Ball cage universal joint

Abstract

The utility model discloses a ball cage universal joint which comprises an input shaft, a steel ball, a starlike sleeve, a retainer and a bell housing, and further comprises a dustproof unit mounted on the bell housing; wherein the input shaft penetrates out of the dustproof unit; the dustproof unit comprises a dustproof cover which is installed at the opening end of the bell-shaped shell. The fixing part is fixedly connected to the top end of the dust cover and arranged on the input shaft in a sleeving mode; the sealing part is fixedly connected to the lower end of the equation cover; the inner wall of the bell housing extends to the outer wall of the bell housing; the fastening grooves are formed in the outer wall of the fixing part and the outer wall of the sealing part respectively; the pair of binding belts are installed in the fastening grooves respectively, in daily production and life, the opening end of the bell-shaped shell is covered by the dustproof cover, external impurities are effectively prevented from entering the universal joint, the dustproof effect is improved, and the service life of the universal joint is prolonged.

Description

Technical Field

[0001] The utility model relates to a constant velocity joint. Background Art

[0002] In a constant velocity joint of the ball cage type, the center of the inner spherical surface of the bell housing, the centers of the inner and outer spherical surfaces of the cage, and the center of the outer spherical surface of the star-shaped sleeve coincide at a common point. The disadvantage of this structure is that during the vehicle driving process, when the constant velocity joint swings to the limit angle, the inclusion area of the steel balls with the inner spherical surface of the bell housing and the inner and outer spherical surfaces of the star-shaped sleeve is too small, which easily leads to excessive wear of the steel balls and the ball tracks, and reduces the service life of the constant velocity joint.

[0003] Existing constant velocity joints for reducing wear, such as a constant velocity joint of the ball cage type with the patent number CN211623991U, include steel balls, a star-shaped sleeve, an eccentric cage and a bell housing. The inner raceway of the bell housing includes a first inner raceway and a second inner raceway with a smooth transition. The center of the spherical surface of the first inner raceway is eccentric to the left of the center of the steel ball placed therein, and the center of the spherical surface of the second inner raceway is eccentric to the right of the center of the steel ball placed therein. The outer raceway of the star-shaped sleeve includes a first outer raceway and a second outer raceway with a smooth transition. The center of the spherical surface of the first outer raceway is eccentric to the left of the center of the steel ball placed therein, and the center of the spherical surface of the second outer raceway is eccentric to the right of the center of the steel ball placed therein. In this way, when the constant velocity joint of the ball cage type swings at a large angle, the inclusion surface of the steel balls between the inner raceway of the bell housing and the outer raceway of the star-shaped sleeve will change crosswise, making the steel balls evenly stressed.

[0004] This embodiment can reduce the wear risk and increase the service life of the constant velocity joint of the ball cage type, but its existing defects are as follows:

[0005] 1. The constant velocity joint assembly is exposed outside, and debris, dust, acidic substances, etc. can enter the constant velocity joint; the constant velocity joint is prone to wear;

[0006] 2. The friction between components such as the cage and the star-shaped sleeve increases, the wear intensifies, and further reduces the service life of the constant velocity joint. Summary of the Invention

[0007] The utility model aims to solve one of the technical problems existing in the prior art.

[0008] This application provides a constant velocity joint of the ball cage type, which includes an input shaft, steel balls, a star-shaped sleeve, a cage and a bell housing, and further includes:

[0009] A dust-proof unit, which is installed on the bell housing;

[0010] Wherein, the input shaft passes through from the dust-proof unit.

[0011] The dust-proof unit includes:

[0012] A dust-proof cover, which is installed at the open end of the bell housing;

[0013] A fixing part, which is fixedly connected to the top end of the dust cover and sleeved on the input shaft;

[0014] A sealing part, which is fixedly connected to the lower end of the dust cover and extends to the outer wall of the bell housing;

[0015] A pair of fastening grooves, which are respectively arranged on the outer walls of the fixing part and the sealing part;

[0016] A pair of cable ties, which are respectively installed in each fastening groove.

