Hub reduction gear with small tooth difference

Abstract

The utility model relates to a small-tooth-difference hub reduction gear which comprises a connecting hub assembly, a small-tooth-difference reduction assembly and a wet brake assembly. The connecting hub assembly comprises a supporting shaft (26) connected with a drive axle housing, a hub (27) rotationally arranged on the supporting shaft (26) and a connecting hub (13) fixedly connected with the hub (27). The left eccentric sleeve (5) and the right eccentric sleeve (31) are arranged on the drive axle input shaft (30) in a sleeving mode through splines, the left gear (2) and the right gear (17) are rotationally arranged on the left eccentric sleeve (5) and the right eccentric sleeve (31) through a left supporting bearing A (3) and a right supporting bearing A (15) respectively, and the inner gear ring (14) is arranged on the inner ring of the connecting hub (13) and meshed with the left gear (2) and the right gear (17). The transmission is small in size, compact in structure and large in transmission ratio.

Description

Technical Field

[0001] The utility model relates to the technical field of reducers, in particular to a small-tooth differential wheel-side reducer for a wet brake drive axle of a scraper. Background Art

[0002] The wheel-side reducer is an important part of the wet brake bridge of the scraper. The wet brake bridge refers to the brake components installed inside the bridge to achieve the braking function. The drive axle has two stages of reduction: the main reduction and the wheel-side reduction. For the entire drive axle, if the reduction ratio of the wheel-side reduction is relatively small, the reduction ratio of the main reduction needs to be larger, which inevitably increases the design size of the main reduction. The reduction ratio of the main reduction is relatively large, and its output torque is relatively large. For the drive shaft, the torque it bears increases accordingly, and it is more likely to be twisted off during operation, causing engineering accidents. Therefore, in the design process, the wheel-side reduction ratio should be increased as much as possible, and the main reduction ratio should be reduced. However, as the wheel-side reduction ratio increases, the wheel size will also increase, and the space under the vehicle is limited, making it difficult to achieve. Therefore, a wheel-side reducer with small size, compact structure and large transmission ratio is required. Summary of the invention

[0003] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide a wheel-side reducer with small size, compact structure and large transmission ratio.

[0004] The purpose of the utility model is achieved in this way:

[0005] A wheel-side reducer with a small tooth difference comprises a connecting hub assembly, a small tooth difference reduction assembly and a wet brake assembly;

[0006] The connecting hub assembly comprises a supporting shaft connected to the driving axle housing, a wheel hub rotatably arranged on the supporting shaft, a connecting hub fixedly connected to the wheel hub, and a left end cover fixedly mounted on the left end of the connecting hub by a connecting bolt A;

[0007] The small-tooth difference reduction assembly comprises a left eccentric sleeve and a right eccentric sleeve mounted on the input shaft of the drive axle through a spline sleeve, a left gear and a right gear respectively rotatably arranged on the left eccentric sleeve and the right eccentric sleeve through a left support bearing A and a right support bearing A, and an inner gear ring arranged on the inner ring of the connecting hub and meshing with the left gear and the right gear; the left eccentric sleeve and the right eccentric sleeve are eccentric cams with the same structure and size, and the installation phases of the two differ by 180°; the left gear and the right gear have the same structure and size, and the number of teeth and the modulus are equal, and a plurality of groups of tooth holes are evenly arranged on the left gear and the right gear, and shaft pins are embedded in the tooth holes; the left and right ends of the shaft pin are respectively connected to the left end cover and the supporting shaft through a left support frame and a right support frame;

[0008] The wet brake assembly comprises a friction plate group which is respectively connected to the supporting shaft and the input shaft and produces a braking effect on the input shaft.

[0009] Furthermore, a top pin is provided on the left end cover, and the top pin cooperates with the adjustment support arranged at the end of the input shaft to form a stable limit support.

[0010] Furthermore, the left end cover is rotatably arranged on the left support frame through the left support bearing B; the right support frame is fixedly mounted on the supporting shaft through the connecting bolt B.

[0011] Furthermore, the left eccentric sleeve and the right eccentric sleeve are separated by a sleeve sleeved on the input shaft.

