Novel gear and inner hub connecting structure

Abstract

The utility model discloses a novel gear and inner hub connecting structure, which belongs to the technical field of transmissions, and comprises a gear and a transmission inner hub connected with a gear spline, the gear is provided with a gear spline, the gear spline is provided with a first snap ring groove, and a snap ring is preset in the first snap ring groove. The connecting structure can ensure the reliability of connection, and solves the problems that the axial space of the inner hub is small, and a traditional connecting scheme cannot meet the requirement.

Description

TECHNICAL FIELD

[0001] The utility model relates to a transmission technical field, concretely relates to a novel gear and inner hub connecting structure. BACKGROUND

[0002] The transmission gear and inner hub connecting structure is very crucial in the operation of the transmission. The traditional connecting mode includes spline connection, which can ensure the better coaxiality between the gear and the inner hub and can transmit larger torque. In order to adapt to the high performance requirement of the modern transmission, some new connecting structures are constantly emerging, such as the connecting structure through the friction plate type, which can realize the combination and separation of power faster in the shifting process, reduce the impact and improve the shifting quality. Compared with the general transmission, the gear and the inner hub are commonly connected, and the gear and the inner hub are often connected by spline connection, and the spline connection is provided with a snap ring for axial fixation of the inner hub. For compact structure and small radial size of the inner hub, the common scheme is often difficult to meet the connection requirement.

[0003] The application number KR1020160143526 discloses a torque converter hub and oil pump gear of an automatic transmission for realizing the connection structure of the torque converter hub and the oil pump gear of the automatic transmission of the automobile. The structure has a torque converter hub, and the outer periphery of the torque converter hub is formed into a cylindrical structure. The guide part of the oil pump gear has a thread, and the guide part of the oil pump gear rotates in the thread. The torque converter hub is inserted into the inner side of the oil pump gear. The guide part of the torque converter hub is fixed in the scissors inserted into the oil pump gear. The fixed groove is formed on the guide part of the torque converter hub at a specified depth. The patent technology still has room for improvement.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of clearly and completely describing the technical scheme of the present application and facilitating the understanding of those skilled in the art. The above technical scheme cannot be considered as known to those skilled in the art only because it is described in the background section of the present application. CONTENT OF THE UTILITY MODEL

[0005] In view of the problems existing in the prior art, the utility model provides a novel gear and inner hub connecting structure, which can ensure the reliability of the connection and solve the problems of small axial space of the inner hub and the inability of the traditional connecting scheme to meet the requirements.

[0006] To solve the above technical problems, the utility model provides the following technical scheme:

[0007] A novel gear and inner hub connecting structure, comprising: a gear and a transmission inner hub connected with the gear spline, the gear is provided with a gear spline, a first snap ring groove is formed on the gear spline, and a snap ring is preinstalled in the first snap ring groove.

[0008] According to an embodiment of the utility model, the snap ring is movably arranged in the first snap ring groove, and a distance is arranged between the bottom end of the snap ring and the bottom end of the first snap ring groove, the inner hub is provided with inner splines matched with the gear splines for installation, the inner splines are provided with a second snap ring groove, the front end of the inner splines is provided with a guide chamfer, the inner splines are sleeved on the outer side of the gear splines, the diameter of the snap ring is greater than the depth of the first snap ring groove, and the length of the snap ring protruding from the first snap ring groove is less than the radius of the snap ring.

[0009] The first snap ring groove is arranged at the gear splines on the gear for connecting with the inner hub, and a snap ring is pre-installed in the first snap ring groove, the snap ring is clamped in the first snap ring groove, the snap ring has a certain degree of deformation space, and a distance is arranged between the bottom end of the snap ring and the bottom end of the first snap ring groove to ensure that the snap ring has a space for compression inward, thereby ensuring the smooth installation of the inner hub. The diameter of the snap ring is greater than the depth of the first snap ring groove, so that after the inner hub and the gear are installed, a part of the snap ring can rebound into the second snap ring groove, and the length of the snap ring protruding from the first snap ring groove is less than the radius of the snap ring, so that the length of the protruding part of the snap ring is appropriate, thereby avoiding the difficulty in installation of the inner hub and the gear or the excessive friction between the snap ring and the two components after installation, which affects the transmission efficiency. The depth of the second snap ring groove is greater than the radius of the snap ring, so that the second snap ring groove has sufficient space to accommodate the rebound of the snap ring, and the outer end of the snap ring is prevented from contacting the bottom end of the second snap ring groove to cause noise or affect the transmission efficiency.