[0017] It further includes:

[0018] An oil storage cavity, which is arranged in the dust cover;

[0019] An oil drain hole, which is arranged at the bottom end of the oil storage cavity and communicated to the inner cavity of the dust cover;

[0020] An oil filling assembly, which is arranged on the bell housing;

[0021] Wherein, the oil drain hole is communicated with the oil filling assembly.

[0022] It further includes:

[0023] A plurality of elastic push rods, which are respectively arranged outside the side wall of the oil storage cavity;

[0024] A fixing sleeve, whose outer end is fixedly connected to each elastic push rod;

[0025] Wherein, the fixing sleeve can be sleeved outside the output shaft.

[0026] The oil filling assembly includes:

[0027] An annular groove, which is arranged on the bell housing and communicated with the oil drain hole;

[0028] An oil inlet groove, which is arranged inside the bell housing and vertically connected to the annular groove;

[0029] Wherein, one side of the oil inlet groove is communicated to the inner cavity of the bell housing.

[0030] It further includes:

[0031] A limit block, which is arranged in the oil inlet groove;

[0032] A T-shaped groove, which is arranged on the limit block;

[0033] A check valve rod, which is slidably installed in the oil inlet groove;

[0034] Wherein, one end of the check valve rod extends beyond the inner wall of the bell groove.

[0035] It further includes:

[0036] A chute, which is arranged on the inner wall of the annular groove and corresponds to the position of the oil inlet groove;

[0037] A sliding block, which is slidably installed in the chute and fixedly connected to the check valve rod at the lower end;

[0038] A sealing block, which is fixedly connected to the check valve rod;

[0039] A damping spring, which is fixedly connected between the chute and the sliding block;

[0040] Wherein, the sealing block is installed in the T-shaped groove.

[0041] The beneficial effects of the present utility model are as follows:

[0042] 1. Through the arrangement of the dust-proof cover, the open end of the bell housing is covered, effectively preventing foreign impurities from entering the universal joint, improving the dust-proof effect and prolonging the service life of the universal joint;

[0043] 2. Through the arrangement of the oil storage cavity, the oil discharge hole and the oil filling assembly, during the operation of the universal joint, the lubricating oil in the oil storage cavity sequentially enters the inner cavity of the bell housing along the oil discharge hole, the annular groove and the oil inlet groove. The lubricating oil lubricates the inside of the bell housing and the internal parts, reduces the friction between the internal parts of the universal joint, and prolongs the service life of the universal joint. Description of the Drawings

[0044] Figure 1 It is a schematic structural diagram of a constant velocity joint in an embodiment of the present application

[0045] Figure 2 For this Figure 1 It is a partially enlarged schematic view of the structure at A in the figure;

[0046] Figure 3 It is a schematic connection diagram of the fixing sleeve and the elastic push rod in an embodiment of the present application.

[0047] Reference Numerals

[0048] 1 - input shaft, 2 - steel ball, 3 - star-shaped sleeve, 4 - cage, 5 - bell housing, 6 - dust-proof unit, 7 - dust-proof cover, 701 - fixing part, 702 - sealing part, 703 - fastening groove, 704 - tie strap, 8 - oil storage cavity, 9 - oil discharge hole, 10 - oil filling assembly, 11 - elastic push rod, 12 - fixing sleeve, 13 - annular groove, 14 - oil inlet groove, 15 - limiting block, 16 - T-shaped groove, 17 - check valve rod, 18 - chute, 19 - sliding block, 20 - sealing block, 21 - damping spring. Detailed Embodiments

[0049] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0050] The terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same category, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally means that the related objects before and after are in an "or" relationship.

[0051] Next, the servo provided in the embodiments of the present application will be described in detail with reference to the accompanying drawings through specific embodiments and their application scenarios.

[0052] Embodiment 1:

[0053] As Figure 1 shown, the embodiment of the present application provides a constant velocity joint, which includes an input shaft 1, steel balls 2, a star-shaped sleeve 3, a cage 4, and a bell housing 5, and further includes: a dust-proof unit 6, which is installed on the bell housing 5; wherein, the input shaft 1 passes through from the dust-proof unit 6.

