Universal joint dust cover
By setting evenly distributed inner and outer oil channels at the fitting position between the dustproof cover and the shaft sleeve, the problem of uneven oil distribution is solved, the uniformity of lubrication effect and dustproof effect is achieved, and the service life of the universal joint is extended.
Patent Information
- Application Number
- CN202422460388.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-10-11
AI Technical Summary
When the existing universal joint is filled with grease, the oil distribution is uneven, resulting in poor lubrication effect in some parts and affecting the service life.
Set evenly distributed inner and outer oil passages in the fitting position between the dust cover and the shaft sleeve along the circumference 360°. The width of the inner oil passage is greater than that of the outer oil passage to ensure uniform extrusion of the lubricating grease.
It achieves uniform distribution of lubricating grease, extends the service life of the universal joint and blocks dust from entering, improving the lubrication effect.
Smart Images
Figure CN223049271U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of universal joints, and particularly relates to a dust cover for a universal joint. Background Art
[0002] As Figure 1 、 2 shown, currently, when greasing a universal joint, grease is first injected from the grease nipple A (1'), and the grease flows through the middle oil passage (3') of the cross shaft A (2') to the bushing A (8'), and passes through the gaps between the needle rollers A (7'), then through the lip of the skeleton oil seal (5'), and then through the dust cover (4'), and finally overflows. The flow path of the grease is as shown by the arrow in the figure. A spring washer A (6') is arranged between the skeleton oil seal and the needle roller. At the fitting position between the dust cover and the bushing, since it is on the 360-degree circumference, no special oil passage is provided, so the grease is extruded randomly from any direction. When extrusion starts at a certain part, due to pressure relief, the subsequent grease will only be extruded from the pressure relief part. The grease will only be extruded from one part in the circumferential direction and will not be evenly distributed. The parts where the grease is not extruded will have poor lubrication effect, affecting the service life of the universal joint. Summary of the Utility Model
[0003] The purpose of the utility model is to overcome the deficiencies existing in the prior art, and provide a dust cover for a universal joint. At the fitting position between the dust cover and the bushing, 6 evenly distributed special oil passages are arranged along the 360° circumferential direction, and the grease will be evenly extruded from the oil passages.
[0004] The purpose of the utility model is achieved by the following technical solutions: This kind of dust cover for a universal joint includes a dust cover body, an oil seal, a bushing and a cross shaft. After the dust cover body and the bushing are assembled, they are sleeved on the journal of the cross shaft. Needle rollers are arranged between the journal and the bushing. An oil seal is arranged between the mouth of the bushing and the dust cover body. A spring washer is arranged between the oil seal and the needle roller; the oil seal is fixed to the bushing through an oil seal skeleton. A plurality of inner oil passages are opened on the inner end face, which is the end face where the dust cover body contacts the oil seal skeleton. A plurality of outer oil passages are opened on the outer end face, which is the end face where the dust cover body contacts the bushing. The cross shaft is provided with a grease nipple and an oil injection channel communicated with the grease nipple. When injecting grease, the lubricating grease enters the dust cover body through the oil seal, and then after passing through the inner oil passages and the outer oil passages, it is evenly extruded from the gap between the dust cover body and the bushing.
[0005] As a further technical solution, the inner oil passages are evenly opened along the circumferential direction of the inner end face.
[0006] As a further technical solution, the outer oil passages are evenly opened along the circumferential direction of the outer end face.
[0007] As a further technical solution, the positions of the inner oil channels on the inner end face correspond to the positions of the outer oil channels on the outer end face one by one.
[0008] As a further technical solution, the width of the inner oil channel is greater than the width of the outer oil channel.
[0009] As a further technical solution, the oil seal is provided with a lip B in contact with the journal of the cross shaft, and the dust cover body is provided with a lip A in contact with the oil seal skeleton.
[0010] The beneficial effects of the present utility model are as follows:
[0011] 1. Inner oil channels are evenly distributed on the inner end face where the dust cover body contacts the oil seal skeleton, and at the same time, outer oil channels are evenly distributed on the outer end face where the dust cover body contacts the shaft sleeve. Through the cooperation of the inner and outer oil channels, the lubricating grease passing through the oil seal can be evenly extruded from the gap between the dust cover body and the shaft sleeve;
[0012] 2. The dust cover body and the shaft sleeve are evenly lubricated, the service life is prolonged, and dust is blocked from entering;
[0013] 3. The positions of the inner and outer oil channels correspond to each other one by one, and the width of the inner oil channel is greater than the width of the outer oil channel, ensuring that the lubricating grease can smoothly enter the outer oil channel after being extruded from the inner oil channel. Description of the Drawings
[0014] Figure 1 is a schematic structural diagram of the prior art.
[0015] Figure 2 is Figure 1 a partial enlarged schematic diagram of area A in
[0016] Figure 3 is a schematic structural diagram of the present utility model.
[0017] Figure 4 is Figure 3 a partial enlarged schematic diagram of area B in
[0018] Figure 5 is a schematic structural diagram of the dust cover body in the present utility model.
