WO2024108746A1 - Ball screw nut, ball screw, and electro-hydraulic braking device - Google Patents

Ball screw nut, ball screw, and electro-hydraulic braking device Download PDF

Info

Publication number
WO2024108746A1
WO2024108746A1 PCT/CN2023/070760 CN2023070760W WO2024108746A1 WO 2024108746 A1 WO2024108746 A1 WO 2024108746A1 CN 2023070760 W CN2023070760 W CN 2023070760W WO 2024108746 A1 WO2024108746 A1 WO 2024108746A1
Authority
WO
WIPO (PCT)
Prior art keywords
ball
ball screw
retaining frame
screw nut
sleeve
Prior art date
Application number
PCT/CN2023/070760
Other languages
French (fr)
Chinese (zh)
Inventor
吴少雄
徐志力
付兰平
郑飞翔
王书元
刘建
Original Assignee
舍弗勒技术股份两合公司
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 舍弗勒技术股份两合公司 filed Critical 舍弗勒技术股份两合公司
Publication of WO2024108746A1 publication Critical patent/WO2024108746A1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B23C3/28—Grooving workpieces
    • B23C3/32—Milling helical grooves, e.g. in making twist-drills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members

Definitions

  • the present invention relates to the technical field of transmission devices, and in particular to a ball screw nut, a ball screw and an electro-hydraulic brake device.
  • the ball screw is a structure that converts rotary motion into linear motion, or converts linear motion into rotary motion.
  • the working principle of the ball screw is to convert the original sliding friction into rolling friction by using the rolling of the balls, so its friction coefficient is greatly reduced, thereby improving the transmission efficiency.
  • a ball screw in the related art, includes a screw shaft, a nut and balls.
  • the outer surface of the screw shaft and the inner surface of the nut form a spiral raceway, and the balls fill the spiral raceway and circulate through the circulating raceway in the nut.
  • the internal circulation uses a reverser (with a circulating raceway) to achieve ball circulation.
  • the dimensional accuracy requirements of the reverser and the inner raceway are high, and there is also a risk of jamming.
  • the present invention provides a ball screw nut, a ball screw and an electro-hydraulic brake device.
  • the present invention provides a ball screw nut, characterized in that it includes: a sleeve, the sleeve is provided with a receiving hole extending radially therethrough; a retaining frame fixed in the receiving hole, the retaining frame being provided with a receiving cavity; a first ball, rollably embedded in the receiving cavity of the retaining frame and partially protruding from an inner wall of the sleeve; and a second ball, located between the first ball and the inner wall of the receiving cavity of the retaining frame, for enabling the first ball to roll relative to the retaining frame.
  • a boss is provided in the receiving hole, so that the receiving hole is stepped; a flange is extended from the radial outer side of the retaining frame, and the flange partially or completely covers the boss in the radial direction.
  • the retaining frame can adjust the radial position in the receiving hole along the radial direction, and the height of the first ball protruding from the inner wall of the sleeve can be adjusted by adjusting the radial position of the retaining frame in the receiving hole.
  • the ball screw nut also includes an adjusting ring, which is used to be clamped on the outside of the retaining frame to fix the radial position of the retaining frame in the receiving hole; wherein the radial outer side of the adjusting ring abuts against the flange of the retaining frame, and the radial inner side of the adjusting ring abuts against the boss of the receiving hole.
  • a curved baffle is provided on the radial inner side of the retaining frame, and the curved baffle makes the opening diameter of the accommodating cavity smaller than the diameter of the first ball.
  • the diameter of the second ball is smaller than the diameter of the first ball.
  • the sleeve is provided with a plurality of the accommodating holes, and the plurality of the accommodating holes are spaced apart along the circumference of the sleeve and arranged in a spiral shape.
  • a plurality of second balls are disposed in each of the accommodating cavities of the retaining frame.
  • the present invention provides a ball screw, comprising: a screw shaft, the outer wall of which is provided with a spiral groove; and a ball screw nut as described in the first aspect, wherein the ball screw nut is sleeved on the outside of the screw shaft; wherein the first ball rolls along the spiral groove, and the distance between the ball centers of two axially adjacent first balls is greater than the groove distance of two adjacent spiral grooves.
  • the present invention provides an electro-hydraulic brake device, comprising: a ball screw, a reducer, a motor, a piston and a housing as described in the second aspect; the motor is connected to one axial end of the ball screw via the reducer, the other axial end of the ball screw is connected to the piston, and the piston is arranged inside the housing to reciprocate axially.
  • the first ball can realize non-circulating rolling on the nut, avoiding the risk of internal circulation in the nut and causing jamming;
  • the receiving hole is easy to process, and the first ball is fixed in the receiving hole through the retaining frame.
  • the first ball is also easy to fix and install, which reduces the number of parts, is easy to disassemble and replace, and reduces the cost of production, installation and maintenance;
  • the height of the first ball protruding from the inner wall of the sleeve can be adjusted by adjusting the position of the retainer in the radial direction of the receiving hole, so as to obtain the best matching state relative to the depth and cross-sectional shape of the spiral groove, so that the ball screw nut can match different screw shafts with high adaptability;
  • the friction between the first ball and the inner wall of the retaining frame can be reduced, further extending the service life of the ball screw nut.
  • FIG1 is a schematic diagram of a three-dimensional structure of a ball screw nut according to an exemplary embodiment
  • FIG2 is a cross-sectional view showing a ball screw rotating clockwise according to an exemplary embodiment
  • FIG3 is a cross-sectional view showing a ball screw rotating counterclockwise according to an exemplary embodiment
  • FIG4 is an enlarged view of a local portion A in FIG2 ;
  • FIG5 is a cross-sectional view of a cage, a first ball, and a second ball according to an exemplary embodiment
  • FIG6 is a perspective view of a cage, a first ball, and a second ball from another perspective according to an exemplary embodiment
  • FIG. 7 is a cross-sectional view of an electro-hydraulic brake device according to an exemplary embodiment.
  • the axial direction A, radial direction R and circumferential direction refer to the axial direction A, radial direction R and circumferential direction of the ball screw 1 respectively; one axial side refers to the left side in Figures 1, 2 and 3, and the other axial side refers to the right side in Figures 1, 2 and 3; the radial outer side refers to the side away from the center axis O in Figures 2 and 3 in the radial direction R (the upper side in Figures 2 and 3), and the radial inner side refers to the side close to the center axis O in the radial direction R (the lower side in Figures 2 and 3).
  • the ball screw nut 100 is suitable for installation in the ball screw 1.
  • the ball screw nut 100 according to the embodiment of the present invention is described below in conjunction with Figures 2 and 3, wherein Figure 2 shows a cross-sectional view of the ball screw 1 rotating clockwise according to the embodiment of the present invention, wherein the axial movement of the ball screw nut 100 is indicated by arrow X1; Figure 3 shows a cross-sectional view of the ball screw 1 rotating counterclockwise according to the embodiment of the present invention, wherein the axial movement of the ball screw nut 100 is indicated by arrow X2.
  • transmission connection refers to the ability to transmit driving force/torque between two components, and the two components can be directly connected or through various transmission mechanisms or connection structures to achieve the above functions.
  • transmission connection refers to the ability to transmit driving force/torque between two components, and the two components can be directly connected or through various transmission mechanisms or connection structures to achieve the above functions.
  • torque-resistant connection refers to the connection between two elements in a manner that does not rotate relative to each other, which can be achieved through a press fit (i.e., an interference fit) or by forming the two components mentioned in one piece.
  • the ball screw 1 is a high-precision transmission device.
  • the ball screw 1 includes a screw shaft 200, a ball screw nut 100 and balls.
  • the rotation of the screw shaft 200 causes the balls to push the nut axial direction A to move.
  • a rolling friction screw is used instead of a sliding friction screw.
  • the ball needs to circulate and roll inside the nut, and the joints between the grooves of the inner raceway are difficult to be made smooth, which affects the stability of the ball.
  • the inner circulation uses a reverser (with a circulating raceway) to achieve ball circulation.
  • the reverser and the inner raceway have high dimensional accuracy requirements and there is also a risk of jamming. Therefore, the inner raceway and the circulating raceway of the nut are difficult to manufacture, making the ball screw nut 100 difficult and costly to manufacture, resulting in very high investment in the manufacturing industry.
  • the present invention provides a ball screw nut 100, as shown in FIG1, comprising a sleeve 10, a retaining frame 20, a first ball 30 and a second ball 40.
  • the retaining frame 20 is detachably fixed to the sleeve 10
  • the first ball 30 is fixed to the sleeve 10 through the retaining frame 20 and can move along the axial direction A with the sleeve 10, so that the non-circulating axial movement A of the first ball 30 is realized to avoid the risk of getting stuck.
  • the first ball 30 can roll relative to the retaining frame 20 and the sleeve 10 through the second ball 40 to reduce friction.
  • the sleeve 10 is a cylindrical structure extending and penetrating along the axial direction A.
  • the sleeve 10 has a receiving hole 11 penetrating along the radial direction R on its wall, and each receiving hole 11 can accommodate at least one first ball 30.
  • the screw shaft 200 rotates and pushes the sleeve 10 to move in the axial direction A through the first ball 30, the hole wall of the receiving hole 11 limits the circumferential movement of the first ball 30 along the sleeve 10, so that the first ball 30 can only rotate in the receiving hole 11 and move in the axial direction A with the sleeve 10.
  • the retainer 20 is fixed in the receiving hole 11 , and the retainer 20 is provided with a receiving cavity 21 .
  • the first ball 30 is rollably embedded in the receiving cavity 21 of the retainer 20 and partially protrudes from the inner wall of the sleeve 10 .
  • the accommodating cavity 21 of the retaining frame 20 is an accommodating cavity 21 with an opening, and the opening is located on the radial inner side of the retaining frame 20.
  • the first ball 30 is located in the accommodating cavity 21.
  • the opening diameter V1 is smaller than the diameter D1 of the first ball 30, so that the first ball 30 can be retained in the retaining frame 20 and does not separate from the retaining frame 20.
  • the opening can also make the first ball 30 protrude from the retaining frame 20 on the radial inner side of the retaining frame 20.
  • the first ball 30 can protrude from the inner wall of the sleeve 10 and abut against the spiral groove 50 on the outer wall of the screw shaft 200.
  • the size of the accommodating cavity 21 of the retaining frame 20 can be different.
  • the retaining frame 20 with a corresponding size of the accommodating cavity 21 can be selected according to the diameter of the first ball 30 and the preset height of the first ball 30 protruding from the retaining frame 20.
  • the retaining frame 20 is fixed in the receiving hole 11 , that is, the retaining frame 20 cannot move axially or rotate circumferentially relative to the receiving hole 11 , thereby achieving a torsion-resistant connection between the retaining frame 20 and the receiving hole 11 .
  • the retaining frame 20 can be interference fit with the receiving hole 11 to achieve a torsion-resistant connection; in other embodiments, the retaining frame 20 and the receiving hole 11 can be torsion-resistant connected by means of a key and a keyway, and the key and the keyway are respectively arranged on the outer wall of the retaining frame 20 and one of the inner walls of the receiving hole 11; in other embodiments, the retaining frame 20 and the receiving hole 11 can be connected by threads and torsion-resistant connection can be achieved by fixing parts, which are not listed here one by one.
  • the second ball 40 is located between the first ball 30 and the inner wall of the accommodating cavity 21 of the cage 20, and is used to make the first ball 30 roll relative to the cage 20.
  • the friction between the first ball 30 and the inner wall of the cage 20 can be reduced, and the service life of the ball screw nut 100 can be further extended.
  • the diameter of the second ball 40 is smaller than the diameter D1 of the first ball 30.
  • the diameter of the second ball 40 may be one sixth of the diameter D1 of the first ball 30.
  • a plurality of second balls 40 are arranged in each accommodating cavity 21 of the retaining frame 20.
  • the plurality of second balls 40 having a diameter much smaller than that of the first ball 30 cover the outer surface of the first ball 30 located in the accommodating cavity 21, so that the first ball 30 is completely isolated from the inner wall of the accommodating cavity 21 of the retaining frame 20, and the first ball 30 is subjected to a more uniform force when rolling relative to the retaining frame 20, so as to avoid contact and friction between the second ball 40 and the retaining frame 20.