[0012] Furthermore, six groups of tooth holes are arranged on the left gear and the right gear.

[0013] Furthermore, the number of teeth of the left gear and the right gear is 1 to 2 teeth less than the number of teeth of the inner ring gear.

[0014] Furthermore, the axle pin is sleeved with an axle pin sleeve.

[0015] Furthermore, the friction plate group includes an active friction plate connected to the supporting shaft through a friction plate holder and a driven friction plate connected to the input shaft through a shaft sleeve; a piston is movably arranged between the supporting shaft and the friction plate group; the active friction plate and the driven friction plate are pushed and fitted together by the piston, thereby braking the input shaft.

[0016] Furthermore, the support shaft is provided with an oil inlet which is communicated with the oil passage inside the support shaft to provide braking force to the piston.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The utility model arranges a transmission chain formed by an eccentric sleeve, gears, axle pins and an inner gear ring between the input shaft of the drive bridge and the wheel hub connecting hub, utilizes the input shaft to drive the eccentric sleeve to rotate eccentrically, and through the axle pin fixedly arranged in the gear tooth hole, the eccentric sleeve drives the gear to rotate around the axle pin, and transmits the torque to the inner gear ring for rotation, and then outputs the torque of the input shaft to the wheel hub, thereby achieving the purpose of high transmission ratio driving; the overall structure is simple and compact, the transmission ratio is high, the transmission efficiency is high, the space occupied is small, and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a schematic cross-sectional structure diagram of a small-tooth differential wheel reducer.

[0020] Figure 2 The utility model is a schematic diagram of the mechanism movement of a small-tooth differential wheel reducer.

[0021] in:

[0022] Axle pin 1, left gear 2, left support bearing A3, sleeve 4, left eccentric sleeve 5, left retaining spring 6, top pin 7, adjustment pillar 8, left support bearing B9, support frame 10, left end cover 11, connecting bolt A12, connecting hub 13, inner ring 14, right support bearing A15, friction plate baffle 16, right gear 17, right support frame 18, right retaining spring 19, friction plate holder 20, active friction plate 21, driven friction plate 22, connecting bolt B23, spring 24, piston 25, supporting shaft 26, wheel hub 27, right support bearing B28, oil inlet 29, input shaft 30, right eccentric sleeve 31, sleeve 32, axle pin sleeve 33. DETAILED DESCRIPTION

[0023] See also Figure 1-2 The utility model relates to a small-tooth difference wheel-side reducer, comprising a connecting hub assembly, a small-tooth difference reduction assembly and a wet brake assembly;

[0024] The connecting hub assembly comprises a supporting shaft 26 connected to the driving axle housing, a hub 27 rotatably arranged on the supporting shaft 26 via a right supporting bearing B28, a connecting hub 13 fixedly connected to the hub 27, and a left end cover 11 fixedly mounted on the left end of the connecting hub 13 via a connecting bolt A12; a top pin 7 is arranged on the left end cover 11, which cooperates with an adjusting support 8 arranged at the end of the input shaft 30 to form a stable limiting support;

[0025] The small-tooth difference reduction assembly comprises a left eccentric sleeve 5 and a right eccentric sleeve 31 mounted on the input shaft 30 of the drive axle through a spline sleeve, a left gear 2 and a right gear 17 respectively rotatably arranged on the left eccentric sleeve 5 and the right eccentric sleeve 31 through a left support bearing A3 and a right support bearing A15, and an inner gear ring 14 arranged on the inner ring of the connecting hub 13 and meshing with the left gear 2 and the right gear 17;

[0026] The left eccentric sleeve 5 and the right eccentric sleeve 31 are eccentric cams with the same structure and size, and the installation phases of the two are 180° apart; the left eccentric sleeve 5 and the right eccentric sleeve 31 are separated by a sleeve 4 sleeved on the input shaft 30, and a left retaining spring 6 is installed on the input shaft 30 on the left side of the left eccentric sleeve 5 to limit the left end of the left eccentric sleeve 5, and a shaft sleeve 32 is installed on the input shaft 30 on the right side of the right eccentric sleeve 31 to limit the right end of the right eccentric sleeve 31;

