Bearing bowl, low-friction-torque needle bearing and universal joint

Abstract

The utility model discloses a bearing bowl, low friction torque needle bearing and cardan universal joint, wherein the bearing bowl comprises a bearing bowl body, the groove bottom of the bearing bowl body is recessed to form a lubricating grease accumulation groove, and the lubricating grease accumulation groove is composed of a plurality of long linear grooves and a plurality of short linear grooves. A lubricating grease accumulation groove is redesigned and is formed by combining a plurality of long linear grooves and a plurality of short linear grooves, so that a larger amount of lubricating grease can be filled in the lubricating grease accumulation groove, the lubricating effect is improved, the long linear grooves and the short linear grooves extend in the radial direction, and the lubricating effect is improved. Compared with the prior art, the lubricating grease accumulation groove is better matched with the running fit of the corresponding shaft of the cross shaft, the problem that the lubricating grease is consumed too fast is not prone to occurring, the lubrication failure time is greatly prolonged, the lubrication durability is greatly improved, meanwhile, the structure around the lubricating grease accumulation groove can reliably support the end face of the corresponding shaft of the cross shaft, and the running fit reliability is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of needle roller bearings, in particular to a bearing bowl, a low-friction torque needle roller bearing and a cross-axis universal joint. Background Art

[0002] The steering intermediate shaft of passenger cars is one of the core components of the electric power steering system. As the OEMs have higher and higher requirements for the process parameters of the electric power steering system, the friction torque requirements for the universal joint at the lower shaft of the steering intermediate shaft are getting smaller and smaller.

[0003] However, due to structural design problems, the amount of grease filled in existing needle roller bearings is very limited. Figure 1 The existing needle roller bearings, especially at the bottom of the groove of the bearing bowl, usually use an array of small pits a to deposit grease. Not only is the grease storage capacity very small, the lubrication effect is not ideal, resulting in the friction torque failing to meet the application requirements of the OEM, but the lubrication fails very quickly and the lubrication durability is poor.

[0004] Solving the above problems has become a top priority. Utility Model Content

[0005] In order to solve the technical problems that the existing needle roller bearings have poor lubrication effect on the outer end surfaces of the four shafts of the cross shaft and poor lubrication durability, the utility model provides a bearing bowl, a low friction torque needle roller bearing and a cross shaft universal joint.

[0006] The technical solution is as follows:

[0007] The first aspect of the present application relates to a bearing bowl, comprising a bearing bowl body, the bearing bowl body being a circular groove-shaped structure with one end open, a circle of needle roller mounting ring groove being recessed on the circumferential groove wall of the bearing bowl body, a grease accumulation groove being recessed at the groove bottom of the bearing bowl body, the grease accumulation groove being composed of a plurality of long linear grooves and a plurality of short linear grooves, the long linear grooves and the short linear grooves being both linear groove structures, and the length of the long linear grooves being greater than the length of the short linear grooves, each of the long linear grooves and each of the short linear grooves extending radially along the groove bottom of the bearing bowl body, and the inner end of each of the long linear grooves extending to the center point of the groove bottom of the bearing bowl body, and a short linear groove being arranged between any adjacent long linear grooves.

[0008] By adopting the above bearing bowl, the grease accumulation groove is redesigned and designed to be a combination of multiple long linear grooves and multiple short linear grooves. Therefore, not only can a larger amount of grease be filled in the grease accumulation groove, thereby improving the lubrication effect, but also the long linear grooves and the short linear grooves both extend radially, which are better adapted to the rotational cooperation of the corresponding shaft of the cross shaft, and the problem of excessive grease consumption is less likely to occur, thereby greatly extending the time of lubrication failure and greatly improving the lubrication durability. At the same time, the structure around the grease accumulation groove can reliably support the end face of the corresponding shaft of the cross shaft, thereby ensuring the reliability of rotational cooperation.

[0009] In some embodiments, each long linear groove is evenly distributed along the center point of the groove bottom of the bearing bowl body, and each short linear groove is evenly distributed along the center point of the groove bottom of the bearing bowl body.

[0010] In some embodiments, each short linear groove is located at a center line between two adjacent long linear grooves.

[0011] In some embodiments, the distance between the outer end of each long linear groove and the center point of the groove bottom of the bearing bowl body is equal to the distance between the outer end of each short linear groove and the center point of the groove bottom of the bearing bowl body.

[0012] In some embodiments, the distances between the inner ends of the short linear grooves and the center point of the groove bottom of the bearing bowl body are equal.

