Gear transmission module, drive axle assembly and vehicle

Abstract

The utility model relates to the technical field of vehicles, and discloses a gear transmission module, a drive axle assembly and a vehicle. The gear transmission module comprises a gear transmission box and a wet type parking brake, the gear transmission box comprises an input shaft and an output shaft, and the torque ratio between the input shaft and the output shaft is smaller than 1; and the wet parking brake is in transmission connection with the input shaft. Compared with the mode that the output shaft is directly braked by a brake in the prior art, due to the fact that the torque ratio between the input shaft and the output shaft is smaller than 1, the wet-type parking brake can brake the input shaft only with smaller braking torque, and due to the fact that the needed braking torque is smaller, the braking efficiency is greatly improved. The required specification, size and number of internal structural parts of the wet type parking brake can also be reduced, and the gear transmission module, the drive axle assembly and the vehicle can reduce the overall weight and size of the wet type parking brake.

Description

Technical Field

[0001] The present application belongs to the field of vehicle technology, and specifically relates to a gear transmission module, a drive axle assembly and a vehicle. Background Art

[0002] The drive axle is an important mechanism located at the end of the transmission system, which changes the speed and torque transmitted by the transmission and distributes the changed speed and torque to the drive wheels. Figure 1 As shown, a drive axle generally consists of axle shafts 10, a brake, and an axle housing 20. The brake applies braking action to the axle shafts 10, while a speed reducer is typically installed within the axle housing 20 to reduce speed and increase torque, thereby providing greater output torque. To ensure sufficient braking force, the brake's braking torque typically needs to be increased. This, of course, requires increasing the size and number of the brake's internal components, which in turn increases the overall size of the brake and occupies a larger installation space. Utility Model Content

[0003] The purpose of this application is to provide a gear transmission module, a drive axle assembly and a vehicle to solve the problem that the overall size of the brake is large and occupies a large installation space.

[0004] To achieve the above objectives, the present application provides a gear transmission module, comprising:

[0005] a gear transmission box comprising an input shaft and an output shaft, wherein the torque ratio between the input shaft and the output shaft is less than 1; and

[0006] A wet parking brake is drivingly connected to the input shaft.

[0007] In some embodiments, the gear transmission module includes a case, the gear transmission case and the wet parking brake are integrated into the case, and the input shaft passes through the wet parking brake; or

[0008] The gear transmission box includes a first housing, the wet parking brake includes a second housing, the second housing is mounted on the first housing, and the input shaft passes through the wet parking brake.

[0009] In some embodiments, a wet parking brake includes a brake assembly and an actuation assembly;

[0010] The brake assembly includes a brake member and a friction member arranged at intervals along the axial direction of the input shaft, the friction member is engaged with the input shaft to prevent rotation, and the brake member is slidably clamped on the chassis or the second housing along the axial direction;

[0011] The drive assembly is arranged on a side of the brake assembly away from the gear transmission box, or the drive assembly is arranged on a side of the brake assembly close to the gear transmission box;

[0012] wherein, in the braking state, the driving assembly drives the brake member to be attached to the friction member;

[0013] in the unbraking state, the driving assembly drives the brake member to be separated from the friction member.

[0014] In some embodiments, the driving assembly comprises an elastic member and a brake execution member, the brake execution member is arranged between the elastic member and the brake assembly, the brake execution member is in abutment with the elastic member and the brake assembly respectively through the movable member, and the brake execution member is used to drive the movable member to move along the axial direction of the input shaft.

[0015] In some embodiments, the elastic member is a disc spring group formed by a plurality of brake disc springs.

[0016] In some embodiments, the brake execution member is a brake cylinder, the movable member is a brake piston of the brake cylinder, and the brake cylinder is further provided with an oil inlet and a gas outlet.

[0017] In some embodiments, the brake assembly comprises a plurality of friction members arranged in the axial direction and a plurality of brake members arranged in the axial direction.

