Brake outer hub and brake assembly

Abstract

The present disclosure relates to the technical field of gearbox, and particularly relates to a brake outer hub and a brake assembly. The brake outer hub is installed on a gearbox shell and comprises: an outer hub body, the outer hub body comprising a first mounting part, a second mounting part and a connecting part; two groups of tooth grooves for engaging with steel sheets are respectively arranged on the first mounting part and the second mounting part, and the two groups of tooth grooves are used for mounting two groups of brakes; the connecting part is used for connecting the first mounting part and the second mounting part; and at least one of the first mounting part, the second mounting part and the connecting part is connected with the gearbox shell through a circumferential limiting structure. The brake outer hub is made into a double-sided structure, and two groups of brake structures are respectively mounted by using the first mounting part and the second mounting part, so that the two groups of brakes can form an assembly structure, the assembly action can be completed outside the gearbox, and finally the assembly can be integrally installed into the gearbox.

Description

Technical Field

[0001] This disclosure relates to the field of transmission technology, and more particularly to a brake hub and a brake assembly. Background Technology

[0002] A car transmission is a gearbox that coordinates the engine speed and the actual speed of the wheels to optimize engine performance. During vehicle operation, the transmission can create different gear ratios between the engine and wheels, enabling the transmission of different engine speeds.

[0003] There are two types of transmissions: manual and automatic. Manual transmissions are mainly composed of gears and shafts, and different gear combinations produce speed and torque changes. Automatic transmissions (AT) are composed of a torque converter, planetary gears, and a hydraulic control system, and achieve speed and torque changes through hydraulic transmission and gear combinations.

[0004] Automatic transmissions, with their advantages of improved driving comfort and reduced driver fatigue, have become a trend in modern vehicle configurations. They utilize planetary gear mechanisms for gear shifting, automatically changing gears based on accelerator pedal pressure and vehicle speed. Drivers only need to operate the accelerator pedal to control speed, allowing them to focus entirely on the road without the hassle of manual shifting.

[0005] The gearbox often requires the coordination of multiple sets of brakes and clutches to control gear positions. Since the outer hub of the brake is usually formed by machining grooves on the gearbox housing, installing the brake pads, friction pads, and inner hub is often troublesome and inefficient. Summary of the Invention

[0006] To solve the above-mentioned technical problems, this disclosure provides a brake outer hub and a brake assembly.

[0007] In a first aspect, this disclosure provides a brake outer hub, mounted on a gearbox housing, comprising: an outer hub body, the outer hub body including a first mounting portion, a second mounting portion and a connecting portion;

[0008] The first mounting part and the second mounting part are respectively provided with two sets of toothed grooves that mesh with the steel sheet, and the two sets of toothed grooves are used to install two sets of brakes.

[0009] The connecting part is used to connect the first mounting part and the second mounting part;

[0010] At least one of the first mounting portion, the second mounting portion, and the connecting portion is connected to the gearbox housing via a circumferential limiting structure.

[0011] Optionally, two clamping grooves are formed in the connecting portion, and the two clamping grooves are in sliding fit with the pistons of the two groups of brakes.

[0012] Optionally, the two clamping grooves are arranged in axial direction of the outer hub body.

[0013] Optionally, the first mounting portion or the second mounting portion is connected with the gearbox housing by a key.

[0014] Optionally, the first mounting portion has a smaller diameter than the second mounting portion, and the first mounting portion is connected with the gearbox housing by a spline;

[0015] or the first mounting portion has a larger diameter than the second mounting portion, and the second mounting portion is connected with the gearbox housing by a spline.

[0016] Optionally, one of the axial ends of the outer hub body is in interference fit with the gearbox housing, or both axial ends of the outer hub body are in interference fit with the gearbox housing.

[0017] Optionally, the bottom of the first mounting portion and the bottom of the second mounting portion are both provided with oil leakage holes.

[0018] In a second aspect, the disclosure provides a brake assembly, comprising the brake outer hub as described above, and further comprising two groups of steel sheets, two pistons, two groups of friction sheets, two inner hubs and two top sheets.

[0019] The two groups of steel sheets are correspondingly arranged in the tooth grooves of the first mounting portion and the tooth grooves of the second mounting portion.