[0027] The left gear 2 and the right gear 17 have the same structural dimensions and the same tooth modulus. The number of teeth of the left gear 2 and the right gear 17 is 1 to 2 less than that of the inner gear ring 14; six groups of tooth holes are evenly distributed on the left gear 2 and the right gear 17, and an axle pin 1 is embedded in each tooth hole, and an axle pin sleeve 33 in contact with the inner ring of the tooth hole is mounted on the axle pin 1; the left and right ends of the axle pin 1 are supported and connected to the left end cover 11 and the support shaft 26 through the left support frame 10 and the right support frame 18 respectively; specifically, the left support frame 10 is rotatably set on the left end cover 11 through the left support bearing B9, and the right support frame 18 is fixed on the support shaft 26 through the connecting bolt B23; the pin shaft 1, the left support frame 10, the right support frame 18 and the support shaft 26 are fixed parts, which are connected to the drive axle housing and do not move relative to each other;

[0028] The tooth hole size of the left gear 2 and the right gear 17 is related to the eccentric distance of the left eccentric sleeve 5 and the right eccentric sleeve 31 and the thickness of the shaft pin sleeve 33, and its size is:

[0029] a=2b+h

[0030] Wherein, a is the diameter of the tooth holes of the left gear 2 and the right gear 17, b is the eccentric distance between the left eccentric sleeve 5 and the right eccentric sleeve 31, and h is the thickness of the shaft pin sleeve 32.

[0031] The transmission ratio of the small-tooth differential gear reducer is:

[0032]

[0033] In the formula, Z1 is the number of teeth of the left gear 2, Z2 is the number of teeth of the inner gear ring 14, and H is the input shaft 30. Since the number of teeth of the left gear 2 is 1-2 less than that of the inner gear ring 14, that is, the difference of Z1-Z2 is 1 or 2, the transmission ratio of this embodiment is relatively high, and the transmission chain is simpler than the traditional structure, has high transmission efficiency, occupies less space, and saves material costs;

[0034] The inner gear ring 14 is connected to the inner ring of the connecting hub 13 via a spline, and a right retaining spring 19 is provided on the inner ring of the connecting hub 13 for limiting the installation of the inner gear ring 14;

[0035] The wet brake assembly comprises a friction plate group connected to the support shaft 26 and the input shaft 30 respectively and exerting a braking effect on the input shaft 30, a piston 25 movably arranged between the support shaft 26 and the friction plate group, and a friction plate baffle 16 located on the left side of the friction plate group and fixedly mounted on the right support frame 18; the friction plate group comprises an active friction plate 21 connected to the support shaft 26 through a friction plate holder 20, and a driven friction plate 22 connected to the input shaft 30 through a sleeve 32; a spring 24 for resetting the piston 25 is arranged between the friction plate holder 20 and the piston 25; an oil inlet 29 is arranged on the support shaft 26, which is communicated with the oil channel inside the support shaft 26 to provide braking force to the piston 25; the active friction plate 21 and the driven friction plate 22 are pushed and fitted together by the piston 25 to exert a braking effect on the input shaft 30;

[0036] Working principle: the torque input by the input shaft 30 is transmitted to the left eccentric sleeve 5 and the right eccentric sleeve 31 through the spline. Since the shaft pin 1 is a fixed part, the left gear 2 and the right gear 17 rotate around the six shaft pins 1 through the tooth holes due to the eccentric action, and transmit the torque to the inner ring 14; the inner ring 14 is connected to the connecting hub 13 through the spline to output the torque. The wheel-side reducer of the utility model has a simple and compact structure, only requires fewer transmission chains to achieve a larger transmission ratio, has high transmission efficiency, occupies less space, and saves material costs.

[0037] Braking principle: Hydraulic oil enters from the oil inlet 29, enters the oil chamber through the oil channel, pushes the piston 25 to move, makes the active friction plate 21 fit with the driven friction plate 22, and achieves the same speed of the driven friction plate 22 and the active friction plate 21 through friction force, thereby causing a constraint binding between the input shaft 30 and the support shaft 26 and stopping the rotation, thus achieving the braking of the input shaft 30. When the brake is canceled, the hydraulic oil is depressurized, the spring 24 pushes the piston 25 to reset, the active friction plate 21 is separated from the driven friction plate 22, the constraint between the input shaft 30 and the support shaft 26 is released, and the torque transmission state during normal operation is restored.

