Bearing grease injection tool

Abstract

The utility model discloses a bearing grease injection tool, which relates to the technical field of grease injection equipment, and comprises a fixed seat, a hub seat and a grease injection device, a bearing outer ring abuts against a supporting boss, and a bearing inner ring is sleeved on a positioning seat; a positioning boss is arranged in the middle of the positioning seat, a limiting groove matched with the positioning boss is formed in the grease injection seat, a grease injection cavity is formed between the grease injection seat and the positioning seat, a grease injection hole communicated with the grease injection cavity is formed in the grease injection seat, and a plurality of grease injection hole channels communicated with the bearing body and the grease injection cavity are formed in the grease injection seat; the two sets of grease injection devices are arranged on the two sides of the hub seat respectively, and a sealing cavity is formed between the two sets of grease injection devices and the hub seat. Therefore, by arranging the grease injection tool, the grease injection steps are simplified, the grease injection efficiency is improved, and it can be guaranteed that the surface of each roller is evenly covered with lubricating grease.

Description

Technical Field

[0001] This utility model relates to the field of grease injection equipment technology, specifically to a bearing grease injection fixture. Background Technology

[0002] Bearings have a wide range of applications in mechanical equipment, especially in rotating parts, to reduce friction and improve the service life of the parts.

[0003] There are many types of bearings. To improve processing efficiency, most bearings are standard parts. In the design process, the appropriate bearing model can be selected according to different application scenarios. In wheel hub units, due to the axial and radial forces, angular contact bearings are generally used, and grease is injected between the tapered rollers of the bearing to improve its service life. Grease has a high viscosity and requires tooling equipment.

[0004] In the prior art, there is a patent document with publication number CN207162095U, entitled "Grease Injection Fixture for Wheel Hub Bearings." This document describes a method that uses a grease injection head, a bearing fixing fixture, and a grease introduction fixture to slowly and evenly inject grease using a grease injection tool. However, the following problems may occur when using this equipment:

[0005] 1. This equipment can only grease one bearing at a time, which is inefficient and the positioning is not accurate enough. At the moment of grease injection, the internal pressure changes suddenly, which can cause the bearing to deviate. Therefore, the effect of use is not ideal.

[0006] 2. This equipment involves inserting grease between steel balls for grease injection. In actual operation, the amount of grease injected is usually a little larger to ensure that each surface is in contact with the grease.

[0007] 3. Bearings generally consist of an inner ring and an outer ring. The outer ring is fixed, while the inner ring is subject to the fit clearance and may float. When this device is in use, the positioning of the inner ring is not accurate enough, which can easily lead to grease injection failure. Utility Model Content

[0008] To overcome the above-mentioned defects, the purpose of this utility model is to provide a bearing grease injection fixture, which simplifies the grease injection process, improves grease injection efficiency, and ensures that the end face of each roller is covered with grease.

[0009] To achieve the above objectives, this utility model provides a bearing grease injection fixture, including a fixed seat, a hub seat, and a grease injection device. The hub seat has a hub cavity, and support bosses for placing the bearing body are respectively provided on both sides of the hub cavity. The grease injection device includes a grease injection seat and a positioning seat fixedly connected to the grease injection seat. The bearing body includes an inner bearing ring and an outer bearing ring. The outer bearing ring abuts against the support bosses, and the inner ring of the positioning seat is inserted into the inner bearing ring. A positioning boss is provided in the middle of the positioning seat, and a limiting groove adapted to the positioning boss is provided on the grease injection seat. A grease injection cavity is provided between the grease injection seat and the positioning seat. The grease injection seat has a grease injection hole communicating with the grease injection cavity, and a plurality of grease injection channels communicating with the bearing body and the grease injection cavity respectively. There are two sets of grease injection devices, respectively provided on both sides of the hub seat, and a sealed cavity is formed between the two sets of grease injection devices and the hub seat.

[0010] Preferably, the grease injection seat is further provided with a first boss and a second boss, the first boss being engaged with the circumferential surface of the inner ring of the bearing, and the lower surface of the second boss abutting against the upper surface of the outer ring of the bearing.

