CN114593035A

CN114593035A - Combined motor pump

Info

Publication number: CN114593035A
Application number: CN202210287290.7A
Authority: CN
Inventors: 姜虎; 袁朝国; 郁静; 郭帅; 张二莉; 朱宇; 吕福春
Original assignee: Xuzhou Keyuan Hydraulics Co ltd
Current assignee: Xuzhou Keyuan Hydraulics Co ltd
Priority date: 2022-03-23
Filing date: 2022-03-23
Publication date: 2022-06-07

Abstract

The invention belongs to a hydraulic combined pump, and particularly relates to a combined motor pump which comprises a front cover, a pump shell, a motor shell and a rear cover, wherein a pump driving gear and a pump driven gear which are mutually meshed are arranged in the pump shell; the baffle is provided with a hole A penetrating through the baffle from the thickness direction of the baffle, a gear shaft of the pump driving gear is in transmission connection with a gear shaft of the motor driving gear at the hole A of the baffle, and the outer side surface of the baffle is provided with a vent plug connector communicated with the hole A; the pump driving gear and the pump shell are provided with an oil seal I at a position close to a hole A of the partition plate, and the motor driving gear and the motor shell are provided with an oil seal II at a position close to the hole A of the partition plate. When oil blow-by occurs, the oil is discharged from the breather plug, preventing oil blow-by from occurring between the drive motor and the oil pump.

Description

Combined motor pump

Technical Field

The invention belongs to a hydraulic combined pump, and particularly relates to a combined motor pump.

Background

The combined motor pump is a motor and pump combined structure product with working medium separation performance, the product utilizes a pressure oil source in a main system to drive an oil pump to work, then oil at the bottom of a gearbox is conveyed to the top to realize lubrication, and simultaneously, because the cleanliness of the lubricating oil liquid of the gearbox per se relative to a host hydraulic system is different, the motor and the pump respectively use two independent oil sources to work, and the oil channeling condition can not occur between the motor and the pump, so that mutual pollution is caused.

In the prior art, as in chinese patent: the publication No. CN211449019U, granted bulletin No. 2020, 09 and 08, a bidirectional sealing ring is arranged between the motor and the pump to realize mutual sealing between the driving motor and the oil pump, however, the phenomenon of oil leakage is still found in the subsequent use process, the main reason is that the lubricating oil of the gearbox is too dirty and contains hard impurities such as iron chips and the like, the oil seal lip is damaged after long-term work, so that the oil leakage phenomenon between a driving motor and a pump is caused, when system hydraulic oil of a driving motor flows into a gearbox after flowing into an oil pump, the oil of the system is reduced, and the oil of a system oil cylinder is not in place due to the oil shortage of the system when the system oil is serious, the oil cylinder sucking air in the system climbs and the like, when oil in the gearbox flows into the system after flowing into the motor, the oil can pollute the whole hydraulic system, and the problems of system valve circuit clamping stagnation, part transitional wear and the like are caused, so that the oil leakage result caused by the fact that an oil seal between the driving motor and the oil pump is damaged is serious.

The connection form of motor drive oil pump is the spline fit form commonly used, and to the less condition of shaft diameter, the internal spline hole also can be less, can only use the linear cutting processing during processing internal spline, and the machining precision is relatively poor moreover.

The driving motor and the oil pump in the existing motor pump are fixed axial clearance structures, and the structures are gapped between the sliding sleeve and the end face of the gear during working, so that the resistance of the gear pair during rotary working is small, and the motor starting driving is facilitated.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a combined motor pump, which changes the original bidirectional oil seal into two independent oil seals which are respectively assembled on a driving motor and an oil pump.

The invention is realized by the following technical scheme: a combined motor pump comprises a front cover, a pump shell, a motor shell and a rear cover, wherein a pump driving gear and a pump driven gear which are mutually meshed are arranged in the pump shell; the baffle is provided with a hole A penetrating through the baffle from the thickness direction of the baffle, a gear shaft of the pump driving gear is in transmission connection with a gear shaft of the motor driving gear at the hole A of the baffle, and the outer side surface of the baffle is provided with a vent plug connector communicated with the hole A; the pump driving gear and the pump shell are provided with an oil seal I at a position close to a hole A of the partition plate, and the motor driving gear and the motor shell are provided with an oil seal II at a position close to the hole A of the partition plate.

The cross connecting sleeve comprises a transverse straight hole arranged in the middle of the left side of the cross connecting sleeve and a longitudinal straight hole arranged in the middle of the right side of the cross connecting sleeve; the gear shaft of the pump driving gear is in transmission connection with the gear shaft of the motor driving gear through a cross connecting sleeve.

