Internal gear pump and gearbox

Abstract

The internal gear pump comprises a pump body, a pump cover, a driving gear and a driven gear, the driving gear and the driven gear are installed in the pump body, the driven gear is installed in an annular groove of the pump body in a floating mode, outer teeth of the driving gear are meshed with inner teeth of the driven gear, the driving gear is rotationally connected with a positioning seat through a second bearing, and the positioning seat is of a boss structure. The positioning seat is located outside the pump cover and fixedly connected with the pump cover, a plurality of tooth grooves are formed in an inner hole of the driving gear at intervals in the circumferential direction, the tooth grooves are used for being connected with a driving unit through connecting pieces, the positioning mode of the driving gear is changed, positioning and supporting of the driving gear depend on the positioning seat, and the positioning precision of the driving gear is effectively improved; the control requirement for manufacturing precision of other parts of the gearbox is reduced, the manufacturing cost of the gearbox is further reduced, the positioning precision of the driving gear is improved, the service life of the gear pump can be effectively prolonged, the reliability of the gear pump can be effectively improved, meanwhile, the running noise of the gearbox is reduced, and the requirement for low noise of the whole machine is met.

Description

Technical Field

[0001] The utility model relates to the technical field of gear pumps, in particular to an internal gear pump and a gearbox. Background Technique

[0002] The AT gearbox, namely the hydraulic mechanical automatic gearbox, is a type of automatic gearbox widely used in the current automobile transmission system. The AT gearbox includes a torque converter, which is located at the front end of the gearbox and plays a role in transmitting and increasing torque.

[0003] Currently, in order to improve the compactness of the gearbox structure, reduce the installation space requirements of the gearbox and the universality of the whole machine supporting for the AT gearbox used in engineering machinery, the gear pump used in the gearbox is internally installed between the torque converter and the gearbox. The gear pump adopts an internal gear pump, and the gear pump is coaxially installed with the torque converter, and the driving gear of the gear pump is supported on the torque converter through spline connection (such as the publication number CN220036927U). The driven gear of the gear pump is floatingly installed on the pump body of the gear pump, and the oil inlet oil circuit of the torque converter is internally arranged between the pump hub of the torque converter and the guide wheel seat of the gearbox.

[0004] In the existing gear pump structure, the driving gear is key-connected with the torque converter, and the driving gear relies on the torque converter for positioning and support. The installation and positioning accuracy of the driving gear of the gear pump is affected by the manufacturing accuracy of the torque converter assembly components and the installation and connection accuracy between the torque converter and the engine. And the installation and positioning accuracy of the driving gear of the gear pump directly affects the reliability and service life of the gear pump. Therefore, it is necessary to ensure the manufacturing accuracy of the torque converter, resulting in an increase in the overall manufacturing cost of the gearbox. Summary of the Utility Model

[0005] In order to solve the technical problem that the installation and positioning accuracy of the driving gear of the existing gear pump in the above background technique is affected by the manufacturing accuracy of the torque converter, the utility model provides an internal gear pump and a gearbox.

[0006] The technical solution of the utility model is as follows:

[0007] The utility model provides an internal meshing gear pump, which comprises a pump body, a pump cover, a driving gear and a driven gear installed in the pump body. The driven gear is an internal gear, and the driving gear is an external gear. The driven gear is floatingly installed in the annular groove of the pump body. The external teeth of the driving gear mesh with the internal teeth of the driven gear. The driving gear is rotationally connected to a positioning seat through a second bearing. The positioning seat is of a boss structure, located outside the pump cover and fixedly connected to the pump cover. A plurality of tooth grooves are arranged at intervals along the circumferential direction of the inner hole of the driving gear. The tooth grooves are used to be connected to a driving unit through a connecting piece. The arrangement of the positioning seat and the second bearing, and by changing the structure of the driving gear of the gear pump, the positioning mode of the driving gear is changed. The driving gear no longer relies on a torque converter for positioning and support. The positioning and support of the driving gear rely on the positioning seat, effectively improving the positioning accuracy of the driving gear, reducing the control requirements for the manufacturing accuracy of other parts of the gearbox, and further reducing the manufacturing cost of the gearbox. Moreover, the improvement of the positioning accuracy of the driving gear can effectively improve the service life and reliability of the gear pump, and at the same time reduce the operating noise of the gearbox, meeting the requirements of the whole machine for low noise.

