CN219176895U

CN219176895U - Oil pump for hydraulic automatic transmission and hydraulic automatic transmission

Info

Publication number: CN219176895U
Application number: CN202222556803.8U
Authority: CN
Inventors: 冯永明; 张其帅; 台格润; 王凯峰; 赵会强; 刘义
Original assignee: Shaanxi Fast Gear Co Ltd
Current assignee: Shaanxi Fast Gear Co Ltd
Priority date: 2022-09-23
Filing date: 2022-09-23
Publication date: 2023-06-13
Anticipated expiration: 2032-09-23

Abstract

The utility model discloses an oil pump for a hydraulic automatic transmission and the hydraulic automatic transmission, wherein the oil pump comprises an oil pump shell, and the oil pump shell is detachably connected with a transmission supporting plate; a driving shaft and a driven shaft are arranged in the oil pump shell, and two ends of the driving shaft and the driven shaft are respectively connected with the oil pump shell and the speed changer supporting plate; the driving shaft is sleeved with an oil pump driving gear, the driven shaft is sleeved with an oil pump driven gear, and the oil pump driving gear and the oil pump driven gear are meshed; an oil pump driving gear is arranged outside the oil pump shell, and the oil pump driving gear is sleeved on the driving shaft; the oil pump driving gear is meshed with a central wheel of the automatic transmission; the number of teeth of the central wheel is larger than that of the oil pump driving gear. The structure effectively controls the size of the oil pump, and is beneficial to the arrangement of the oil pump in the transmission. In addition, the speed ratio of the center wheel to the oil pump driving gear is smaller than 1, so that the requirement of the transmission on large flow is met.

Description

Oil pump for hydraulic automatic transmission and hydraulic automatic transmission

Technical Field

The utility model belongs to the technical field of automatic transmission oil pumps, and relates to an oil pump for a hydraulic automatic transmission and the hydraulic automatic transmission.

Background

The hydraulic automatic transmission of the commercial vehicle tends to develop to high power, large torque and integration in the special fields of mines, oil fields and the like, and along with the increase of the sizes of friction elements and hydraulic valve elements, the increase of the number of hydraulic elements and rotary elements and the like in the transmission, the flow demand of the transmission for oil liquid is increased in the control and lubrication processes of the transmission, so that the demand of the transmission for oil pump displacement is increased. An automatic transmission oil pump comprising two pairs of external gear wheels, an oil inlet pipe and an oil outlet pipe is adopted to solve the problem at present, wherein one pair of external gear wheels is used for pumping oil, and the other pair of external gear wheels is used for pumping residual lubricating oil in a pump body to the inside of the transmission, so that accumulated oil is prevented from leaking.

The existing automatic transmission is large in oil pump displacement, and can meet the application of the hydraulic automatic transmission of a commercial vehicle in the special fields of mines, oil fields and the like, but the two pairs of externally meshed gears cause the increase of the volume and the increase of the weight, and the outline of the transmission is protruded, so that the whole vehicle is difficult to arrange. Meanwhile, the oil pump is arranged outside the transmission, oil leaked from the oil pump cannot flow back to the bottom of the transmission, and a pair of gear pumps are additionally added to realize oil return. In addition, the arrangement outside the transmission also easily causes oil leakage to the outside, and the oil pump is required to be sealed to avoid the oil leakage, so that the complexity, the weight and the cost of the oil pump design are further increased.

Disclosure of Invention

Aiming at the problems in the prior art, the utility model provides an oil pump for a hydraulic automatic transmission and the hydraulic automatic transmission, so that the technical problem that a large-displacement oil pump is arranged outside the automatic transmission in the prior art is effectively solved.

The utility model is realized by the following technical scheme:

an oil pump for an automatic hydrodynamic transmission includes an oil pump housing detachably connected to a transmission support plate;

a driving shaft and a driven shaft are arranged in the oil pump shell, and two ends of the driving shaft and the driven shaft are respectively connected with the oil pump shell and the transmission supporting plate; the driving shaft is sleeved with an oil pump driving gear, the driven shaft is sleeved with an oil pump driven gear, and the oil pump driving gear and the oil pump driven gear are meshed;

an oil pump driving gear is arranged outside the oil pump shell, and the oil pump driving gear is sleeved on the driving shaft; the oil pump driving gear is meshed with a central wheel of the automatic transmission;

the number of teeth of the central wheel is larger than that of the oil pump driving gear.

