A cross-axis universal joint
By adopting multiple sealing structures and oil conduction channels in the cross-axis universal joint, the problems of mud and water impact and lubricating oil management are solved, achieving a longer service life and better dust protection effect.
Patent Information
- Application Number
- CN202110490371.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-05-06
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2041-05-06
AI Technical Summary
The existing cross-axis universal joints are easily affected by mud and water during use, resulting in reduced performance and shortened service life. At the same time, the regular addition of lubricating oil and dustproofing are poor.
A cross-axis universal joint including an outer oil seal, an inner oil seal, a compensation oil seal and a compression screw sleeve is designed. Through multiple sealing structures and oil conduction channels, the effective distribution of lubricating oil and dustproof effect is ensured, and through springs and seals The skirt improves sealing and structural strength.
It achieves effective lubrication and dust protection, extends the service life of the universal joint, and maintains the sealing property of the lubricant through the seal compensation mechanism to avoid seal failure after leakage and wear.
Smart Images
Figure CN113294448B_ABST
Abstract
Description
[Technical field]
[0001] The invention relates to the technical field of universal joint parts, in particular to a cross-axis universal joint. [Background technology]
[0002] The existing cross-axis universal joint generally includes a cross-axis, an outer ring, a needle roller and an oil seal. The outer ring is a cylindrical barrel with one end closed. The outer ring sleeve is arranged on the journal of the cross-axis. The needle rollers are circumferentially distributed on the inner wall of the outer ring. The oil seal is arranged in the open end of the outer ring. A needle roller assembly composed of several needle rollers is arranged between the sleeve and the shaft head. In order to ensure the stable working state of the cross-axis universal joint, the needle roller assembly needs to be regularly added with lubricating oil to ensure the use effect. In addition, when the cross-axis universal joint is in use, muddy water can easily enter the bearing, which has a great impact on the performance and service life of the cross-axis universal joint. Now a cross-axis universal joint is proposed. [Summary of the invention]
[0003] The purpose of the present invention is to solve the problems in the prior art and to provide a cross-axis universal joint which is easy to lubricate, ensures the lubrication state of the needle roller, prolongs the service life of the universal joint, and can effectively prevent dust.
[0004] To achieve the above-mentioned purpose, the present invention proposes a cross-axis universal joint, comprising a cross-axis body, a bearing outer ring and a needle roller, wherein the cross-axis body has four shaft heads, each of which is provided with a bearing outer ring, and a plurality of needle rollers are arranged circumferentially between the two shaft heads, and further comprising an outer oil seal, an inner oil seal, a compensating oil seal, a compression screw sleeve and an oil storage cavity, wherein the outer oil seal is installed on the shaft head, the inner oil seal is installed on the inner side of the bearing outer ring, the outer side of the bearing outer ring is provided with a compensating oil seal and a compression screw sleeve, and the compensating oil seal is provided with a It is placed between the outer oil seal and the inner oil seal, one side of the outer oil seal is against the first step groove on the shaft head, and the other side is against the compensation oil seal. The clamping screw sleeve is threadedly connected with the outer ring of the bearing to drive the compensation oil seal to press against the outer oil seal. The outer ring of the inner oil seal is clamped on the second step groove in the outer ring of the bearing, and the inner ring is against the outer wall of the shaft head; an oil storage chamber is provided in the cross shaft body, and an oil guide channel connected with the oil storage chamber is provided in the shaft head to guide the lubricating oil to the needle roller in the outer ring of the bearing.
[0005] Preferably, an installation cavity is provided on the inner wall of the compression screw sleeve, a spring is provided in the installation cavity, and the spring abuts against the compensating oil seal.
[0006] Preferably, the outer oil seal includes a first support frame and a first sealing body, a first support frame is provided on the side of the first sealing body facing the first step groove, and a plurality of inclined first sealing skirts are provided on the side facing the compensating oil seal, the first sealing skirt is tightly matched with the side wall of the compensating oil seal, the outer ring of the first sealing body is provided with a second sealing skirt, and the second sealing skirt abuts against the outer ring of the compensating oil seal; the outer ring of the first support frame is provided with a first folded edge for supporting the second sealing skirt, and the inner wall of the second sealing skirt is provided with a sealing protrusion with a serrated cross-section.
[0007] Preferably, the inner oil seal includes a second support frame and a second sealing body, a second support frame is provided on the side of the second sealing body facing the second step groove, the inner ring of the second sealing body is provided with a first sealing lip and a second sealing lip, the first sealing lip and the second sealing lip abut against the outer wall of the shaft head, the end of the second sealing lip is provided with a third sealing lip extending radially outward, the inner ring of the compensating oil seal abuts against the outer wall of the third sealing lip, so that the first sealing lip, the second sealing lip and the third sealing lip shrink inward and fit tightly with the shaft head.
