Dust cover

Abstract

The utility model provides a dust cover which comprises a dust cover body arranged on a universal joint in a sleeved mode, one end of the dust cover body is provided with a first opening end, the other end of the dust cover body is provided with a second opening end, and the first opening end is smaller than the second opening end. Three groups of blocking pieces are fixedly arranged in the second opening end and are uniformly distributed in the circumferential direction of the dust cover main body, and each group of blocking pieces is in abutting and limiting fit with the male piece; each group of stoppers comprises two first limiting blocks and a second limiting block, and the second limiting block and the two first limiting blocks are fixedly connected with the dust cover main body through a reinforcing rib; the ends, close to the female part, of the second limiting block and the two first limiting blocks are provided with limiting slopes. The first limiting block is in abutting limiting fit with the roller of the male piece, and the second limiting block is in abutting limiting fit with the three-fork shaft of the male piece. And through the arrangement of the second limiting piece, the end part of the tripod shaft can be prevented from being separated from the interior of the shell, and subsequent normal use of the tripod joint is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of universal joint dust cover, and specifically relates to a dust cover. BACKGROUND

[0002] The universal joint is a machine part for realizing variable-angle power transmission, the constant-velocity universal joint comprises a female part at the end of an input shaft and a male part at the end of an output shaft, the female part at the end of the input shaft comprises a shell, the male part at the end of the output shaft comprises a rolling bearing, the rolling bearing comprises a three-pronged shaft and a roller, and the rolling bearing is adapted to be inserted into the shell via the open end of the shell of the female part. Power is transmitted from an engine or a motor to a gear transmission box, transmitted to the input shaft and the female part through the gear transmission box, and transmitted to the male part by the female part, and the female part and the male part rotate at a constant speed. The male part can also axially slide and angularly move in the female part, and when the male part slides relative to the female part, the rolling bearing of the male part rolls.

[0003] In order to increase the service life of the universal joint, a dust cover is usually installed to reduce the influence of the external environment, and after the dust cover is sleeved on the driving shaft universal joint, one open end of the dust cover is sleeved on the output shaft, and the other open end is sleeved on the open end of the female part shell. Most of the existing dust covers limit the rollers, but do not directly limit the three-pronged shaft, which may cause the end of the three-pronged shaft to be separated from the track inside the shell, and the end of the three-pronged shaft may be hindered by the shell wall when it slides out of the shell, thereby affecting the normal use of the subsequent universal joint.

[0004] The patent with the publication number CN211175095U discloses a dust cover for preventing the driving shaft universal joint from being separated and a transmission assembly, the transmission joint comprises a female part at the end of an input shaft and a male part at the end of an output shaft, the female part comprises a shell, the male part comprises a rolling bearing, the rolling bearing comprises a plurality of rollers, and is inserted into the shell via the open end of the shell of the female part; the dust cover comprises a main body, the main body comprises a connecting segment, and a limiting block is fixedly arranged on the connecting segment; when the dust cover is in a stretched state, the outer arc surface of the roller is in contact with the limiting block, and the limiting block is used for preventing the roller from being separated from the female part shell.

[0005] In the above-mentioned scheme, the roller will extrude the limiting block during the sliding process towards the open end surface of the female part, so that the limiting block is offset and extruded from the female part, thereby avoiding the separation of the roller and the female part. However, the above-mentioned scheme can only limit the roller by the limiting block, and cannot limit the three-pronged shaft, so there is a probability that the shaft end of the three-pronged shaft will slide out of the female part. When the end of the three-pronged shaft slides out of the female part, the side wall of the female part will hinder the end of the three-pronged shaft from returning to the female part, thereby affecting the normal use of the subsequent universal joint. UTILITY MODEL CONTENTS

[0006] To solve the problems in the background art, the utility model provides a dust cover.

[0007] In order to achieve the above-mentioned purpose, the utility model provides technical schemes as follows:

[0008] A dust cover, including the dust cover main part of the universal joint, the first opening end is set in the dust cover main part, the second opening end is set in the other end, the first opening end is smaller than the second opening end, three groups of fender are fixed in the second opening end, three groups of fender are evenly distributed along the circumference of the dust cover main part, and each group of fender is in abutting stop cooperation with the male part, each group of fender includes two first limit blocks and a second limit block, the second limit block and the two first limit blocks are fixedly connected with the dust cover main part through a reinforcing rib, the second limit block is located between the two first limit blocks, and the end part close to the female part of the second limit block and the two first limit blocks is provided with a limit inclined surface, the first limit block is in abutting stop cooperation with the roller of the male part through the limit inclined surface, and the second limit block is in abutting stop cooperation with the three-pronged shaft of the male part through the limit inclined surface.