[0018] wherein, the brake members and the friction members are alternately arranged in the axial direction.

[0019] In some embodiments, the wet-type parking brake is in transmission connection with the input shaft through a transmission shaft.

[0020] The second aspect of the present application protects a drive axle assembly, which comprises the above-mentioned gear transmission module.

[0021] The third aspect of the present application protects a vehicle, which comprises the above-mentioned gear transmission module or the above-mentioned drive axle assembly.

[0022] Through the above technical solution, the gear transmission module provided by the embodiments of the present application has the following beneficial effects:

[0023] In the technical solution of the present application, the wet-type parking brake can brake the input shaft, and the torque ratio between the input shaft and the output shaft is less than 1. Compared with the way of braking the output shaft (i.e. the half shaft member) directly by the brake in the prior art, the wet-type parking brake of the present application only needs a smaller braking torque to brake the input shaft. Since the required braking torque is smaller, the required specifications and quantities of the internal structural members of the wet-type parking brake can also be reduced, thereby reducing the overall weight and size of the wet-type parking brake, so that the overall structure of the gear transmission module is more compact, and the installation space is saved.

[0024] Other features and advantages of the embodiments of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without inventive work. In the drawings:

[0026] Figure 1 It is a structural diagram of a drive axle in the prior art;

[0027] Figure 2 Schematic diagram of the structure of the gear transmission module according to the first embodiment of the present application;

[0028] Figure 3 for Figure 2 A partial enlarged view of the wet parking brake and input shaft in the gear transmission module;

[0029] Figure 4 It is a partial enlarged view of the cooperation between the wet parking brake and the transmission shaft in the second embodiment of the present application.

[0030] Description of prior art reference numerals

[0031] 10 half shaft parts 20 bridge housing

[0032] Description of the reference numerals in this application

[0033] 1 Input shaft 7 Brake

[0034] 2 Output shaft 8 Friction member

[0035] 3 Drive assembly 9 Gear box

[0036] 3a Brake assembly S1 first housing

[0037] 4 Brake actuator S2 Second housing

[0038] 5 Elastic part B Wet parking brake

[0039] 6 Moving part L Axial direction

[0040] 1a Drive shaft DETAILED DESCRIPTION

[0041] The following describes the specific embodiments of the present application in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present application and are not intended to limit the present application.

[0042] The gear transmission module, drive axle assembly and vehicle according to the present application are described below with reference to the accompanying drawings.

[0043] Example 1

[0044] This application provides a gear transmission module, such as Figure 2 As shown, the gear transmission module includes a gear transmission box 9 and a wet parking brake B.

[0045] The gear transmission box 9 includes an input shaft 1 and an output shaft 2 , wherein the torque ratio between the input shaft 1 and the output shaft 2 is less than 1. The wet parking brake B is in driving connection with the input shaft 1 .

[0046] Specifically, the torque ratio between input shaft 1 and output shaft 2 is less than 1 (i.e., the torque of input shaft 1 is lower than that of output shaft 2). The wet parking brake B directly brakes input shaft 1, resulting in the wet parking brake B of this embodiment requiring only a relatively small braking torque. Compared to the prior art method of directly braking the axle member 10 (i.e., output shaft 2), the lower braking torque required by the wet parking brake B reduces the required dimensions and number of internal components of the wet parking brake B. This, in turn, reduces the overall weight and size of the wet parking brake B, making the gear transmission module more compact and saving installation space.

[0047] In this embodiment, if Figure 2 As shown, the gear transmission box 9 includes a first housing S1 , the wet parking brake B includes a second housing S2 , the second housing S2 is mounted on the first housing S1 , and the input shaft 1 passes through the wet parking brake B and is arranged.

[0048] In some embodiments, the second housing S2 is detachably connected to the first housing S1 or is welded to the second housing S1, wherein the detachable connection method includes clamping, riveting, or bolting.

