流路２０１の一部を形成する吸込流路形成部としての機能を有し、吐出側接続部２５２は、吐出流路２０２の一部を形成する吐出流路形成部としての機能を有する。 Hereinafter, the shapes of the suction side connection portion 251 and the discharge side connection portion 252 and the connection rib 253 will be described in detail. As shown in FIG. 5, the suction side connection portion 251 and the discharge side connection portion 252 have substantially the same shape and are arranged so as to be symmetrical. As shown in FIG. 8, the suction side connection portion 251 has a function as a suction flow path forming portion forming a part of the suction flow path 201, and the discharge side connection portion 252 is a part of the discharge flow path 202. It has a function as a discharge flow path forming portion for forming the above.
　図５に示すように、吸込側接続部２５１は、その先端部が、本体部１４０から軸方向に直交する方向の一方（図示左方向）に突出している。図８に示すように、吸込側接続部２５１は、その先端面２５１ａに吸込流路２０１の開口面２０１ａが配置される。開口面２０１ａは、吸込側接続部２５１に形成される吸込流路２０１の作動油入口側の端部における流路断面（作動油の流れ方向に直交する断面）に相当する。図５に示すように、吐出側接続部２５２は、その先端部が、本体部１４０から軸方向に直交する方向の他方（図示右方向）に突出している。図８に示すように、吐出側接続部２５２は、その先端面２５２ａに吐出流路２０２の開口面２０２ａが配置される。開口面２０２ａは、吐出側接続部２５２に形成される吐出流路２０２の作動油出口側の端部における流路断面（作動油の流れ方向に直交する断面）に相当する。 As shown in FIG. 5, the tip of the suction side connection portion 251 protrudes from the main body portion 140 in one of the directions orthogonal to the axial direction (left direction in the drawing). As shown in FIG. 8, the suction side connection portion 251 has an opening surface 201a of the suction flow path 201 arranged on the tip surface 251a thereof. The opening surface 201a corresponds to a flow path cross section (a cross section orthogonal to the hydraulic oil flow direction) at the end of the suction flow path 201 formed on the suction side connection portion 251 on the hydraulic oil inlet side. As shown in FIG. 5, the tip of the discharge side connection portion 252 projects from the main body portion 140 in the other direction (right direction in the drawing) perpendicular to the axial direction. As shown in FIG. 8, the discharge side connection portion 252 has an opening surface 202a of the discharge flow path 202 arranged on the tip surface 252a thereof. The opening surface 202a corresponds to a flow path cross section (a cross section orthogonal to the hydraulic oil flow direction) at the end of the discharge flow path 202 formed on the discharge side connection portion 252 on the hydraulic oil outlet side.
　吐出側接続部２５２には、上記第１実施形態と同様、外部配管の継手が吐出流路２０２の開口部にねじ込まれることにより締結される。一方、上記第１実施形態では、吸込流路１０１の内周にめねじが形成されていたが、第２実施形態では、吸込流路２０１の内周にめねじは形成されていない。図６に示すように、吸込側接続部２５１は、吸込流路２０１の開口面２０１ａの周囲にねじ穴２５１ｈが４箇所形成されている。図示しないが、外部配管のフランジの貫通孔にボルトを挿通し、ボルトの先端部を吸込側接続部２５１に設けられたねじ穴２５１ｈに螺合させることにより、外部配管が吸込側接続部２５１に接続される。 Similar to the first embodiment, the discharge side connection portion 252 is fastened by screwing the joint of the external pipe into the opening of the discharge flow path 202. On the other hand, in the first embodiment, the female screw is formed on the inner circumference of the suction flow path 101, but in the second embodiment, the female screw is not formed on the inner circumference of the suction flow path 201. As shown in FIG. 6, the suction side connection portion 251 has four screw holes 251h formed around the opening surface 201a of the suction flow path 201. Although not shown, the external pipe is connected to the suction side connection portion 251 by inserting a bolt into the through hole of the flange of the external pipe and screwing the tip of the bolt into the screw hole 251h provided in the suction side connection portion 251. Be connected.