[0054] Furthermore, the dust-proof unit 6 includes a dust-proof cover 7, which is installed at the open end of the bell housing 5; a fixing part 701, which is fixedly connected to the top end of the dust-proof cover 7 and sleeved on the input shaft 1; a sealing part 702, which is fixedly connected to the lower end of the dust-proof cover and extends to the outer wall of the bell housing 5; a pair of fastening grooves 703, which are respectively arranged on the outer walls of the fixing part 701 and the sealing part 702; and a pair of cable ties 704, which are respectively installed in the fastening grooves 703.

[0055] In this embodiment of the present application, due to the adoption of the above structure, it is necessary to prevent foreign debris, dust, acidic substances, etc. from entering the universal joint. The dust cover 7 can be sleeved on the input shaft 1, and the sealing part 702 can be wrapped around the outer wall of the bell housing 5. The inner wall of the fixing part 701 fits against the outer wall of the input shaft 1, and they are respectively tied tightly in the fastening grooves 703 of the fixing part 701 and the sealing part 702 using cable ties 704 to ensure the sealing performance of the dust cover 7. The dust cover 7 is generally installed at the open end of the bell housing 5. During the operation of the universal joint, the dust cover 7 will be stretched, which may cause damage. By locking the extended sealing part 702 of the dust cover 7 to the outer wall of the bell housing 5, the stretching range of the dust cover 7 is increased, reducing damage and improving the service life of the dust cover 7.

[0056] Embodiment 2:

[0057] As Figures 1 to 3 shown, in this embodiment, in addition to including the structural features of the foregoing embodiment, it further includes: an oil storage cavity 8, which is arranged inside the dust cover 7; an oil drain hole 9, which is arranged at the bottom end of the oil storage cavity 8 and communicates with the inner cavity of the dust cover 7; an oil filling assembly 10, which is arranged on the bell housing 5; wherein, the oil drain hole 9 communicates with the oil filling assembly 10.

[0058] Furthermore, it further includes a plurality of elastic push rods 11, which are respectively arranged outside the side wall of the oil storage cavity 8; a fixing sleeve 12, whose outer end is fixedly connected to each elastic push rod 11; wherein, the fixing sleeve 12 can be sleeved outside the output shaft.

[0059] Furthermore, the oil filling assembly 10 includes an annular groove 13, which is arranged on the bell housing 5 and communicates with the oil drain hole 9; an oil inlet groove 14, which is arranged inside the bell housing 5 and is vertically connected to the annular groove 13; wherein, one side of the oil inlet groove 14 communicates with the inner cavity of the bell housing 5.

[0060] Furthermore, it further includes a limit block 15, which is arranged inside the oil inlet groove 14; a T-shaped groove 16, which is arranged on the limit block 15; a check valve rod 17, which is slidably installed inside the oil inlet groove 14; wherein, one end of the check valve rod 17 extends beyond the inner wall of the bell groove.

[0061] Furthermore, it further includes a sliding groove 18, which is arranged on the inner wall of the annular groove 13 and corresponds to the position of the oil inlet groove 14; a sliding block 19, which is slidably installed inside the sliding groove 18, and its lower end is fixedly connected to the check valve rod 17; a sealing block 20, which is fixedly connected to the check valve rod 17; a damping spring 21, which is fixedly connected between the sliding groove 18 and the sliding block 19; wherein, the sealing block 20 is installed inside the T-shaped groove 16.