Preferably, a groove is formed in the oil pump housing, and the oil pump driving gear and the oil pump driven gear are arranged in the groove.

Preferably, the driving shaft is provided with a second connecting piece, and the inner hole of the driving gear of the oil pump is connected with the driving shaft through the second connecting piece.

Preferably, one end of the driving shaft is provided with a first supporting piece, the other end of the driving shaft is provided with a second supporting piece, a first step hole is formed in the oil pump housing, the first supporting piece is arranged in the first step hole, a second step hole is formed in the transmission supporting plate, and the second supporting piece is arranged in the second step hole.

Preferably, the free end of the first support is provided with a second collar.

Preferably, a shaft shoulder is arranged on the driving shaft, a steel wire check ring is arranged at the shaft shoulder, and the first supporting piece is attached to the shaft shoulder and the steel wire check ring.

Preferably, a third connecting piece is arranged on the driven shaft, and an inner hole of the driven gear of the oil pump is connected with the driven shaft through the third connecting piece.

Preferably, a fourth supporting piece is arranged at one end of the driven shaft, a third supporting piece is arranged at the other end of the driven shaft, a third step hole is formed in the oil pump housing, the fourth supporting piece is arranged in the third step hole, a fourth step hole is formed in the transmission supporting plate, and the third supporting piece is arranged in the fourth step hole.

Preferably, the driving shaft is further provided with a first connecting piece, the oil pump driving gear is connected with the driving shaft through the first connecting piece, and the free end of the oil pump driving gear is further provided with a first check ring.

A hydraulic automatic transmission comprises the oil pump.

Compared with the prior art, the utility model has the following beneficial technical effects:

the utility model provides an oil pump for hydraulic automatic transmission, automatic transmission's backup pad is as part of the oil pump, forms the cavity that holds oil pump driving gear and oil pump driven gear with the oil pump shell, has cancelled an end cover of oil pump among the prior art, has effectively controlled the size of oil pump, places the one end of driving shaft and driven shaft in the derailleur backup pad, has shortened the whole axial dimension of oil pump, is favorable to the arrangement of oil pump in the derailleur. In addition, aiming at the requirement of large discharge capacity, in the design of the oil pump driving gear, the number of teeth of the oil pump driving gear is smaller than that of the central gear, so that the speed ratio of the central gear to the oil pump driving gear is smaller than 1, the oil pump can obtain larger discharge capacity from the central gear, and the requirement of the transmission on large flow capacity is met.

Furthermore, the design of the inner groove of the oil pump shell is beneficial to the arrangement of the driving gear of the oil pump and the driven gear of the oil pump.

Further, the second retainer ring is arranged, so that the axial limiting of the first supporting piece is facilitated.

Further, the arrangement of the steel wire check ring is beneficial to limiting the axial direction of the driving shaft.

Further, the arrangement of the first check ring is beneficial to limiting the axial direction of the oil pump driving gear.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a sectional view showing the structure of an oil pump for a hydraulic automatic transmission according to the present utility model;

FIG. 2 is a diagram showing a driving connection of an oil pump for a hydraulic automatic transmission according to the present utility model;

fig. 3 is a schematic view of an oil passage of an oil pump for a hydraulic automatic transmission according to the present utility model.

Wherein: 1. the transmission comprises a transmission support plate, 2, an oil pump housing, 3, an oil pump driving gear, 4, a driving shaft, 5, a driven shaft, 6, an oil pump driven gear, 7, an oil pump driving gear, 8, a first support piece, 9, a wire retainer ring, 10, a first retainer ring, 11, a first connecting piece, 12, a second retainer ring, 13, a second connecting piece, 14, a third connecting piece, 15, a second support piece, 16, a third retainer ring, 17, a third support piece, 18, a fourth support piece, 19, a bolt, 20, a central wheel, 21, a transmission center, 22, an oil inlet, 23, an oil inlet oil duct, 24, an oil outlet, 25 and an oil outlet oil duct.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the embodiments of the present utility model, it should be noted that, if the terms "upper," "lower," "horizontal," "inner," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the term "horizontal" if present does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The utility model is described in further detail below with reference to the attached drawing figures:

as shown in fig. 1, an oil pump for a hydrodynamic automatic transmission includes an oil pump housing 2, the oil pump housing 2 being detachably connected to a transmission support plate 1; a driving shaft 4 and a driven shaft 5 are arranged in the oil pump housing 2, and two ends of the driving shaft 4 and the driven shaft 5 are respectively connected with the oil pump housing 2 and the transmission support plate 1; the driving shaft 4 is sleeved with an oil pump driving gear 3, the driven shaft 5 is sleeved with an oil pump driven gear 6, and the oil pump driving gear 3 and the oil pump driven gear 6 are meshed; an oil pump driving gear 7 is arranged outside the oil pump housing 2, and the oil pump driving gear 7 is sleeved on the driving shaft 4; the oil pump driving gear 7 is meshed with a central wheel 20 of the automatic transmission; the number of teeth of the center wheel 20 is larger than that of the oil pump drive gear 7.

The transmission supporting plate 1 is one of the shells of the hydraulic automatic transmission of the commercial vehicle and is fixedly connected with other shells of the transmission, and the large-displacement oil pump is used as a part arranged on the transmission supporting plate 1 to provide oil for the hydraulic automatic transmission. The transmission support plate 1 is provided with two stepped holes, two positioning holes and a plurality of threaded holes on the area where the oil pump is installed. The rear end of the oil pump housing 2 is provided with a groove inside which the oil pump driving gear 3 and the oil pump driven gear 6 are disposed. Two positioning holes are formed in the end face of the rear end of the oil pump housing 2, a plurality of bolt through holes are formed in the positions, two step holes are formed in the front end of the oil pump housing 2, and the two step holes are communicated with the groove structure. The oil pump driving gear 3 is an external gear, on which tooth tops, tooth width end faces and inner holes are arranged, and may be an involute external gear. The driving shaft 4 is used for inputting power of the oil pump and is provided with two shaft shoulders. The oil pump driven gear 6 is an external gear, preferably an involute external gear, and more preferably an involute external gear identical to the oil pump driving gear 3.

The oil pump housing 2 is fixedly connected to the transmission support plate 1 by bolts 19, is connected to the transmission support plate 1 by positioning pins, and ensures an accurate positional relationship. The oil pump driving gear 3 and the oil pump driven gear 6 are arranged inside the oil pump housing 2, are radially constrained by the side wall of the groove of the oil pump housing 2, are axially constrained by the transmission support plate 1 and can rotate freely, and the tooth width end face and the tooth top of the oil pump driving gear and the front end face of the transmission support plate 1 and the bottom surface of the groove of the oil pump housing 2 form a sealing cavity together to ensure oil absorption and oil pressing. The oil pump driving gear 3 and the oil pump driven gear 6 have a certain position relationship, and can realize correct meshing transmission, thereby realizing oil pumping. The inner hole of the oil pump driving gear 3 is connected with the driving shaft 4 through a second connecting piece 13, the preferred second connecting piece 13 can be a key, the oil pump driving gear 3 rotates together with the driving shaft 4, and the oil pump driving gear 3 has no position constraint in the axial direction, so that the eccentric wear of the oil pump driving gear 3 caused by over constraint is avoided, and the easy disassembly is ensured. The driving shaft 4 is supported at both ends, and the front end is supported through first support piece 8, and the rear end is supported through second support piece 15, and wherein first support piece 8 is installed in the step hole of oil pump housing 2 front end to carry out spacingly through second retaining ring 12, second support piece 15 is installed in the step hole of derailleur backup pad 1, and both ends support and ensure that oil pump driving gear 3 central point puts accuracy, good operation. The driving shaft 4 is provided with a shaft shoulder, a steel wire check ring 9 is arranged at the shaft shoulder, and the first supporting piece 8 is attached to the shaft shoulder and the steel wire check ring 9. Namely, the first supporting piece 8 is attached to the shaft shoulder of the driving shaft 4 and the steel wire check ring 9 to limit the driving shaft 4 axially. The preferred first supporting member 8 may be a rolling bearing, the preferred second supporting member 15 may be a needle bearing or a sliding bearing, the oil leaked from the tooth width end face of the driving gear 3 of the oil pump may lubricate the first supporting member 8 and the second supporting member 15, and the lubricated oil flows back to the bottom of the transmission through the stepped hole of the transmission supporting plate 1.