　上述のとおり、吸込側接続部２５１及び吐出側接続部２５２は、図５において左右方向に突出するように形成されている。また、図７に示すように、吸込側接続部２５１及び吐出側接続部２５２の一部は、第２の面１４２からも突出している。 As described above, the suction side connection portion 251 and the discharge side connection portion 252 are formed so as to project in the left-right direction in FIG. Further, as shown in FIG. 7, a part of the suction side connection portion 251 and the discharge side connection portion 252 also protrudes from the second surface 142.
　図５に示すように、吸込側接続部２５１は、リアカバー２０４Ｒの図示左右方向の中央側に基端部２５１ｂが設けられ、基端部２５１ｂから先端面２５１ａに向かって、第２の面１４２からの高さが徐々に高くなるように形成されている。また、吸込側接続部２５１は、図示上下方向の中央部から上方及び下方に向かって、基準面１４２ａからの高さが徐々に低くなるように形成されている。 As shown in FIG. 5, the suction side connection portion 251 is provided with a base end portion 251b on the central side of the rear cover 204R in the left-right direction in the drawing, and is provided from the base end portion 251b toward the tip surface 251a from the second surface 142. The height of the is gradually increased. Further, the suction side connecting portion 251 is formed so that the height from the reference surface 142a gradually decreases from the central portion in the vertical direction shown in the drawing upward and downward.
　吐出側接続部２５２は、リアカバー２０４Ｒの図示左右方向の中央側に基端部２５２ｂが設けられ、基端部２５２ｂから先端面２５２ａに向かって、第２の面１４２からの高さが徐々に高くなるように形成されている。また、吐出側接続部２５２は、図示上下方向の中央部から上方及び下方に向かって、基準面１４２ａからの高さが徐々に低くなるように形成されている。 The discharge side connection portion 252 is provided with a base end portion 252b on the central side of the rear cover 204R in the left-right direction in the drawing, and the height from the second surface 142 gradually increases from the base end portion 252b toward the tip end surface 252a. It is formed to be. Further, the discharge side connecting portion 252 is formed so that the height from the reference surface 142a gradually decreases from the central portion in the vertical direction shown in the drawing upward and downward.
　図５及び図７に示すように、連結リブ２５３は、吸込側接続部２５１の基端部２５１ｂと吐出側接続部２５２の基端部２５２ｂとを連結するように設けられる。つまり、連結リブ２５３は、吸込側接続部２５１における吸込流路２０１の開口面２０１ａとは反対側の部位と、吐出側接続部２５２における吐出流路２０２の開口面２０２ａとは反対側の部位と、を連結する。 As shown in FIGS. 5 and 7, the connecting rib 253 is provided so as to connect the base end portion 251b of the suction side connection portion 251 and the base end portion 252b of the discharge side connection portion 252. That is, the connecting rib 253 includes a portion of the suction side connection portion 251 opposite to the opening surface 201a of the suction flow path 201 and a portion of the discharge side connection portion 252 opposite to the opening surface 202a of the discharge flow path 202. , Are connected.
　吸込側接続部２５１の一部が基準面１４２ａから突出し、この突出部に連結リブ２５３が連結されている。このため、連結リブ２５３に加え、吸込側接続部２５１の突出部を第２の面１４２の変形を抑制する補強部（強度メンバ）として機能させることができる。吐出側接続部２５２の一部が基準面１４２ａから突出し、この突出部に連結リブ２５３が連結されている。このため、連結リブ２５３に加え、吐出側接続部２５２の突出部を第２の面１４２の変形を抑制する補強部（強度メンバ）として機能させることができる。 A part of the suction side connecting portion 251 protrudes from the reference surface 142a, and the connecting rib 253 is connected to this protruding portion. Therefore, in addition to the connecting rib 253, the protruding portion of the suction side connecting portion 251 can function as a reinforcing portion (strength member) that suppresses deformation of the second surface 142. A part of the discharge side connecting portion 252 projects from the reference surface 142a, and the connecting rib 253 is connected to this protruding portion. Therefore, in addition to the connecting rib 253, the protruding portion of the discharge side connecting portion 252 can function as a reinforcing portion (strength member) that suppresses deformation of the second surface 142.
