Anti-drop dust cover for drive shaft universal joint and transmission assembly
By adopting a limit block and reinforcement structure in the dust cover, combined with the bump and flange design, the complexity and disengagement problems of the existing dust cover are solved, and lightweight, sealing and service life are improved.
Patent Information
- Application Number
- CN201911366883.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2019-12-26
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2039-12-26
AI Technical Summary
The existing dust shield has a complex structure, large volume and mass, a long molding cycle, large internal stress, which can easily cause deformation, increase manufacturing cost, and it is difficult to effectively prevent the rollers in the universal joint of the drive shaft.
An anti-detachment dustproof cover is designed, adopting a limit block and reinforcement structure. The limit block is set on the inner wall of the connecting section, and the arc surface of the outer ring of the roller comes into contact with the limit block to prevent the roller from falling apart and passing through the bumps and convexes. The edge structure reduces weight and increases sealing performance.
It effectively reduces the weight of the dust cover, improves sealing performance and fixing firmness, extends service life, and simplifies structural design.
Smart Images
Figure CN113048159B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a transmission joint, in particular to an anti-slip dust cover for a drive shaft universal joint and a transmission assembly. Background Art
[0002] The drive shaft is connected between the gear transmission and the wheel of the motor vehicle. The drive shaft includes a fixed end and a telescopic end. The end connected to the gear transmission is the telescopic end, and the end connected to the wheel hub is the fixed end. The telescopic end of the drive shaft includes an input shaft, an output shaft, and a drive shaft joint (also called a constant velocity joint, abbreviated as CVJ) connecting the input shaft and the output shaft. The drive shaft joint includes a female part located at the end of the input shaft and a male part located at the end of the output shaft. The female part at the end of the input shaft includes a housing, which can be a three-column groove housing, and the male part at the end of the output shaft includes a rolling bearing, which is suitable for inserting into the housing through the open end of the housing of the female part. Power is transmitted from the engine or motor to the gear transmission, and then transmitted to the input shaft and the female part through the gear transmission, and then transmitted to the male part by the female part, and the female part and the male part rotate at the same speed. The male part can also slide axially and swing angularly in the female part. When the male part slides relative to the female part, the rolling bearing of the male part rolls. Generally, the swing angle between the male part and the female part is between 0° and 25°.
[0003] Generally, the function of the dust cover (English name Boots) is to protect the drive shaft joint from the intrusion of mud, water, gray sand and / or any other pollutants; to form a closed space so that the grease does not leak out in the space, thereby fully lubricating the operation between the bearing and the housing. The dust cover is usually hollow trumpet-shaped, including a first open end, a bellows cylinder, a connecting section and a second open end, wherein the opening of the first open end is smaller than the opening of the second open end. After the dust cover is put on the drive shaft universal joint, the opening of the first open end of the dust cover is sleeved on the output shaft, and the opening of the second open end is sleeved on the open end of the mother housing.
[0004] The rolling bearing included in the male part at the end of the output shaft includes a plurality of wheel-shaped rollers, usually three wheel-shaped rollers.
[0005] In the prior art, the dust cover usually has a peripheral shoulder, and the surface of the peripheral shoulder facing the second end of the dust cover is provided with a groove that is offset in an angular direction and open toward the second end, and the interior of each groove forms a base with a concave support surface, which is suitable for accommodating the roller in a partially mutually matching manner, and is suitable for forming a surface for accommodating the roller in a push-contact manner. However, the existing dust cover has a complex structure, a large volume or capacity and mass, a long molding cycle, a large internal stress, and is prone to deformation, which increases the manufacturing cost. Summary of the invention
[0006] The object of the present invention is to provide a dust cover for an anti-slip type drive shaft universal joint and a transmission assembly to solve the technical problems mentioned in the background technology.
[0007] To achieve the above-mentioned purpose, the specific technical scheme of an anti-dropout type dust cover for a drive shaft universal joint and a transmission assembly of the present invention is as follows:
[0008] A dust cover for an anti-dropping drive shaft universal joint is used on a transmission joint, the transmission joint comprises a female part located at the end of an input shaft and a male part located at the end of an output shaft, the female part comprises a housing, the male part comprises a rolling bearing, the rolling bearing comprises a plurality of rollers, and is inserted into the housing through the open end of the housing of the female part;
[0009] The dust cover includes a main body, which includes a first open end, a corrugated cylinder, a connecting section and a second open end in sequence. The opening of the first open end is smaller than the opening of the second open end. The first open end of the dust cover is fixed on the output shaft, and the second open end of the dust cover is fixed on the mother part.