[0013] In some embodiments, a center point groove is formed at the center point of the bottom of the bearing bowl body. The center point groove is a circular groove structure, and the inner end of each long linear groove extends to the center point groove.

[0014] In some embodiments, a shaft supporting boss is protruded from the center of the bottom of the groove of the bearing bowl body, and the grease accumulation groove is concavely formed on the end surface of the shaft supporting boss.

[0015] The second aspect of the present application relates to a low-friction torque needle roller bearing, comprising the above-mentioned bearing bowl and a plurality of needle rollers adapted to the needle roller mounting ring groove, wherein each needle roller is rotatably mounted side by side in a circular shape in the needle roller mounting ring groove, and the rotation axes of each needle roller are parallel to each other and evenly distributed around the rotation axis of the bearing bowl body.

[0016] The above-mentioned low-friction torque needle roller bearing is adopted, not only the grease accumulation groove is redesigned, the grease accumulation groove is designed to be composed of multiple long linear grooves and multiple short linear grooves, so that a larger amount of grease can be filled in the grease accumulation groove, thereby improving the lubrication effect, and at the same time, the long linear grooves and the short linear grooves both extend radially, which are better adapted to the rotation cooperation of the corresponding shaft of the cross shaft, and the problem of excessive grease consumption is not easy to occur, thereby greatly extending the time of lubrication failure and greatly improving the lubrication durability; and each needle roller is installed in the needle roller mounting ring groove, which can not only reliably limit each needle roller through the needle roller mounting ring groove, but also enable a large amount of grease to be filled in the needle roller mounting ring groove, thereby having a good lubrication effect on the corresponding shaft of the cross shaft and each needle roller.

[0017] The third aspect of the present application relates to a cross-axis universal joint, comprising a cross-axis, two yokes matched with the cross-axis and the above-mentioned low-friction torque needle bearing, wherein the four shafts of the cross-axis arranged in a cross are respectively embedded in the bearing bowl bodies of the corresponding low-friction torque needle bearings, and can be rotatably supported on the respective needles of the corresponding low-friction torque needle bearings, the needle roller mounting ring groove and the grease accumulation groove of each low-friction torque needle bearing are filled with grease, and the two yoke arms of the yoke are provided with bearing mounting holes matched with the bearing bowl bodies, the four bearing mounting holes are arranged in a cross, and the bearing bowl bodies of the four low-friction torque needle bearings are respectively embedded in the corresponding bearing mounting holes with interference fit.

[0018] By adopting the above cross-axis universal joint and filling the newly designed grease accumulation groove with grease, the friction torque between the four shafts of the cross-axis and the corresponding low-friction torque needle bearings can be greatly reduced, thereby meeting the application requirements of the main engine manufacturer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a needle roller bearing in the prior art;

[0020] Figure 2 It is a structural schematic diagram of the bearing bowl of the utility model;

[0021] Figure 3 It is a structural schematic diagram of the needle roller bearing of the utility model;

[0022] Figure 4 It is a structural schematic diagram of the cross-axis universal joint of the utility model;

[0023] Figure 5 It is a structural schematic diagram of the yoke of the utility model;

[0024] Figure 6 It is a schematic diagram of the matching relationship between the cross shaft and four needle roller bearings of the utility model. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with embodiments and drawings.

[0026] Embodiment 1:

[0027] like Figure 2 As shown, a bearing bowl mainly includes a bearing bowl body 1, which is a circular groove structure with one end open, that is, the bearing bowl body 1 is also a bowl-shaped structure. A circle of needle roller mounting ring groove 11 is formed on the circumferential groove wall of the bearing bowl body 1, that is, a circle of needle roller mounting ring groove 11 is provided on the circumferential inner wall of the bearing bowl body 1, and the needle roller mounting ring groove 11 is used to mount the needle roller 2.

[0028] In this embodiment, the groove bottom of the bearing bowl body 1 is recessed to form a grease accumulation groove 13, and the grease accumulation groove 13 can retain the filled grease, thereby achieving a good lubricating effect on the end face of the corresponding shaft of the cross shaft 3.

[0029] Specifically, the grease accumulation groove 13 is composed of a plurality of long linear grooves 131 and a plurality of short linear grooves 132. Both the long linear grooves 131 and the short linear grooves 132 are linear groove structures, and the length of the long linear grooves 131 is greater than the length of the short linear grooves 132. At the same time, each long linear groove 131 and each short linear groove 132 extend along the radial direction of the groove bottom of the bearing bowl body 1, and the inner end of each long linear groove 131 extends to the center point of the groove bottom of the bearing bowl body 1, that is, the inner end of each long linear groove 131 intersects at the center point of the groove bottom of the bearing bowl body 1. A short linear groove 132 is provided between any adjacent long linear grooves 131.

