Self-lubricating rolling-body-free bearing for gear shifting fork

Abstract

The self-lubricating rolling-body-free bearing comprises an outer rolling body, a core shaft, a clamping spring and a sealing ring, the outer rolling body is of a semi-closed cylindrical structure, one end of the outer rolling body is of a sealed structure, a plurality of axial oil grooves are formed in the inner diameter face of the outer rolling body in the axial direction, and the clamping spring is arranged in the outer rolling body. An outer rolling body snap spring groove is formed in the middle of the inner diameter face of the outer rolling body in the circumferential direction, a mandrel snap spring groove is formed in the position, corresponding to the outer rolling body snap spring groove, of the mandrel, and the mandrel is arranged in the outer rolling body in a sleeved mode and locked in the outer rolling body snap spring groove and the mandrel snap spring groove through snap springs. A sealing ring spigot is formed in the position, close to the opening end, of the inner diameter face of the outer rolling body, the core shaft is sleeved with the sealing ring, the sealing ring is arranged in the sealing ring spigot, a circumferential oil groove is formed in the position, close to the sealing end, of the inner diameter face of the outer rolling body, and a DLC coating is arranged on the surface of the core shaft. Impact resistance, wear resistance, good self-lubricating property and high precision are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of bearings, in particular to a self-lubricating bearing without rolling elements for a shift fork. Background Art

[0002] The shift fork is a mechanical component in the transmission. Its main function is to control the position of the gear so that the drive shaft can smoothly connect or disengage with the gear, thereby realizing the shifting operation. Its working principle is to connect with the shift lever and shift the gear from one gear to another through push-pull movement, thereby realizing the shifting function of the car. The shift fork bearing is applied to the shift fork claw end of the shift fork to transmit mechanical action. It works in conjunction with the slider and slide shaft, push rod, spring, etc. to enable the shift fork to smoothly transmit the driver's operating force to the gear to achieve shifting.

[0003] The shifting structure does not require high speed, but requires mechanical properties of impact resistance and wear resistance. Therefore, the bearing at the shift fork and shifter claw end also needs extremely high impact resistance and wear resistance. In addition, since the bearing at this position is difficult to maintain, the self-lubrication and life of the bearing are extremely high.

[0004] The outer rolling elements of existing shift fork bearings are mostly through-holes, which cannot store oil and have poor self-lubrication. They are mainly lubricated by gear oil that is thrown from the inside of the gearbox to the bearings. They also have poor impact resistance and wear resistance, low precision and high noise. Utility Model Content

[0005] How to improve the impact resistance and wear resistance of the existing shift fork bearings, and at the same time improve its self-lubricating property to increase its service life is a difficulty that needs to be solved. At the same time, improving its precision and reducing shift noise to improve the smoothness and comfort of shifting are also problems that need to be solved. Therefore, according to these problems, the utility model designs a self-lubricating non-rolling element bearing for a shift fork that is impact-resistant, wear-resistant, has good self-lubricating property and high precision.

[0006] The utility model is realized through the following technical scheme: a self-lubricating non-rolling element bearing for a shift fork, comprising an outer rolling element, a core shaft, a retaining spring and a sealing ring, wherein one end of the core shaft is provided with a rounded corner and the other end is provided with an oblique angle, and the core shaft is sleeved in the outer rolling element.

[0007] In order to optimize the structure and improve the self-lubricating property of the bearing, the outer rolling element is a semi-closed cylindrical structure with a sealing structure at one end, which cooperates with the sealing ring at the open end to store grease. A plurality of axial oil grooves are provided on the inner diameter surface of the outer rolling element along the axial direction, and a sealing ring stop is provided on the inner diameter surface of the outer rolling element near the open end. The sealing ring is sleeved on the core shaft and arranged in the sealing ring stop for dust prevention. At the same time, it forms a relatively closed space together with the above-mentioned sealing structure to store grease and improve the self-lubricating property.

[0008] In order to achieve a better self-lubricating effect, further, a circumferential oil groove is provided on the inner diameter surface of the outer rolling body near the sealing end.

[0009] In order to achieve the best oil storage and self-lubrication effects, preferably, the axial oil groove and the circumferential oil groove are arc-shaped, and there are three axial oil grooves that are evenly opened along the circumference of the outer rolling element. According to actual conditions, more or less or other shapes of axial oil grooves and circumferential oil grooves can be designed.

[0010] In order to optimize the structure to improve the impact resistance of the bearing, and at the same time improve the bearing accuracy to improve the smoothness and comfort of gear shifting and reduce noise, an outer rolling element retaining spring groove is circumferentially opened in the middle of the inner diameter surface of the outer rolling element, and a core shaft retaining spring groove is opened on the core shaft corresponding to the position of the outer rolling element retaining spring groove. The core shaft is locked in the outer rolling element retaining spring groove and the core shaft retaining spring groove through the retaining spring, thereby realizing self-locking of the outer rolling element and the core shaft, and improving the reliability of the internal connection of the bearing, the stability of operation and the impact resistance.

[0011] In order to improve the wear resistance, the surface of the mandrel has a DLC coating.

[0012] In order to improve the convenience of assembly, the sealing ring stop is provided with a first chamfer near the inner diameter surface of the outer rolling element, and the sealing ring stop is provided with a second chamfer near the opening end of the outer rolling element.