[0049] Such an arrangement allows the gear transmission box 9 and the wet parking brake B to be installed separately, thereby facilitating the installation, removal and maintenance of the wet parking brake B.

[0050] In some embodiments, the gear transmission module includes a chassis, the gear transmission case 9 and the wet parking brake B are integrated into the chassis, and the input shaft 1 passes through the wet parking brake B.

[0051] Such an arrangement enables the gear transmission box 9 and the wet parking brake B to be integrated into one body, which improves the integrity and reduces the mold opening cost by sharing the chassis.

[0052] In this embodiment, if Figure 2 and Figure 3 As shown, the wet parking brake B includes a brake assembly 3 a and a drive assembly 3 .

[0053] The brake assembly 3a includes a brake member 7 and a friction member 8 arranged at intervals along the axial direction L of the input shaft 1. The friction member 8 is engaged with the input shaft 1 to prevent rotation. The brake member 7 is slidably clamped on the second housing S2 along the axial direction L.

[0054] The driving assembly 3 is arranged on a side of the brake assembly 3 a away from the gear transmission box 9 , which makes it easier to maintain the driving assembly 3 .

[0055] It can be understood that, in the braking state, the driving assembly 3 drives the braking member 7 to fit with the friction member 8 ; and when the braking is released, the driving assembly 3 drives the braking member 7 to separate from the friction member 8 .

[0056] Specifically, a "locked fit" refers to the restriction of relative rotation between the friction member 8 and the input shaft 1, thereby preventing the friction member 8 from pivoting with the input shaft 1. This is achieved, for example, by a key or spline. The brake member 7 is circumferentially fixed relative to the input shaft 1 and slidably engaged in the axial direction L within a housing slot of the second housing S2. This means that the brake member 7 cannot rotate circumferentially but can move axially along the input shaft 1. Thus, when braking, the drive assembly 3 drives the brake member 7 toward the gearbox 9, causing the brake member 7 to engage the friction member 8, forming surface contact and applying friction. To release the brake, the drive assembly 3 drives the brake member 7 away from the gearbox 9, separating the brake member 7 from the friction member 8 and releasing the braking restriction on the friction member 8, thereby releasing the wet parking brake B from the input shaft 1. The "locked fit" between the friction member 8 and the input shaft 1 can be achieved in a variety of ways, such as by splined connection between the friction member 8 and the input shaft 1, or by sleeved around the input shaft 1 and connected via a retaining pin.

[0057] In other embodiments, the drive assembly 3 is arranged on a side of the brake assembly 3a close to the gear transmission case 9. This facilitates maintenance of the friction member 8 and the brake member 7 in the brake assembly 3a. When braking, the drive assembly 3 drives the brake member 7 away from the gear transmission case 9. When the brake is released, the drive assembly 3 drives the brake member 7 toward the gear transmission case 9.

[0058] Those skilled in the art will appreciate that, in some embodiments, the brake member 7 may also be slidably disposed in the chassis slot of the chassis along the axial direction L.

[0059] Furthermore, the driving assembly 3 includes an elastic member 5 and a brake actuator 4. The brake actuator 4 is arranged between the elastic member 5 and the brake assembly 3a. The brake actuator 4 is respectively abutted against the elastic member 5 and the brake assembly 3a through a movable member 6. The brake actuator 4 is used to drive the movable member 6 to move axially along the input shaft 1.

[0060] Specifically, if Figure 2As shown, the elastic member 5 is in a compressed state. When the actuating force of the brake actuator 4 is less than the elastic force of the elastic member 5, the elastic member 5 pushes the brake member 7 via the movable member 6, causing the brake member 7 to engage with the friction member 8. When the actuating force of the brake actuator 4 is greater than the elastic force of the elastic member 5, the brake actuator 4 overcomes the elastic force and drives the brake member 7 through the movable member 6 to separate from the friction member 8. This arrangement facilitates the engagement of the brake member 7 with the friction member 8, thereby ensuring the braking effect of the wet parking brake B. The brake actuator 4 can be driven electrically or hydraulically.