[0038] The small-tooth-difference wheel-side reducer of the utility model can be applied not only to the drive axle of a scraper, but also to the drive axle of other vehicles requiring a wheel-side reducer with a small volume and a high transmission ratio.

[0039] In addition: It should be noted that the above specific implementation is only an optimization scheme of this patent. Any changes or improvements made by technicians in this field based on the above concept are within the scope of protection of this patent.

Claims

1. A gear reducer with a small tooth difference, characterized in that: It includes a connecting hub assembly, a small-tooth difference reduction assembly and a wet brake assembly; The connecting hub assembly comprises a supporting shaft (26) connected to the driving axle housing, a wheel hub (27) rotatably disposed on the supporting shaft (26), a connecting hub (13) fixedly connected to the wheel hub (27), and a left end cover (11) fixedly mounted on the left end of the connecting hub (13) via a connecting bolt A (12); The small-tooth differential reduction assembly comprises a left eccentric sleeve (5) and a right eccentric sleeve (31) mounted on a drive axle input shaft (30) via a spline sleeve, a left gear (2) and a right gear (17) respectively rotatably arranged on the left eccentric sleeve (5) and the right eccentric sleeve (31) via a left support bearing A (3) and a right support bearing A (15), and an inner gear ring (14) arranged on the inner ring of a connecting hub (13) and meshing with the left gear (2) and the right gear (17); the left eccentric sleeve (5) The left gear (2) and the right eccentric sleeve (31) are eccentric cams with the same structure and size, and the installation phases of the two are 180 degrees apart; the left gear (2) and the right gear (17) have the same structure and size, and the number of teeth and the modulus are equal. A plurality of groups of tooth holes are evenly distributed on the left gear (2) and the right gear (17), and shaft pins (1) are embedded in the tooth holes; the left and right ends of the shaft pin (1) are supported and connected to the left end cover (11) and the support shaft (26) through the left support frame (10) and the right support frame (18) respectively; The wet brake assembly comprises a friction plate group which is respectively connected to the support shaft (26) and the input shaft (30) and produces a braking effect on the input shaft (30).

2. The small-tooth difference wheel reducer according to claim 1, characterized in that: The left end cover (11) is provided with a top pin (7), which cooperates with an adjustment support (8) arranged at the end of the input shaft (30) to form a stable limit support.

3. The small-tooth difference wheel reducer according to claim 1, characterized in that: The left end cover (11) is rotatably mounted on the left support frame (10) via a left support bearing B (9); the right support frame (18) is fixedly mounted on the support shaft (26) via a connecting bolt B (23).

4. The small-tooth difference wheel reducer according to claim 1, characterized in that: The left eccentric sleeve (5) and the right eccentric sleeve (31) are separated by a sleeve (4) sleeved on the input shaft (30).

5. The small-tooth difference wheel reducer according to claim 1, characterized in that: The left gear (2) and the right gear (17) are evenly provided with six groups of tooth holes.

6. The small-tooth difference wheel reducer according to claim 1, characterized in that: The number of teeth of the left gear (2) and the right gear (17) is 1 to 2 teeth less than the number of teeth of the inner gear ring (14).

7. The small-tooth difference wheel reducer according to claim 1, characterized in that: The shaft pin (1) is sleeved with a shaft pin sleeve (33).

8. The small-tooth difference wheel reducer according to claim 1, characterized in that: The friction plate group comprises an active friction plate (21) connected to a support shaft (26) via a friction plate holder (20), and a driven friction plate (22) connected to an input shaft (30) via a shaft sleeve (32); a piston (25) is movably arranged between the support shaft (26) and the friction plate group; the active friction plate (21) and the driven friction plate (22) are pushed and fitted together by the piston (25), thereby playing a braking role on the input shaft (30).

9. The small-tooth difference wheel reducer according to claim 8, characterized in that: The support shaft (26) is provided with an oil inlet (29) which is communicated with the oil passage inside the support shaft (26) to provide braking force to the piston (25).

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