[0013] The beneficial effects of the utility model are as follows: the self-lubricating rolling element-free bearing for the shift fork is designed to be used with a semi-enclosed outer rolling element in conjunction with a sealing ring, thereby greatly improving the self-lubricating effect of the bearing, thereby extending the service life of the bearing; by optimizing the outer rolling element and the core shaft structure, the reliability of the internal connection of the bearing, the stability of operation and the impact resistance are greatly improved, and the bearing accuracy is improved, thereby improving the smoothness and comfort of the shifting and reducing noise; in addition, the self-lubricating rolling element-free bearing for the shift fork has strong wear resistance, a compact structure, and is easy to install and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of a self-lubricating non-rolling element bearing for a shift fork of the utility model;

[0015] Figure 2 It is a cross-sectional view of the self-lubricating non-rolling element bearing for the shift fork of the utility model;

[0016] Figure 3 It is a structural schematic diagram of the outer rolling element of the self-lubricating rolling element-free bearing for the shift fork of the utility model;

[0017] In the figure: 1. outer rolling element; 11. axial oil groove; 12. circumferential oil groove; 13. outer rolling element retaining ring groove; 14. sealing ring stop; 15. first chamfer; 16. second chamfer; 2. mandrel; 21. mandrel retaining ring groove; 22. fillet; 23. bevel; 3. retaining ring; 4. sealing ring. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0019] like Figure 1-3 The self-lubricating non-rolling element bearing for a shift fork shown in the figure comprises an outer rolling element 1, a core shaft 2, a retaining spring 3 and a sealing ring 4, wherein the surface of the core shaft has a DLC coating.

[0020] The outer rolling body 1 is a semi-closed cylindrical structure with one end being a sealed structure. Three axial oil grooves 11 are evenly arranged along the axial direction on the inner diameter surface of the outer rolling body 1, and a circumferential oil groove 12 is arranged near the sealed end. The axial oil grooves 11 and the circumferential oil grooves 12 are in arc shape.

[0021] An outer rolling body retaining ring groove 13 is provided in the middle of the inner diameter surface of the outer rolling body 1 along the circumferential direction, a fillet 22 is provided at one end of the mandrel 2, and an oblique angle 23 is provided at the other end, a mandrel retaining ring groove 21 is provided on the mandrel 2 corresponding to the position of the outer rolling body retaining ring groove 13, the mandrel 2 is sleeved in the outer rolling body 1 and locked in the outer rolling body retaining ring groove 13 and the mandrel retaining ring groove 21 by the retaining ring 3, a sealing ring stop 14 is provided on the inner diameter surface of the outer rolling body 1 near the open end, the sealing ring 4 is sleeved on the mandrel 2 and arranged in the sealing ring stop 14. The sealing ring stop 14 has a first chamfer 15 near the inner diameter surface of the outer rolling body 1, and a second chamfer 16 is provided on the sealing ring stop 14 near the open end of the outer rolling body 1.

[0022] The assembly process of the self-lubricating rolling element-free bearing for the shift fork is as follows: first install the retaining ring 3 in the retaining ring groove 21 of the core shaft, then inject a certain amount of lubricating grease into the outer rolling element 1, and then press the core shaft 2 and retaining ring 3 assembly into the outer rolling element 1, with the rounded corner 22 facing inward, until the retaining ring 3 is inserted into the retaining ring groove 13 of the outer rolling element, and finally press the sealing ring 4 into the sealing ring stop 14, rotate the core shaft 2 several times to evenly disperse the internal lubricating grease, and ensure that the axial oil groove 11 and the circumferential oil groove 12 store an appropriate amount of lubricating grease.

[0023] When in use, it is installed on the claw end of the shift fork to transmit mechanical action, and works in conjunction with the slider and slide shaft, push rod, spring, etc., so that the shift fork can smoothly transmit the driver's operating force to the gear, thereby achieving smooth and comfortable shifting.

[0024] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "set", "provided with", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A self-lubricating non-rolling element bearing for a shift fork, characterized in that: It includes an outer rolling element, a core shaft, a retaining spring and a sealing ring. The outer rolling element is a semi-closed cylindrical structure with a sealing structure at one end. A plurality of axial oil grooves are provided on the inner diameter surface of the outer rolling element along the axial direction. An outer rolling element retaining spring groove is provided in the middle of the inner diameter surface of the outer rolling element along the circumferential direction. A fillet is provided at one end of the core shaft and an oblique angle is provided at the other end. A core shaft retaining spring groove is provided on the core shaft corresponding to the position of the outer rolling element retaining spring groove. The core shaft is sleeved in the outer rolling element and locked in the outer rolling element retaining spring groove and the core shaft retaining spring groove through the retaining spring. A sealing ring stop is provided on the inner diameter surface of the outer rolling element near the opening end. The sealing ring is sleeved on the core shaft and in the sealing ring stop.

2. The self-lubricating non-rolling element bearing for a shift fork according to claim 1, characterized in that: A circumferential oil groove is provided on the inner diameter surface of the outer rolling body near the sealing end.

3. The self-lubricating non-rolling element bearing for a shift fork according to claim 1, characterized in that: The axial oil groove and the circumferential oil groove are in arc shape. There are three axial oil grooves which are evenly arranged along the circumference of the outer rolling element.

4. The self-lubricating non-rolling element bearing for a shift fork according to claim 1, characterized in that: The surface of the mandrel is provided with a DLC coating.

5. The self-lubricating non-rolling element bearing for a shift fork according to claim 1, characterized in that: The sealing ring stop is provided with a first chamfer near the inner diameter surface of the outer rolling element, and the sealing ring stop is provided with a second chamfer near the opening end of the outer rolling element.

Images