Further, the transverse straight hole of the cross connecting sleeve is communicated with the longitudinal straight hole of the cross connecting sleeve.

Furthermore, gear shafts positioned on two sides of a driving gear of the pump driving gear and gear shafts positioned on two sides of a driven gear of the pump driven gear are supported on the two sets of sliding sleeves I through corresponding needle roller bearings I, and a fixed side plate is arranged between the sliding sleeve I positioned on the left side and the front cover; the gear shafts located on two sides of the driving gear of the motor driving gear and the gear shafts located on two sides of the driven gear of the motor driven gear are supported on the two sets of sliding sleeves II through corresponding needle roller bearings II, floating side plates are arranged between the gear end faces of two sides of the motor and the corresponding sliding sleeves II, and W sealing rings and supporting strips which are in contact with the floating side plates are arranged on the side faces of the sliding sleeves II.

Furthermore, the gear shaft of the pump driving gear extends to the outer side of the front cover from the pump housing, and a connecting spline is arranged on the gear shaft of the pump driving gear positioned on the outer side of the front cover.

Furthermore, guiding positioning pins are arranged between the front cover and the pump shell, between the pump shell and the partition plate, between the partition plate and the motor shell, and between the motor shell and the rear cover.

Further, the front cover, the pump housing, the partition plate, the motor housing, and the rear cover are fastened by bolts.

The invention has the beneficial effects that: one, with original two-way oil blanket change for two solitary oil blankets, assemble respectively on driving motor and the oil pump, be equipped with the breather plug on the breather plug interface, when taking place the oil blowby, fluid is discharged from the breather plug, prevents to take place the oil blowby between driving motor and the oil pump, and the hole A department that simultaneously the breather plug can prevent outside foul entering baffle harms the oil blanket.

The gear shaft of the flat head at the transmission end part is matched with the cross connecting sleeve 10, so that the structure greatly reduces the processing difficulty and improves the transmission precision.

And thirdly, the driving motor adopts a structure with axial clearance compensation, so that the driving rotating speed is obviously improved, and the driving transmission efficiency is improved.

Drawings

FIG. 1 is a structural cross-sectional view of the present invention;

FIG. 2 is a schematic exterior product profile of the present invention;

FIG. 3 is a schematic structural view of the cross connecting sleeve of the present invention;

FIG. 4 is a left side view of FIG. 3;

in the figure, 1, a pump driving gear, 2, a front cover, 3, a hole retainer ring I, 4, a framework oil seal, 5, a sliding sleeve I, 6, a pump shell, 7, a pump driven gear, 8, an oil seal I, 9, a hole retainer ring II, 10, a cross connecting sleeve, 11, a W sealing ring, 12, a supporting strip, 13, a floating side plate, 14, a sliding sleeve II, 15, a motor driving gear, 16, a bolt, 17, a needle bearing II, 18, a rear cover, 19, a motor shell, 20, a motor driven gear, 21, an oil seal II, 22, a hole retainer ring III, 23, a vent plug interface, 24, a partition plate, 25, a needle bearing I, 26, a fixed side plate, 27 and a connecting spline.

Detailed Description

The invention is further illustrated below with reference to the figures and examples.

As shown in fig. 1 and 2, a combined motor pump includes a front cover 2, a pump housing 6, a partition plate 24, a motor housing 19 and a rear cover 18, a pump driving gear 1 and a pump driven gear 7 which are engaged with each other are provided in the pump housing 6, a motor driving gear 15 and a motor driven gear 20 which are engaged with each other are provided in the motor housing 19, the front cover 2, the pump housing 6, the partition plate 24, the motor housing 19 and the rear cover 18 are fastened and connected by bolts 16 in sequence, and seal rings are provided between the front cover 2 and the pump housing 6, between the pump housing 6 and the partition plate 24, between the partition plate 24 and the motor housing 19, and between the motor housing 19 and the rear cover 18.

The gear shaft on the left side of the pump driving gear 1 also extends to the outer side of the front cover 2 from the pump housing 6, a connecting spline 27 is arranged on the gear shaft of the pump driving gear 1 on the outer side of the front cover 2, and the connecting spline 27 is used for detecting whether the gear pump part can normally work or not through the transmission work of a motor and the connecting spline 27 when the gear pump is delivered from a factory. A framework oil seal 4 is arranged between a gear shaft on the left side of the pump driving gear 1 and the front cover 2, the right side of the framework oil seal 4 is axially limited by an inner shaft shoulder of the front cover 2, and the left side of the framework oil seal 4 is axially limited by a check ring I3 for a hole arranged on the front cover 2.