[0008] Preferably, the outer ring of the second bearing is installed in the inner hole of the driving gear by interference fit, and the inner ring of the second bearing is in clearance fit with the convex part of the positioning seat, realizing the positioning and support of the driving gear while ensuring the rotational fit between the driving gear and the driven gear.

[0009] Preferably, the tooth grooves penetrate through the driving gear. The cross-section of the tooth grooves is rectangular. One side of the tooth grooves is open and the open side is blocked by the outer ring of the second bearing. Some of the tooth grooves are used as oil channels. On the basis of realizing the oil supply of the gear pump and the built-in lubricating oil path, the structure of the gear pump is made more compact, meeting the requirements of built-in installation. At the same time, it is also used as a driving structure for the torque converter to drive the driving gear of the gear pump to rotate. The tooth grooves can be connected to driving units such as torque converters through connecting pieces.

[0010] Preferably, a crescent plate is fixedly arranged in the annular groove of the pump body. The crescent plate is located between the driving gear and the driven gear and is used to divide the cavity formed by the tooth profiles of the driving gear and the driven gear into two parts, thus forming two cavities to serve as the low-pressure cavity and the high-pressure cavity of the gear pump.

[0011] Preferably, a sealing ring groove is formed on the outer wall of the pump body, and a first sealing ring is fixedly arranged in the sealing ring groove to seal the mating clearance between the gear pump and the installation hole of the gearbox.

[0012] Preferably, an installation hole is formed in the pump body. The installation hole is coaxially arranged with the annular groove. The installation hole is of a stepped hole structure. A first bearing and a second sealing ring are fixedly arranged in the installation hole. The second sealing ring is located inside the installation hole and is used to block the lubricating oil and assist in supporting the torque converter.

[0013] Preferably, an oil seal is detachably installed at the end face of the pump body where the installation hole is provided. The internal lubricating oil of the gear pump is sealed by the oil seal and the outer circle of the torque converter, so as to realize the sealing of the lubricating oil. The lubricating oil can flow to the gearbox through the oil discharge hole on the pump body.

[0014] The utility model provides a gearbox, which includes an internal meshing gear pump, a torque converter and a gearbox housing. Two oppositely arranged shifting teeth are fixedly provided at the output end of the torque converter. The shifting teeth are inserted into the tooth grooves, and the positioning seat is fixedly arranged on the gearbox housing.

[0015] Preferably, the cross-sectional dimension of the shifting tooth is smaller than that of the tooth groove, which ensures smooth rotation and avoids jamming.

[0016] It can be seen from the above technical solutions that the advantages of the utility model are as follows:

[0017] 1. The driving gear is rotationally connected to the positioning seat through the second bearing. A plurality of tooth grooves are arranged at intervals along the circumferential direction of the inner hole of the driving gear. The setting of the positioning seat and the second bearing, and by changing the structure of the driving gear of the gear pump, the positioning method of the driving gear is changed. The driving gear no longer relies on the torque converter for positioning and support. The positioning and support of the driving gear rely on the positioning seat, which effectively improves the positioning accuracy of the driving gear, reduces the control requirements for the manufacturing accuracy of the torque converter parts, and further reduces the manufacturing cost of the gearbox. Moreover, the improvement of the positioning accuracy of the driving gear can effectively improve the service life and reliability of the gear pump, and at the same time reduce the running noise of the gearbox, meeting the requirement of low noise of the whole machine.