　図７に示すように、連結リブ２５３の高さＨ２（基準面１４２ａからの軸方向長さ）は、外周リブ１５９の高さＨ１（基準面１４２ａからの軸方向長さ）よりも高く、吸込側接続部２５１の高さＨ３（基準面１４２ａからの軸方向長さ）よりも低い。また、連結リブ２５３の高さＨ２（基準面１４２ａからの軸方向長さ）は、吐出側接続部２５２の高さ（基準面１４２ａからの軸方向長さ）よりも低い。連結リブ２５３が、吸込側接続部２５１及び吐出側接続部２５２よりも突出していないため、外部機器に対するギアポンプ１の取付性を良好なものとすることができる。 As shown in FIG. 7, the height H2 of the connecting rib 253 (axial length from the reference surface 142a) is higher than the height H1 of the outer peripheral rib 159 (axial length from the reference surface 142a), and the suction is performed. It is lower than the height H3 of the side connecting portion 251 (the axial length from the reference surface 142a). Further, the height H2 of the connecting rib 253 (the axial length from the reference surface 142a) is lower than the height of the discharge side connecting portion 252 (the axial length from the reference surface 142a). Since the connecting rib 253 does not protrude from the suction side connection portion 251 and the discharge side connection portion 252, the mountability of the gear pump 1 to the external device can be improved.
　このような第２実施形態によれば、上記第１実施形態と同様、リアカバー２０４Ｒの剛性を向上することができ、ギアポンプ１の吐出圧の脈動に起因するリアカバー２０４Ｒの本体部１４０の変形を抑制することができる。 According to the second embodiment, the rigidity of the rear cover 204R can be improved as in the first embodiment, and the deformation of the main body 140 of the rear cover 204R due to the pulsation of the discharge pressure of the gear pump 1 can be suppressed. can do.
　さらに第２実施形態では、図５に示すように、連結リブ２５３の図示左右中央部から上下方向に延在する補強リブ２５４が設けられている。補強リブ２５４は、連結リブ２５３と直交するように設けられ、連結リブ２５３と外周リブ１５９とを連結する。これにより、リアカバー２０４Ｒの剛性をより高めることができる。 Further, in the second embodiment, as shown in FIG. 5, a reinforcing rib 254 extending in the vertical direction from the left and right central portions of the connecting rib 253 is provided. The reinforcing rib 254 is provided so as to be orthogonal to the connecting rib 253, and connects the connecting rib 253 and the outer peripheral rib 159. As a result, the rigidity of the rear cover 204R can be further increased.
　次のような変形例も本発明の範囲内であり、変形例に示す構成と上述の実施形態で説明した構成を組み合わせたり、上述の異なる実施形態で説明した構成同士を組み合わせたり、以下の異なる変形例で説明する構成同士を組み合わせることも可能である。 The following modifications are also within the scope of the present invention, and the configurations shown in the modifications and the configurations described in the above-described embodiments can be combined, the configurations described in the above-mentioned different embodiments can be combined, and the following differences can be made. It is also possible to combine the configurations described in the modified example.
　＜変形例１＞
　上記第１実施形態では、吸込側接続部１５１と吐出側接続部１５２とを連結する連結リブ１５３を一つ形成する例について説明したが、本発明はこれに限定されない。図９に示すように、吸込側接続部１５１と吐出側接続部１５２とを連結する連結リブ１５３は、二つ形成するようにしてもよい。また、図示しないが、連結リブ１５３は、三つ以上形成してもよい。 <Modification example 1>
In the first embodiment described above, an example of forming one connecting rib 153 that connects the suction side connecting portion 151 and the discharging side connecting portion 152 has been described, but the present invention is not limited thereto. As shown in FIG. 9, two connecting ribs 153 connecting the suction side connection portion 151 and the discharge side connection portion 152 may be formed. Further, although not shown, three or more connecting ribs 153 may be formed.