[0010] The inner hub and the gear are connected by the inner splines, and the second snap ring groove is arranged at the corresponding axial position of the inner splines for positioning the snap ring. The snap ring is pre-installed in the first snap ring groove on the gear splines, the front end of the inner hub is provided with a guide chamfer, and the inner hub is installed in the direction of the gear during installation. The snap ring on the shaft is first compressed axially, so that the snap ring is compressed inward along the guide chamfer at the front end of the inner hub, and the inner hub is installed in place. When the inner hub is installed in place, the snap ring rebounds and is clamped at the snap ring groove of the gear splines and the inner splines, thereby ensuring that the inner hub and the gear do not disengage. After installation, the snap ring does not come out, thereby improving the reliability of the connection between the gear and the inner hub, and meeting the functional requirements. At the same time, the problem that the traditional connection scheme cannot meet the requirements due to the small radial space of the inner hub is solved.

[0011] Meanwhile, the snap ring is used as the connecting medium of the gear and the inner hub, and the conventional connection mode using threads or complex splines is abandoned, thereby simplifying the internal structure of the transmission, improving the integrity and installation efficiency of the connection part, making the installation simpler and more convenient, reducing the weight of the conventional spline connection part, and improving the transmission efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be obtained from the provided drawings without creative labor.

[0013] Fig. 1 It is a schematic diagram of the gear and inner hub connection scheme of the present application.

[0014] Fig. 2 It is a schematic diagram of the snap ring position of the present application.

[0015] Fig. 3 It is a schematic diagram of the gear and inner hub connection state of the present application.

[0016] Reference signs: 10-gear; 101-gear spline; 102-first snap ring groove; 20-inner hub; 201-inner spline; 202-second snap ring groove; 30-snap ring. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0018] The concepts involved in the present application will be described below in combination with the drawings. It is pointed out here that the following descriptions of the concepts are only to make the content of the present application easier to understand, and do not represent the limitation of the protection scope of the present application; meanwhile, the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0019] Embodiment 1:

[0020] Referring to the drawings, Figs. 1-3 As shown in the drawings, a novel gear and inner hub connection structure comprises: a gear 10 and a transmission inner hub 20 connected with the gear spline of the gear 10, the gear 10 is provided with a gear spline 101, the gear spline 101 is provided with a first snap ring groove 102, and the first snap ring groove 102 is pre-provided with a snap ring 30.

[0021] The snap ring 30 is movably arranged in the first snap ring groove 102, the bottom end of the snap ring 30 is spaced apart from the bottom end of the first snap ring groove 102, the inner hub 20 is provided with an inner spline 201 matched and installed with the gear spline 101, the inner spline 201 is provided with a second snap ring groove 202, the front end of the inner spline 201 is provided with a guide chamfer, the inner spline 201 is sleeved outside the gear spline 101, the diameter distance of the snap ring 30 is greater than the depth distance of the first snap ring groove 102, and the length of the snap ring 30 protruding from the first snap ring groove 102 is less than the radius length of the snap ring 30. The second snap ring groove 202 is located in the middle of the inner spline 201, the first snap ring groove 102 is located in the middle of the gear spline 101, and the depth of the second snap ring groove 202 is greater than the radius length of the snap ring 30.

[0022] A first snap ring groove 102 is arranged on the gear 10 at the gear spline 101 for connecting with the inner hub 20, a snap ring 30 is pre-installed in the first snap ring groove 102, the snap ring 30 is clamped in the first snap ring groove 102, the snap ring 30 has a certain degree of deformation space, and the bottom end of the snap ring 30 is spaced apart from the bottom end of the first snap ring groove 102 to ensure that the snap ring 30 has a space for compression inward, so as to ensure the smooth installation of the inner hub 20. The diameter of the snap ring 30 is greater than the depth of the first snap ring groove 102, so that after the inner hub 20 and the gear 10 are installed, a part of the snap ring 30 can rebound into the second snap ring groove 202, and the length of the snap ring 30 protruding from the first snap ring groove 102 is less than the radius length of the snap ring 30, so that the length of the protruding part of the snap ring 30 is appropriate, avoiding causing difficulty in installation of the inner hub 20 and the gear 10, or excessive friction between the snap ring and the two components after installation affecting the transmission efficiency. The depth of the second snap ring groove 202 is greater than the radius length of the snap ring 30, so that the second snap ring groove 202 has sufficient space to accommodate the rebound of the snap ring 30, and also avoids the outer end of the snap ring 30 contacting the bottom end of the second snap ring groove 202 to cause noise or affect the transmission efficiency.