  • the sleeve 10 is provided with a plurality of accommodating holes 11 , and the plurality of accommodating holes 11 are spaced apart along the circumference of the sleeve 10 and arranged in a spiral shape.
  • each receiving hole 11 only receives one retainer 20, and each retainer 20 is also provided with only one receiving cavity 21, and each receiving cavity 21 receives one first ball 30 and a plurality of second balls 40.
  • the plurality of receiving holes 11 are arranged at intervals along the axial direction A of the sleeve 10 and are arranged in a spiral shape, so that the arrangement tracks of the plurality of first balls 30 in the plurality of receiving holes 11 match the spiral groove 50 on the outer wall of the screw shaft 200.
  • the process of processing the receiving hole 11 on the sleeve 10 is simpler, so it can save the cost of parts, manufacturing investment and processing technology cost.
  • the first ball 30 is rolled and installed in the receiving cavity 21 of the retainer 20, and the installation is also more convenient.
  • the first ball 30 and the retainer 20 are fixed in the receiving hole 11 as a whole.
  • the independent retainer 20 structure not only makes the first ball 30 easy to fix and install, but also easy to disassemble and replace, reducing the cost of production, installation and maintenance.
  • the receiving hole 11 can be in any shape such as circular, square, triangular, etc., and the outer wall contour shape of the retaining frame 20 can match the inner wall contour shape of the receiving hole 11, which are not listed here one by one.
  • the retaining frame 20 is torsionally connected to the receiving hole 11.
  • the receiving hole 11 is a stepped hole, including an inner hole located radially inwardly and an outer hole located radially outwardly.
  • the diameter of the outer hole is larger than the diameter of the inner hole. Therefore, a boss 111 is formed between the inner hole and the outer hole, making the receiving hole 11 stepped.
  • the radial outer side of the retaining frame 20 extends along the axial direction A and forms a flange 22, which partially or completely covers the boss 111 along the radial direction R, that is, the outer diameter of the flange 22 is larger than the diameter of the inner hole and equal to or smaller than the diameter of the outer hole.
  • the outer wall of the retainer 20 can be interference fit with the inner hole of the receiving hole 11, or through key and keyway fit, or through thread fit, so that the retainer 20 can be prevented from being separated from the sleeve 10.
  • the flange 22 of the retainer 20 can abut against the boss 111, and the boss 111 can be used to limit the lowest position of the retainer 20 in the receiving hole 11 along the radial direction R, preventing the retainer 20 from moving toward the screw shaft 200, so that the first ball 30 transitionally presses the spiral groove 50 of the screw shaft 200.
  • the retainer 20 cannot rotate relative to the receiving hole 11 in the receiving hole 11, but in some embodiments, the retainer 20 can move in the radial direction R in the receiving hole 11, and the height H of the first ball 30 protruding from the inner wall of the sleeve 10 is adjusted by adjusting the radial position of the retainer 20 in the receiving hole 11.
  • the protrusion amount of the second ball 40 from the radial inner side of the sleeve 10 is set to obtain the best matching state with respect to the depth and cross-sectional shape of the spiral groove 50 of the screw shaft 200, so that the ball screw nut 100 can match the screw shaft 200 with the spiral groove 50 of different groove widths V2, and has high versatility and adaptability.
  • the ball screw nut 100 also includes an adjusting ring (not shown in the figure), which is used to be clamped on the outside of the retaining frame 20 to fix the radial position of the retaining frame 20 in the receiving hole 11; wherein the radial outer side of the adjusting ring abuts against the flange 22 of the retaining frame 20, and the radial inner side of the adjusting ring abuts against the boss 111 of the receiving hole 11.
  • an adjusting ring (not shown in the figure), which is used to be clamped on the outside of the retaining frame 20 to fix the radial position of the retaining frame 20 in the receiving hole 11; wherein the radial outer side of the adjusting ring abuts against the flange 22 of the retaining frame 20, and the radial inner side of the adjusting ring abuts against the boss 111 of the receiving hole 11.
  • the adjustment ring can be a C-shaped snap ring, which is clamped on the outside of the retaining frame 20.
  • the C-shaped snap ring is clamped on the outside of the retaining frame 20, and the radial outer side of the C-shaped snap ring abuts against the flange 22 of the retaining frame 20, and the radial inner side of the C-shaped snap ring abuts against the boss 111 of the receiving hole 11.
  • C-shaped snap rings there can be multiple C-shaped snap rings, that is, the thickness along the radial direction R is different. According to the radial position of the retainer 20 in the receiving hole 11, a C-shaped snap ring of corresponding thickness can be selected, or according to the radial position of the retainer 20 in the receiving hole 11, multiple C-shaped snap rings of the same thickness can be selected for stacking. In this way, the radial position of the retainer 20 can be adjusted or the retainer 20 can be fixed at the corresponding radial position by simply removing or clamping the C-shaped snap ring. This makes the adjustment of the radial position of the retainer 20 in the receiving hole 11 more convenient and quick.
  • scale lines can be provided on the outer wall of the retaining frame 20, and each scale line corresponds to the height of the first ball 30 protruding from the inner wall of the sleeve 10 (also referred to as the protrusion amount), so that the radial position adjustment of the retaining frame 20 is more accurate, avoiding the transition radial R extrusion or insufficient contact between the first ball 30 and the inner wall of the spiral groove 50 of the screw shaft 200, which affects the transmission performance of the ball screw 1.
  • a curved baffle 23 is provided on the radial inner side of the retainer 20, and the curved baffle 23 makes the opening diameter V1 of the accommodating cavity 21 smaller than the diameter of the first ball 30.
  • the size of the opening diameter V1 of the accommodating cavity 21 can also be limited by bending the bending angle of the bending baffle 23, thereby controlling the protrusion of the first ball 30 from the inner wall of the sleeve 10, so as to obtain the best matching state of the depth and cross-sectional shape of the spiral groove 50 relative to the screw shaft 200, and further enable the ball screw nut 100 to match the screw shaft 200 with the spiral groove 50 of different groove widths V2, thereby improving the versatility and adaptability of the ball screw nut 100.
  • the present invention provides a ball screw 1, as shown in Figures 2 and 3, including a screw shaft 200 and the above-mentioned ball screw nut 100, and the ball screw nut 100 is sleeved on the outside of the screw shaft 200.
  • the outer wall of the screw shaft 200 is provided with a spiral groove 50; the first ball 30 rolls along the spiral groove 50, and the ball center distance W1 of two adjacent first balls 30 in the axial direction A is greater than the groove distance W2 of two adjacent spiral grooves 50.
  • the screw shaft 200 does not need to rotate so many times, and the rotation speed of the screw shaft 200 is relatively low, which not only increases the torque, but also reduces the rotation noise and wear.
  • FIG. 2 a cross-sectional view of the ball screw 1 rotating clockwise is shown.
  • FIG. 3 a cross-sectional view of the ball screw 1 rotating counterclockwise is shown.
  • the spiral groove 50 of the screw shaft 200 drives the ball screw nut 100 to move rightward along the axis through the first ball 30.
  • the first ball 30 rolls relative to the retainer 20 and the sleeve 10 through the second ball 40, and moves along the axial direction A with the sleeve 10, realizing non-circular rolling.
  • Fig. 7 shows a cross-sectional view of an electro-hydraulic brake device according to an exemplary embodiment.
  • the electro-hydraulic brake device comprises: a ball screw 1, a reducer 2, a motor 3, a piston 4 and a housing 5.
  • the motor 3 is connected to one axial end of the ball screw 1 via the reducer 2.
  • the torque of the motor 3 is amplified and drives the screw shaft 200 of the ball screw 1 to rotate.
  • the other axial end of the ball screw 1 is connected to the piston 4, which is arranged inside the housing 5 and reciprocates along the axial direction A.
  • the reducer 2 uses a two-stage planetary reducer to provide a higher reduction ratio.
  • the housing 5 is provided with a plurality of oil outlets 51, so that the high-pressure oil in the housing 5 can be discharged through the oil outlets 51.
  • the piston 4 moves in the direction of the arrow X1 (i.e., the left direction in FIG. 7 )
  • the piston 4 squeezes the brake oil inside the housing 5 and outputs it to the brake valve side through the oil outlet 51;
  • the piston 4 moves in the direction of the arrow X2 (i.e., the right direction in FIG. 7 )
  • the piston 4 releases the pressure of the brake oil inside the housing 5, so that the pressure inside the housing 5 is reduced.
  • the sleeve 10 is fixedly connected to the piston 4, so that the piston 4 can move with the sleeve 10 in the axial direction A relative to the screw shaft 200.
  • the outer side of the sleeve 10 is provided with a thread, which is connected with the thread inside the piston 4 to achieve a fixed connection between the two.
  • the sleeve 10 can also form an interference connection with the piston 4 by means of a gear connection, so that the two are fixedly connected in both the axial direction A and the circumferential direction C.
  • the electro-hydraulic brake device may also be provided with an anti-rotation pin 6 , which is arranged radially outside the piston 4 to prevent the piston 4 and the sleeve 10 from circumferentially rotating.
  • At least one sealing ring is provided between the housing 5 and the piston 4.
  • two sealing rings are provided between the housing 5 and the piston 4, namely, a main sealing ring 52 and a secondary sealing ring 53.
  • the radial outer sides of the main sealing ring 52 and the secondary sealing ring 53 are fixed to the housing 5, and the radial inner sides of the main sealing ring 52 and the secondary sealing ring 53 are in contact with the radial outer side of the piston 4 and can move relatively.
  • the housing 5 is provided with a fluid replenishing hole 54, through which the brake oil can be replenished in the housing 5. Furthermore, the fluid replenishing hole 54 is located between the primary sealing ring 52 and the secondary sealing ring 53 on the housing 5, so that leakage of the brake oil can be effectively prevented.
  • the electro-hydraulic brake device further includes a thrust bearing 8.
  • the thrust bearing 8 is arranged on the radially outer side of the screw shaft 200.
  • the inner ring 81 of the thrust bearing 8 is fixedly connected to the reducer 2 and is fixedly connected to the screw shaft 200 (for example, by means of interference fit) so that the inner ring 81 and the screw shaft 200 are relatively stopped in the axial direction A and the circumferential direction C, and the torque of the reducer 2 is transmitted to the screw shaft 200 through the inner ring 81.
  • the outer ring 82 of the thrust bearing 8 is fixedly connected to the housing 5 so that the outer ring 82 and the housing 5 are relatively stopped at least in the axial direction A. In this way, when the sleeve 10 reciprocates relative to the screw shaft 200 along the axial direction A, the piston 4 can reciprocate relative to the housing 5 along the axial direction A.
  • the outer ring 82 of the thrust bearing 8 may be directly fixedly connected to the housing 5 (for example, by interference fit). In some other embodiments, the outer ring 82 may also be fixedly connected to the housing 5 through other components.
  • the electro-hydraulic brake device further includes a snap ring 7.
  • the snap ring 7 is fixedly connected to the outer ring 82, and the snap ring 7 is fixedly connected to the housing 5, so that the snap ring 7 stops the housing 5 in the axial direction A.
  • the snap ring 7 includes an interference fit portion 71 and a snap ring portion 72.
  • the interference fit portion 71 is connected to the outer ring 82 and the housing 5 by interference fit;
  • the snap ring portion 72 is snap-fitted with the housing 5 and welded to the interference fit portion to achieve a fixed connection between the snap ring 7 and the housing 5 and the outer ring 82.
  • the fixed connection between the snap ring 7 and the outer ring 82 and the fixed connection between the snap ring 7 and the housing 5 can also be achieved by other methods such as interference fit, welding, snap-fitting, etc., which are not limited here.
  • plural refers to two or more than two, and other quantifiers are similar.
  • “And/or” describes the association relationship of associated objects, indicating that three relationships may exist.
  • a and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone.
  • the character “/” generally indicates that the associated objects before and after are in an “or” relationship.
  • the singular forms “a”, “the” and “the” are also intended to include plural forms, unless the context clearly indicates other meanings.
  • first, second, etc. are used to describe various structures, but these structures should not be limited to these terms. These terms are only used to distinguish structures of the same type from each other, and do not indicate a specific order or importance. In fact, the expressions “first”, “second”, etc. can be used interchangeably. For example, without departing from the scope of the present invention, a first structure may also be referred to as a second structure, and similarly, a second structure may also be referred to as a first structure.
  • connection includes a direct connection without other components between the two, and also includes an indirect connection with other components between the two.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Transmission Devices (AREA)