[0008] Preferably, the compensating oil seal includes a third support frame and a third sealing body coated on the third support frame, the third support frame is clamped on the outer side of the bearing outer ring, the inner ring of the third support frame has a retaining edge extending radially inward, the third sealing body has a sealing layer on the side facing the outer oil seal, the sealing layer is coated on the retaining edge, the outer oil seal is tightly matched with the sealing layer, the inner ring of the third sealing body is provided with a third sealing skirt, the third sealing skirt is tightly matched with the inner oil seal, the outer ring of the third sealing body is provided with an outer sealing body, the outer sealing body is tightly matched with the outer oil seal, the outer wall of the outer sealing body is a conical surface, and the end facing the outer oil seal is a small diameter end.
[0009] Preferably, two oil storage chambers are symmetrically provided in the cross shaft body, and the two ends of the oil storage chambers are respectively connected to the oil guide channels in the two adjacent shaft heads. The end surface of the shaft head is provided with an annular oil guide groove communicating with the oil guide channel, and the outer side of the annular oil guide groove is provided with a plurality of radial oil outlet grooves. Two oil filling nozzles respectively communicating with the oil storage chambers are symmetrically installed on the cross shaft body.
[0010] Beneficial effects of the present invention: The present invention realizes multiple seals through the cooperation of the outer oil seal, the inner oil seal and the compensating oil seal, which can effectively prevent dust and avoid leakage of internal lubricating grease. By adding a clamping screw sleeve, the position of the compensating oil seal can be adjusted to ensure that the compensating oil seal after wear can still maintain a sealed state with the outer oil seal and the inner oil seal, thereby achieving the effect of sealing compensation. Adding a spring in the clamping screw sleeve can apply a force to the compensating oil seal and increase the tightness of the pressure with the outer oil seal and the inner oil seal. In addition, lubricating grease can be stored in the oil storage chamber, and the lubricating grease can be introduced into the area between the outer ring of the bearing and the shaft head through the oil guide channel to contact the needle roller.
[0011] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.
Brief Description of the Drawings
[0012] Figure 1 It is a schematic diagram of the internal structure of a cross-axis universal joint of the present invention;
[0013] Figure 2 It is a cross-sectional schematic diagram of an outer oil seal of a cross-axis universal joint of the present invention;
[0014] Figure 3 It is a cross-sectional schematic diagram of an inner oil seal of a cross-axis universal joint of the present invention.
[0015] Figure 4 It is a cross-sectional schematic diagram of a compensating oil seal of a cross-axis universal joint of the present invention;
[0016] Figure 5 The present invention is a schematic diagram of the end surface structure of the shaft head of a cross-axis universal joint. [Specific implementation method]
[0017] See also Figures 1 to 5The present invention discloses a cross-axis universal joint, comprising a cross-axis body 1, a bearing outer ring 7 and a needle roller 8. The cross-axis body 1 has four shaft heads 11, on which the bearing outer rings 7 are respectively installed, and a plurality of needle rollers 8 are circumferentially arranged between the two shaft heads. The cross-axis universal joint is characterized in that it also comprises an outer oil seal 2, an inner oil seal 3, a compensating oil seal 4, a pressing screw sleeve 5 and an oil storage cavity 6. The outer oil seal 2 is installed on the shaft head 11, the inner oil seal 3 is installed on the inner side of the bearing outer ring 7, the outer side of the bearing outer ring 7 is installed with a compensating oil seal 4 and a pressing screw sleeve 5, and the compensating oil seal 4 is arranged on the outer side. Between the oil seal 2 and the inner oil seal 3, one side of the outer oil seal 2 abuts against the first step groove 12 on the shaft head 11, and the other side abuts against the compensating oil seal 4. The pressing screw sleeve 5 is threadedly connected to the bearing outer ring 7 to drive the compensating oil seal 4 to press against the outer oil seal 2. The outer ring of the inner oil seal 3 is clamped on the second step groove 70 in the bearing outer ring 7, and the inner ring abuts against the outer wall of the shaft head 11; an oil storage chamber 6 is provided in the cross shaft body 1, and an oil guide channel 61 connected to the oil storage chamber 6 is provided in the shaft head 11 to guide the lubricating oil to the needle roller 8 in the bearing outer ring 7.
[0018] Furthermore, the inner wall of the compression screw sleeve 5 is provided with an installation cavity 51, and a spring 52 is provided in the installation cavity 51, and the spring 52 abuts against the compensation oil seal 4, and the outer wall of the compression screw sleeve 5 has anti-slip spiral patterns to facilitate position adjustment. The inner wall of the compression screw sleeve 5 is provided with an internal thread cavity, and the outer wall of one end of the bearing outer ring 7 facing the outer oil seal 2 is provided with an external thread that matches the compression screw sleeve 5.