[0030] Therefore, the present embodiment redesigns the grease accumulation groove 13, and designs the grease accumulation groove 13 to be composed of a plurality of long linear grooves 131 and a plurality of short linear grooves 132, so that not only a larger amount of grease can be filled into the grease accumulation groove 13, thereby improving the lubrication effect, but also the long linear grooves 131 and the short linear grooves 132 both extend radially, which are better adapted to the end face rotation cooperation of the corresponding shaft of the cross shaft 3, and the problem of excessive grease consumption is less likely to occur, thereby greatly extending the time of lubrication failure and greatly improving the lubrication durability. At the same time, the structure around the grease accumulation groove 13 can reliably support the end face of the corresponding shaft of the cross shaft, thereby ensuring the reliability of rotation cooperation.

[0031] Furthermore, each long linear groove 131 is evenly distributed along the center point of the groove bottom of the bearing bowl body 1, and each short linear groove 132 is evenly distributed along the center point of the groove bottom of the bearing bowl body 1, so that the grease in each long linear groove 131 and each short linear groove 132 can act more evenly on the end face of the corresponding shaft of the cross shaft 3, thereby improving the lubrication effect.

[0032] Furthermore, each short linear groove 132 is located at the center line position between two adjacent long linear grooves 131, that is, any point of each short linear groove 132 is equidistant from the two adjacent long linear grooves 131 in the circumferential direction, so that the grease can act more evenly on the end face of the corresponding shaft of the cross shaft 3, further improving the lubrication effect.

[0033] Furthermore, the distance between the outer end of each long linear groove 131 and the center point of the groove bottom of the bearing bowl body 1 is equal to the distance between the outer end of each short linear groove 132 and the center point of the groove bottom of the bearing bowl body 1, so that the length of each short linear groove 132 is as long as possible, further increasing the effective area of ​​grease, thereby improving the lubrication effect on the end face of the corresponding shaft of the cross shaft 3.

[0034] Furthermore, the distances between the inner ends of the short linear grooves 132 and the center points of the groove bottoms of the bearing bowl body 1 are equal, so that the grease can act more evenly on the end faces of the corresponding shafts of the cross shaft 3, further improving the lubrication effect.

[0035] In this embodiment, eight long linear grooves 131 and eight short linear grooves 132 are provided, taking into account both the difficulty of processing and the filling amount of grease.

[0036] In the present embodiment, a center point groove 133 is formed at the center point of the groove bottom of the bearing bowl body 1. The center point groove 133 is a circular groove structure, and the inner end of each long linear groove 131 extends to the center point groove 133. Therefore, by adding the center point groove 133, more grease can be filled to improve the lubrication effect on the end face of the corresponding shaft of the cross shaft 3.

[0037] In this embodiment, a shaft supporting boss 12 is protruded from the center of the bottom of the groove of the bearing bowl body 1, and a grease accumulation groove 13 is recessed on the end face of the shaft supporting boss 12, thereby ensuring reliable support for the end face of the corresponding shaft of the cross shaft 3.

[0038] At the same time, the bottom of the groove of the bearing bowl body 1 is recessed to form an annular grease storage groove 14, which surrounds the shaft supporting boss 12, so that the bottom of the groove of the bearing bowl body 1 can store more grease, thereby improving the lubrication effect on the end face of the corresponding shaft of the cross shaft 3.

[0039] Embodiment 2:

[0040] See also Figure 3A low friction torque needle roller bearing comprises a bearing bowl of embodiment 1 and a plurality of needle rollers 2 matched with a needle roller mounting groove 11, wherein each needle roller 2 is rotatably mounted in parallel in a circular shape in the needle roller mounting groove 11, that is, each needle roller 2 can roll in the needle roller mounting groove 11, and the rotation axes of each needle roller 2 are parallel to each other and evenly distributed around the rotation axis of the bearing bowl body 1.

[0041] It should be pointed out that each needle roller 2 can also be installed in the needle roller mounting ring groove 11 through a needle roller cage, so as to prevent the needle roller 2 from moving.