Abstract

Provided are a ball screw nut (100), a ball screw (1), and an electro-hydraulic braking device. The ball screw nut (100) comprises: a sleeve (10), the sleeve (10) being provided with accommodating holes (11) penetrating in a radial direction (R); retainers (20) fixed in the accommodating holes (11), the retainers (20) being each provided with an accommodating cavity (21); first balls (30) rollably embedded in the accommodating cavities (21) of the retainers (20) and partially protruding out of the inner wall of the sleeve (10); and second balls (40) located between the first balls (30) and the inner walls of the accommodating cavities (21) of the retainers (20) and used for rolling the first balls (30) relative to the retainers (20). By means of the retainers (20), the height of the first balls (30) protruding out of the inner wall of the sleeve (10) can be adjusted, the adaptability is high, and the first balls (30) implement non-cyclic rolling. The accommodating holes (11) are easy to form, and the first balls (30) are also easy to mount by means of the retainers (20), thereby reducing the costs of production, mounting, and maintenance. The second balls (40) are provided, thereby reducing the friction force between the first balls (30) and the inner walls of the retainers (20), and further prolonging the service life of the ball screw nut (100).

Description

滚珠丝杠螺母、滚珠丝杠以及电液制动设备Ball screw nuts, ball screws and electro-hydraulic brake equipment 技术领域Technical Field
本发明涉及传动装置技术领域，尤其涉及一种滚珠丝杠螺母、滚珠丝杠以及电液制动设备。The present invention relates to the technical field of transmission devices, and in particular to a ball screw nut, a ball screw and an electro-hydraulic brake device.
背景技术Background technique
在电动汽车中，没有内燃机提供真空动力来进行制动。因此电动汽车使用带有电机的线控制动(BBW)***，电机将为制动***提供液压高压，实现制动。目前，带滚珠丝杠的液压泵被广泛用于此类制动***中。滚珠丝杠可以将电机的旋转转化为直线运动。电机带动活塞轴向运动，将制动油压入，高压油通过电磁阀单元被推向制动钳侧。In electric vehicles, there is no internal combustion engine to provide vacuum power for braking. Therefore, electric vehicles use a brake-by-wire (BBW) system with an electric motor, which will provide hydraulic high pressure to the brake system to achieve braking. At present, hydraulic pumps with ball screws are widely used in such braking systems. The ball screw can convert the rotation of the motor into linear motion. The motor drives the piston to move axially, pressurizing the brake oil, and the high-pressure oil is pushed to the brake caliper side through the solenoid valve unit.
滚珠丝杠是将回转运动转化为直线运动，或将直线运动转化为回转运动的结构。滚珠丝杆的工作原理是把原来的滑动磨擦利用滚珠的滚动变成滚动磨擦，因此其磨擦系数大大降低，从而提高了传动效率。The ball screw is a structure that converts rotary motion into linear motion, or converts linear motion into rotary motion. The working principle of the ball screw is to convert the original sliding friction into rolling friction by using the rolling of the balls, so its friction coefficient is greatly reduced, thereby improving the transmission efficiency.
相关技术中，滚珠丝杠包括丝杠轴、螺母以及滚珠。丝杠轴的外表面与螺母的内表面形成螺旋滚道，滚珠填满螺旋滚道并通过螺母内的循环滚道循环运行。In the related art, a ball screw includes a screw shaft, a nut and balls. The outer surface of the screw shaft and the inner surface of the nut form a spiral raceway, and the balls fill the spiral raceway and circulate through the circulating raceway in the nut.
然而，滚珠需要在螺母内循环滚动，内滚道的切槽之间的接缝处很难做得平滑，影响滚珠的平稳性，内循环均是采用反向器(具有循环滚道)实现滚珠循环，反向器和内滚道的尺寸精度要求较高，还有卡死的风险。However, the ball needs to circulate and roll inside the nut, and the joints between the grooves of the inner raceway are difficult to make smooth, which affects the stability of the ball. The internal circulation uses a reverser (with a circulating raceway) to achieve ball circulation. The dimensional accuracy requirements of the reverser and the inner raceway are high, and there is also a risk of jamming.
因此，螺母的内滚道和循环滚道制作难度大，使得滚珠丝杠螺母制造难度大、成本高，造成制造业投资非常高。Therefore, the inner raceway and the circulating raceway of the nut are difficult to manufacture, which makes the ball screw nut difficult and costly to manufacture, resulting in very high investment in the manufacturing industry.
发明内容Summary of the invention
为克服相关技术中存在的问题，本发明提供一种滚珠丝杠螺母、滚珠丝杠以及电液制动设备。In order to overcome the problems existing in the related art, the present invention provides a ball screw nut, a ball screw and an electro-hydraulic brake device.
根据本发明实施例的第一方面，本发明提供一种滚珠丝杠螺母，其特征在于，包括：套筒，所述套筒设置有沿径向贯通的容纳孔；保持架，固定于所述容纳孔内，所述保持架设有容纳腔；第一滚珠，可滚动地嵌设于所述保持架的所述容纳腔内，并部分凸出于所述套筒的内壁；以及第二滚珠，位于所述第一滚珠与所述保持架的所述容纳腔的内壁之间，用于使所述第一滚珠相对于所述保持架滚动。According to a first aspect of an embodiment of the present invention, the present invention provides a ball screw nut, characterized in that it includes: a sleeve, the sleeve is provided with a receiving hole extending radially therethrough; a retaining frame fixed in the receiving hole, the retaining frame being provided with a receiving cavity; a first ball, rollably embedded in the receiving cavity of the retaining frame and partially protruding from an inner wall of the sleeve; and a second ball, located between the first ball and the inner wall of the receiving cavity of the retaining frame, for enabling the first ball to roll relative to the retaining frame.
在一些实施例中，所述容纳孔内设置有凸台，使所述容纳孔呈阶梯状；所述保持架的径向外侧延伸设置有凸缘，所述凸缘沿径向部分或全部覆盖所述凸台。In some embodiments, a boss is provided in the receiving hole, so that the receiving hole is stepped; a flange is extended from the radial outer side of the retaining frame, and the flange partially or completely covers the boss in the radial direction.
在一些实施例中，所述保持架可在所述容纳孔内沿径向调整径向位置，通过调整所述保持架在所述容纳孔内的径向位置，以调整所述第一滚珠凸出于所述套筒的内壁的高度。In some embodiments, the retaining frame can adjust the radial position in the receiving hole along the radial direction, and the height of the first ball protruding from the inner wall of the sleeve can be adjusted by adjusting the radial position of the retaining frame in the receiving hole.
在一些实施例中，所述滚珠丝杠螺母还包括调整环，用于卡套在所述保持架的外部，用于固定所述保持架在所述容纳孔内的径向位置；其中，所述调整环的径向外侧与所述保持架的凸缘抵接，所述调整环的径向内侧与所述容纳孔的所述凸台抵接。In some embodiments, the ball screw nut also includes an adjusting ring, which is used to be clamped on the outside of the retaining frame to fix the radial position of the retaining frame in the receiving hole; wherein the radial outer side of the adjusting ring abuts against the flange of the retaining frame, and the radial inner side of the adjusting ring abuts against the boss of the receiving hole.
在一些实施例中，所述保持架的径向内侧设有弯曲挡板，所述弯曲挡板使所述容纳腔的开口直径小于所述第一滚珠的直径。In some embodiments, a curved baffle is provided on the radial inner side of the retaining frame, and the curved baffle makes the opening diameter of the accommodating cavity smaller than the diameter of the first ball.
在一些实施例中，所述第二滚珠的直径小于所述第一滚珠的直径。In some embodiments, the diameter of the second ball is smaller than the diameter of the first ball.
在一些实施例中，所述套筒设有多个所述容纳孔，且多个所述容纳孔沿所述套筒的周向间隔设置且呈螺旋形排列。In some embodiments, the sleeve is provided with a plurality of the accommodating holes, and the plurality of the accommodating holes are spaced apart along the circumference of the sleeve and arranged in a spiral shape.
在一些实施例中，所述保持架的每个所述容纳腔内设置有多个第二滚珠。In some embodiments, a plurality of second balls are disposed in each of the accommodating cavities of the retaining frame.
根据本发明实施例的第二方面，本发明提供一种滚珠丝杠，包括：丝杠轴，所述丝杠轴的外壁设置有螺旋槽；以及如第一方面所述的滚珠丝杠螺母，所述滚珠丝杠螺母套设在所述丝杠轴的外部；其中，所述第一滚珠沿所述螺旋槽滚动，且轴向相邻的两个所述第一滚珠的珠心间距大于相邻两个所述螺旋槽的槽距。According to a second aspect of an embodiment of the present invention, the present invention provides a ball screw, comprising: a screw shaft, the outer wall of which is provided with a spiral groove; and a ball screw nut as described in the first aspect, wherein the ball screw nut is sleeved on the outside of the screw shaft; wherein the first ball rolls along the spiral groove, and the distance between the ball centers of two axially adjacent first balls is greater than the groove distance of two adjacent spiral grooves.
根据本发明实施例的第三方面，本发明提供一种电液制动设备，包 括：如第二方面所述的滚珠丝杠、减速器、电机、活塞和壳体；所述电机经由所述减速器连接到所述滚珠丝杠的轴向一端，所述滚珠丝杠的轴向的另一端连接有所述活塞，所述活塞设置于所述壳体的内部沿轴向做往复运动。According to a third aspect of an embodiment of the present invention, the present invention provides an electro-hydraulic brake device, comprising: a ball screw, a reducer, a motor, a piston and a housing as described in the second aspect; the motor is connected to one axial end of the ball screw via the reducer, the other axial end of the ball screw is connected to the piston, and the piston is arranged inside the housing to reciprocate axially.
本发明的实施例提供的技术方案可以包括以下有益效果：The technical solution provided by the embodiments of the present invention may have the following beneficial effects:
通过容纳孔、保持架以及第二滚珠的配合，可以使第一滚珠在螺母上实现非循环滚动，避免在螺母内进行内循环，出现卡死的风险；Through the cooperation of the receiving hole, the retaining frame and the second ball, the first ball can realize non-circulating rolling on the nut, avoiding the risk of internal circulation in the nut and causing jamming;
容纳孔便于加工，第一滚珠通过保持架固定在容纳孔内，第一滚珠也易固定和安装，减少了零件数量，还便于拆卸和更换，降低了生产、安装和维护的成本；The receiving hole is easy to process, and the first ball is fixed in the receiving hole through the retaining frame. The first ball is also easy to fix and install, which reduces the number of parts, is easy to disassemble and replace, and reduces the cost of production, installation and maintenance;
通过设置保持架，可以通过调节保持架在容纳孔径向上的位置，调节第一滚珠凸出于套筒内壁的高度，从而以获得相对于螺旋槽的深度和截面形状的最佳配合状态，使得滚珠丝杠螺母可匹配不同的丝杠轴，适配性高；以及By providing a retainer, the height of the first ball protruding from the inner wall of the sleeve can be adjusted by adjusting the position of the retainer in the radial direction of the receiving hole, so as to obtain the best matching state relative to the depth and cross-sectional shape of the spiral groove, so that the ball screw nut can match different screw shafts with high adaptability; and
通过设置第二滚珠，可以减小第一滚珠与保持架内壁之间的摩擦力，进一步延长滚珠丝杠螺母的使用寿命。By providing the second ball, the friction between the first ball and the inner wall of the retaining frame can be reduced, further extending the service life of the ball screw nut.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本发明的实施例，并与说明书一起用于解释本发明的原理。The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.
图1是根据一示例性实施例示出的滚珠丝杠螺母的立体结构示意图；FIG1 is a schematic diagram of a three-dimensional structure of a ball screw nut according to an exemplary embodiment;
图2是根据一示例性实施例示出的滚珠丝杠顺时针转动的剖视图；FIG2 is a cross-sectional view showing a ball screw rotating clockwise according to an exemplary embodiment;
图3是根据一示例性实施例示出的滚珠丝杠逆时针转动的剖视图；FIG3 is a cross-sectional view showing a ball screw rotating counterclockwise according to an exemplary embodiment;
图4是图2中局部A部的放大图；FIG4 is an enlarged view of a local portion A in FIG2 ;
图5是根据一示例性实施例示出的保持架、第一滚珠和第二滚珠的剖视图；FIG5 is a cross-sectional view of a cage, a first ball, and a second ball according to an exemplary embodiment;
图6是根据一示例性实施例示出的保持架、第一滚珠和第二滚珠的另一视角的立体图；以及FIG6 is a perspective view of a cage, a first ball, and a second ball from another perspective according to an exemplary embodiment; and
图7是根据一示例性实施例示出的电液制动设备的剖视图。FIG. 7 is a cross-sectional view of an electro-hydraulic brake device according to an exemplary embodiment.