[0011] Preferably, the gap between the first boss and the second boss is greater than the gap between the inner ring of the bearing and the outer ring of the bearing.

[0012] Preferably, the grease injection channel is located between the first boss and the second boss.

[0013] Preferably, the fixing seat and the grease injection seat are fixedly connected by a threaded fastener, and the threaded fastener is located in the middle of the grease injection seat.

[0014] The beneficial technical effects achieved by this utility model after adopting the above technical solution are as follows:

[0015] 1. Because grease injection devices are installed on both sides of the wheel hub, the two devices can share a single grease injection machine to inject grease into the two bearings within a single wheel hub. Therefore, the entire process can be completed in one step with almost no need for moving equipment. After grease injection, the bearing body within the wheel hub can be directly sealed. The entire grease injection process described above simplifies the steps, improves the grease injection effect, and prevents the grease from becoming contaminated with dust and impurities due to prolonged exposure to air, thus extending the service life of the bearing body.

[0016] 2. Due to the presence of a positioning seat, a first boss, and a second boss, the positioning seat extends deep into the inner ring of the bearing and is used for axial positioning of the inner ring. The first boss is used for snap-fitting and fixing the outer circumferential surface of the inner ring, and the second boss is used to press down on the bearing body. Therefore, even if the pressure changes suddenly during the grease injection process, the inner ring of the bearing will not tilt or shake. As a result, the grease injection equipment used can stably inject grease into the gaps of the rollers, and the end face of each roller is evenly covered with grease, which can improve the service life of the bearing, especially suitable for tapered roller bearings. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0018] Figure 2 This is a cross-sectional view of the internal structure of this utility model;

[0019] In the diagram,

[0020] 1. Fixed base;

[0021] 2. Hub seat; 21. Hub cavity; 22. Support boss;

[0022] 3. Grease injection device; 31. Grease injection seat; 311. Grease injection hole; 312. Grease injection cavity; 313. Grease injection channel; 314. First boss; 315. Second boss; 32. Positioning seat; 321. Positioning boss; 322. Limiting groove;

[0023] 4. Bearing body; 41. Bearing inner ring; 42. Bearing outer ring. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0025] See Figures 1-2 This utility model provides a bearing grease injection fixture, including a fixed seat 1, a hub seat 2, and a grease injection device 3. The fixed seat 1 is used to connect the grease injection device 3. In actual use, the hub seat 2 is generally placed on a specific bracket and used with a grease injection machine. The grease injection machine is existing equipment and can be purchased as needed.

[0026] The hub housing 2 has a hub cavity 21, and support bosses 22 for placing the bearing body 4 are respectively provided on both sides of the hub cavity 21; the grease injection device 3 includes a grease injection seat 31 and a positioning seat 32 fixedly connected to the grease injection seat 31; the bearing body 4 includes an inner bearing ring 41 and an outer bearing ring 42; the outer bearing ring 42 abuts against the support bosses 22, and the inner bearing ring 41 is fitted onto the positioning seat 32; the positioning seat 32 has a positioning boss 321 in the middle, and the grease injection seat 3... The wheel hub 2 is equipped with a limiting groove 322 that matches the positioning boss 321. A grease injection cavity 312 is provided between the grease injection seat 31 and the positioning seat 32. The grease injection seat 31 has a grease injection hole 311 that connects to the grease injection cavity 312. The grease injection seat 31 has several grease injection channels 313 that connect the bearing body 4 and the grease injection cavity 312 respectively. There are two sets of grease injection devices 3, which are respectively set on both sides of the wheel hub 2. The two sets of grease injection devices 3 and the wheel hub 2 form a sealed cavity. The wheel hub 2 of heavy vehicles generally contains two bearing bodies 4. This utility model is particularly suitable for tapered roller bearings, and grease is injected from the large tapered surface of the tapered roller bearing. In use, the bearing body 4 is first placed on the support boss 22 of the wheel hub 2, and the outer ring 42 of the bearing body 4 abuts against the support boss 22. The outer ring 42 of the bearing is pressed directly into the hub seat 2 by other pressure equipment. After the position is pressed in correctly, the tapered rollers, the fixing parts and the inner ring 41 of the bearing are placed. This part is the prior art.