The driven shaft 5 is provided with a third connecting piece 14, the driven shaft 5 is connected with the oil pump driven gear 6 through the third connecting piece 14, the axial position of the driven shaft 5 is restrained by a third check ring 16, the preferable third connecting piece 14 can be a key, the two ends of the driven shaft 5 are supported, the front end is supported by a fourth supporting piece 18, the rear end is supported by a third supporting piece 17, the fourth supporting piece 18 is arranged in a stepped hole at the front end of the oil pump housing 2, the third supporting piece 17 is arranged in a stepped hole of the transmission supporting plate 1, and the two ends are supported to ensure that the central position of the oil pump driven gear 6 is accurate and well operated. The fourth support 18 and the third support 17 can be needle bearings or sliding bearings, and the oil leaked from the tooth width end face of the driven gear 6 of the oil pump can lubricate the fourth support 18 and the third support 17, and the lubricated oil flows back to the bottom of the transmission through the step hole at the front end of the oil pump housing 2 and the step hole of the transmission support plate 1.

The oil pump driving gear 7 is connected with the driving shaft 4 through a first connecting piece 11, and is limited at the front end through a first check ring 10, and is limited at the rear end through a shaft shoulder of the driving shaft 4. The preferred first connector 11 may be a key. In the utility model, the first connecting piece 11, the second connecting piece 13 and the third connecting piece 14 can be components with identical structural dimensions, the second supporting piece 15, the third supporting piece 17 and the fourth supporting piece 18 can be components with identical structural dimensions, thereby reducing the types of components of the large-displacement oil pump and lowering the overall cost.

In the utility model, the transmission support plate 1 is taken as a part of the large-displacement oil pump, forms a cavity for accommodating the oil pump driving gear 3 and the oil pump driven gear 6 together with the oil pump housing 2, eliminates the end cover of the oil pump in the prior art, places the support of the driving shaft 4 and the driven shaft 5 in the transmission support plate 1, shortens the overall axial dimension of the large-displacement oil pump, and is beneficial to the arrangement of the large-displacement oil pump in the transmission. The large-displacement oil pump is arranged near the center 21 of the transmission and is positioned higher than the oil pan at the bottommost part of the transmission, and excessive oil leaked from the oil pump can flow back to the bottom of the transmission, so that oil accumulation is avoided.

The utility model also discloses a hydraulic automatic transmission, which comprises the oil pump.

As shown in fig. 2, the center wheel 20 is directly driven by the prime mover, rotates around the transmission center 21, and is in mesh transmission with the oil pump drive gear 7. The oil pump driving gear 7 is fixedly connected to the driving shaft 4 through a first connecting piece 11, and drives the oil pump driving gear 3 to rotate. The oil pump driving gear 7 has a fixed position relation with the center wheel 20, so that the gear is ensured to be meshed correctly and transmitted stably. The number of teeth of the central wheel 20 is different from that of the oil pump driving gear 7, the number of teeth of the central wheel 20 is larger than that of the oil pump driving gear 7, the speed ratio of the central wheel 20 to the oil pump driving gear 7 is smaller than 1, and the rotation speed of the oil pump driving gear 7 is accelerated from the prime motor. As defined by the displacement, the oil pump displacement is equal to the volume of liquid displaced per revolution of the oil pump driving gear 3. The speed ratio of the center wheel 20 and the oil pump driving gear 7 is smaller than 1, the number of turns of the oil pump driving gear 3 is larger than 1 turn when the prime motor drives the center wheel 20 to rotate once, and the oil pump obtains larger displacement from the center wheel 20. Because the speed ratio of the center wheel 20 and the oil pump driving gear 7 is smaller than 1, the oil pump can obtain larger displacement, the requirement of the transmission on large flow is met, meanwhile, the occupied volume of the oil pump under a certain displacement is smaller, the size of the oil pump is smaller, and the arrangement of the oil pump in the transmission is easier to realize.

As shown in fig. 3, the oil pump housing 2 is not provided with a separate oil inlet and outlet, and forms an oil inlet 22 and an oil outlet 24 together with the transmission support plate 1. The oil inlet 22 is communicated with the oil inlet oil duct 23, the oil inlet oil duct 23 is arranged in the transmission supporting plate 1, and the oil inlet oil duct 23 is preferably a closed built-in oil duct. The oil outlet 24 is communicated with an oil outlet channel 25, the oil outlet channel 25 is arranged in the transmission supporting plate 1, and the oil outlet channel 25 is preferably a closed built-in oil channel. The oil inlet and outlet of the large-displacement oil pump is formed by the oil pump shell 2 and the transmission support plate 1, the oil inlet and outlet channel is integrated in the transmission support plate 1, and meanwhile, the independent oil inlet and outlet channel and the closed oil inlet and outlet channel are eliminated on the oil pump, so that the arrangement of the oil pump is more compact, and the volume is smaller