[0009] Further, the end of the housing of the female part of the universal joint is connected with the input shaft without connecting the dust cover main part, and the three-pronged shaft of the male part of the universal joint is connected with the output shaft.

[0010] Further, the three end parts of the three-pronged shaft are provided with arc end parts, the arc end parts are in sliding cooperation with the limit inclined surface of the second limit block, and the limit inclined surface of the first limit block is in sliding cooperation with the arc surface of the roller.

[0011] Further, the inner wall of the second opening end of the dust cover main part is fixedly provided with three protruding parts arranged at intervals, the protruding parts divide the second opening end into three recessed parts arranged at intervals, the second limit block corresponds to the recessed part one by one, each second limit block is located in the corresponding recessed part, two first limit blocks are arranged on each protruding part, and the two first limit blocks in the same group of fender are located on the protruding parts on the two sides of the recessed part where the second limit block in the group of fender is located; the recessed part corresponds to the three rollers on the three-pronged shaft one by one, and each roller is in limit sliding cooperation with the corresponding recessed part.

[0012] The application has the following beneficial effects:

[0013] 1. The first limit part can limit the roller, so that the roller is prevented from separating from the housing. Meanwhile, the second limit part is arranged to prevent the end part of the three-pronged shaft from separating from the housing, avoid the situation that the end part of the three-pronged shaft cannot return to the housing, and ensure the normal use of the three-pronged joint in the future.

[0014] 2. The first limiting piece and the second limiting piece limit the resistance of the trident shaft and the roller in the process of sliding towards the outside of the shell, and the roller and the first limiting piece and the trident shaft and the second limiting piece are more and more tightly clamped, so that the trident shaft and the roller are locked and positioned, and the trident shaft and the roller are prevented from separating from the open end of the shell. BRIEF DESCRIPTION OF DRAWINGS

[0015] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description read in conjunction with the accompanying drawings. In the drawings, several embodiments of the present application are illustrated by way of example and not limitation. Like or corresponding reference numerals in the drawings and description denote like or corresponding parts.

[0016] Figure 1 is a three-dimensional structure schematic diagram of the present application;

[0017] Figure 2 is a schematic diagram of the internal structure of the shell and the protective cover main body of the present application;

[0018] Figure 3 is a schematic diagram of the protective cover main body structure of the present application;

[0019] Figure 4 is a schematic diagram of the position relationship structure of the first limiting block and the second limiting block of the present application;

[0020] Figure 5 is a schematic diagram of the position relationship structure of the trident shaft and the roller of the present application.

[0021] Explanation of reference signs:

[0022] 1, shell; 11, input shaft; 2, dust cover main body; 21, corrugated cylinder; 22, first open end; 23, second open end; 3, first limiting block; 4, second limiting block; 5, reinforcing rib; 6, protruding part; 7, recessed part; 8, trident shaft; 81, curved surface end; 9, roller. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Those skilled in the art should know that the embodiments described below are only part of the embodiments of the present disclosure, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0024] As Figures 1-5As shown, the technical solution adopted by this utility model is as follows: A dust cover includes a dust cover body 2 sleeved on a universal joint. The universal joint includes a female component located at the end of the input shaft 11 and a male component located at the end of the output shaft (not shown in the figure). The female component includes a housing 1, which may be a three-column groove housing. The male component includes a rolling bearing, which includes a three-pronged shaft 8 and a roller 9, inserted into the housing 1 through the open end of the housing 1 of the female component. The input shaft 11 drives the female component to rotate, and the female component drives the male component to rotate at the same speed. The male component can also slide axially and make angular movements within the housing 1 of the female component, thereby driving the output shaft to rotate at the same speed.

[0025] The dust cover body 2 includes a conical corrugated cylinder 21. One end of the corrugated cylinder 21 has a first opening 22, and the other end has a second opening 23. The opening of the first opening 22 is smaller than the opening of the second opening 23. The second opening 23 is fixedly connected to the opening end of the housing 1, and the first opening 22 is fixedly connected to the output shaft (not shown in the figure) of a universal joint. One end of the output shaft is connected to a three-pronged shaft 8, and the end of the output shaft with the three-pronged shaft 8 is inserted into the opening end of the housing 1. Figure 5 As shown, rollers 9 are provided at all three ends of the three-pronged shaft 8, and all three ends of the three-pronged shaft 8 are arc-shaped ends 81.