具体实施方式Detailed ways
这里将详细地对示例性实施例进行说明，其示例表示在附图中。下面的描述涉及附图时，除非另有表示，不同附图中的相同数字表示相同或相似的要素。以下示例性实施例中所描述的实施方式并不代表与本发明相一致的所有实施方式。相反，它们仅是与如所附权利要求书中所详述的、本发明的一些方面相一致的装置和方法的例子。Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.
在本发明中，除非另有说明，否则轴向A、径向R和周向分别是指滚珠丝杠1的轴向A、径向R和周向；轴向一侧是指图1、图2和图3中的左侧，轴向另一侧是指图1、图2和图3中的右侧；径向外侧是指在径向R上远离图2和图3中的中心轴线O的那侧(图2和图3中的上侧)，径向内侧是指在径向R上接近该中心轴线O的那侧(图2和图3中的下侧)。In the present invention, unless otherwise specified, the axial direction A, radial direction R and circumferential direction refer to the axial direction A, radial direction R and circumferential direction of the ball screw 1 respectively; one axial side refers to the left side in Figures 1, 2 and 3, and the other axial side refers to the right side in Figures 1, 2 and 3; the radial outer side refers to the side away from the center axis O in Figures 2 and 3 in the radial direction R (the upper side in Figures 2 and 3), and the radial inner side refers to the side close to the center axis O in the radial direction R (the lower side in Figures 2 and 3).
根据本发明的实施例，滚珠丝杠螺母100适合安装在滚珠丝杠1中。为了更好地理解本发明，下面结合图2和图3对根据本发明的实施例的滚珠丝杠螺母100进行描述，其中，图2示出了根据本发明的实施例的滚珠丝杠1顺时针转动的剖视图，其中滚珠丝杠螺母100的轴向移动由箭头X1指示；图3示出了根据本发明的实施例的滚珠丝杠1逆时针转动的剖视图，其中滚珠丝杠螺母100的轴向移动由箭头X2指示。According to an embodiment of the present invention, the ball screw nut 100 is suitable for installation in the ball screw 1. In order to better understand the present invention, the ball screw nut 100 according to the embodiment of the present invention is described below in conjunction with Figures 2 and 3, wherein Figure 2 shows a cross-sectional view of the ball screw 1 rotating clockwise according to the embodiment of the present invention, wherein the axial movement of the ball screw nut 100 is indicated by arrow X1; Figure 3 shows a cross-sectional view of the ball screw 1 rotating counterclockwise according to the embodiment of the present invention, wherein the axial movement of the ball screw nut 100 is indicated by arrow X2.
另外，“传动联接”是指两个部件之间能够传递驱动力/扭矩，这两个部件可以直接连接也可以通过各种传动机构或连接结构以实现上述功能。术语“抗扭连接”是指两个元件之间以不相对于彼此转动的方式连接，其可以经由压配合(即过盈配合)来实现，也可以通过将所提及的两个部件一体地形成来实现。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本发明中的具体含义。In addition, "transmission connection" refers to the ability to transmit driving force/torque between two components, and the two components can be directly connected or through various transmission mechanisms or connection structures to achieve the above functions. The term "torsion-resistant connection" refers to the connection between two elements in a manner that does not rotate relative to each other, which can be achieved through a press fit (i.e., an interference fit) or by forming the two components mentioned in one piece. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.
滚珠丝杠1是一种高精度的传动装置，滚珠丝杠1包括丝杠轴200、滚珠丝杠螺母100以及滚珠，丝杠轴200的旋转使滚珠推动螺母轴向A移动，采用滚动摩擦螺旋取代滑动摩擦螺旋。The ball screw 1 is a high-precision transmission device. The ball screw 1 includes a screw shaft 200, a ball screw nut 100 and balls. The rotation of the screw shaft 200 causes the balls to push the nut axial direction A to move. A rolling friction screw is used instead of a sliding friction screw.
当丝杠轴200相对于螺母做旋转运动时，两者间发生轴向A位移，而滚珠则可沿着螺旋滚道流动，减少摩擦阻力，滚珠在丝杆上滚过数圈后， 通过回程引导装置，逐个滚回到丝杠轴200和螺母之间，构成一个闭合的回路管道。When the screw shaft 200 rotates relative to the nut, an axial displacement A occurs between the two, and the balls can flow along the spiral raceway to reduce friction resistance. After rolling on the screw for several circles, the balls pass through the return guide device and roll back one by one between the screw shaft 200 and the nut, forming a closed loop pipeline.
然而，相关技术中，滚珠需要在螺母内循环滚动，内滚道的切槽之间的接缝处很难做得平滑，影响滚珠的平稳性，内循环均是采用反向器(具有循环滚道)实现滚珠循环，反向器和内滚道的尺寸精度要求较高，还有卡死的风险。因此，螺母的内滚道和循环滚道制作难度大，使得滚珠丝杠螺母100制造难度大、成本高，造成制造业投资非常高。However, in the related art, the ball needs to circulate and roll inside the nut, and the joints between the grooves of the inner raceway are difficult to be made smooth, which affects the stability of the ball. The inner circulation uses a reverser (with a circulating raceway) to achieve ball circulation. The reverser and the inner raceway have high dimensional accuracy requirements and there is also a risk of jamming. Therefore, the inner raceway and the circulating raceway of the nut are difficult to manufacture, making the ball screw nut 100 difficult and costly to manufacture, resulting in very high investment in the manufacturing industry.
为解决上述技术问题，本发明提供一种滚珠丝杠螺母100，如图1所示，包括套筒10、保持架20、第一滚珠30和第二滚珠40。如图2和图3所示，保持架20可拆卸地固定于套筒10，第一滚珠30通过保持架20固定在套筒10并可以随套筒10一起沿轴向A移动，如此，实现第一滚珠30的非循环式轴向A移动，避免卡死的风险。另外，如图4至图6所示，第一滚珠30通过第二滚珠40可以相对于保持架20和套筒10滚动，以减小摩擦力。In order to solve the above technical problems, the present invention provides a ball screw nut 100, as shown in FIG1, comprising a sleeve 10, a retaining frame 20, a first ball 30 and a second ball 40. As shown in FIG2 and FIG3, the retaining frame 20 is detachably fixed to the sleeve 10, and the first ball 30 is fixed to the sleeve 10 through the retaining frame 20 and can move along the axial direction A with the sleeve 10, so that the non-circulating axial movement A of the first ball 30 is realized to avoid the risk of getting stuck. In addition, as shown in FIG4 to FIG6, the first ball 30 can roll relative to the retaining frame 20 and the sleeve 10 through the second ball 40 to reduce friction.
具体地，套筒10为沿轴向A延伸且贯通的筒状结构。套筒10的筒壁上设置有沿径向R贯通的容纳孔11，且每个容纳孔11内可以容纳至少一个第一滚珠30，当丝杠轴200旋转并通过第一滚珠30推动套筒10轴向A移动时，容纳孔11的孔壁限制了第一滚珠30沿套筒10的周向运动，使第一滚珠30只能在容纳孔11内转动，并随套筒10一起轴向A运动。Specifically, the sleeve 10 is a cylindrical structure extending and penetrating along the axial direction A. The sleeve 10 has a receiving hole 11 penetrating along the radial direction R on its wall, and each receiving hole 11 can accommodate at least one first ball 30. When the screw shaft 200 rotates and pushes the sleeve 10 to move in the axial direction A through the first ball 30, the hole wall of the receiving hole 11 limits the circumferential movement of the first ball 30 along the sleeve 10, so that the first ball 30 can only rotate in the receiving hole 11 and move in the axial direction A with the sleeve 10.
进一步地，如图4所示，保持架20固定于容纳孔11内，保持架20设有容纳腔21，第一滚珠30可滚动地嵌设于保持架20的容纳腔21内，并部分凸出于套筒10的内壁。Further, as shown in FIG. 4 , the retainer 20 is fixed in the receiving hole 11 , and the retainer 20 is provided with a receiving cavity 21 . The first ball 30 is rollably embedded in the receiving cavity 21 of the retainer 20 and partially protrudes from the inner wall of the sleeve 10 .
具体地，保持架20的容纳腔21为具有开口的容纳腔21，开口位于保持架20的径向内侧，第一滚珠30位于容纳腔21内，开口直径V1小于第一滚珠30的直径D1，如此使得第一滚珠30能够保持在保持架20内且不脱离于保持架20，同时开口还能使第一滚珠30在保持架20的径向内侧凸出于保持架20，当保持架20固定于套筒10的容纳孔11内时，第一滚珠30又可以凸出于套筒10的内壁，与丝杠轴200外壁的螺旋槽50抵接。Specifically, the accommodating cavity 21 of the retaining frame 20 is an accommodating cavity 21 with an opening, and the opening is located on the radial inner side of the retaining frame 20. The first ball 30 is located in the accommodating cavity 21. The opening diameter V1 is smaller than the diameter D1 of the first ball 30, so that the first ball 30 can be retained in the retaining frame 20 and does not separate from the retaining frame 20. At the same time, the opening can also make the first ball 30 protrude from the retaining frame 20 on the radial inner side of the retaining frame 20. When the retaining frame 20 is fixed in the accommodating hole 11 of the sleeve 10, the first ball 30 can protrude from the inner wall of the sleeve 10 and abut against the spiral groove 50 on the outer wall of the screw shaft 200.
需要说明的是，保持架20的容纳腔21的大小可以不同，例如，可以 根据第一滚珠30的直径大小以及预设的第一滚珠30凸出于保持架20的高度，选择对应容纳腔21大小的保持架20。It should be noted that the size of the accommodating cavity 21 of the retaining frame 20 can be different. For example, the retaining frame 20 with a corresponding size of the accommodating cavity 21 can be selected according to the diameter of the first ball 30 and the preset height of the first ball 30 protruding from the retaining frame 20.
保持架20固定于容纳孔11内，即保持架20不能相对于容纳孔11进行轴向移动或周向转动，实现保持架20与容纳孔11的抗扭连接。The retaining frame 20 is fixed in the receiving hole 11 , that is, the retaining frame 20 cannot move axially or rotate circumferentially relative to the receiving hole 11 , thereby achieving a torsion-resistant connection between the retaining frame 20 and the receiving hole 11 .
在一些实施例中，保持架20可以与容纳孔11过盈配合实现抗扭连接；在另一些实施例中，保持架20与容纳孔11可以通过键与键槽的方式实现抗扭连接，键与键槽分别设置在保持架20的外壁和容纳孔11的内壁的其中之一；在另一些实施例中，保持架20与容纳孔11可以通过螺纹连接，并通过固定件实现抗扭连接，在此不一一列举。In some embodiments, the retaining frame 20 can be interference fit with the receiving hole 11 to achieve a torsion-resistant connection; in other embodiments, the retaining frame 20 and the receiving hole 11 can be torsion-resistant connected by means of a key and a keyway, and the key and the keyway are respectively arranged on the outer wall of the retaining frame 20 and one of the inner walls of the receiving hole 11; in other embodiments, the retaining frame 20 and the receiving hole 11 can be connected by threads and torsion-resistant connection can be achieved by fixing parts, which are not listed here one by one.
进一步地，第二滚珠40位于第一滚珠30与保持架20的容纳腔21的内壁之间，用于使第一滚珠30相对保持架20滚动。通过设置第二滚珠40，可以减小第一滚珠30与保持架20内壁之间的摩擦力，进一步延长滚珠丝杠螺母100的使用寿命。Furthermore, the second ball 40 is located between the first ball 30 and the inner wall of the accommodating cavity 21 of the cage 20, and is used to make the first ball 30 roll relative to the cage 20. By providing the second ball 40, the friction between the first ball 30 and the inner wall of the cage 20 can be reduced, and the service life of the ball screw nut 100 can be further extended.
其中，第二滚珠40的直径小于第一滚珠30的直径D1。具体地，在本实施例中，第二滚珠40的直径可以为第一滚珠30的直径D1的六分之一。进一步地，保持架20的每个容纳腔21内设置有多个第二滚珠40。多个直径远小于第一滚珠30的第二滚珠40覆盖第一滚珠30位于容纳腔21内的外表面，使第一滚珠30与保持架20的容纳腔21的内壁完全隔离，且使第一滚珠30相对于保持架20滚动时受力更加均匀，避免第二滚珠40与保持架20的接触和摩擦。The diameter of the second ball 40 is smaller than the diameter D1 of the first ball 30. Specifically, in the present embodiment, the diameter of the second ball 40 may be one sixth of the diameter D1 of the first ball 30. Furthermore, a plurality of second balls 40 are arranged in each accommodating cavity 21 of the retaining frame 20. The plurality of second balls 40 having a diameter much smaller than that of the first ball 30 cover the outer surface of the first ball 30 located in the accommodating cavity 21, so that the first ball 30 is completely isolated from the inner wall of the accommodating cavity 21 of the retaining frame 20, and the first ball 30 is subjected to a more uniform force when rolling relative to the retaining frame 20, so as to avoid contact and friction between the second ball 40 and the retaining frame 20.
进一步地，在一些实施例中，套筒10设有多个容纳孔11，且多个容纳孔11沿套筒10的周向间隔设置且呈螺旋形排列。Furthermore, in some embodiments, the sleeve 10 is provided with a plurality of accommodating holes 11 , and the plurality of accommodating holes 11 are spaced apart along the circumference of the sleeve 10 and arranged in a spiral shape.