[0019] Figure 6 is Figure 5 the view in the C direction of
[0020] Explanation of the reference numerals: oil nozzle A1’, cross shaft A2’, intermediate oil channel 3’, dust cover 4’, skeleton oil seal 5’, spring washer A6’, needle roller A7’, shaft sleeve A8’;
[0021] Dust cover body 1, inner oil passage 11, outer oil passage 12, inner end face 13, outer end face 14, lip A 15, oil seal 2, oil seal skeleton 21, lip B 22, spring washer 3, needle roller 4, bushing 5, cross shaft 6, oil nozzle 7, oil injection passage 8. Detailed implementation mode
[0022] The following will introduce the present utility model in detail with reference to the drawings:
[0023] Embodiment: As shown in the attached Figures 3 to 6 figures, this universal joint dust cover includes a dust cover body 1, an inner oil passage 11, an outer oil passage 12, an inner end face 13, an outer end face 14, a lip A 15, an oil seal 2, an oil seal skeleton 21, a lip B 22, a spring washer 3, a needle roller 4, a bushing 5, a cross shaft 6, an oil nozzle 7 and an oil injection passage 8.
[0024] Refer to the attached Figure 3 , 4 , after the dust cover body 1 and the bushing 5 are assembled, they are sleeved on the journal of the cross shaft 6. A circle of needle rollers 4 is arranged between the journal and the bushing 5. An oil seal 2 is arranged between the mouth of the bushing 5 and the dust cover body 1, and a spring washer 3 is arranged between the oil seal 2 and the needle roller 4. The oil seal 2 is fixed to the bushing 5 through the oil seal skeleton 21. A plurality of inner oil passages 11 are opened on the end face (i.e., the inner end face 13) where the dust cover body 1 contacts the oil seal skeleton 21. At the same time, a plurality of outer oil passages 12 are opened on the end face (i.e., the outer end face 14) where the dust cover body 1 contacts the bushing 5. The cross shaft 6 is provided with an oil nozzle 7 and an oil injection passage 8 communicated with the oil nozzle 7. When injecting oil, the lubricating grease enters the dust cover body 1 through the oil seal 2, and then after passing through the inner oil passage 11 and the outer oil passage 12, it is evenly extruded from the gap between the dust cover body 1 and the bushing 5.
[0025] Preferably, as shown in Figure 5 , 6 figures, six inner oil passages 11 are evenly opened along the circumferential direction of the inner end face 13, and six outer oil passages 12 are also evenly opened along the circumferential direction of the outer end face 14. Further, the positions of the inner oil passages 11 on the inner end face 13 correspond to the positions of the outer oil passages 12 on the outer end face 14 one by one, and the width of the inner oil passages 11 is greater than the width of the outer oil passages 12, which can ensure that the lubricating grease can smoothly enter the outer oil passages after being extruded from the inner oil passages.
[0026] Preferably, the oil seal 2 is provided with a lip B 22 in contact with the journal of the cross shaft 6, and the dust cover body 1 is provided with a lip A 15 in contact with the oil seal skeleton 21.
[0027] Working process of the present utility model: When filling grease into the universal joint, first inject grease from the grease nipple 7. The grease flows through the grease injection channel 8 of the cross shaft 6 to the shaft sleeve 5, then passes through the gap between the needle rollers 4, through the lip B22 of the skeleton oil seal 21, and then through the lip A15 of the dust cover body 1, and finally overflows. At the fitting position of the dust cover body 1 and the shaft sleeve 5, 6 inner oil channels 11 and outer oil channels 12 are evenly distributed along the circumferential direction of 360°. After the grease is evenly extruded from the inner oil channels 11 first, it then enters the outer oil channels 12 and is evenly extruded at the gap between the dust cover body 1 and the shaft sleeve 5.
[0028] It can be understood that for those skilled in the art, equivalent replacement or change of the technical solution and the inventive concept of the present utility model should fall within the protection scope of the appended claims of the present utility model.
Claims
1. A universal joint dust cover, characterized in that: The invention comprises a dust cover body (1), an oil seal (2), a shaft sleeve (5) and a cross shaft (6); the dust cover body (1) and the shaft sleeve (5) are assembled and sleeved on the shaft journal of the cross shaft (6); a needle roller (4) is arranged between the shaft journal and the shaft sleeve (5); an oil seal (2) is arranged between the mouth of the shaft sleeve (5) and the dust cover body (1); a spring washer (3) is arranged between the oil seal (2) and the needle roller (4); the oil seal (2) is fixed to the shaft sleeve (5) through an oil seal frame (21); the dust cover body (1) and the oil seal frame (21) are fixed to the shaft sleeve (5); A plurality of inner oil passages (11) are provided on the end surface (13) in contact with the shaft sleeve (5), i.e., the inner end surface (13), and a plurality of outer oil passages (12) are provided on the end surface (14) in contact with the shaft sleeve (5). An oil nozzle (7) and an oil injection passage (8) connected to the oil nozzle (7) are provided on the cross shaft (6). When oil is injected, the lubricating grease enters the dust cover body (1) through the oil seal (2), and then passes through the inner oil passage (11) and the outer oil passage (12), and is evenly squeezed out from the gap between the dust cover body (1) and the shaft sleeve (5).
2. The universal joint dust cover according to claim 1, characterized in that: The inner oil passage (11) is evenly opened along the circumferential direction of the inner end surface (13).
3. The universal joint dust cover according to claim 2, characterized in that: The outer oil passage (12) is evenly opened along the circumferential direction of the outer end surface (14).
4. The universal joint dust cover according to claim 3, characterized in that: The position of the inner oil passage (11) on the inner end surface (13) corresponds one to one with the position of the outer oil passage (12) on the outer end surface (14).
5. The universal joint dust cover according to claim 4, characterized in that: The width of the inner oil passage (11) is greater than the width of the outer oil passage (12).
6. The universal joint dust cover according to claim 1, characterized in that: The oil seal (2) is provided with a lip B (22) in contact with the journal of the cross shaft (6), and the dust cover body (1) is provided with a lip A (15) in contact with the oil seal frame (21).