[0010] Furthermore, the dust cover also includes a limit block and a reinforcing rib connected to the limit block. The limit block is arranged on the inner surface of the connecting section. When the dust cover is in a stretched state, the roller is placed in the second open end and the outer arc surface of the roller contacts the limit block. The limit block prevents the roller from detaching from the mother part.
[0011] Furthermore, the limit blocks include at least two groups, each group of limit blocks includes at least two, the inner wall of the connecting section is provided with a plurality of spaced-apart recesses and protrusions, each group of limit blocks is respectively arranged on the connecting section at the recesses, and the limit blocks have a surface matching the arc surface of the outer ring of the roller.
[0012] Furthermore, the thickness of the limit block gradually decreases in the direction away from the corrugated cylinder, and the limit block is a wedge-shaped block.
[0013] Furthermore, a reinforcing rib is provided on the limit block opposite to the surface, and the reinforcing rib is fixedly connected to the inner wall of the connecting section. The reinforcing rib includes at least one, and when the second open end is fixed to the open end of the mother component, the end face of the open end of the mother component is in contact with or close to the reinforcing rib.
[0014] Furthermore, the axial length of the limit block is greater than the axial length of the reinforcing rib, and when the second open end is fixed to the open end of the mother component, the end of the limit block extends into the open end of the mother component, and the limit block contacts or approaches the inner wall of the mother component.
[0015] A transmission assembly includes a female component located at the end of an input shaft, a male component located at the end of an output shaft, and the above-mentioned anti-slip type dust cover for a drive shaft universal joint, wherein the female component includes a housing, the male component includes a rolling bearing, and the rolling bearing includes a plurality of rollers inserted into the housing through the open end of the housing of the female component, the first open end of the dust cover is fixed to the output shaft, and the second open end of the dust cover is fixed to the female component.
[0016] Furthermore, a protrusion is circumferentially arranged at the edge of the outer wall of the second open end, and the protrusion includes at least three protrusions. An annular flange is arranged on the outer wall of the second open end connected to the connecting section. When the second open end is fixed to the open end of the mother part, it is fixed by a clamp, and the protrusion and the flange prevent the clamp from detaching.
[0017] Furthermore, a convex ridge is arranged on the inner wall of the second open end along the circumferential direction, and a mounting groove matching the convex ridge is arranged on the outer wall of the open end of the female component.
[0018] Furthermore, an annular limiting edge is arranged on the inner wall of the first open end, a limiting groove cooperating with the limiting edge is arranged on the output shaft, a plurality of ribs are arranged along the circumferential direction at the outer wall edge of the first open end, and the clamp is clamped on the outer wall of the first open end.
[0019] The anti-dropout dust cover for the drive shaft universal joint and the transmission assembly of the present invention have the following advantages:
[0020] The dust cover of the present invention can effectively reduce the weight of the dust cover by directly setting the limit block in the body, and when the male part moves toward the open end of the female part, the outer ring surface of the roller contacts the limit block, on the one hand, preventing the roller from detaching from the female part; on the other hand, the limit structure can play a good buffering role, and release the locking force or friction force in advance when the male part moves away from the open end of the female part. The axial length of the limit block is longer than the axial length of the reinforcing rib. When the outer ring surface of the roller contacts the limit block, the limit block presses the female part, effectively preventing the roller from detaching.
[0021] Furthermore, the dust cover of the present invention, based on the existing dust cover, is provided with an independent protrusion on the outer wall of the second open end, which can also reduce the weight of the dust cover.
[0022] Finally, the transmission assembly of the present invention has a simple structure, is firmly fixed, has good sealing performance and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 A top view of the dust cover of the present invention;
[0024] Figure 2 It is a front view of the dust cover of the present invention;
[0025] Figure 3 is a three-dimensional diagram of the dust cover of the present invention;
[0026] Figure 4 It is a cross-sectional view of a dust cover in a transmission assembly in a stretched state;
[0027] Figure 5 for Figure 4 Detailed view of point A in the middle;
[0028] Figure 6 A cross-sectional view of the dust cover in the transmission assembly when it is in a compressed state.