[0020] The two groups of friction sheets are correspondingly arranged alternately with the two groups of steel sheets, and the two groups of friction sheets are correspondingly arranged on the two inner hubs.

[0021] The two top sheets are respectively arranged on the first mounting portion and the second mounting portion, the two pistons are correspondingly arranged in sliding fit on the two clamping grooves, and the two top sheets and the two pistons are arranged in one-to-one correspondence.

[0022] Optionally, the top sheet is provided with a protruding structure, and the protruding structure on the top sheet is arranged in direct correspondence with the piston.

[0023] Optionally, a clamping spring is further included, the clamping spring is arranged in a clamping spring groove of the gearbox housing, and the clamping spring abuts against an axial end surface of the brake outer hub.

[0024] Optionally, the circlip is provided with a slope structure on the axial end surface away from the brake outer hub, and the slope structure is used for guiding the circlip into the circlip groove of the gearbox housing.

[0025] The technical scheme provided by the embodiments of the present disclosure has the following advantages compared with the prior art:

[0026] The brake outer hub provided by the present disclosure can significantly reduce the assembly difficulty of the brake and significantly improve the installation efficiency by making the outer hub body into a double-sided structure, installing two groups of brake structures by using the first mounting part and the second mounting part respectively, forming an assembly structure of the two groups of brakes, completing the assembly action outside the gearbox, and finally integrally assembling the assembly into the gearbox. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present disclosure and, together with the specification, serve to explain the principles of the present disclosure.

[0028] In order to more clearly illustrate the technical scheme in the embodiments of the present disclosure or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0029] Figure 1 The structure diagram of the brake outer hub described in the embodiments of the present disclosure;

[0030] Figure 2 The sectional view of the brake outer hub described in the embodiments of the present disclosure;

[0031] Figure 3 The sectional view of the brake assembly described in the embodiments of the present disclosure;

[0032] Figure 4 The Figure 3 The local enlarged view at A in FIG.

[0033] In the drawings, 1 is an outer hub body; 11 is a first mounting part; 12 is a second mounting part; 13 is a connecting part; 131 is a clamping groove; 132 is an oil passage; 14 is an oil leakage hole; 15 is a spline; 21 is a steel sheet; 22 is a piston; 23 is a friction plate; 24 is an inner hub; 25 is a top sheet; 251 is a protruding structure; 26 is a circlip; 261 is a slope structure; and 3 is a gearbox housing. DETAILED DESCRIPTION

[0034] In order to enable the above-mentioned purposes, features and advantages of the present disclosure to be more clearly understood, the schemes of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0035] In the following description, many specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure can also be practiced without the specific details that are different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present disclosure, not all the embodiments.

[0036] The automobile gearbox is a set of gearboxes used to coordinate the speed of the engine and the actual driving speed of the wheels, to play the best performance of the engine. The gearbox can produce different gear ratios between the engine and the wheels during the driving of the automobile, to realize the transmission of different gear speeds.

[0037] The gearbox is divided into manual and automatic, the manual gearbox is mainly composed of gears and shafts, and different gear combinations are used to produce variable speed and torque; and the automatic gearbox AT is composed of a hydraulic torque converter, a planetary gear and a hydraulic control system, and the variable speed and torque are achieved by the way of hydraulic transmission and gear combination.

[0038] Among them, the automatic gearbox has the advantages of driving comfort and reducing driver fatigue, and has become a development direction of modern vehicle configuration. The automatic gearbox is a variable speed device using planetary gear mechanism, which can automatically change gear according to the degree of accelerator pedal and vehicle speed change, and the driver only needs to control the accelerator pedal to control the vehicle speed, so the driver can concentrate on watching the road traffic without being confused by gear shifting.

[0039] The gearbox often needs the cooperation of multiple sets of brakes and clutches to control the gear, and since the outer hub of the brake is generally formed by machining a tooth groove on the gearbox shell, it is often troublesome to install the steel sheet, friction plate and inner hub of the brake, and the installation efficiency is very low.