　＜変形例２＞
　上記実施形態では、ボディ１０４Ｂにフロントカバー１０４Ｆ及びリアカバー１０４Ｒが締結される例について説明したが、本発明はこれに限定されない。例えば、フロントカバー１０４Ｆ及びリアカバー１０４Ｒの一方とボディ１０４Ｂとを一体に形成するようにしてもよい。この場合、ボディ１０４Ｂは、一端が開口し、他端が底部とされる有底筒状を呈する。 <Modification 2>
In the above embodiment, an example in which the front cover 104F and the rear cover 104R are fastened to the body 104B has been described, but the present invention is not limited thereto. For example, one of the front cover 104F and the rear cover 104R and the body 104B may be integrally formed. In this case, the body 104B has a bottomed tubular shape with one end open and the other end at the bottom.
　＜変形例３＞
　上記実施形態では、液圧回転機として、ギアポンプ１を例に説明したが、本発明はこれに限定されない。液圧回転機として、ピストンポンプ、ベーンポンプ等の他のポンプを採用した場合にも本発明を適用できる。また、ポンプに限定されることもなく、液圧回転機として、ギアモータ、ピストンモータ、ベーンモータ等のモータを採用し、モータの吐出側接続部と吸込側接続部とをリブで連結するようにしてもよい。ケースの一部を構成するケース部材の一平面上に吐出側接続部及び吸込側接続部が設けられる種々の液圧回転機において、吐出側接続部と吸込側接続部とをリブで連結することにより、ケース部材の重量の増加を抑制しつつ、ケース部材の剛性を効果的に向上することができる。 <Modification example 3>
In the above embodiment, the gear pump 1 has been described as an example of the hydraulic rotary machine, but the present invention is not limited thereto. The present invention can also be applied when another pump such as a piston pump or a vane pump is adopted as the hydraulic rotary machine. Further, without being limited to a pump, a motor such as a gear motor, a piston motor, or a vane motor is adopted as a hydraulic rotary machine, and the discharge side connection portion and the suction side connection portion of the motor are connected by ribs. May be good. In various hydraulic rotary machines in which a discharge side connection portion and a suction side connection portion are provided on one plane of a case member constituting a part of the case, the discharge side connection portion and the suction side connection portion are connected by ribs. Therefore, the rigidity of the case member can be effectively improved while suppressing the increase in the weight of the case member.
　以上のように構成された本発明の実施形態の構成、作用、および効果をまとめて説明する。なお、括弧内の構成は例示である。 The configuration, action, and effect of the embodiment of the present invention configured as described above will be collectively described. The configuration in parentheses is an example.
　液圧回転機（ギアポンプ１）は、ケース部材（リアカバー１０４Ｒ，２０４Ｒ）と、ケース部材（リアカバー１０４Ｒ，２０４Ｒ）に対して回転する回転軸１１と、を備え、ケース部材（リアカバー１０４Ｒ，２０４Ｒ）は、本体部１４０と、本体部１４０から突出し、吸込流路１０１，２０１の一部を形成する吸込流路形成部（吸込側接続部１５１，２５１）と、本体部１４０から突出し、吐出流路１０２，２０２の一部を形成する吐出流路形成部（吐出側接続部１５２，２５２）と、本体部１４０から突出し、吸込流路形成部（吸込側接続部１５１，２５１）と吐出流路形成部（吐出側接続部１５２，２５２）とを連結するリブ（連結リブ１５３，２５３）と、を有する。 The hydraulic rotary machine (gear pump 1) includes a case member ( rear cover 104R, 204R) and a rotating shaft 11 that rotates with respect to the case member ( rear cover 104R, 204R), and the case member ( rear cover 104R, 204R) includes a case member ( rear cover 104R, 204R). , The suction flow path forming portion (suction side connection portion 151,251) protruding from the main body portion 140 and forming a part of the suction flow paths 101 and 201, and the discharge flow path 102 protruding from the main body portion 140. , 202, a discharge flow path forming part (discharge side connection part 152, 252), a suction flow path forming part (suction side connection part 151, 251) and a discharge flow path forming part protruding from the main body 140. It has ribs (connecting ribs 153, 253) for connecting (discharging side connecting portions 152, 252).