[0061] In this embodiment, if Figure 2 As shown, the elastic member 5 is a disc spring group formed by combining a number of brake disc springs.

[0062] Specifically, multiple brake disc springs are stacked along the axial direction L to form a disc spring group, wherein the number of brake disc springs can be 1, and the number and stacking method of the brake disc springs can also be flexibly set according to the braking force requirements of the wet parking brake B.

[0063] Of course, those skilled in the art will appreciate that the form of the elastic member 5 is not limited to the disc spring assembly described above, and may also be an ordinary spring.

[0064] In this embodiment, if Figure 2 As shown, the brake actuator 4 is a brake oil cylinder, the movable part 6 is a brake piston of the brake oil cylinder, and the brake oil cylinder is also provided with an oil inlet and an air release port.

[0065] Specifically, the brake cylinder features high power density and excellent impact resistance, which enhances the braking effectiveness of the wet parking brake B. A hydraulic pump supplies oil to the brake cylinder via the parking brake oil pipe through the oil inlet to drive the brake piston. The bleed port exhausts air from the brake cylinder, preventing abnormal conditions such as vibration, shuddering, creeping, and noise during operation. Furthermore, since the wet parking brake B only brakes the input shaft 1, compared to the prior art method that requires separate hydraulic brakes for each half-shaft 10 on both sides, this application reduces the number of parking brake oil pipes required, reducing costs and facilitating maintenance.

[0066] In this embodiment, if Figure 2 As shown, the brake assembly 3a includes a plurality of friction members 8 spaced apart along the axial direction L and a plurality of brake members 7 spaced apart along the axial direction L. The brake members 7 and the friction members 8 are alternately spaced apart along the axial direction L. When braking or releasing the brake, all brake members 7 move synchronously.

[0067] With this arrangement, multiple friction pairs can be formed between the brake member 7 and the friction member 8 according to the braking force required to enhance the braking effect of the wet parking brake B. The brake pads can be made of metal, ceramic, asbestos, and other materials.

[0068] Of course, the number of friction pairs formed by the brake member 7 and the friction member 8 is not limited to the two groups shown in the figure, and may also be other numbers.

[0069] Example 2

[0070] The present application provides a gear transmission module. This embodiment is an improvement based on the technology of the above-mentioned embodiment 1. Compared with the above-mentioned embodiment 1, the main differences are:

[0071] like Figure 4 As shown, the wet parking brake B is connected to the input shaft 1 (as shown in FIG. Figure 2 As shown in FIG, the transmission shaft 1a is connected to the wet parking brake B. The transmission shaft 1a can transmit torque to a gear transmission box 9 such as a transmission box or a transfer box.

[0072] Specifically, the wet parking brake B is installed on the drive shaft 1a, which transmits torque to the input shaft 1. This allows for greater flexibility in the placement of the wet parking brake B. Furthermore, compared to the prior art method of directly applying the brake to the axle shaft 10, the wet parking brake B is installed on the drive shaft 1a. Maintenance of the wet parking brake B requires only the drive shaft 1a to be removed, without removing the axle shaft 10 or the axle housing 20, thus improving maintenance convenience. The assembly relationship between the wet parking brake B and the drive shaft 1a is similar to the assembly relationship between the wet parking brake B and the input shaft 1 described in the previous embodiment. The installation method of the wet parking brake B is similar to that described in the previous embodiment and will not be further described here.

[0073] Example 3

[0074] The present application provides a drive axle assembly. In a specific implementation, the drive axle assembly includes the gear transmission module provided in the above-mentioned embodiment 1 or embodiment 2.

[0075] like Figure 2 As shown, in this embodiment, a differential is provided in the gear transmission box 9 , and the gear transmission box 9 has two output shafts 2 , which are the left and right half shafts of the drive axle assembly respectively.