在本实施例的示例图中，如图2至图6所示，每个容纳孔11内只容纳一个保持架20，且每个保持架20也只设置有一个容纳腔21，每个容纳腔21内容纳一个第一滚珠30以及多个第二滚珠40。且多个容纳孔11沿套筒10的轴向A间隔设置且呈螺旋形排列，使得多个容纳孔11内的多个第一滚珠30的排列轨迹与丝杠轴200外壁的螺旋槽50相匹配。In the example diagrams of this embodiment, as shown in FIGS. 2 to 6 , each receiving hole 11 only receives one retainer 20, and each retainer 20 is also provided with only one receiving cavity 21, and each receiving cavity 21 receives one first ball 30 and a plurality of second balls 40. The plurality of receiving holes 11 are arranged at intervals along the axial direction A of the sleeve 10 and are arranged in a spiral shape, so that the arrangement tracks of the plurality of first balls 30 in the plurality of receiving holes 11 match the spiral groove 50 on the outer wall of the screw shaft 200.
由上可知，相对于在套筒10的内壁加工内滚道以及循环滚道而言，在套筒10上加工容纳孔11的工艺更加简单，因此，可以节省零件成本、 制造投资以及加工工艺成本。第一滚珠30滚动安装于保持架20的容纳腔21内，安装也更加方便，第一滚珠30与保持架20作为整体固定在容纳孔11内，在第一滚珠30出现磨损等问题需要维护或更换时，只需取出相应地保持架20即可，因此独立的保持架20结构，不仅使得第一滚珠30易固定和安装，还便于拆卸和更换，降低了生产、安装和维护的成本。As can be seen from the above, compared with processing the inner raceway and the circulating raceway on the inner wall of the sleeve 10, the process of processing the receiving hole 11 on the sleeve 10 is simpler, so it can save the cost of parts, manufacturing investment and processing technology cost. The first ball 30 is rolled and installed in the receiving cavity 21 of the retainer 20, and the installation is also more convenient. The first ball 30 and the retainer 20 are fixed in the receiving hole 11 as a whole. When the first ball 30 has problems such as wear and needs maintenance or replacement, it is only necessary to take out the corresponding retainer 20. Therefore, the independent retainer 20 structure not only makes the first ball 30 easy to fix and install, but also easy to disassemble and replace, reducing the cost of production, installation and maintenance.
另外，容纳孔11可以呈圆形、方形、三角形等任意形状，保持架20的外壁轮廓形状可以与容纳孔11的内壁轮廓形状相匹配，在此不一一列举。In addition, the receiving hole 11 can be in any shape such as circular, square, triangular, etc., and the outer wall contour shape of the retaining frame 20 can match the inner wall contour shape of the receiving hole 11, which are not listed here one by one.
进一步地，由上述内容可知，保持架20与容纳孔11抗扭连接，在本实施例中，容纳孔11为阶梯孔，包括位于径向内侧的内孔以及位于径向外侧的外孔，外孔的直径大于内孔的直径，因此内孔与外孔之间形成有凸台111，使得容纳孔11呈阶梯状。Furthermore, it can be seen from the above content that the retaining frame 20 is torsionally connected to the receiving hole 11. In the present embodiment, the receiving hole 11 is a stepped hole, including an inner hole located radially inwardly and an outer hole located radially outwardly. The diameter of the outer hole is larger than the diameter of the inner hole. Therefore, a boss 111 is formed between the inner hole and the outer hole, making the receiving hole 11 stepped.
同时，保持架20的径向外侧(即远离开口的一侧)沿轴向A延伸并形成凸缘22，凸缘22沿径向R部分或全部覆盖凸台111，即凸缘22的外径大于内孔的直径，且等于或小于外孔的直径。At the same time, the radial outer side of the retaining frame 20 (i.e., the side away from the opening) extends along the axial direction A and forms a flange 22, which partially or completely covers the boss 111 along the radial direction R, that is, the outer diameter of the flange 22 is larger than the diameter of the inner hole and equal to or smaller than the diameter of the outer hole.
保持架20的外壁可以与容纳孔11的内孔过盈配合，或通过键和键槽配合，或通过螺纹配合，如此可以防止保持架20脱离套筒10。保持架20的凸缘22可以与凸台111抵接，凸台111可以用于限定保持架20在容纳孔11内沿径向R上的最低位置，防止保持架20朝丝杠轴200方向移动，使第一滚珠30过渡压迫丝杠轴200的螺旋槽50。The outer wall of the retainer 20 can be interference fit with the inner hole of the receiving hole 11, or through key and keyway fit, or through thread fit, so that the retainer 20 can be prevented from being separated from the sleeve 10. The flange 22 of the retainer 20 can abut against the boss 111, and the boss 111 can be used to limit the lowest position of the retainer 20 in the receiving hole 11 along the radial direction R, preventing the retainer 20 from moving toward the screw shaft 200, so that the first ball 30 transitionally presses the spiral groove 50 of the screw shaft 200.
进一步地，保持架20在容纳孔11内不能相对于容纳孔11进行转动，但在一些实施例中，保持架20在容纳孔11内可以沿径向R移动，通过调整保持架20在容纳孔11内的径向位置，以调整第一滚珠30凸出于套筒10的内壁的高度H。由此，设定第二滚珠40从套筒10的径向内侧的突出量，以获得相对于丝杠轴200的螺旋槽50的深度和截面形状的最佳配合状态，使得滚珠丝杠螺母100可匹配不同槽宽V2的螺旋槽50的丝杠轴200，通用性及适配性高。Further, the retainer 20 cannot rotate relative to the receiving hole 11 in the receiving hole 11, but in some embodiments, the retainer 20 can move in the radial direction R in the receiving hole 11, and the height H of the first ball 30 protruding from the inner wall of the sleeve 10 is adjusted by adjusting the radial position of the retainer 20 in the receiving hole 11. Thus, the protrusion amount of the second ball 40 from the radial inner side of the sleeve 10 is set to obtain the best matching state with respect to the depth and cross-sectional shape of the spiral groove 50 of the screw shaft 200, so that the ball screw nut 100 can match the screw shaft 200 with the spiral groove 50 of different groove widths V2, and has high versatility and adaptability.
在一些实施例中，滚珠丝杠螺母100还包括调整环(图中未示出)，用于卡套在保持架20的外部，用于固定保持架20在容纳孔11内的径向位 置；其中，调整环的径向外侧与保持架20的凸缘22抵接，调整环的径向内侧与容纳孔11的凸台111抵接。In some embodiments, the ball screw nut 100 also includes an adjusting ring (not shown in the figure), which is used to be clamped on the outside of the retaining frame 20 to fix the radial position of the retaining frame 20 in the receiving hole 11; wherein the radial outer side of the adjusting ring abuts against the flange 22 of the retaining frame 20, and the radial inner side of the adjusting ring abuts against the boss 111 of the receiving hole 11.
具体地，调整环可以为C形卡环，C形卡环卡套在保持架20的外部，在将保持架20调整至容纳孔11的预设位置后，将C形卡环卡套在保持架20的外部，且使C形卡环的径向外侧与保持架20的凸缘22抵接，C形卡环的径向内侧与容纳孔11的凸台111抵接。Specifically, the adjustment ring can be a C-shaped snap ring, which is clamped on the outside of the retaining frame 20. After the retaining frame 20 is adjusted to the preset position of the receiving hole 11, the C-shaped snap ring is clamped on the outside of the retaining frame 20, and the radial outer side of the C-shaped snap ring abuts against the flange 22 of the retaining frame 20, and the radial inner side of the C-shaped snap ring abuts against the boss 111 of the receiving hole 11.
C形卡环可以备用多个，即沿径向R上的厚度不同。可以根据保持架20在容纳孔11内的径向位置选择相应厚度的C形卡环，或根据保持架20在容纳孔11内的径向位置，选择厚度相同的多个C型卡环进行叠罗。如此，只需拆卸或卡套C形卡环，即可调整保持架20的径向位置或将保持架20固定在对应的径向位置。使保持架20在容纳孔11内的径向位置的调节更加方便快捷。There can be multiple C-shaped snap rings, that is, the thickness along the radial direction R is different. According to the radial position of the retainer 20 in the receiving hole 11, a C-shaped snap ring of corresponding thickness can be selected, or according to the radial position of the retainer 20 in the receiving hole 11, multiple C-shaped snap rings of the same thickness can be selected for stacking. In this way, the radial position of the retainer 20 can be adjusted or the retainer 20 can be fixed at the corresponding radial position by simply removing or clamping the C-shaped snap ring. This makes the adjustment of the radial position of the retainer 20 in the receiving hole 11 more convenient and quick.
进一步地，还可以在保持架20的外壁设置有刻度线(图中未示出)，每个刻度线对应第一滚珠30凸出于套筒10内壁的高度(也可以称为突出量)，使保持架20的径向位置调节更加准确，避免第一滚珠30与丝杠轴200的螺旋槽50的内壁的过渡径向R挤压或接触不够，影响滚珠丝杠1的传动性能。Furthermore, scale lines (not shown in the figure) can be provided on the outer wall of the retaining frame 20, and each scale line corresponds to the height of the first ball 30 protruding from the inner wall of the sleeve 10 (also referred to as the protrusion amount), so that the radial position adjustment of the retaining frame 20 is more accurate, avoiding the transition radial R extrusion or insufficient contact between the first ball 30 and the inner wall of the spiral groove 50 of the screw shaft 200, which affects the transmission performance of the ball screw 1.
在一些实施例中，如图5和图6所示，保持架20的径向内侧设有弯曲挡板23，弯曲挡板23使容纳腔21的开口直径V1小于第一滚珠30的直径。在第二滚珠40和第一滚珠30安装入保持架20的容纳腔21内后，使弯曲挡板23沿第一滚珠30的球心的方向折弯，以形成容纳腔21的开口，且开口直径V1小于第一滚珠30的直径D1，避免第一滚珠30脱离保持架20。In some embodiments, as shown in FIG5 and FIG6 , a curved baffle 23 is provided on the radial inner side of the retainer 20, and the curved baffle 23 makes the opening diameter V1 of the accommodating cavity 21 smaller than the diameter of the first ball 30. After the second ball 40 and the first ball 30 are installed in the accommodating cavity 21 of the retainer 20, the curved baffle 23 is bent along the direction of the ball center of the first ball 30 to form an opening of the accommodating cavity 21, and the opening diameter V1 is smaller than the diameter D1 of the first ball 30, so as to prevent the first ball 30 from escaping from the retainer 20.
由此可知，也可以通过弯折弯曲挡板23的弯曲角度，限定容纳腔21开口直径V1大小，从而控制第一滚珠30凸出于套筒10内壁的突出量，以获得相对于丝杠轴200的螺旋槽50的深度和截面形状的最佳配合状态，进一步地使得滚珠丝杠螺母100可匹配不同槽宽V2的螺旋槽50的丝杠轴200，提高滚珠丝杠螺母100的通用性及适配性。It can be seen from this that the size of the opening diameter V1 of the accommodating cavity 21 can also be limited by bending the bending angle of the bending baffle 23, thereby controlling the protrusion of the first ball 30 from the inner wall of the sleeve 10, so as to obtain the best matching state of the depth and cross-sectional shape of the spiral groove 50 relative to the screw shaft 200, and further enable the ball screw nut 100 to match the screw shaft 200 with the spiral groove 50 of different groove widths V2, thereby improving the versatility and adaptability of the ball screw nut 100.
基于相同的发明构思，本发明提供一种滚珠丝杠1，如图2和图3所 示，包括丝杠轴200以及上述的滚珠丝杠螺母100，滚珠丝杠螺母100套设在丝杠轴200的外部。Based on the same inventive concept, the present invention provides a ball screw 1, as shown in Figures 2 and 3, including a screw shaft 200 and the above-mentioned ball screw nut 100, and the ball screw nut 100 is sleeved on the outside of the screw shaft 200.
其中，丝杠轴200的外壁设置有螺旋槽50；第一滚珠30沿螺旋槽50滚动，且轴向A相邻的两个第一滚珠30的珠心间距W1大于相邻两个螺旋槽50的槽距W2。在产生相同压力的情况下，丝杠轴200不需要旋转那么多圈，且丝杠轴200的旋转速度相对较低，不仅增加扭矩，还可以减少旋转噪音和磨损。The outer wall of the screw shaft 200 is provided with a spiral groove 50; the first ball 30 rolls along the spiral groove 50, and the ball center distance W1 of two adjacent first balls 30 in the axial direction A is greater than the groove distance W2 of two adjacent spiral grooves 50. When the same pressure is generated, the screw shaft 200 does not need to rotate so many times, and the rotation speed of the screw shaft 200 is relatively low, which not only increases the torque, but also reduces the rotation noise and wear.
如图2所示，示出的为滚珠丝杠1顺时针转动的剖视图。As shown in FIG. 2 , a cross-sectional view of the ball screw 1 rotating clockwise is shown.
当丝杠轴200顺时针旋转时，丝杠轴200的螺旋槽50通过第一滚珠30推动滚珠丝杠螺母100沿轴向A向左移动。此时，第一滚珠30通过第二滚珠40相对于保持架20和套筒10滚动，且随套筒10一起沿着轴向A运动，实现非循环滚动。When the screw shaft 200 rotates clockwise, the spiral groove 50 of the screw shaft 200 pushes the ball screw nut 100 to move leftward along the axial direction A through the first ball 30. At this time, the first ball 30 rolls relative to the retainer 20 and the sleeve 10 through the second ball 40, and moves along the axial direction A with the sleeve 10, realizing non-circular rolling.