　この構成では、吸込流路形成部（吸込側接続部１５１，２５１）と吐出流路形成部（吐出側接続部１５２，２５２）とをリブ（連結リブ１５３，２５３）によって連結することにより、吸込流路形成部（吸込側接続部１５１，２５１）及び吐出流路形成部（吐出側接続部１５２，２５２）を強度メンバとして利用し、リブ（連結リブ１５３，２５３）、吸込流路形成部（吸込側接続部１５１，２５１）及び吐出流路形成部（吐出側接続部１５２，２５２）によってケース部材（リアカバー１０４Ｒ，２０４Ｒ）の剛性を向上することができる。これにより、液圧回転機（ギアポンプ１）の重量の増加を抑えつつ、騒音の発生を抑制することができる。 In this configuration, the suction flow path forming portion (suction side connection portion 151,251) and the discharge flow path forming portion (discharge side connection portion 152,252) are connected by ribs (connecting ribs 153, 253) to suck in. Using the flow path forming part (suction side connection part 151,251) and the discharge flow path forming part (discharge side connecting part 152,252) as strength members, the rib (connecting rib 153,253) and the suction flow path forming part ( The rigidity of the case members (rear covers 104R and 204R) can be improved by the suction side connection portions 151 and 251) and the discharge flow path forming portions (discharge side connection portions 152 and 252). As a result, it is possible to suppress the generation of noise while suppressing the increase in the weight of the hydraulic rotary machine (gear pump 1).
　液圧回転機（ギアポンプ１）は、筒状のボディ１０４Ｂを備え、ケース部材が、ボディ１０４Ｂの開口を閉塞するカバー（リアカバー１０４Ｒ，２０４Ｒ）であり、カバー（リアカバー１０４Ｒ，２０４Ｒ）が、ボディ１０４Ｂに当接する第１の面１４１と、第１の面１４１とは反対側に設けられる第２の面１４２と、を有する本体部１４０と、第２の面１４２から突出する吸込流路形成部（吸込側接続部１５１，２５１）と、第２の面１４２から突出する吐出流路形成部（吐出側接続部１５２，２５２）と、第２の面１４２から突出するリブ（連結リブ１５３，２５３）と、を有する。 The hydraulic rotary machine (gear pump 1) includes a tubular body 104B, the case member is a cover ( rear cover 104R, 204R) that closes the opening of the body 104B, and the cover ( rear cover 104R, 204R) is the body 104B. A main body portion 140 having a first surface 141 abutting on the first surface 141 and a second surface 142 provided on the opposite side of the first surface 141, and a suction flow path forming portion protruding from the second surface 142 ( Suction side connection parts 151,251), discharge flow path forming parts (discharge side connection parts 152, 252) protruding from the second surface 142, and ribs protruding from the second surface 142 (connecting ribs 153, 253). And have.
　液圧回転機（ギアポンプ１）は、吸込流路形成部（吸込側接続部１５１）における吸込流路１０１の開口面１０１ａ及び吐出流路形成部（吐出側接続部１５２）における吐出流路１０２の開口面１０２ａが、それぞれ第２の面１４２と平行となるように、かつ、互いに同じ方向を向くように設けられ、リブ（連結リブ１５３）が、吸込流路形成部（吸込側接続部１５１）における第２の面１４２から吸込流路１０１の開口面１０１ａに向かって延在する部位と、吐出流路形成部（吐出側接続部１５２）における第２の面１４２から吐出流路１０２の開口面１０２ａに向かって延在する部位と、を連結する。 The hydraulic rotary machine (gear pump 1) has an opening surface 101a of the suction flow path 101 in the suction flow path forming portion (suction side connection portion 151) and a discharge flow path 102 in the discharge flow path forming portion (discharge side connection portion 152). The opening surfaces 102a are provided so as to be parallel to the second surface 142 and to face each other in the same direction, and ribs (connecting ribs 153) are provided to form a suction flow path (suction side connecting portion 151). A portion extending from the second surface 142 to the opening surface 101a of the suction flow path 101, and an opening surface of the discharge flow path 102 from the second surface 142 of the discharge flow path forming portion (discharge side connection portion 152). A portion extending toward 102a is connected.