[0040] Based on this, the embodiment provides a brake outer hub and a brake assembly, by making the outer hub body into a double-sided structure, two sets of brake structures are installed respectively by using the first mounting part and the second mounting part, which not only can form an assembly structure of two sets of brakes, but also can complete the assembly action outside the gearbox, and finally the assembly can be integrated into the gearbox, which can significantly reduce the assembly difficulty of the brake and obviously improve the installation efficiency. The following will be described in detail through specific embodiments:

[0041] Reference Figures 1 to 4As shown, the brake outer hub provided by the embodiment is mounted on the gearbox shell 3, and comprises: an outer hub body 1, the outer hub body 1 comprising a first mounting portion 11, a second mounting portion 12 and a connecting portion 13; two sets of tooth grooves corresponding to the steel sheet 21 are formed on the first mounting portion 11 and the second mounting portion 12, and the two sets of tooth grooves are used for mounting two sets of brakes; the connecting portion 13 is used for connecting the first mounting portion 11 and the second mounting portion 12; and at least one of the first mounting portion 11, the second mounting portion 12 and the connecting portion 13 is connected with the gearbox shell 3 through a circumferential limiting structure.

[0042] In the embodiment, the outer hub body 1 is made into a double-sided structure, and the first mounting portion 11 and the second mounting portion 12 are used to mount two sets of brake structures, so that the two sets of brakes can form an assembly structure, the assembly action can be completed outside the gearbox, and finally the assembly can be integrally installed into the gearbox, thereby significantly reducing the assembly difficulty of the brake and obviously improving the installation efficiency.

[0043] In some embodiments, two clamping grooves 131 are formed on the connecting portion 13, the two clamping grooves 131 are respectively in sliding fit with the pistons 22 of the two sets of brakes, and an oil channel 132 in communication with the clamping grooves 131 is also formed on the connecting portion 13; it should be understood that a sealing structure is arranged at the connection between the piston 22 and the clamping groove 131, so as to prevent oil from leaking from the gap between the piston 22 and the clamping groove 131 when the piston 22 moves, thereby affecting the establishment of oil pressure.

[0044] It should be noted that after the brake is assembled, air tightness detection needs to be performed to ensure that stable oil pressure can be established during work; meanwhile, due to the existence of a tolerance range of each part of the brake, the tolerance accumulation after assembly causes the stroke of the piston 22 of each brake from release to compression to be different, in order to better realize precise control of the brake, the stroke of the piston 22 from release to compression needs to be measured after the gearbox is assembled. The detection of air tightness and the stroke of the piston 22 after the brake assembly is completely assembled outside the gearbox increases the difficulty and cost of the test equipment and assembly process design; the clamping groove 131 and the oil channel 132 are arranged, so that the detection of air tightness and the stroke of the piston 22 can be directly performed after the brake assembly is completely assembled outside the gearbox, thereby greatly reducing the detection difficulty and obviously improving the assembly efficiency of the entire gearbox.

[0045] Continuing to refer to Figure 2 and Figure 3 As shown, the two clamping grooves 131 are arranged in an axial direction of the outer hub body 1; such an arrangement can effectively shorten the axial length of the entire brake assembly and reduce the occupied space of the brake assembly.

[0046] In some embodiments, the first mounting portion 11 or the second mounting portion 12 is connected with the gearbox shell 3 through a key connection; wherein the key connection can be a flat key connection, or other key connections such as splines 15; it should be understood that the outer wall of the first mounting portion 11 or the second mounting portion 12 is provided with external splines, and the inner wall of the gearbox shell 3 is provided with internal splines, which are matched to realize the spline 15 connection; the gearbox shell 3 can limit the outer hub body 1 in the circumferential direction through the spline 15 to prevent the outer hub body 1 from rotating, and can also make it easier to install the outer hub body 1 to the gearbox shell 3 without generating axial resistance; it should be noted that some brakes inside the gearbox need to withstand excessively high torque, and the torque they withstand can exceed 2000Nm; since the thickness of the steel sheet 21 is small, the contact area between the steel sheet 21 of the brake and the gearbox shell 3 is small, and it is easy to crush the gearbox shell 3; therefore, the gearbox shell 3 needs to be heat treated, and the local heat treatment process is difficult, and the overall heat treatment cost is very high; in the present application, since the brake needs to transmit torque to the gearbox shell 3, the two are connected through the spline 15 of the outer hub body 1, which is more effective than the direct connection of the steel sheet 21 and the gearbox shell 3, and can effectively increase the contact area between the outer hub body 1 and the gearbox shell 3, thereby making the stress of the entire gearbox shell 3 more uniform, preventing the problem of excessive pressure on the upper part of the gearbox shell 3, and reducing the risk of deformation of the gearbox shell 3. Especially when the gearbox shell 3 is made of aluminum alloy, the strength is lower than that of iron, and this effect is more pronounced. At the same time, the size of the outer hub body 1 is small, which makes it easier to heat treat, thereby ensuring the strength of the outer hub body 1.