[0076] Since this embodiment adopts the gear transmission module provided in the first or second embodiment, the drive axle assembly also has all the technical effects of the gear transmission module, which will not be described in detail here.

[0077] The present application also protects a vehicle. In a specific embodiment, the vehicle includes the above-mentioned gear transmission module or the above-mentioned drive axle assembly.

[0078] Specifically, the power is transmitted to the wheel hub or wheel side reduction mechanism of the vehicle after being output from the output shaft 2 in the gear transmission module. The vehicle also has all the technical effects of the gear transmission module or the drive axle assembly described above, and thus will not be described here.

[0079] In the description of the present application, it should be understood that the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0080] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0081] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

Claims

1. A gear transmission module, characterized in that: include: A gear transmission box (9) comprises an input shaft (1) and an output shaft (2), wherein a torque ratio between the input shaft (1) and the output shaft (2) is less than 1; and A wet parking brake (B) is drivingly connected to the input shaft (1).

2. The gear transmission module according to claim 1, characterized in that: The gear transmission module comprises a chassis, the gear transmission case (9) and the wet parking brake (B) are integrated in the chassis, and the input shaft (1) is arranged to pass through the wet parking brake (B); or The gear transmission box (9) includes a first housing (S1), the wet parking brake (B) includes a second housing (S2), the second housing (S2) is mounted on the first housing (S1), and the input shaft (1) is arranged through the wet parking brake (B).

3. The gear transmission module according to claim 2, characterized in that: The wet parking brake (B) comprises a brake assembly (3a) and a drive assembly (3); The brake assembly (3a) comprises a brake member (7) and a friction member (8) arranged at intervals along the axial direction (L) of the input shaft (1); the friction member (8) is engaged with the input shaft (1) to prevent rotation; and the brake member (7) is slidably mounted on the chassis or the second housing (S2) along the axial direction (L); The drive assembly (3) is arranged on a side of the brake assembly (3a) away from the gear transmission box (9), or the drive assembly (3) is arranged on a side of the brake assembly (3a) close to the gear transmission box (9); Wherein, in the braking state, the driving component (3) drives the braking component (7) to fit the friction component (8); when the braking is released, the driving component (3) drives the braking component (7) to separate from the friction component (8).

4. The gear transmission module according to claim 3, characterized in that: The driving assembly (3) includes an elastic member (5) and a brake actuator (4), wherein the brake actuator (4) is arranged between the elastic member (5) and the brake assembly (3a), and the brake actuator (4) is respectively in contact with the elastic member (5) and the brake assembly (3a) through a movable member (6), and the brake actuator (4) is used to drive the movable member (6) to move axially along the input shaft (1).

5. The gear transmission module according to claim 4, characterized in that: The elastic member (5) is a disc spring group formed by combining a plurality of brake disc springs.

6. The gear transmission module according to claim 4, characterized in that: The brake actuator (4) is a brake oil cylinder, the movable part (6) is a brake piston of the brake oil cylinder, and the brake oil cylinder is also provided with an oil inlet and an air release port.

7. The gear transmission module according to claim 3, characterized in that: The brake assembly (3a) comprises a plurality of friction members (8) arranged at intervals along the axial direction (L) and a plurality of brake members (7) arranged at intervals along the axial direction (L); Wherein, the braking member (7) and the friction member (8) are arranged alternately and spaced apart along the axial direction (L).

8. The gear transmission module according to claim 1, characterized in that: The wet parking brake (B) is connected to the input shaft (1) via a transmission shaft (1a), and the transmission shaft (1a) is arranged to pass through the wet parking brake (B).

9. A drive axle assembly, characterized in that: The drive axle assembly includes the gear transmission module according to any one of claims 1 to 8.

10. A vehicle, characterized in that: The vehicle includes the gear transmission module according to any one of claims 1 to 8 or the drive axle assembly according to claim 9.

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