As shown in fig. 1, the partition plate 24 is provided with a hole a penetrating the partition plate 24 from the thickness direction of the partition plate 24, and the gear shaft on the right side of the pump drive gear 1 and the gear shaft on the left side of the motor drive gear 15 are drivingly connected to each other at the hole a of the partition plate 24. The outer side of the partition plate 24 is provided with a vent plug port 23 communicated with the hole A. Pump driving gear 1 and pump casing 6 are provided with oil blanket I8 in the hole A department that is close to baffle 24, and the left side of oil blanket I8 is spacing by the inside shaft shoulder axial of pump casing 6, and the right side of oil blanket I8 is spacing by setting up retaining ring II 9 axial for the hole on pump casing 6. An oil seal II 21 is arranged between the motor driving gear 15 and the motor shell 19 at a position close to the hole A of the partition plate 24, the left side of the oil seal II 21 is axially limited by a hole retainer ring III 22 arranged on the motor shell 19, and the right side of the oil seal II 21 is axially limited by an inner shaft shoulder of the motor shell 19. The breather plug interface 23 is equipped with the breather plug at last, when the oil leak takes place, the fluid of revealing can flow into the hole A department of baffle 24, and it is external to flow the combination motor pump through the breather plug of installing on the breather plug interface 23, rather than direct cross flow to drive motor or oil pump in, the operator can judge whether there is the oil leak condition through the situation of regularly observing breather plug department, can discover the problem as early as possible, the effect of oil blowby suggestion protection has been had, the system fluid that mutual oil blowby between drive motor and the oil pump led to has effectively been prevented is polluted or the system lacks oily scheduling problem, the security and the reliability of work have been improved greatly.

As shown in fig. 1, 3 and 4, the transmission connection between the gear shaft on the right side of the pump driving gear 1 and the gear shaft on the left side of the motor driving gear 15 is realized by a cross connecting sleeve 10, and the cross connecting sleeve 10 comprises a transverse straight hole arranged in the middle of the left side of the cross connecting sleeve 10 and a longitudinal straight hole arranged in the middle of the right side of the cross connecting sleeve 10; the gear shaft of the pump driving gear 1 is assembled with the horizontal linear hole in the middle of the left side of the cross connecting sleeve 10, and the gear shaft of the motor driving gear 15 is assembled with the vertical linear hole in the middle of the right side of the cross connecting sleeve 10. The power transmission between the pump drive gear 1 and the motor drive gear 15 is realized by the cross-shaped connecting sleeve 10 as a transmission element. Specifically, as shown in fig. 3, the transverse linear hole of the cross connecting sleeve 10 is communicated with the longitudinal linear hole of the cross connecting sleeve 10. This application adopts the gear shaft cooperation cross adapter sleeve 10's of the flat head of transmission tip form, and this structure greatly reduced the processing degree of difficulty to transmission precision has been improved.

As shown in fig. 1, including two sets of sliding sleeves i 5 and two sets of sliding sleeves ii 14, the gear shaft that is located the driving gear both sides of pump driving gear 1 and the gear shaft that is located the driven gear both sides of pump driven gear 7 all support on two sets of sliding sleeves i 5 through corresponding bearing I25, are located and are equipped with fixed curb plate 26 between left sliding sleeve i 5 and protecgulum 2. Gear shafts located on two sides of a driving gear of the motor driving gear 15 and gear shafts located on two sides of a driven gear of the motor driven gear 20 are supported on the two sets of sliding sleeves II 14 through corresponding needle roller bearings II 17, floating side plates 13 are arranged between gear end faces of two sides of the motor and the corresponding sliding sleeves II 14, and W sealing rings 11 and supporting bars 12 which are in contact with the floating side plates 13 are arranged on the side faces of the sliding sleeves II 14.

Considering that the oil pump has lower use pressure, in order to improve the whole use efficiency, the oil pump part of the application adopts a fixed axial clearance structure, and the driving motor part is changed into a structure with axial clearance compensation, the structure uses a sliding sleeve II 14 and a floating side plate 13, and a W sealing ring 11 and a supporting bar 12 are arranged between the two, the driving oil forms pressure between the sliding sleeve II 14 and the floating side plate 13 under the action of the W sealing ring 11 and the supporting bar 12, when the pressure is driven, the pressure pushes the floating side plate 13 to be tightly attached to the end face of the gear, thereby reducing leakage, improving driving efficiency, meanwhile, the compression amount of the W sealing ring 11 is reduced to 50% of that of a normal high-pressure product, so that the starting torque generated by compressing the W sealing ring 11 is greatly reduced, through tests, the use requirement can be completely met, meanwhile, the driving rotating speed is obviously improved, and the driving transmission efficiency is improved.