[0027] Two grease injection devices 3 are fixed respectively. To facilitate mass production, one model of grease injection seat 31 is generally adapted to one model of bearing body 4. After the bearing body 4 is placed, the inner ring of the positioning seat 32 in the grease injection device 3 is inserted into the bearing inner ring 41 to achieve pre-positioning. The positioning seat 32 is first inserted into the bearing inner ring 41 to ensure that the two are aligned. The second boss 315 at the lower end of the grease injection seat 31 presses down on the bearing outer ring 42, and the first boss 314 presses down, cooperating with the positioning seat 32 to lock and fix the bearing inner ring 41, preventing it from shaking. This ensures that the bearing body 4, especially the bearing inner ring 41, does not shake during the entire grease injection process. The positioning seat 32 is used for limiting. During connection, the positioning seat 32 and the grease injection seat 31 are connected by the cooperation of the positioning boss 321 and the limiting groove 322 to ensure the stability of the connection position. Since the entire positioning reference is based on the central axis, the grease injection device 3 after installation can ensure the accuracy of the position.

[0028] Multiple grease injection channels 313 are provided between the first boss 314 and the second boss 315. Grease from the grease injection machine enters the gap between the inner ring 41 and the outer ring 42 of the bearing through the grease injection holes 311, the grease injection chamber 312, and then through the grease injection channels 313. During the entire grease injection process, the two grease injection devices 3 should be sealed. Generally, grease is injected into one bearing body 4 at a time. The grease injection seat 31 and the positioning seat 32 are fixedly connected and are provided with multiple sealing rings to ensure sealing. The sealing rings are existing technology and have extremely wide applications in mechanical seals.

[0029] The gap between the first boss 314 and the second boss 315 of this utility model is greater than the gap between the inner ring 41 and the outer ring 42 of the bearing. The first boss 314 and the second boss 315 are used to limit the position and ensure that the grease flows to the correct position.

[0030] In this invention, the fixed base 1 and the grease injection seat 31 are fixedly connected by threaded fasteners, which are located in the middle of the grease injection seat 31. The fixed base 1 is used for support and fixation, and the threaded fasteners ensure the stability of the equipment after connection. Both the fixed base 1 and the grease injection seat 31 are based on the central axis. In addition to using threaded fasteners, direct welding can also be used for fixation, as long as the position is accurate.

[0031] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. A bearing grease injection fixture, comprising a fixed seat, a hub seat, and a grease injection device, wherein the hub seat has a hub cavity, and support bosses for placing a bearing body are respectively provided on both sides of the hub cavity; the grease injection device includes a grease injection seat and a positioning seat fixedly connected to the grease injection seat, and the bearing body includes an inner bearing ring and an outer bearing ring; characterized in that, The outer ring of the bearing abuts against the support boss, and the inner ring of the positioning seat is inserted into the inner ring of the bearing. The positioning seat has a positioning boss in the middle, the grease injection seat has a limiting groove that matches the positioning boss, a grease injection cavity is provided between the grease injection seat and the positioning seat, the grease injection seat has a grease injection hole that communicates with the grease injection cavity, and the grease injection seat has a plurality of grease injection channels that communicate with the bearing body and the grease injection cavity respectively. The grease injection device consists of two sets, which are respectively installed on both sides of the wheel hub seat, and a sealed cavity is formed between the two sets of grease injection devices and the wheel hub seat.

2. The bearing grease injection fixture according to claim 1, characterized in that, The grease injection seat is also provided with a first boss and a second boss. The first boss is engaged with the circumferential surface of the inner ring of the bearing, and the lower surface of the second boss abuts against the upper surface of the outer ring of the bearing.

3. The bearing grease injection fixture according to claim 2, characterized in that, The gap between the first boss and the second boss is greater than the gap between the inner ring of the bearing and the outer ring of the bearing.

4. The bearing grease injection fixture according to claim 3, characterized in that, The grease injection channel is located between the first boss and the second boss.

5. The bearing grease injection fixture according to claim 1, characterized in that, The fixed seat and the grease injection seat are fixedly connected by a threaded fastener, which is located in the middle of the grease injection seat.

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