[0029] Explanation of the numbers in the figure: 1. output shaft; 11. roller; 2. mother part; 21. input shaft; 3. main body; 31. first open end; 32. corrugated cylinder; 33. second open end; 331. protrusion; 332. convex ridge; 333. bump; 334. flange; 34. connecting section; 4. limit block; 41. reinforcing rib. DETAILED DESCRIPTION
[0030] In order to better understand the purpose, structure and function of the present invention, the following is a further detailed description of an anti-slip dust cover for a drive shaft universal joint and a transmission assembly of the present invention in conjunction with the accompanying drawings.
[0031] The anti-slip type drive shaft universal joint dust cover of the present invention is used on the transmission joint, and the transmission joint includes a female part 2 located at the end of the input shaft 21 and a male part located at the end of the output shaft 1. The female part 2 includes a housing, and the housing can be a three-column groove housing. The male part includes a rolling bearing, and the rolling bearing includes a plurality of rollers 11, which are inserted into the housing through the open end of the housing of the female part 2. The female part 2 can drive the male part to rotate at a constant speed, and the male part can also slide axially and swing angularly in the female part 2. When the male part slides relative to the female part 2, the rolling bearing of the male part rolls.
[0032] like Figures 1 to 3 As shown, the dust cover includes a main body 3, which includes a first open end 31, a corrugated cylinder 32, a connecting section 34 and a second open end 33 in sequence. The opening of the first open end 31 is smaller than the opening of the second open end 33. The second open end 33 of the dust cover is fixed on the mother part 2, and the first open end 31 of the dust cover is fixed on the mounting groove of the output shaft 1.
[0033] The dust cover also includes a limit block 4, which is arranged on the inner surface of the connecting section 34. When the male part moves to the extreme position close to the open end face of the female part 2, the dust cover is in a stretched state, the roller 11 is placed in the second open end 33 and the outer arc surface of the roller 11 is in contact with or close to the limit block 4. The limit block 4 prevents the roller 11 from detaching from the female part 2. The limit block 4 and the dust cover are integrally formed by injection molding and blow molding, which greatly reduces the weight of the dust cover and shortens the molding cycle time.
[0034] The inner wall of the second open end 33 of the dust cover is provided with a plurality of spaced protrusions 331, which divide the second open end 33 into a plurality of spaced recesses and protrusions. The shape of the second open end 33 is consistent with the shape of the outer wall of the open end of the mother part 2, such as Figure 1 As shown, the inner wall of the second open end 33 is provided with three recesses and three protrusions which are spaced apart from each other. The position of the connecting section 34 corresponding to the second open end 33 is also provided with a recess and a protrusion.
[0035] The stopper 4 includes at least two groups, each group of stopper 4 includes at least two stopper blocks, and at least two stopper blocks 4 are respectively arranged on the connecting section 34 of the concave portion. The stopper 4 has a surface that matches the arc surface of the outer ring of the roller 11, and the surface can be a plane or a curved surface. Figure 1 As shown, the limit blocks 4 include three groups, each group of limit blocks 4 includes two limit blocks 4, and the two limit blocks 4 are respectively arranged on the connecting section 34 at the junction of the concave part and the convex part. The thickness of the limit blocks 4 gradually decreases in the direction away from the corrugated cylinder 32, and the limit blocks 4 are wedge-shaped blocks.
[0036] The limit block 4 opposite to the above surface is provided with a reinforcing rib 41, and the reinforcing rib 41 includes at least one reinforcing rib, and the reinforcing rib 41 is fixedly connected to the inner wall of the connecting section 34. Figure 1 As shown, the dust cover includes two reinforcing ribs 41, which are parallel to each other and perpendicular to the plane connected to the limiting block 41. By providing the reinforcing ribs 41, the strength and rigidity of the limiting block 4 are enhanced.
[0037] When the second open end 33 is fixed to the open end of the mother component 2, the end face of the open end of the mother component 2 is in contact with or close to the reinforcing rib 41, so that the rigidity of the connecting section 34 of the dust cover and the second open end 33 is enhanced, and the connection between the dust cover and the mother component 2 is more firmly established.
[0038] like Figure 5 As shown, the axial length of the limit block 4 is greater than the axial length of the reinforcing rib 41. When the second open end 33 is fixed to the open end of the mother component 2, the end of the limit block 4 extends into the open end of the mother component 2, and the limit block 4 contacts or approaches the inner wall of the mother component 2. When the dust cover in the transmission assembly is in a stretched state, the roller 11 contacts the limit block 4, and the roller 11 presses the limit block 4, so that the limit block 4 presses the mother component 2, effectively preventing the roller 11 from detaching from the mother component 2.