[0018] 2. Some of the tooth grooves are used as oil channels. On the basis of realizing the oil supply of the gear pump and the built-in lubricating oil path, the structure of the gear pump is made more compact, meeting the built-in installation requirements. At the same time, it is also used as the driving structure for the torque converter to drive the driving gear of the gear pump to rotate. The tooth grooves can be connected to the driving units such as the torque converter through connecting parts, which is convenient for driving the driving gear. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions of the utility model, the drawings required to be used in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0020] Figure 1 It is a schematic side sectional view of an internal meshing gear pump according to one or more embodiments of the utility model;

[0021] Figure 2 It is a schematic cross-sectional view of an internal meshing gear pump according to one or more embodiments of the utility model;

[0022] Figure 3 Schematic diagram of the connection between an internal gear pump and a torque converter according to one or more embodiments of the present utility model;

[0023] The components represented by the reference numerals in the figure are as follows:

[0024] 1. First sealing ring; 2. Pump body; 3. First bolt; 4. Oil seal; 5. First bearing; 6. Second sealing ring; 7. Second bearing; 8. Driving gear; 81. Tooth groove; 9. Driven gear; 10. Pump cover; 11. Second bolt; 12. Crescent plate; 13. Torque converter; 14. Poking tooth; 15. Positioning seat; 16. Gearbox housing. Specific embodiments

[0025] In order to make the objectives, features, and advantages of the present utility model more obvious and understandable, the technical solutions in the present utility model will be clearly and completely described below with reference to the accompanying drawings in the specific embodiments of the present utility model. Obviously, the embodiments described below are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in this patent, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this patent.

[0026] Embodiment 1

[0027] In a typical embodiment of the present utility model, as Figures 1-3 shown, an internal gear pump is proposed, which includes: a pump body 2, a driving gear 8, a driven gear 9, and a pump cover 10. The pump body 2 and the pump cover 10 are fixedly connected by a first bolt 3. The driven gear 9 is of an internal gear structure and is floatingly installed in the pump body 2. The external teeth of the driving gear 8 mesh with the internal teeth of the driven gear 9 to drive the rotation of the driven gear 9.

[0028] It can be understood that the connection between the pump cover 10 and the pump body 2 is not limited to the bolt connection method, and other positioning connection methods such as double-pin positioning + bolt connection and spigot positioning + bolt connection can also be used.

[0029] The pump body 2 is of an existing structure. The pump body 2 includes an oil suction port, a low-pressure oil chamber, a high-pressure oil chamber, an oil discharge hole, a sealing ring groove, a lubricating oil groove, an annular groove, an oil seal 4, a mounting hole, and a crescent plate 12. The pump cover 10 is a disc structure including an oil suction port, a low-pressure oil chamber, a high-pressure oil chamber, and an oil outlet. The pump cover 10 is installed and fixed to the pump body 2 by a first bolt 3.

[0030] The driven gear 9 is of an internal gear structure. Internal teeth are fixedly arranged along the circumferential direction on the inner hole wall of the driven gear 9. The driven gear 9 is floatingly installed in the annular groove of the pump body 2. The radial direction of the driven gear 9 is positioned by the inner hole of the annular groove of the pump body 2. The lubricating oil groove communicated with the high-pressure oil cavity can convey the transmission oil in the high-pressure oil cavity to the fitting clearance between the driven gear 9 and the inner hole of the annular groove of the pump body 2 to achieve the lubrication purpose. The axial direction of the driven gear 9 is positioned by the pump body 2 and the pump cover 10.

[0031] The driving gear 8 is of an external gear structure. The driving gear 8 is installed on the positioning seat 15 through the second bearing 7. Specifically, the outer ring of the second bearing 7 is installed in the inner hole of the driving gear 8 with interference fit. The positioning seat 15 is of a boss structure and contains a convex part. The convex part penetrates through the pump cover 10, and the inner ring of the second bearing 7 has a clearance fit with the convex part of the positioning seat 15 to achieve the radial positioning of the driving gear 8. The external teeth of the driving gear 8 mesh with the internal teeth of the driven gear 9. The axial positioning of the driving gear 8 is achieved through the pump body 2 and the pump cover 10. The positioning seat 15 is placed outside the pump cover 10 and is used for fixedly installing on the gearbox housing 16. The positioning seat 15 is fixedly connected with the pump body 2 and the pump cover 10 through the second bolt 11, and the second bolt 11 penetrates through the pump body 2 and the pump cover 10.

[0032] It can be understood that in other embodiments, the pump cover 10 and the positioning seat 15 can also be combined into one part as the gear pump cover, and the oil passage can be built into the pump cover to realize the functions of the gear pump discharging oil, the torque converter inletting oil and the torque converter outlettng oil.