[0019] Further, see Figure 2 The outer oil seal 2 includes a first support frame 21 and a first sealing body 22. The first support frame 21 is provided on the side of the first sealing body 22 facing the first step groove 12, and a plurality of inclined first sealing skirts 222 are provided on the side facing the compensation oil seal 4. The first sealing skirt 222 is tightly matched with the side wall of the compensation oil seal 4. The outer ring of the first sealing body 22 is provided with a second sealing skirt 221, and the second sealing skirt 221 abuts against the outer sealing body 422 of the outer ring of the compensation oil seal 4; the outer ring of the first support frame 21 is provided with a first folded edge 211 for supporting the second sealing skirt 221, and the inner wall of the second sealing skirt 221 is provided with a sealing protrusion 2210 with a serrated cross-section.
[0020] Further, see Figure 3The inner oil seal 3 includes a second support frame 31 and a second sealing body 32. The second sealing body 32 is provided with an L-shaped second support frame 31 on one side facing the second step groove 70. The inner ring of the second sealing body 32 is provided with a first sealing lip 321 and a second sealing lip 322. The first sealing lip 321 and the second sealing lip 322 abut against the outer wall of the shaft head 11. The end of the second sealing lip 322 is provided with a third sealing lip 323 extending radially outward. The third sealing skirt 421 of the inner ring of the compensating oil seal 4 abuts against the outer wall of the third sealing lip 323, so that the first sealing lip 321, the second sealing lip 322, and the third sealing lip 323 shrink inward and fit closely with the shaft head 11.
[0021] Further, see Figure 4 The compensating oil seal 4 includes a third support frame 41 and a third sealing body 42 coated on the third support frame 41. The third support frame 41 is clamped on the outer side of the bearing outer ring 7. The inner ring of the third support frame 41 has a retaining edge 411 extending radially inward. The third sealing body 42 has a sealing layer 423 on the side facing the outer oil seal 2. The sealing layer 423 is coated on the retaining edge 411. The first sealing skirt 222 of the outer oil seal 2 is tightly matched with the sealing layer 423. The inner ring of the third sealing body 42 is provided with a third sealing skirt 421, and the third sealing skirt 421 is tightly matched with the inner oil seal 3. The outer ring of the third sealing body 42 is provided with an outer sealing body 422, and the outer sealing body 422 is tightly matched with the outer oil seal 2. The outer wall of the outer sealing body 422 is a conical surface, and the end facing the outer oil seal 2 is a small diameter end. The outer ring of the third support frame 41 has a second folded edge 412 extending outward.
[0022] Further, see Figure 1 and Figure 5 Two oil storage chambers 6 are symmetrically arranged in the cross shaft body 1, and the two ends of the oil storage chamber 6 are respectively connected to the oil guide channels 61 in the two adjacent shaft heads 11. The end surface of the shaft head 11 is provided with an annular oil guide groove 111 communicating with the oil guide channel 61, and the outer side of the annular oil guide groove 111 is provided with a plurality of radial oil outlet grooves 112. Two oil injection nozzles 60 respectively communicating with the oil storage chambers 6 are symmetrically installed on the cross shaft body 1.
[0023] Working process of the present invention:
[0024] The working principle of a cross-axis universal joint of the present invention is as follows: through the cooperation of the outer oil seal 2, the inner oil seal 3, and the compensating oil seal 4, multiple seals are achieved, which can effectively prevent dust and avoid leakage of internal lubricating grease. The compensating oil seal 4 can be pressed against the outer oil seal 2 by rotating the compression screw sleeve 5, ensuring that the compensating oil seal 4 after wear can still maintain a sealed state with the outer oil seal 2 and the inner oil seal 3, and the sealing lip of the inner oil seal 3 can be closely matched with the shaft head to achieve the effect of sealing compensation. A spring 52 is added in the compression screw sleeve 5, which can apply a force to the compensating oil seal 4, increase its pressing tightness with the outer oil seal and the inner oil seal, and the third sealing skirt 421 can make the first sealing lip 321, the second sealing lip 322, and the third sealing lip 323 shrink inward and closely match the shaft head 11. By adding a support frame to the outer oil seal, the inner oil seal, and the compensating oil seal, the structural strength can be improved.
[0025] The lubricating grease can be stored in the oil storage chamber 6 through the oil injection nozzle 60, and the lubricating grease can be introduced into the area between the bearing outer ring 7 and the shaft head 11 through the oil guide channel 61 to contact the needle roller 8. The shorter radial oil outlet groove 112 on the annular oil guide groove 111 can further ensure that the internal grease is evenly distributed and improve the lubrication effect.