[0039] The transmission assembly is capable of transmitting the rotational motion of the shaft of the gearbox to the wheel axle in the vehicle transmission. Figure 4-Figure 6As shown, the transmission assembly includes a female part 2 located at the end of the input shaft 21, a male part located at the end of the output shaft 1 and the above-mentioned dust cover, the female part 2 includes a housing, and the housing can be a three-column groove housing. The male part includes a rolling bearing, and the rolling bearing includes a plurality of rollers 11, which are suitable for being inserted into the housing through the open end of the housing of the female part 2. The female part 2 can drive the male part to rotate at a constant speed, and the male part can also slide axially and swing angularly in the female part 2. When the male part slides relative to the female part 2, the rolling bearing of the male part rolls, and the second open end 33 of the dust cover is fixed on the female part 2, and the first open end 31 of the dust cover is directly fixed on the mounting groove of the output shaft 1.
[0040] The rolling bearing of the male part includes a plurality of rollers 11, wherein the shape of the rollers 11 can be a wheel shape, and the number of rollers 11 can be 3, and the 3 rollers 11 are evenly distributed at intervals of 120° around the outer wall of the end of the output shaft 1. Each roller 11 has a front surface, a rear surface, and an outer peripheral surface interconnecting the front surface and the rear surface. The rear surface of the roller 11 is the surface of the roller 11 facing the output shaft 1. The structure of the roller 11 has been disclosed in the prior art and will not be repeated here.
[0041] When the input shaft 21 causes the female part 2 to rotate, this rotation is transmitted to the male part and the output shaft 1 through the rolling bearing, driving the output shaft 1 to rotate at a constant speed.
[0042] The housing of the mother component 2 includes cylindrical protrusions corresponding to the positions of the rollers 11 of the rolling bearing, and cylindrical recesses are provided between the adjacent cylindrical protrusions. If the rolling bearing includes three rollers 11, the housing correspondingly includes three cylindrical protrusions and three cylindrical recesses between the three cylindrical protrusions, also known as a three-column groove shell. The inner side wall of each cylindrical protrusion forms a track extending along the axial direction of the housing, and the cross-sectional shape of the track is an arc complementary to the generating line of the roller 11 generated by rotating around the central axis. In addition, the inner wall of the housing of the mother component 2 is determined according to the installation conditions of the roller 11.
[0043] The dust cover may be made of an elastomeric material, and the elastomeric material may include a thermoplastic elastomer (TPE), such as a thermoplastic polyester elastomer (TPEE).
[0044] A ridge 332 is circumferentially arranged on the inner wall of the second open end 33, and a mounting groove matching the ridge 332 is arranged on the outer wall of the open end of the mother component 2. During installation, the ridge 332 can be placed in the corresponding mounting groove, and the second open end 33 can be sleeved on the mounting groove of the open end of the mother component 2, and the reinforcing rib 41 is in contact with or close to the end face of the open end of the mother component 2.
[0045] A protrusion 333 is circumferentially arranged at the outer wall edge of the second open end 33, and the protrusion 333 includes at least three protrusions. An annular flange 334 is arranged on the outer wall of the second open end 33 connected to the corrugated cylinder 32. When the second open end 33 is fixed to the open end of the mother part 2, it is fixed by a clamp. The protrusion 333 and the flange 334 are arranged to effectively prevent the clamp from detaching.
[0046] A limiting edge is provided on the inner wall of the first open end 31, a limiting groove cooperating with the limiting edge is provided on the output shaft 1, a rib is provided along the circumferential direction at the edge of the outer wall of the first open end 31, the rib includes multiple sections, and the multiple sections of the rib are evenly distributed on the outer wall of the first open end 31, and the clamp is clamped on the outer wall of the first open end 31, so as to fix the first open end 31 on the output shaft 1. When the first open end 31 is fixed on the output shaft 1 by the clamp, the firmness and sealing performance are greatly improved.
[0047] The dust cover can effectively reduce the weight of the dust cover by directly setting the limit block 4 in the body. On the basis of the existing dust cover, an independent protrusion 333 is set on the outer wall of the second open end 33, which can also reduce the weight of the dust cover. At the same time, when the male part moves toward the open end of the female part 2, the outer ring surface of the roller 11 contacts the limit block 4. On the one hand, it prevents the roller 11 from detaching from the female part 2; on the other hand, the limit structure can play a good buffering role, and release the locking force or friction force in advance when the male part moves away from the open end of the female part 2. The axial length of the limit block 4 is longer than the axial length of the reinforcing rib 41. When the outer ring surface of the roller 11 contacts the limit block 4, the limit block 4 presses the female part 2 to effectively prevent the roller 11 from detaching. The transmission assembly has a simple structure, firm fixation, good sealing performance and long service life.