[0026] like Figure 4 As shown, three spaced protrusions 6 are fixedly provided on the inner wall of the second opening end 23 of the dust cover body 2, which divide the second opening end 23 into three spaced recesses 7. The recesses 7 correspond one-to-one with the three rollers 9 on the triangular shaft 8, and each roller 9 slides in the corresponding recess 7.

[0027] Meanwhile, each recess 7 is provided with a set of stops between it and its two adjacent protrusions 6. There are three sets of stops in total, and each set of stops abuts and limits the movement of the universal joint. Each set of stops includes two first limiting blocks 3 and one second limiting block 4. The second limiting block 4 and the two first limiting blocks 3 are fixedly connected to the inner wall of the dust cover body 2 by a reinforcing rib 5. The second limiting block 4 is located in the recess 7, and the two first limiting blocks 3 in the same set as the second limiting block 4 are fixedly located on the protrusions 6 on both sides of the recess 7.

[0028] Both the first limiting block 3 and the second limiting block 4 have limiting inclined surfaces at their ends near the housing 1. The first limiting block 3 abuts against the arc-shaped surface of the roller 9 of the universal joint component through the limiting inclined surface, and the second limiting block 4 abuts against the arc-shaped end 81 of the three-pronged shaft 8 of the universal joint component through the limiting inclined surface.

[0029] Working principle: The input shaft 11 can drive the output shaft to rotate at a constant speed through the cooperation of the housing 1 and the three-pronged shaft 8. During the rotation of the output shaft, the roller 9 will roll axially and swing within the housing 1.

[0030] When the three-pronged shaft 8 moves to the limit position of the open end of the shell 1, the dust cover body 2 is in a stretched state, and the roller 9 gradually enters the second opening end 23. The arc surface end 81 of the three-pronged shaft 8 will be in contact with the limiting inclined surface of the second limiting block 4, and the second limiting block 4 will hinder the three-pronged shaft 8. At the same time, the limiting inclined surface of the first limiting block 3 will be in contact with the arc surface of the roller 9, and the first limiting block 3 will hinder the roller 9, thereby avoiding the roller 9 from sliding out.

[0031] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A dust cover, comprising a dust cover body (2) sleeved on a universal joint, a first open end (22) is formed at one end of the dust cover body (2), a second open end (23) is formed at the other end of the dust cover body (2), the first open end (22) is smaller than the second open end (23); characterized in that: Three groups of stop pieces are fixedly arranged in the second open end (23), and are evenly distributed along the circumference of the dust cover body (2), each group of stop pieces is in abutting and limiting cooperation with the male part; each group of stop pieces comprises two first limiting blocks (3) and one second limiting block (4), the second limiting block (4) and the two first limiting blocks (3) are fixedly connected with the dust cover body (2) through a reinforcing rib (5); the second limiting block (4) is located between the two first limiting blocks (3), and the end portions of the second limiting block (4) and the two first limiting blocks (3) close to the female part are each provided with a limiting inclined surface; the first limiting block (3) is in abutting and limiting cooperation with the roller (9) of the male part through the limiting inclined surface, and the second limiting block (4) is in abutting and limiting cooperation with the three-pronged shaft (8) of the male part through the limiting inclined surface.

2. The dust cover of claim 1, wherein One end of the shell (1) of the female part of the universal joint is connected with the input shaft (11) without connecting the dust cover body (2), and the three-pronged shaft (8) of the male part of the universal joint is connected with the output shaft.

3. The dust cover of claim 1, wherein, The three end portions of the three-pronged shaft (8) are each provided with an arc surface end (81), the arc surface end (81) is in sliding cooperation with the limiting inclined surface of the second limiting block (4), and the limiting inclined surface of the first limiting block (3) is in sliding cooperation with the arc surface of the roller (9).

4. The dust cover of claim 1, wherein Three spaced convex portions (6) are fixedly arranged on the inner wall of the second open end (23) of the dust cover body (2), the convex portions (6) divide the second open end (23) into three spaced recessed portions (7), the second limiting block (4) corresponds to the recessed portion (7) in one-to-one correspondence, each second limiting block (4) is located in the corresponding recessed portion (7), and each convex portion (6) is provided with two first limiting blocks (3), the two first limiting blocks (3) in the same group of stop pieces are located on the convex portions (6) on the two sides of the recessed portion (7) where the second limiting block (4) in the group of stop pieces is located; the recessed portion (7) corresponds to the three rollers (9) on the three-pronged shaft (8) in one-to-one correspondence, and each roller (9) is in limiting and sliding cooperation with the corresponding recessed portion (7).

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