[0023] The inner spline 201 corresponding to the axial position of the inner hub 20 connected with the gear 10 is provided with a second snap ring groove 202 for positioning the snap ring 30. The snap ring 30 is pre-installed in the first snap ring groove 102 on the gear spline 101, the front end of the inner hub 20 is provided with a guide chamfer, and the inner hub 20 is installed in the direction of the gear 10. During installation, the snap ring 30 on the shaft is first compressed axially, so that the snap ring 30 is compressed inward along the guide chamfer at the front end of the inner hub 20 to the inside of the first snap ring groove 102, so that the inner hub 20 is installed in place. When the inner hub 20 is installed in place, the snap ring 30 rebounds and is clamped at the snap ring groove of the gear spline 101 and the inner spline 201, so as to ensure that the inner hub 20 and the gear 10 are not separated. After installation, the snap ring 30 does not come out, improving the reliability of the connection between the gear and the inner hub, and meeting the functional requirements. At the same time, the problem that the traditional connection scheme cannot meet the requirements due to the small radial space of the inner hub is solved.

[0024] Meanwhile, the snap ring 30 is used as the connecting medium of the gear 10 and the inner hub 20, the connecting mode of the conventional thread or the complex spline is abandoned, the internal structure of the transmission is simplified, the integrity and the installation efficiency of the connecting part are improved, the installation is more simple and convenient, the self-weight of the conventional spline connecting part is reduced, and the transmission efficiency is higher.

[0025] The above-mentioned embodiments and / or implementations are only used to illustrate the preferred embodiments and / or implementations of the present application, and do not limit the embodiments of the present application in any form, and any person skilled in the art can make some changes or modifications or other equivalent embodiments without departing from the technical means disclosed in the content of the present application, but should be considered as the same technology or embodiment as the present application.

[0026] The principles and implementations of the present application are described by applying specific examples herein, and the above-mentioned embodiment is only used to help understand the method and the core idea of the present application. The above-mentioned is only the preferred embodiment of the present application, and it should be pointed out that due to the limited expression, there are infinite specific structures, and for the person skilled in the art, some improvements, decorations or changes can be made without departing from the principles of the present application, and the above-mentioned technical features can be combined in a proper way; the improvements, decorations, changes or combinations, or the direct application of the present application to other occasions without improvement, should be considered as the protection scope of the present application.

Claims

1. A new gear and inner hub connection structure, comprising: Gear (10) and transmission inner hub (20) are spline connected with the gear (10), Characterized in that: the gear (10) is provided with gear spline (101), the first snap ring groove (102) is opened in the gear spline (101), the snap ring (30) is preinstalled in the first snap ring groove (102), the snap ring (30) protrudes from the first snap ring groove (102).

2. The novel gear and inner hub connection structure according to claim 1, characterized in that: The snap ring (30) is movably arranged in the first snap ring groove (102), and the bottom end of the snap ring (30) is spaced apart from the bottom end of the first snap ring groove (102).

3. The novel gear and inner hub connection structure according to claim 1, characterized in that: The inner hub (20) is provided with inner spline (201) matched with the gear spline (101), and the second snap ring groove (202) is opened in the inner spline (201).

4. The novel gear and inner hub connection structure according to claim 3, characterized in that: The front end of the inner spline (201) is provided with a guide chamfer.

5. The novel gear and inner hub connection structure according to claim 3, characterized in that: The inner spline (201) is arranged outside the gear spline (101).

6. The novel gear and inner hub connection structure according to claim 3, characterized in that: The second snap ring groove (202) is located in the middle of the inner spline (201).

7. The novel gear and inner hub connection structure according to claim 3, characterized in that: The depth of the second snap ring groove (202) is greater than the radius length of the snap ring (30).

8. The new gear and inner hub connection structure according to claim 1, characterized in that: The diameter distance of the snap ring (30) is greater than the depth distance of the first snap ring groove (102), and the length of the snap ring (30) protruding from the first snap ring groove (102) is less than the radius length of the snap ring (30).

9. The new gear and inner hub connection structure according to claim 1, characterized in that: The first snap ring groove (102) is located in the middle of the gear spline (101).

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