　液圧回転機（ギアポンプ１）は、吸込流路形成部（吸込側接続部２５１）における吸込流路２０１の開口面２０１ａ及び吐出流路形成部（吐出側接続部２５２）における吐出流路２０２の開口面２０２ａが、それぞれ第２の面１４２と直交するように、かつ、互いに反対の方向を向くように設けられ、リブ（連結リブ２５３）が、吸込流路形成部（吸込側接続部２５１）における吸込流路２０１の開口面２０１ａとは反対側の部位と、吐出流路形成部（吐出側接続部２５２）における吐出流路２０２の開口面２０２ａとは反対側の部位と、を連結する。 The hydraulic rotary machine (gear pump 1) has an opening surface 201a of the suction flow path 201 in the suction flow path forming portion (suction side connection portion 251) and a discharge flow path 202 in the discharge flow path forming portion (discharge side connection portion 252). The opening surfaces 202a are provided so as to be orthogonal to the second surface 142 and to face in opposite directions, and ribs (connecting ribs 253) are provided to form a suction flow path (suction side connecting portion 251). The portion of the suction flow path 201 opposite to the opening surface 201a and the portion of the discharge flow path forming portion (discharge side connection portion 252) opposite to the opening surface 202a of the discharge flow path 202 are connected.
　これらの構成では、カバー（リアカバー１０４Ｒ，２０４Ｒ）に設けられる吸込流路形成部（吸込側接続部１５１，２５１）と吐出流路形成部（吐出側接続部１５２，２５２）とをリブ（連結リブ１５３，２５３）によって連結することにより、カバー（リアカバー１０４Ｒ，２０４Ｒ）の剛性を向上することができる。 In these configurations, the suction flow path forming portions (suction side connection portions 151 and 251) and the discharge flow path forming portions (discharge side connection portions 152 and 252) provided on the cover (rear covers 104R and 204R) are ribbed (connecting ribs). By connecting with 153,253), the rigidity of the cover ( rear cover 104R, 204R) can be improved.
　以上、本発明の実施形態について説明したが、上記実施形態は本発明の適用例の一部を示したに過ぎず、本発明の技術的範囲を上記実施形態の具体的構成に限定する趣旨ではない。 Although the embodiments of the present invention have been described above, the above embodiments are only a part of the application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiments. Absent.
　本願は２０１９年３月２２日に日本国特許庁に出願された特願２０１９－５５０６６に基づく優先権を主張し、この出願の全ての内容は参照により本明細書に組み込まれる。 This application claims priority based on Japanese Patent Application No. 2019-55066 filed with the Japan Patent Office on March 22, 2019, and the entire contents of this application are incorporated herein by reference.

Claims (4)

  1. 　液圧回転機であって、
    　ケース部材と、
    　前記ケース部材に対して回転する回転軸と、を備え、
    　前記ケース部材は、
    　本体部と、
    　前記本体部から突出し、吸込流路の一部を形成する吸込流路形成部と、
    　前記本体部から突出し、吐出流路の一部を形成する吐出流路形成部と、
    　前記本体部から突出し、前記吸込流路形成部と前記吐出流路形成部とを連結するリブと、を有する液圧回転機。     It is a hydraulic rotary machine
    Case member and
    A rotating shaft that rotates with respect to the case member is provided.