[0047] In further embodiments, the diameter of the first mounting portion 11 is smaller than that of the second mounting portion 12, and the first mounting portion 11 is connected with the gearbox shell 3 through the spline 15; since the diameter of the first mounting portion 11 is small, the thickness of the gearbox shell 3 at this position is thick, and this arrangement can ensure that the connection between the gearbox shell 3 and the first mounting portion 11 has sufficient strength; or the diameter of the first mounting portion 11 is larger than that of the second mounting portion 12, and the second mounting portion 12 is connected with the gearbox shell 3 through the spline 15; since the diameter of the second mounting portion 12 is small, the thickness of the gearbox shell 3 at this position is thick, and this arrangement can ensure that the connection between the gearbox shell 3 and the second mounting portion 12 has sufficient strength; continuing to refer to Figure 3 As shown in FIG. 11, the diameter of the mounting portion of the front section in the direction of inserting the brake assembly is smaller, that is, the diameter of the first mounting portion 11 is smaller than that of the second mounting portion 12; the first mounting portion 11 and the second mounting portion 12 form a stepped structure, and the small-diameter part is located in the front section, which is more convenient for the installation of the brake assembly.

[0048] In some embodiments, one axial end of the outer hub body 1 is interference fit with the gearbox housing 3, or both axial ends of the outer hub body 1 are interference fit with the gearbox housing 3; it should be understood that the middle position of the outer hub body 1 is clearance fit with the gearbox housing 3, and there is no resistance during the process of inserting the outer hub body 1 into the gearbox housing 3, only when it is immediately installed in place, the opposite positions of the two ends of the outer hub body 1 begin to be interference fit with the gearbox housing 3, so that the entire outer hub body 1 completes the centering action, and also ensures the stability of the brake outer hub in the gearbox housing 3.

[0049] With reference to the accompanying drawings Figures 1 to 3 As shown, the bottom of the first mounting portion 11 and the second mounting portion 12 is provided with an oil leakage hole 14; the oil leakage hole 14 is located at the bottom of the outer hub body 1, and the residual oil of mechanical lubrication and the high-pressure oil of the piston cavity can be discharged in time through the oil leakage hole 14 by gravity, so as to avoid affecting the working effect of the brake.

[0050] In a second aspect, the disclosure provides a brake assembly, which comprises the brake outer hub as above, and further comprises two groups of steel sheets 21, two pistons 22, two groups of friction sheets 23, two inner hubs 24 and two top sheets 25; the two groups of steel sheets 21 are correspondingly installed in the tooth grooves of the first mounting portion 11 and the tooth grooves of the second mounting portion 12; the two groups of friction sheets 23 are correspondingly arranged in an interleaved manner with the two groups of steel sheets 21, and the two groups of friction sheets 23 are correspondingly installed on the two inner hubs 24; the two top sheets 25 are respectively installed on the first mounting portion 11 and the second mounting portion 12, the two pistons 22 are correspondingly slidably arranged on the two clamping grooves 131; the two top sheets 25 and the two pistons 22 are arranged opposite to each other.

[0051] In some embodiments, the top sheet 25 is provided with a protruding structure 251, and the protruding structure 251 on the top sheet 25 is arranged opposite to the corresponding piston 22; such arrangement can ensure that the force point is at the middle position of the friction sheet 23, prevent the steel sheet 21 and the friction sheet 23 from being misaligned under force, form a force arm, and cause the steel sheet 21 and the friction sheet 23 to be damaged.

[0052] In some embodiments, a clamping spring 26 is further included, which is arranged in a clamping spring groove of the gearbox housing 3 and abuts against the axial end face of the brake outer hub; it should be understood that the clamping spring 26 is used for axially limiting the outer hub body 1 to prevent the outer hub body 1 from moving axially inside the gearbox.