As a modification of this embodiment, guide positioning pins are provided between the front cover 2 and the pump housing 6, between the pump housing 6 and the partition plate 24, between the partition plate 24 and the motor housing 19, and between the motor housing 19 and the rear cover 18. When the parts are assembled, the guide positioning pin is inserted firstly, and the other part is placed in alignment with the guide positioning pin, for example, when the front cover 2 is assembled with the pump shell 6, the guide positioning pin is placed in the pin hole of the front cover 2 firstly, and then the pin hole of the pump shell 6 is inserted in alignment with the guide positioning pin, so that the guide positioning pin is used for ensuring the connection coaxiality, and meanwhile, the parts are limited in advance to facilitate subsequent fastening.

Claims

1. The utility model provides a combination motor pump, includes protecgulum (2), pump casing (6), motor casing (19) and hou gai (18), is equipped with intermeshing's pump driving gear (1) and pump driven gear (7) in pump casing (6), is equipped with intermeshing's motor driving gear (15) and motor driven gear (20) in motor casing (19), and the gear shaft of pump driving gear (1) is connected with the gear shaft transmission of motor driving gear (15), its characterized in that: the pump also comprises a partition plate (24), and the front cover (2), the pump shell (6), the partition plate (24), the motor shell (19) and the rear cover (18) are sequentially connected; a hole A penetrating through the partition plate (24) from the thickness direction of the partition plate (24) is formed in the partition plate (24), a gear shaft of the pump driving gear (1) is in transmission connection with a gear shaft of the motor driving gear (15) at the hole A of the partition plate (24), and a vent plug interface (23) communicated with the hole A is formed in the outer side face of the partition plate (24); an oil seal I (8) is arranged at a position of a hole A close to the partition plate (24) of the pump driving gear (1) and the pump shell (6), and an oil seal II (21) is arranged at a position of a hole A close to the partition plate (24) of the motor driving gear (15) and the motor shell (19).

2. The combination motor pump as defined in claim 1, wherein: the connecting device also comprises a cross connecting sleeve (10), wherein the cross connecting sleeve (10) comprises a transverse straight hole arranged in the middle of the left side of the cross connecting sleeve (10) and a longitudinal straight hole arranged in the middle of the right side of the cross connecting sleeve (10); the gear shaft of the pump driving gear (1) is in transmission connection with the gear shaft of the motor driving gear (15) through a cross connecting sleeve (10).

3. The combination motor pump as defined in claim 2, wherein: the transverse straight hole of the cross connecting sleeve (10) is communicated with the longitudinal straight hole of the cross connecting sleeve (10).

4. The combination motor pump as defined in claim 1, wherein: gear shafts positioned at two sides of a driving gear of the pump driving gear (1) and gear shafts positioned at two sides of a driven gear of the pump driven gear (7) are supported on the two groups of sliding sleeves I (5) through corresponding needle bearings I (25), and a fixed side plate (26) is arranged between the sliding sleeve I (5) positioned at the left side and the front cover (2); the gear shafts on two sides of the driving gear of the motor driving gear (15) and the gear shafts on two sides of the driven gear of the motor driven gear (20) are supported on the two sets of sliding sleeves II (14) through corresponding needle roller bearings II (17), floating side plates (13) are arranged between the gear end surfaces on two sides of the motor and the corresponding sliding sleeves II (14), and W sealing rings (11) and supporting strips (12) which are in contact with the floating side plates (13) are arranged on the side surfaces of the sliding sleeves II (14).

5. The combination motor pump as defined in claim 1, wherein: the gear shaft of the pump driving gear (1) also extends to the outer side of the front cover (2) from a pump shell (6), and a connecting spline (27) is arranged on the gear shaft of the pump driving gear (1) positioned on the outer side of the front cover (2).

6. The combination motor pump as defined in claim 1, wherein: and guide positioning pins are arranged between the front cover (2) and the pump shell (6), between the pump shell (6) and the partition plate (24), between the partition plate (24) and the motor shell (19), and between the motor shell (19) and the rear cover (18).

7. The combination motor pump as defined in claim 1, wherein: the front cover (2), the pump shell (6), the partition plate (24), the motor shell (19) and the rear cover (18) are fixedly connected through bolts (16).