[0033] The setting of the positioning seat 15 and the second bearing 7, and by changing the structure of the driving gear 8 of the gear pump, the positioning method of the driving gear 8 is changed. The driving gear 8 no longer relies on the torque converter 13 for positioning support. The positioning support of the driving gear 8 relies on the positioning seat 15, effectively improving the positioning accuracy of the driving gear 8, reducing the control requirements for the manufacturing accuracy of other parts of the gearbox, and further reducing the manufacturing cost of the gearbox. Moreover, the improvement of the positioning accuracy of the driving gear 8 can effectively improve the service life and reliability of the gear pump, and at the same time reduce the operating noise of the gearbox, meeting the requirement of the whole machine for low noise.

[0034] As Figure 2 shown, a plurality of tooth grooves 81 are arranged at intervals along the circumferential direction at the inner hole of the driving gear 8. The tooth grooves 81 penetrate through the driving gear 8, and the cross-section of the tooth grooves 81 is rectangular. One side of the tooth grooves 81 is open and the opening side is blocked by the outer ring of the second bearing 7. The tooth grooves 81 are used as the oil passage of the torque converter 13 inlet. On the basis of realizing the oil supply of the gear pump and the built-in lubricating oil path, the structure of the gear pump is made more compact to meet the built-in installation requirements. At the same time, it is also used as the driving structure for the torque converter 13 to drive the driving gear 8 of the gear pump to rotate. The tooth grooves 81 can be connected with driving units such as the torque converter 13 through connecting parts (such as connecting structures like the tooth pick 14, the lever, etc.).

[0035] A crescent plate 12 is fixedly arranged in the annular groove of the pump body 2. The crescent plate 12 is located between the driving gear 8 and the driven gear 9 and is used to divide the cavity formed by the tooth profiles of the driving gear 8 and the driven gear 9 into two cavities, thereby forming two cavities to serve as the low-pressure chamber and the high-pressure chamber of the gear pump.

[0036] A sealing ring groove is formed in the outer wall of the pump body 2, and the first sealing ring 1 is fixedly installed in the sealing ring groove to seal the clearance between the gear pump and the mounting hole of the gearbox. A mounting hole is formed in the pump body 2, and the mounting hole is coaxially arranged with the annular groove. The mounting hole has a stepped hole structure, and the first bearing 5 and the second sealing ring 6 are both fixedly installed in the mounting hole.

[0037] Specifically, the outer ring of the first bearing 5 is in interference fit with the mounting hole. The first bearing 5 is mainly used for the installation and support of the torque converter 13. The second sealing ring 6 is located inside the mounting hole (i.e., on the side close to the driving gear 8) and is mainly used to block the lubricating oil and assist in supporting the torque converter 13.

[0038] It can be understood that the second sealing ring 6 includes but is not limited to sealing rings, sealing gaskets, metal rings, bushings and other similar sealing function structures, and can be specifically selected according to actual needs, and no excessive restrictions are made here.

[0039] The oil seal 4 is a rotary sealing structure. The oil seal 4 is fixedly installed at the end face of the pump body 2 where the mounting hole is provided. The internal lubricating oil of the gear pump is sealed by the oil seal 4 and the outer circle of the torque converter to achieve the sealing of the lubricating oil. The lubricating oil can flow to the gearbox through the oil drain hole on the pump body 2.

[0040] Embodiment 2

[0041] In a typical implementation manner of the present utility model, as Figure 3 shown, a gearbox is proposed, which includes the gear pump, the torque converter 13 and the gearbox housing 16 mentioned in Embodiment 1. Among them, two oppositely arranged shifting teeth 14 are fixedly installed at the output end of the torque converter 13. The cross section of the shifting teeth 14 is rectangular and is used to be inserted into the tooth groove 81 of the driving gear 8 of the gear pump. The torque converter 13 drives the driving gear 8 to rotate through the shifting teeth 14. The cross-sectional dimensions (long side, wide side) of the shifting teeth 14 are smaller than those of the tooth groove 81 to ensure smooth rotation and avoid jamming.