[0053] With reference to the accompanying drawings Figure 3 and Figure 4As shown, the clamping spring 26 is provided with a bevel structure 261 on the axial end surface away from the brake outer hub, and the bevel structure 261 is used to guide the clamping spring 26 into the clamping spring groove of the gearbox shell 3; it should be noted that the bevel structure 261 is formed by cutting a part of the structure of the clamping spring 26, and the clamping spring 26 is gradually reduced in thickness in the radial direction on the axial end surface away from the brake outer hub to form the bevel structure 261, and when the clamping spring 26 is extruded outward in the radial direction, the bevel structure 261 can quickly guide the clamping spring 26 into the clamping spring groove, so as to ensure that the clamping spring 26 is installed in place, and the bevel structure 261 can also form a pre-tightening effect on the outer hub body 1.

[0054] The specific implementation and implementation principles are the same as those of the above-mentioned embodiments, and can bring the same or similar technical effects, which will not be repeated here, and the specific description can be referred to the description of the above-mentioned brake outer hub embodiment.

[0055] It should be noted that in this paper, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0056] The above is only a specific embodiment of the present disclosure, which enables those skilled in the art to understand or implement the present disclosure. Various modifications of these embodiments will be apparent 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 disclosure. Therefore, the present disclosure will not be limited to these embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A brake hub, mounted on a gearbox housing (3), characterized in that, include: The outer hub body (1) includes a first mounting part (11), a second mounting part (12), and a connecting part (13). The first mounting part (11) and the second mounting part (12) are respectively provided with two sets of tooth grooves that mesh with the steel sheet (21), and the two sets of tooth grooves are respectively used to install two sets of brakes; The connecting part (13) is used to connect the first mounting part (11) and the second mounting part (12). At least one of the first mounting part (11), the second mounting part (12) and the connecting part (13) is connected to the gearbox housing (3) by a circumferential limiting structure; The connecting part (13) has two slots (131), which are slidably engaged with the pistons (22) of the two sets of brakes respectively. The connecting part (13) also has an oil passage (132) communicating with the slots (131). The first mounting part (11) or the second mounting part (12) is connected to the gearbox housing (3) by a key.

2. The brake outer hub according to claim 1, characterized in that, The two slots (131) are offset in the axial direction of the outer hub body (1).

3. The brake outer hub according to claim 1, characterized in that, The diameter of the first mounting part (11) is smaller than that of the second mounting part (12), and the first mounting part (11) is connected to the gearbox housing (3) via a spline (15); Alternatively, the diameter of the first mounting part (11) may be larger than that of the second mounting part (12), and the second mounting part (12) may be connected to the gearbox housing (3) via a spline (15).

4. The brake outer hub according to claim 1, characterized in that, One axial end of the outer hub body (1) is press-fitted with the gearbox housing (3), or both ends of the outer hub body (1) along its axial direction are press-fitted with the gearbox housing (3).

5. The brake outer hub according to claim 1, characterized in that, Both the first mounting part (11) and the second mounting part (12) have oil leakage holes (14) at their bottoms.

6. A brake assembly, characterized in that, The brake includes the outer hub as described in any one of claims 1 to 5, and further includes two sets of steel plates (21), two pistons (22), two sets of friction plates (23), two inner hubs (24) and two top plates (25). The two sets of steel plates (21) are respectively installed in the toothed grooves of the first mounting part (11) and the toothed grooves of the second mounting part (12); The two sets of friction plates (23) are arranged in an alternating pattern with the two sets of steel plates (21), and the two sets of friction plates (23) are mounted on the two inner hubs (24). The two top plates (25) are respectively mounted on the first mounting part (11) and the second mounting part (12), and the two pistons (22) are correspondingly slidably arranged on the two slots (131); the two top plates (25) and the two pistons (22) are arranged opposite to each other.

7. The brake assembly according to claim 6, characterized in that, The top plate (25) is provided with a protruding structure (251), and the protruding structure (251) on the top plate (25) and the corresponding piston (22) are arranged opposite each other.

8. The brake assembly according to claim 7, characterized in that, It also includes a retaining ring (26), which is disposed in the retaining ring groove of the gearbox housing (3) and abuts against the axial end face of the brake outer hub.

9. The brake assembly according to claim 8, characterized in that, The retaining ring (26) has an inclined structure (261) on its axial end face away from the brake hub. The inclined structure (261) is used to guide the retaining ring (26) into the retaining ring groove of the gearbox housing (3).

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