[0026] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.
Claims
1. A cross-axis universal joint, comprising a cross-axis body (1), a bearing outer ring (7) and a needle roller (8), wherein the cross-axis body (1) has four shaft heads (11), each of which is provided with a bearing outer ring (7), and a plurality of needle rollers (8) are arranged circumferentially between the shaft heads (11). Features: It also comprises an outer oil seal (2), an inner oil seal (3), a compensating oil seal (4), a pressing screw sleeve (5) and an oil storage chamber (6), wherein the outer oil seal (2) is mounted on the shaft head (11), the inner oil seal (3) is mounted on the inner side of the bearing outer ring (7), the outer side of the bearing outer ring (7) is mounted with a compensating oil seal (4) and a pressing screw sleeve (5), the compensating oil seal (4) is arranged between the outer oil seal (2) and the inner oil seal (3), one side of the outer oil seal (2) abuts against a first stepped groove (12) on the shaft head (11), and the other side abuts against the compensating oil seal (4), the pressing screw sleeve (5) is threadedly connected to the bearing outer ring (7) to drive the compensating oil seal (4) to press against the outer oil seal (2), the outer ring of the inner oil seal (3) is clamped on the second stepped groove (70) in the bearing outer ring (7), and the inner ring abuts against the outer wall of the shaft head (11);An oil storage chamber (6) is provided in the cross shaft body (1), and an oil guide channel (61) is provided in the shaft head (11) and is connected to the oil storage chamber (6) for guiding lubricating oil to the needle roller (8) in the outer ring (7) of the bearing. The outer oil seal (2) comprises a first support frame (21) and a first sealing body (22). The first support frame (21) is provided on a side of the first sealing body (22) facing the first stepped groove (12), and a plurality of inclined first sealing skirts (222) are provided on a side facing the compensation oil seal (4). The first sealing skirt (222) is tightly matched with a side wall of the compensation oil seal (4). A sealing body (22) has an outer ring provided with a second sealing skirt (221), the second sealing skirt (221) abutting against the outer ring of a compensating oil seal (4), the inner oil seal (3) comprising a second support frame (31) and a second sealing body (32), the second sealing body (32) having a second support frame (31) on a side facing the second stepped groove (70), the inner ring of the second sealing body (32) having a first sealing lip (321) and a second sealing lip (322), the first sealing lip (321) and the second sealing lip (322) abutting against the outer wall of the shaft head (11), the second sealing lip (322) The end portion is provided with a third sealing lip (323) extending radially outward, the inner ring of the compensating oil seal (4) abuts against the outer wall of the third sealing lip (323), so that the first sealing lip (321), the second sealing lip (322), and the third sealing lip (323) shrink inwardly and fit tightly with the shaft head (11), the compensating oil seal (4) comprises a third support frame (41) and a third sealing body (42) covered on the third support frame (41), the third support frame (41) is clamped on the outer side of the bearing outer ring (7), the inner ring of the third support frame (41) has a retaining edge (411) extending radially inwardly, and the third sealing body A sealing layer (423) is provided on the side of the third sealing body (42) facing the outer oil seal (2), the sealing layer (423) is coated on the retaining edge (411), the outer oil seal (2) and the sealing layer (423) are closely matched, the inner ring of the third sealing body (42) is provided with a third sealing skirt (421), the third sealing skirt (421) is closely matched with the inner oil seal (3), the outer ring of the third sealing body (42) is provided with an outer sealing body (422), the outer sealing body (422) is closely matched with the outer oil seal (2), the outer wall of the outer sealing body (422) is a conical surface, and the end facing the outer oil seal (2) is a small diameter end. ; 2. A cross-axis universal joint as claimed in claim 1, Features: The inner wall of the compression screw sleeve (5) is provided with a mounting cavity (51), a spring (52) is arranged in the mounting cavity (51), and the spring (52) abuts against the compensation oil seal (4).
3. A cross-axis universal joint as claimed in claim 1, Features: Two oil storage chambers (6) are symmetrically arranged in the cross shaft body (1), and the two ends of the oil storage chamber (6) are respectively connected to the oil guide channels (61) in the two adjacent shaft heads (11). The end surface of the shaft head (11) is provided with an annular oil guide groove (111) communicating with the oil guide channel (61), and the outer side of the annular oil guide groove (111) is provided with a plurality of radial oil outlet grooves (112). The cross shaft body (1) is symmetrically mounted with two oil injection nozzles (60) respectively communicating with the oil storage chambers (6).