如图3所示，示出的为滚珠丝杠1逆时针转动的剖视图。As shown in FIG. 3 , a cross-sectional view of the ball screw 1 rotating counterclockwise is shown.
当丝杠轴200逆时针旋转时，丝杠轴200的螺旋槽50通过第一滚珠30带动滚珠丝杠螺母100沿轴线向右移动。此时，第一滚珠30通过第二滚珠40相对于保持架20和套筒10滚动，且随套筒10一起沿着轴向A运动，实现非循环滚动。When the screw shaft 200 rotates counterclockwise, the spiral groove 50 of the screw shaft 200 drives the ball screw nut 100 to move rightward along the axis through the first ball 30. At this time, the first ball 30 rolls relative to the retainer 20 and the sleeve 10 through the second ball 40, and moves along the axial direction A with the sleeve 10, realizing non-circular rolling.
关于上述实施例中的滚珠丝杠1中实现的功能的具体方式已经在有关该滚珠丝杠螺母100的实施例中进行了详细描述，此处将不做详细阐述说明。The specific manner in which the functions implemented in the ball screw 1 in the above embodiment have been described in detail in the embodiment of the ball screw nut 100, and will not be elaborated here.
基于相同的发明构思，本发明提供一种电液制动设备。图7根据示例性实施例示出了电液制动设备的剖视图。所述电液制动设备包括：滚珠丝杠1、减速器2、电机3、活塞4和壳体5。Based on the same inventive concept, the present invention provides an electro-hydraulic brake device. Fig. 7 shows a cross-sectional view of an electro-hydraulic brake device according to an exemplary embodiment. The electro-hydraulic brake device comprises: a ball screw 1, a reducer 2, a motor 3, a piston 4 and a housing 5.
如图7所示，所述电机3经由所述减速器2连接到所述滚珠丝杠1的轴向一端，通过所述减速器2，电机3的扭矩将放大并驱动所述滚珠丝杠1的丝杠轴200旋转。所述滚珠丝杠1的轴向的另一端连接有所述活塞4，所述活塞4设置于所述壳体5的内部，并且沿轴向A做往复运动。As shown in FIG7 , the motor 3 is connected to one axial end of the ball screw 1 via the reducer 2. Through the reducer 2, the torque of the motor 3 is amplified and drives the screw shaft 200 of the ball screw 1 to rotate. The other axial end of the ball screw 1 is connected to the piston 4, which is arranged inside the housing 5 and reciprocates along the axial direction A.
在一些实施例中，所述减速器2采用二级行星减速机能够提供更高的减速比。In some embodiments, the reducer 2 uses a two-stage planetary reducer to provide a higher reduction ratio.
所述壳体5上设置有多个出油口51，以使所述壳体5内的高压油可通过所述出油口51出油。当所述活塞4朝向箭头X1的方向(即图7中的左侧方向)运动时，所述活塞4挤压壳体5内部的制动油，并通过出油口51输出到制动阀侧；当所述活塞4朝向箭头X2的方向(即图7中的右侧方向)运动时，所述活塞4释放壳体5内部的制动油的压力，使得所述壳体5内部的压力降低。The housing 5 is provided with a plurality of oil outlets 51, so that the high-pressure oil in the housing 5 can be discharged through the oil outlets 51. When the piston 4 moves in the direction of the arrow X1 (i.e., the left direction in FIG. 7 ), the piston 4 squeezes the brake oil inside the housing 5 and outputs it to the brake valve side through the oil outlet 51; when the piston 4 moves in the direction of the arrow X2 (i.e., the right direction in FIG. 7 ), the piston 4 releases the pressure of the brake oil inside the housing 5, so that the pressure inside the housing 5 is reduced.
具体地，所述套筒10与所述活塞4固定连接，因而，所述活塞4能够随着所述套筒10在轴向A上相对于所述丝杠轴200运动。可选地，所述套筒10的外侧设置有螺纹，与所述活塞4内侧的螺纹对接，以实现二者之间的固定连接。可选地，所述套筒10也可以通过齿接的方式与活塞4形成过盈连接，使得两者在轴向A和周向C都形成固定连接。Specifically, the sleeve 10 is fixedly connected to the piston 4, so that the piston 4 can move with the sleeve 10 in the axial direction A relative to the screw shaft 200. Optionally, the outer side of the sleeve 10 is provided with a thread, which is connected with the thread inside the piston 4 to achieve a fixed connection between the two. Optionally, the sleeve 10 can also form an interference connection with the piston 4 by means of a gear connection, so that the two are fixedly connected in both the axial direction A and the circumferential direction C.
此外，所述电液制动设备还可以设有防转销6，所述防转销6设置于所述活塞4径向外侧，防止活塞4和套筒10周向转动。In addition, the electro-hydraulic brake device may also be provided with an anti-rotation pin 6 , which is arranged radially outside the piston 4 to prevent the piston 4 and the sleeve 10 from circumferentially rotating.
所述壳体5与所述活塞4之间设置有至少一个密封环。如图7所示，在一些实施例中，所述壳体5与所述活塞4之间设置有两个密封环，即主密封环52和副密封环53。其中所述主密封环52和副密封环53的径向外侧固定在所述壳体5上，所述主密封环52和副密封环53的径向内侧与所述活塞4的径向外侧接触并且可相对移动。At least one sealing ring is provided between the housing 5 and the piston 4. As shown in FIG7 , in some embodiments, two sealing rings are provided between the housing 5 and the piston 4, namely, a main sealing ring 52 and a secondary sealing ring 53. The radial outer sides of the main sealing ring 52 and the secondary sealing ring 53 are fixed to the housing 5, and the radial inner sides of the main sealing ring 52 and the secondary sealing ring 53 are in contact with the radial outer side of the piston 4 and can move relatively.
在一些实施例中，所述壳体5上设置有补液孔54，制动油可以通过所述补液孔对壳体5内补充制动油。进一步地，所述补液孔54位于所述壳体5上在所述主密封环52和副密封环53之间的位置，这样，可以有效的防止制动油的泄露。In some embodiments, the housing 5 is provided with a fluid replenishing hole 54, through which the brake oil can be replenished in the housing 5. Furthermore, the fluid replenishing hole 54 is located between the primary sealing ring 52 and the secondary sealing ring 53 on the housing 5, so that leakage of the brake oil can be effectively prevented.
在一些实施例中，所述电液制动设备还包括推力轴承8。所述推力轴承8设置在所述丝杠轴200的径向外侧。其中，所述推力轴承8的内圈81与减速器2固定连接，并且与所述丝杠轴200(例如通过过盈配合的方式)固定连接，以使所述内圈81与所述丝杠轴200在轴向A和周向C相对止动，并且通过所述内圈81将所述减速器2的扭矩传递至所述丝杠轴200。所述推力轴承8的外圈82与所述壳体5固定连接，以使所述外圈82与所述壳体5至少在轴向A相对止动。这样，当套筒10沿轴向A相对于 丝杠轴200往复运动时，所述活塞4能够沿轴向A相对于所述壳体5的往复运动。In some embodiments, the electro-hydraulic brake device further includes a thrust bearing 8. The thrust bearing 8 is arranged on the radially outer side of the screw shaft 200. The inner ring 81 of the thrust bearing 8 is fixedly connected to the reducer 2 and is fixedly connected to the screw shaft 200 (for example, by means of interference fit) so that the inner ring 81 and the screw shaft 200 are relatively stopped in the axial direction A and the circumferential direction C, and the torque of the reducer 2 is transmitted to the screw shaft 200 through the inner ring 81. The outer ring 82 of the thrust bearing 8 is fixedly connected to the housing 5 so that the outer ring 82 and the housing 5 are relatively stopped at least in the axial direction A. In this way, when the sleeve 10 reciprocates relative to the screw shaft 200 along the axial direction A, the piston 4 can reciprocate relative to the housing 5 along the axial direction A.
进一步地，所述推力轴承8的外圈82可以(例如通过过盈配合的方式)直接与所述壳体5固定连接。在其他一些实施例中，所述外圈82还可以通过其他部件实现与所述壳体5固定连接。Furthermore, the outer ring 82 of the thrust bearing 8 may be directly fixedly connected to the housing 5 (for example, by interference fit). In some other embodiments, the outer ring 82 may also be fixedly connected to the housing 5 through other components.
具体地，所述电液制动设备还包括卡环7。所述卡环7和所述外圈82固定连接，并且，所述卡环7和所述壳体5固定连接，进而使卡环7对所述壳体5在轴向A上进行止动。例如，如图7所示，所述卡环7包括过盈配合部71和卡接环部72。所述过盈配合部71与所述外圈82以及壳体5过盈配合连接；所述卡接环部72与所述壳体5卡接配合，并与过盈配合部焊接在一起，实现所述卡环7与壳体5以及外圈82之间的固定连接。此外，所述卡环7与所述外圈82之间的固定连接以及所述卡环7与所述壳体5之间的固定连接还可以通过例如过盈配合、焊接、卡接等其他方式实现，在此不做限定。Specifically, the electro-hydraulic brake device further includes a snap ring 7. The snap ring 7 is fixedly connected to the outer ring 82, and the snap ring 7 is fixedly connected to the housing 5, so that the snap ring 7 stops the housing 5 in the axial direction A. For example, as shown in FIG7 , the snap ring 7 includes an interference fit portion 71 and a snap ring portion 72. The interference fit portion 71 is connected to the outer ring 82 and the housing 5 by interference fit; the snap ring portion 72 is snap-fitted with the housing 5 and welded to the interference fit portion to achieve a fixed connection between the snap ring 7 and the housing 5 and the outer ring 82. In addition, the fixed connection between the snap ring 7 and the outer ring 82 and the fixed connection between the snap ring 7 and the housing 5 can also be achieved by other methods such as interference fit, welding, snap-fitting, etc., which are not limited here.
可以理解的是，本发明中“多个”是指两个或两个以上，其它量词与之类似。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。字符“/”一般表示前后关联对象是一种“或”的关系。单数形式的“一种”、“所述”和“该”也旨在包括多数形式，除非上下文清楚地表示其他含义。It is to be understood that in the present invention, "plurality" refers to two or more than two, and other quantifiers are similar. "And/or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character "/" generally indicates that the associated objects before and after are in an "or" relationship. The singular forms "a", "the" and "the" are also intended to include plural forms, unless the context clearly indicates other meanings.
进一步可以理解的是，术语“第一”、“第二”等用于描述各种结构，但这些结构不应限于这些术语。这些术语仅用来将同一类型的结构彼此区分开，并不表示特定的顺序或者重要程度。实际上，“第一”、“第二”等表述完全可以互换使用。例如，在不脱离本发明范围的情况下，第一结构也可以被称为第二结构，类似地，第二结构也可以被称为第一结构。It is further understood that the terms "first", "second", etc. are used to describe various structures, but these structures should not be limited to these terms. These terms are only used to distinguish structures of the same type from each other, and do not indicate a specific order or importance. In fact, the expressions "first", "second", etc. can be used interchangeably. For example, without departing from the scope of the present invention, a first structure may also be referred to as a second structure, and similarly, a second structure may also be referred to as a first structure.
进一步可以理解的是，术语“中心”、“纵向”、“横向”、“前”、“后”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”等指示的方位或位置关系为基于附 图所示的方位或位置关系，仅是为了便于描述本实施例和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作。It will be further understood that the terms “center”, “longitudinal”, “lateral”, “front”, “back”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation.
进一步可以理解的是，除非有特殊说明，“连接”包括两者之间不存在其他构件的直接连接，也包括两者之间存在其他元件的间接连接。It can be further understood that, unless otherwise specified, “connection” includes a direct connection without other components between the two, and also includes an indirect connection with other components between the two.
进一步可以理解的是，本发明实施例中尽管在附图中以特定的顺序描述操作，但是不应将其理解为要求按照所示的特定顺序或是串行顺序来执行这些操作，或是要求执行全部所示的操作以得到期望的结果。在特定环境中，多任务和并行处理可能是有利的。It is further understood that, although the operations are described in a specific order in the accompanying drawings in the embodiments of the present invention, it should not be understood as requiring the operations to be performed in the specific order or serial order shown, or requiring the execution of all the operations shown to obtain the desired results. In certain environments, multitasking and parallel processing may be advantageous.
本领域技术人员在考虑说明书及实践这里公开的发明后，将容易想到本发明的其它实施方案。本申请旨在涵盖本发明的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本发明的一般性原理并包括本发明未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的，本发明的真正范围和精神由下面的权利范围指出。Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present invention, which follows the general principles of the present invention and includes common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present invention are indicated by the following scope of rights.
应当理解的是，本发明并不局限于上面已经描述并在附图中示出的精确结构，并且可以在不脱离其范围进行各种修改和改变。本发明的范围仅由所附的权利范围来限制。It should be understood that the present invention is not limited to the precise structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the scope of the appended claims.