[0042] Embodiment 3:

[0043] See also Figure 4-Figure 6 A cross-axis universal joint comprises a cross-axis 3, two yokes 4 matched with the cross-axis 3 and a low-friction torque needle bearing of Example 2. The four axes of the cross-axis 3 arranged in a cross are respectively embedded in the bearing bowl body 1 of the corresponding low-friction torque needle bearing, and can be rotatably supported on each needle roller 2 of the corresponding low-friction torque needle bearing. The needle roller mounting ring groove 11 and the grease accumulation groove 13 of each low-friction torque needle bearing are filled with grease. The two yoke arms of the yoke 4 are provided with bearing mounting holes 41 matched with the bearing bowl body 1. The four bearing mounting holes 41 are arranged in a cross. The bearing bowl bodies 1 of the four low-friction torque needle bearings are respectively embedded in the corresponding bearing mounting holes 41 with interference fit, that is, each yoke 4 rotates synchronously with the two bearing bowl bodies 1 mounted thereon.

[0044] Furthermore, a plurality of bearing bowl limiters 42 are installed near the outer end of each bearing mounting hole 41 , thereby effectively limiting the maximum installation depth of the bearing bowl body 1 and preventing over-installation.

[0045] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make a variety of similar expressions without violating the purpose and claims of the present invention, and such changes fall within the scope of protection of the present invention.

Claims

1. A bearing bowl, comprising a bearing bowl body (1), the bearing bowl body (1) being a circular groove structure with one end open, a circle of needle roller mounting ring groove (11) being recessed on the circumferential groove wall of the bearing bowl body (1), and a grease accumulation groove (13) being recessed on the groove bottom of the bearing bowl body (1), characterized in that: The grease accumulation groove (13) is composed of a plurality of long linear grooves (131) and a plurality of short linear grooves (132). Both the long linear grooves (131) and the short linear grooves (132) are linear groove structures, and the length of the long linear grooves (131) is greater than the length of the short linear grooves (132). Each of the long linear grooves (131) and each of the short linear grooves (132) extends radially along the groove bottom of the bearing bowl body (1), and the inner end of each of the long linear grooves (131) extends to the center point of the groove bottom of the bearing bowl body (1), and a short linear groove (132) is provided between any adjacent long linear grooves (131).

2. The bearing bowl according to claim 1, characterized in that: Each long linear groove (131) is evenly distributed along the center point of the groove bottom of the bearing bowl body (1), and each short linear groove (132) is evenly distributed along the center point of the groove bottom of the bearing bowl body (1).

3. The bearing bowl according to claim 2, characterized in that: Each short linear groove (132) is located at the center line between two adjacent long linear grooves (131).

4. The bearing bowl according to any one of claims 1 to 3, characterized in that: The distance between the outer end of each long linear groove (131) and the center point of the groove bottom of the bearing bowl body (1) is equal to the distance between the outer end of each short linear groove (132) and the center point of the groove bottom of the bearing bowl body (1).

5. The bearing bowl according to claim 4, characterized in that: The distances between the inner ends of each short linear groove (132) and the center point of the groove bottom of the bearing bowl body (1) are equal.

6. The bearing bowl according to any one of claims 1 to 3, characterized in that: The center point of the groove bottom of the bearing bowl body (1) is recessed to form a center point groove (133), and the center point groove (133) is a circular groove structure, and the inner end of each long linear groove (131) extends to the center point groove (133).

7. The bearing bowl according to any one of claims 1 to 3, characterized in that: A shaft supporting boss (12) is protruded from the center of the groove bottom of the bearing bowl body (1), and the grease accumulation groove (13) is recessed on the end surface of the shaft supporting boss (12).

8. A low friction torque needle roller bearing, characterized in that: It comprises a bearing bowl as described in any one of claims 1 to 7 and a plurality of needle rollers (2) matched with a needle roller mounting groove (11), wherein each needle roller (2) is rotatably mounted side by side in a circular shape in the needle roller mounting groove (11), and the rotation axes of each needle roller (2) are parallel to each other and evenly distributed around the rotation axis of the bearing bowl body (1).

9. A cross-axis universal joint, characterized in that: It comprises a cross shaft (3), two yokes (4) matched with the cross shaft (3) and four low-friction torque needle bearings as claimed in claim 8, wherein the four shafts of the cross shaft (3) arranged in a cross are respectively embedded in the bearing bowl body (1) of the corresponding low-friction torque needle bearing and can be rotatably supported on each needle roller (2) of the corresponding low-friction torque needle bearing, and the needle roller mounting ring groove (11) and the grease accumulation groove (13) of each low-friction torque needle bearing are filled with grease, and the two yoke arms of the yoke (4) are provided with bearing mounting holes (41) matched with the bearing bowl body (1), and the four bearing mounting holes (41) are arranged in a cross, and the bearing bowl bodies (1) of the four low-friction torque needle bearings are respectively embedded in the corresponding bearing mounting holes (41) with interference fit.

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