[0062] In this embodiment of the present application, due to the adoption of the above structure, during the operation of the universal joint, the contact surfaces between the bell housing, the cage 4, the spider 3, and the balls 2 are all prone to wear, which will reduce the service life of the universal joint. Therefore, it is necessary to add lubricating oil into the universal joint to reduce friction. The lubricating oil is added into the oil storage cavity 8 of the dust cover 7 through the oil injection hole. When the universal joint is operating, the input shaft 1 swings, and the dust cover 7 is stretched and deformed. The inner wall of the dust cover presses the elastic push rod 11, and the elastic push rod 11 squeezes the lubricating oil in the oil storage cavity 8. The lubricating oil enters the annular groove 13 from the oil drain hole 9. During the operation of the universal joint, the balls 2 roll on the inner wall of the bell housing. When the balls roll, they squeeze the check rod 17, and the check rod 17 moves along the oil inlet groove 14. At the same time, the sliding block 19 moves along the sliding groove 18, and the damping spring 21 is compressed. The sealing block 20 disengages from the T-shaped groove 16. At this time, there is a gap between the T-shaped groove 16 and the check rod. The lubricating oil in the annular groove 13 enters the inner cavity of the bell housing 5 from the oil inlet groove 14, thereby lubricating the inside of the universal joint, reducing the friction between various parts, and improving the service life of the universal joint. When the balls 2 do not squeeze the check rod 17, the damping spring 21 resets and pushes the sliding block 19 to move along the outside of the sliding groove 18. The sliding block 19 pushes the check rod 17 to move, so that the sealing block 20 is installed in the T-shaped groove 16, thereby playing a sealing role and preventing the lubricating oil in the inner cavity of the bell housing 5 from flowing back into the annular groove 13.

[0063] It should be noted that in this article, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0064] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative rather than restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. A ball cage universal joint, comprising an input shaft (1), a steel ball (2), a star sleeve (3), a retaining frame (4) and a bell housing (5), characterized in that: Also includes: A dustproof unit (6) mounted on the bell housing (5); Wherein, the input shaft (1) passes through the dustproof unit (6).

2. A ball cage universal joint according to claim 1, characterized in that: The dustproof unit (6) comprises: A dust cover (7) mounted on the open end of the bell housing (5); A fixing portion (701) fixedly connected to the top end of the dust cover (7) and sleeved on the input shaft (1); A sealing portion (702) fixedly connected to the lower end of the dust cover and extending to the outer wall of the bell housing (5); A pair of fastening grooves (703) respectively arranged on the outer walls of the fixing portion (701) and the sealing portion (702); A pair of cable ties (704) are respectively installed in each of the fastening grooves (703).

3. A ball cage universal joint according to claim 2, characterized in that: Also includes: An oil storage chamber (8) disposed inside the dust cover (7); An oil drain hole (9) is arranged at the bottom end of the oil storage cavity (8) and is connected to the inner cavity of the dust cover (7); A refueling assembly (10) disposed on the bell housing (5); Wherein, the oil drain hole (9) is connected to the oil filling assembly (10).

4. A ball cage universal joint according to claim 3, characterized in that: Also includes: A plurality of elastic push rods (11) are respectively arranged outside the side walls of the oil storage chamber (8); A fixed sleeve (12), the outer end of which is fixedly connected to each of the elastic push rods (11); Wherein, the fixing sleeve (12) can be sleeved outside the output shaft.

5. A ball cage universal joint according to claim 3, characterized in that: The refueling assembly (10) comprises: an annular groove (13), which is arranged on the bell housing (5) and communicates with the oil drain hole (9); An oil inlet groove (14) is arranged in the bell housing (5) and vertically connected to the annular groove (13); One side of the oil inlet groove (14) is connected to the inner cavity of the bell housing (5).

6. A ball cage universal joint according to claim 5, characterized in that: Also includes: A limit block (15) disposed in the oil inlet groove (14); A T-shaped groove (16) provided on the limiting block (15); a check rod (17) slidably mounted in the oil inlet groove (14); Wherein, one end of the check rod (17) exceeds the inner wall of the bell-shaped groove.

7. A ball cage universal joint according to claim 6, characterized in that: Also includes: A slide groove (18) is arranged on the inner wall of the annular groove (13) and corresponds to the position of the oil inlet groove (14); A sliding block (19) is slidably mounted in the sliding groove (18), and the lower end of the sliding block is fixedly connected to the check rod (17); A sealing block (20) fixedly connected to the check rod (17); A damping spring (21) fixedly connected between the slide groove (18) and the sliding block (19); Wherein, the sealing block (20) is installed in the T-shaped groove (16).

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