Claims (10)

  1. 一种滚珠丝杠螺母(100)，其特征在于，包括：A ball screw nut (100), characterized by comprising:
    套筒(10)，所述套筒(10)设置有沿径向(R)贯通的容纳孔(11)；A sleeve (10), wherein the sleeve (10) is provided with a receiving hole (11) penetrating in a radial direction (R);
    保持架(20)，固定于所述容纳孔(11)内，所述保持架(20)设有容纳腔(21)；A retaining frame (20) is fixed in the receiving hole (11), and the retaining frame (20) is provided with a receiving cavity (21);
    第一滚珠(30)，可滚动地嵌设于所述保持架(20)的所述容纳腔(21)内，并部分凸出于所述套筒(10)的内壁；以及A first ball (30) is rollably embedded in the accommodating cavity (21) of the retaining frame (20) and partially protrudes from the inner wall of the sleeve (10); and
    第二滚珠(40)，位于所述第一滚珠(30)与所述保持架(20)的所述容纳腔(21)的内壁之间，用于使所述第一滚珠(30)相对于所述保持架(20)滚动。The second ball (40) is located between the first ball (30) and the inner wall of the accommodating cavity (21) of the retaining frame (20), and is used to enable the first ball (30) to roll relative to the retaining frame (20).
  2. 根据权利要求1所述的滚珠丝杠螺母(100)，其特征在于，The ball screw nut (100) according to claim 1, characterized in that:
    所述容纳孔(11)内设置有凸台(111)，使所述容纳孔(11)呈阶梯状；A boss (111) is provided in the receiving hole (11), so that the receiving hole (11) is in a stepped shape;
    所述保持架(20)的径向外侧延伸设置有凸缘(22)，所述凸缘(22)沿径向(R)部分或全部覆盖所述凸台(111)。A flange (22) is extended and arranged on the radial outer side of the retaining frame (20), and the flange (22) partially or completely covers the boss (111) in the radial direction (R).
  3. 根据权利要求2所述的滚珠丝杠螺母(100)，其特征在于，The ball screw nut (100) according to claim 2 is characterized in that:
    所述保持架(20)可在所述容纳孔(11)内沿径向(R)调节径向位置，通过调整所述保持架(20)在所述容纳孔(11)内的径向位置，以调整所述第一滚珠(30)凸出于所述套筒(10)的内壁的高度。The retaining frame (20) can adjust the radial position along the radial direction (R) in the receiving hole (11), and the height of the first ball (30) protruding from the inner wall of the sleeve (10) can be adjusted by adjusting the radial position of the retaining frame (20) in the receiving hole (11).
  4. 根据权利要求2所述的滚珠丝杠螺母(100)，其特征在于，The ball screw nut (100) according to claim 2 is characterized in that:
    所述滚珠丝杠螺母(100)还包括调整环，用于卡套在所述保持架(20)的外部，用于固定所述保持架(20)在所述容纳孔(11)内的径向位置；The ball screw nut (100) further comprises an adjusting ring, which is used for clamping onto the outside of the retaining frame (20) and for fixing the radial position of the retaining frame (20) in the receiving hole (11);
    其中，所述调整环的径向外侧与所述保持架(20)的凸缘(22)抵接，所述调整环的径向内侧与所述容纳孔(11)的所述凸台(111)抵接。The radial outer side of the adjustment ring abuts against the flange (22) of the retaining frame (20), and the radial inner side of the adjustment ring abuts against the boss (111) of the receiving hole (11).
  5. 根据权利要求1所述的滚珠丝杠螺母(100)，其特征在于，The ball screw nut (100) according to claim 1, characterized in that:
    所述保持架(20)的径向内侧设有弯曲挡板23，所述弯曲挡板23使所述容纳腔(21)的开口直径(V1)小于所述第一滚珠(30)的直径。A curved baffle 23 is provided on the radial inner side of the retaining frame (20), and the curved baffle 23 makes the opening diameter (V1) of the accommodating cavity (21) smaller than the diameter of the first rolling ball (30).
  6. 根据权利要求1所述的滚珠丝杠螺母(100)，其特征在于，The ball screw nut (100) according to claim 1, characterized in that:
    所述第二滚珠(40)的直径小于所述第一滚珠(30)的直径。The diameter of the second rolling ball (40) is smaller than the diameter of the first rolling ball (30).
  7. 根据权利要求1所述的滚珠丝杠螺母(100)，其特征在于，The ball screw nut (100) according to claim 1, characterized in that:
    所述套筒(10)设有多个所述容纳孔(11)，且多个所述容纳孔(11)沿所述套筒(10)的周向间隔设置且呈螺旋形排列。The sleeve (10) is provided with a plurality of the accommodating holes (11), and the plurality of the accommodating holes (11) are arranged at intervals along the circumference of the sleeve (10) and are arranged in a spiral shape.
  8. 根据权利要求1所述的滚珠丝杠螺母(100)，其特征在于，The ball screw nut (100) according to claim 1, characterized in that:
    所述保持架(20)的每个所述容纳腔(21)内设置有多个第二滚珠(40)。A plurality of second rolling balls (40) are arranged in each of the accommodating cavities (21) of the retaining frame (20).
  9. 一种滚珠丝杠(1)，其特征在于，包括：A ball screw (1), characterized by comprising:
    丝杠轴(200)，所述丝杠轴(200)的外壁设置有螺旋槽(50)；以及A screw shaft (200), wherein the outer wall of the screw shaft (200) is provided with a spiral groove (50); and
    如权利要求1至8中任一项所述的滚珠丝杠螺母(100)，所述滚珠丝杠螺母(100)套设在所述丝杠轴(200)的外部；The ball screw nut (100) according to any one of claims 1 to 8, wherein the ball screw nut (100) is sleeved on the outside of the screw shaft (200);
    其中，所述第一滚珠(30)沿所述螺旋槽(50)滚动，且轴向(A)相邻的两个所述第一滚珠(30)的珠心间距(W1)大于相邻两个所述螺旋槽(50)的槽距(W2)。The first rolling balls (30) roll along the spiral groove (50), and the ball center distance (W1) between two adjacent first rolling balls (30) in the axial direction (A) is greater than the groove distance (W2) between two adjacent spiral grooves (50).
  10. 一种电液制动设备，其特征在于，包括：如权利要求9所述的滚珠丝杠(1)、减速器(2)、电机(3)、活塞(4)和壳体(5)；所述电机(3)经由所述减速器(2)连接到所述滚珠丝杠(1)的轴向一端，所述滚珠丝杠(1)的轴向的另一端连接有所述活塞(4)，所述活塞(4)设置于所述壳体(5)的内部沿轴向(A)做往复运动。An electro-hydraulic brake device, characterized in that it comprises: a ball screw (1) as described in claim 9, a reducer (2), a motor (3), a piston (4) and a housing (5); the motor (3) is connected to one axial end of the ball screw (1) via the reducer (2), the other axial end of the ball screw (1) is connected to the piston (4), and the piston (4) is arranged inside the housing (5) and reciprocates along the axial direction (A).
PCT/CN2023/070760 2022-11-24 2023-01-05 Ball screw nut, ball screw, and electro-hydraulic braking device WO2024108746A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/CN2022/134079 WO2024108487A1 (en) 2022-11-24 2022-11-24 Ball screw nut and ball screw
CNPCT/CN2022/134079 2022-11-24