    The case member
    With the main body
    A suction flow path forming portion that protrudes from the main body portion and forms a part of the suction flow path,
    A discharge flow path forming portion that protrudes from the main body portion and forms a part of the discharge flow path,
    A hydraulic rotary machine having ribs that protrude from the main body and connect the suction flow path forming portion and the discharge flow path forming portion.
  2. 　請求項１に記載の液圧回転機であって、
    　筒状のボディを備え、
    　前記ケース部材は、前記ボディの開口を閉塞するカバーであり、
    　前記カバーは、
    　前記ボディに当接する第１の面と、前記第１の面とは反対側に設けられる第２の面と、を有する前記本体部と、
    　前記第２の面から突出する前記吸込流路形成部と、
    　前記第２の面から突出する前記吐出流路形成部と、
    　前記第２の面から突出する前記リブと、を有する液圧回転機。     The hydraulic rotary machine according to claim 1.
    With a tubular body,
    The case member is a cover that closes the opening of the body.
    The cover is
    The main body portion having a first surface abutting on the body and a second surface provided on a side opposite to the first surface.
    With the suction flow path forming portion protruding from the second surface,
    With the discharge flow path forming portion protruding from the second surface,
    A hydraulic rotary machine having the ribs protruding from the second surface.
  3. 　請求項２に記載の液圧回転機であって、
    　前記吸込流路形成部における前記吸込流路の開口面及び前記吐出流路形成部における前記吐出流路の開口面は、それぞれ前記第２の面と平行となるように、かつ、互いに同じ方向を向くように設けられ、
    　前記リブは、前記吸込流路形成部における前記第２の面から前記吸込流路の開口面に向かって延在する部位と、前記吐出流路形成部における前記第２の面から前記吐出流路の開口面に向かって延在する部位と、を連結する液圧回転機。     The hydraulic rotary machine according to claim 2.
    The opening surface of the suction flow path in the suction flow path forming portion and the opening surface of the discharge flow path in the discharge flow path forming portion are parallel to the second surface and in the same direction as each other. It is provided so that it faces
    The ribs extend from the second surface of the suction flow path forming portion toward the opening surface of the suction flow path, and the discharge flow path from the second surface of the discharge flow path forming portion. A hydraulic rotary machine that connects a part extending toward the opening surface of the.
  4. 　請求項２に記載の液圧回転機であって、
    　前記吸込流路形成部における前記吸込流路の開口面及び前記吐出流路形成部における前記吐出流路の開口面は、それぞれ前記第２の面と直交するように、かつ、互いに反対の方向を向くように設けられ、
    　前記リブは、前記吸込流路形成部における前記吸込流路の開口面とは反対側の部位と、前記吐出流路形成部における前記吐出流路の開口面とは反対側の部位と、を連結する液圧回転機。     The hydraulic rotary machine according to claim 2.
    The opening surface of the suction flow path in the suction flow path forming portion and the opening surface of the discharge flow path in the discharge flow path forming portion are orthogonal to the second surface and are oriented in opposite directions. It is provided so that it faces
    The rib connects a portion of the suction flow path forming portion opposite to the opening surface of the suction flow path and a portion of the discharge flow path forming portion opposite to the opening surface of the discharge flow path. Hydraulic rotary machine.
PCT/JP2020/008520 2019-03-22 2020-02-28 Hydraulic rotary machine WO2020195554A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022137639A1 (en) * 2020-12-22 2022-06-30 株式会社島津製作所 Hydraulic device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4265602A (en) * 1978-11-15 1981-05-05 Kayabakogyokabushikikaisha Gear pump with low pressure shaft lubrication
US4470776A (en) * 1979-11-28 1984-09-11 Commercial Shearing, Inc. Methods and apparatus for gear pump lubrication

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4265602A (en) * 1978-11-15 1981-05-05 Kayabakogyokabushikikaisha Gear pump with low pressure shaft lubrication
US4470776A (en) * 1979-11-28 1984-09-11 Commercial Shearing, Inc. Methods and apparatus for gear pump lubrication

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022137639A1 (en) * 2020-12-22 2022-06-30 株式会社島津製作所 Hydraulic device

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