The utility model provides a large displacement oil pump of commercial car hydraulic automatic transmission, it contains a pair of external gear, and the oil pump integration is arranged in the derailleur backup pad, has saved the oil pump end cover, and is smaller. Meanwhile, a pair of external meshing gears are adopted to speed up the oil pump gear, so that the oil pump displacement is increased. In addition, due to the downsizing, the oil pump is built in the transmission, and the oil pump can only perform internal leakage without external leakage. Meanwhile, the oil pump is arranged near the center of the transmission, so that the problem that leaked oil in the oil pump cannot flow back to the bottom of the transmission freely is solved. Therefore, the technical scheme adopted by the application reduces the size of the oil pump and the weight and cost of the oil pump while meeting the high-flow demand of the transmission, so that the arrangement of the oil pump transmission is more convenient and compact, and the matching property of the transmission is improved.

The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An oil pump for an automatic hydrodynamic transmission, characterized by comprising an oil pump housing (2), the oil pump housing (2) being detachably connected to a transmission support plate (1);

a driving shaft (4) and a driven shaft (5) are arranged in the oil pump housing (2), and two ends of the driving shaft (4) and the driven shaft (5) are respectively connected with the oil pump housing (2) and the transmission supporting plate (1); an oil pump driving gear (3) is sleeved on the driving shaft (4), an oil pump driven gear (6) is sleeved on the driven shaft (5), and the oil pump driving gear (3) and the oil pump driven gear (6) are meshed;

an oil pump driving gear (7) is arranged outside the oil pump housing (2), and the oil pump driving gear (7) is sleeved on the driving shaft (4); the oil pump driving gear (7) is meshed with a central wheel (20) of the automatic transmission;

the number of teeth of the central wheel (20) is larger than that of the oil pump driving gear (7).

2. An oil pump for a hydrodynamic automatic transmission according to claim 1, characterized in that the oil pump housing (2) is internally provided with a recess, the oil pump driving gear (3) and the oil pump driven gear (6) being provided inside the recess.

3. The oil pump for the hydraulic automatic transmission according to claim 1, wherein the driving shaft (4) is provided with a second connecting piece (13), and the inner hole of the oil pump driving gear (3) is connected with the driving shaft (4) through the second connecting piece (13).

4. An oil pump for a hydraulic automatic transmission according to claim 1, characterized in that one end of the driving shaft (4) is provided with a first support member (8) and the other end is provided with a second support member (15), the inside of the oil pump housing (2) is provided with a first stepped hole, the first support member (8) is arranged in the first stepped hole, the transmission supporting plate (1) is provided with a second stepped hole, and the second support member (15) is arranged in the second stepped hole.

5. An oil pump for a hydrodynamic automatic transmission according to claim 4, characterized in that the free end of the first support (8) is provided with a second collar (12).

6. The oil pump for the hydraulic automatic transmission according to claim 4, wherein a shaft shoulder is arranged on the driving shaft (4), a steel wire check ring (9) is arranged at the shaft shoulder, and the first supporting piece (8) is attached to the shaft shoulder and the steel wire check ring (9).

7. The oil pump for the hydraulic automatic transmission according to claim 1, wherein a third connecting piece (14) is arranged on the driven shaft (5), and an inner hole of the driven gear (6) of the oil pump is connected with the driven shaft (5) through the third connecting piece (14).

8. An oil pump for a hydrodynamic automatic transmission according to claim 1, characterized in that one end of the driven shaft (5) is provided with a fourth support member (18) and the other end is provided with a third support member (17), the inside of the oil pump housing (2) is provided with a third stepped hole, the fourth support member (18) is disposed in the third stepped hole, the transmission support plate (1) is provided with a fourth stepped hole, and the third support member (17) is disposed in the fourth stepped hole.

9. An oil pump for a hydrodynamic automatic transmission according to claim 1, characterized in that the driving shaft (4) is further provided with a first connecting piece (11), the oil pump driving gear (7) is connected with the driving shaft (4) through the first connecting piece (11), and the free end of the oil pump driving gear (7) is further provided with a first retainer ring (10).

10. A hydraulic automatic transmission comprising the oil pump according to any one of claims 1 to 9.