[0042] The positioning seat 15 is fixedly arranged on the gearbox housing 16 by welding or other means and is connected to the pump body 2 and the pump cover 10 through the second bolt 11. The bolt mounting hole is sealed by angular sealing at the orifice. The clearance between the gear pump and the mounting hole of the gearbox is sealed by the first sealing ring 1, and the internal lubricating oil of the gear pump is sealed by the oil seal 4 and the outer circle of the torque converter.

[0043] Specific working principle: Two shifting teeth 14 are symmetrically arranged on the torque converter 13. The shifting teeth 14 are inserted into the inner hole tooth grooves 81 of the driving gear 8 of the gear pump. Through the high-speed rotation of the torque converter 13, the two shifting teeth 14 on the torque converter 13 drive the driving gear 8 of the gear pump to rotate. The driving gear 8 meshes with the inner teeth of the driven gear 9 through external teeth, and the driving gear 8 drives the driven gear 9 to rotate synchronously. During the synchronous rotation of the driving gear 8 and the driven gear 9, the change in the cavity volume formed between the tooth profiles of the two gears and the crescent plate 12 on the pump body 2 forms the high-pressure chamber and the low-pressure chamber of the gear pump. The low-pressure chamber sucks the transmission oil from the gearbox, and the oil is transported to the high-pressure chamber through the rotation of the driving and driven gears. The transmission oil in the high-pressure chamber reaches the shift valve and the torque converter through the pressure oil passage to hydraulically control and lubricate the various components of the gearbox.

[0044] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An internal gear pump, comprising: A pump body (2), a pump cover (10), a driving gear (8) and a driven gear (9) installed in the pump body (2), the driven gear (9) being an internal gear and the driving gear (8) being an external gear. It is characterized in that the driven gear (9) is floatingly installed in an annular groove of the pump body (2), the external teeth of the driving gear (8) mesh with the internal teeth of the driven gear (9), the driving gear (8) is rotationally connected to a positioning seat (15) through a second bearing (7), the positioning seat (15) is a boss structure, the positioning seat (15) is located outside the pump cover (10) and fixedly connected to the pump cover (10), and a plurality of tooth grooves (81) are arranged at intervals along the circumferential direction of the inner hole of the driving gear (8), and the tooth grooves (81) are used to be connected to a driving unit through a connecting member.

2. The internal gear pump according to claim 1, characterized in that, The outer ring of the second bearing (7) is press-fitted into the inner hole of the driving gear (8), and the inner ring of the second bearing (7) has a clearance fit with the convex part of the positioning seat (15).

3. The internal gear pump according to claim 2, characterized in that, The tooth grooves (81) penetrate through the driving gear (8), the cross-section of the tooth grooves (81) is rectangular, one side of the tooth grooves (81) is open and the open side is blocked by the outer ring of the second bearing (7), and some of the tooth grooves (81) are used as oil channels.

4. The internal gear pump according to claim 1, characterized in that, A crescent plate (12) is fixedly arranged in the annular groove of the pump body (2), and the crescent plate (12) is located between the driving gear (8) and the driven gear (9).

5. The internal gear pump according to claim 1, characterized in that, A sealing ring groove is formed on the outer wall of the pump body (2), and a first sealing ring (1) is fixedly arranged in the sealing ring groove.

6. The internal gear pump according to claim 1, characterized in that, An installation hole is formed in the pump body (2), the installation hole is coaxially arranged with the annular groove, the installation hole is a stepped hole structure, a first bearing (5) and a second sealing ring (6) are fixedly arranged in the installation hole, and the second sealing ring (6) is located inside the installation hole.

7. The internal gear pump according to claim 6, characterized in that, An oil seal (4) is detachably installed at the end face of the pump body (2) where the installation hole is located.

8. A gearbox, characterized in that, Including an internal meshing gear pump, a torque converter (13) and a gearbox housing (16) according to any one of claims 1-7, two oppositely arranged shift teeth (14) are fixedly arranged at the output end of the torque converter (13), the shift teeth (14) are inserted into the tooth grooves (81), and the positioning seat (15) is fixedly arranged on the gearbox housing (16).

9. The gearbox according to claim 8, characterized in that, The cross-sectional dimension of the shift teeth (14) is smaller than that of the tooth grooves (81).

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