[0048] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.
Claims
1. A dust cover for an anti-slip type drive shaft universal joint, used on a transmission joint, the transmission joint comprising a female part (2) located at the end of an input shaft (21) and a male part located at the end of an output shaft (1), the female part (2) comprising a housing, the male part comprising a rolling bearing, the rolling bearing comprising a plurality of rollers (11), inserted into the housing through the open end of the housing of the female part (2); characterized in that: The dust cover comprises a main body (3), the main body (3) comprises a first open end (31), a corrugated cylinder (32), a connecting section (34) and a second open end (33) in sequence, the opening of the first open end (31) is smaller than the opening of the second open end (33), the first open end (31) of the dust cover is fixed on the output shaft (1), and the second open end (33) of the dust cover is fixed on the mother part (2); the dust cover also comprises a limit block (4) and a reinforcing rib (41) connected to the limit block (4), the limit The stopper (4) is arranged on the inner surface of the connecting section (34); when the dust cover is in a stretched state, the roller (11) is placed in the second open end (33) and the outer arc surface of the roller (11) contacts the stopper (4); the stopper (4) prevents the roller (11) from being separated from the mother part (2); the stopper (4) includes at least two groups, each group of the stopper (4) includes at least two stoppers; the inner wall of the connecting section (34) is provided with a plurality of recessed portions and convex portions distributed at intervals; the stopper (4) opposite to the surface A reinforcing rib (41) is provided, and the reinforcing rib (41) is fixedly connected to the inner wall of the connecting section (34); the axial length of the limit block (4) is greater than the axial length of the reinforcing rib (41); each group of limit blocks (4) is respectively provided on the connecting section (34) at the recessed portion, and the limit block (4) has a surface matching the arc surface of the outer ring of the roller (11); the thickness of the limit block (4) gradually decreases in a direction away from the corrugated cylinder (32), and the limit block (4) is a wedge-shaped block; the reinforcing rib (41) comprises at least one When the second open end (33) is fixed to the open end of the mother component (2), the end surface of the open end of the mother component (2) is in contact with or close to the reinforcing rib (41); when the second open end (33) is fixed to the open end of the mother component (2), the end of the limit block (4) extends into the open end of the mother component (2), and the limit block (4) is in contact with or close to the inner wall of the mother component (2); the limit block (4) includes two reinforcing ribs (41), and the two reinforcing ribs (41) are parallel to each other and perpendicular to the plane connected to the limit block (4).
2. A transmission assembly, characterized in that: It comprises a female component (2) located at the end of an input shaft (21), a male component located at the end of an output shaft (1) and a dust cover for an anti-slip type drive shaft universal joint as described in claim 1, wherein the female component (2) comprises a housing, the male component comprises a rolling bearing, the rolling bearing comprises a plurality of rollers (11) which are inserted into the housing through the open end of the housing of the female component (2), the first open end (31) of the dust cover is fixed to the output shaft (1), and the second open end (33) of the dust cover is fixed to the female component (2).
3. The transmission assembly according to claim 2, characterized in that: A protrusion (333) is circumferentially arranged at the outer wall edge of the second open end (33), and the protrusion (333) includes at least three protrusions. An annular flange (334) is arranged on the outer wall of the second open end (33) at the connection with the connecting section (34). When the second open end (33) is fixed to the open end of the mother component (2), it is fixed by a clamp, and the protrusion (333) and the flange (334) prevent the clamp from detaching.
4. The transmission assembly according to claim 2, characterized in that: The inner wall of the second open end (33) is provided with a ridge (332) along the circumferential direction, and the outer wall of the open end of the female component (2) is provided with a mounting groove matching the ridge (332).
5. The transmission assembly according to claim 2, characterized in that: The inner wall of the first open end (31) is provided with an annular limiting edge, a limiting groove cooperating with the limiting edge is provided on the output shaft (1), a plurality of retaining edges are provided along the circumferential direction at the outer wall edge of the first open end (31), and a clamp is clamped on the outer wall of the first open end (31).