Publications (1)

Publication Number Publication Date
WO2024108746A1 true WO2024108746A1 (en) 2024-05-30

Family

ID=91194847

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/CN2022/134079 WO2024108487A1 (en) 2022-11-24 2022-11-24 Ball screw nut and ball screw
PCT/CN2023/070760 WO2024108746A1 (en) 2022-11-24 2023-01-05 Ball screw nut, ball screw, and electro-hydraulic braking device

Family Applications Before (1)

Application Number Title Priority Date Filing Date
PCT/CN2022/134079 WO2024108487A1 (en) 2022-11-24 2022-11-24 Ball screw nut and ball screw

Country Status (1)

Country Link
WO (2) WO2024108487A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007002858A (en) * 2005-06-21 2007-01-11 Toyota Motor Corp Ball screw device
JP2012077905A (en) * 2010-09-07 2012-04-19 Nsk Ltd Ball screw device
CN204127122U (en) * 2014-10-27 2015-01-28 杭州恩斯克万达电动转向***有限公司 A kind of low friction ball bearing
CN107002842A (en) * 2014-11-25 2017-08-01 佩朗股份有限公司 Ball-screw nut mechanism
CN107208764A (en) * 2015-01-26 2017-09-26 舍弗勒技术股份两合公司 Ball screw drive device and related electric motor actuator
CN109249920A (en) * 2017-07-12 2019-01-22 罗伯特·博世有限公司 For hydraulic power-assisted-vehicle brake apparatus piston pump assembly
CN214689436U (en) * 2020-12-31 2021-11-12 博世汽车部件(苏州)有限公司 Hydraulic assembly and electric control hydraulic brake

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000104744A (en) * 1998-09-30 2000-04-11 Ntn Corp Rolling bearing
JP4134745B2 (en) * 2003-02-10 2008-08-20 株式会社ジェイテクト Ball screw device
JP2016109205A (en) * 2014-12-05 2016-06-20 Ntn株式会社 Ball screw device
JP2016148357A (en) * 2015-02-10 2016-08-18 日本精工株式会社 Ball screw device
JP6859691B2 (en) * 2016-12-12 2021-04-14 日本精工株式会社 Ball screw device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007002858A (en) * 2005-06-21 2007-01-11 Toyota Motor Corp Ball screw device
JP2012077905A (en) * 2010-09-07 2012-04-19 Nsk Ltd Ball screw device
CN204127122U (en) * 2014-10-27 2015-01-28 杭州恩斯克万达电动转向***有限公司 A kind of low friction ball bearing
CN107002842A (en) * 2014-11-25 2017-08-01 佩朗股份有限公司 Ball-screw nut mechanism
CN107208764A (en) * 2015-01-26 2017-09-26 舍弗勒技术股份两合公司 Ball screw drive device and related electric motor actuator
CN109249920A (en) * 2017-07-12 2019-01-22 罗伯特·博世有限公司 For hydraulic power-assisted-vehicle brake apparatus piston pump assembly
CN214689436U (en) * 2020-12-31 2021-11-12 博世汽车部件(苏州)有限公司 Hydraulic assembly and electric control hydraulic brake

Also Published As

Publication number Publication date
WO2024108487A1 (en) 2024-05-30

Similar Documents

Publication Publication Date Title
US7374027B2 (en) Balanced flow cooling water jacket
US20150203079A1 (en) Electric disc brake device
KR20030009375A (en) Screw actuator
JP2009523966A (en) Friction gear
KR0127841B1 (en) Device for interconverting rotary motion and linear reciporcation motion
US5979295A (en) Hydraulic motor piston
WO2024108746A1 (en) Ball screw nut, ball screw, and electro-hydraulic braking device
KR102006078B1 (en) Clutch actuator with cam slider deceleration structure
US3678804A (en) Axial-piston machine
US20090033273A1 (en) Direct Drive Torque Motor
US4051933A (en) Low inertia clutch and brake system
CN113892003A (en) Ball screw mechanism and linear movement device
US6443287B2 (en) Clutch
US7474025B1 (en) Main shaft clearance eliminating structure for a direct drive torque motor
CN216241937U (en) Intermediate shaft brake assembly
US20090032335A1 (en) Bearing-Lubricating Structure for a Direct Drive Torque Motor
KR19990066976A (en) Transmission with two-way clutch device
CN219565215U (en) Ball circulation assembly for power steering gear and power steering gear
EP3818278A1 (en) Clutch actuator
JP2014501866A (en) Balance plate assembly for fluidic devices
JP2565809B2 (en) Worm gear
RU2597055C1 (en) Wave gear with two deformable toothed or friction wheels by v.a. abramov
KR101765519B1 (en) Swaging apparatus
FI130485B (en) Radial piston hydraulic motor comprising hollow rotating shaft inside the motor
CN216290426U (en) Wear-resistant energy-saving hydraulic oil pump motor set