Stationary constant-velocity universal joint

A constant velocity universal joint and outer joint technology, applied in the direction of gear transmission mechanism, elastic coupling, mechanical equipment, etc., can solve the problem of no track groove, etc., to improve the torsional strength, improve the torsional fatigue strength and quasi-static The effect of improving torsional strength and torque transmission efficiency

Inactive Publication Date: 2012-09-12
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in Patent Document 5, there are six balls, and there is no linear portion of the track groove
Therefore, in the UJ-type constant velocity universal joint using eight balls, there has been no structure capable of ensuring durability at low operating angles and improving torque capacity at high operating angles.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120] Example 1 (in Example 1 and Example 2 described later, the outer joint member is called an outer ring, and the inner joint member is called an inner ring)

[0121] A durability test at a common angle (operating angle of 6°) under high torque conditions was carried out, and the results are shown in Table 2 below. In this case, two samples of conventional products (conventional product No. 1, conventional product No. 2) were produced, and two samples of the above-mentioned invention product A1 (invention product A1 No. 1, invention product A1 No. 2) were produced. , respectively manufacture four samples of the invention product A2 and invention product B (invention product A2No.1, invention product A2No.2, invention product A2No.3, invention product A2No.4, invention product B1No.1, invention product B1No .2, Invention B1No.3, Invention B1No.4). The durability test was carried out under the conditions of a torque of 834 Nm and a rotational speed of 230 r / min.

[0122] [...

Embodiment 2

[0127] Next, an endurance test at a high angle was carried out, the results of which are shown in Table 3 below. In this case, two samples of conventional products (conventional product No. 1, conventional product No. 2), and two samples of invention product A1, invention product A2, and two invention products of product B (invention product A1, No. 1, Invention A1No.2, Invention A2No.1, Invention A2No.2, Invention B1No.1, Invention B1No.2). The durability test was carried out under the conditions of a torque of 549 Nm, an angle of 0 to 46° (swing), and a rotation speed of 80 r / min.

[0128] [table 3]

[0129]

[0130] In the case of running for 3.7 hours, conventional product No. 1 and conventional product No. 2 had defects caused by lack of tracks in the track grooves on the inner side of the outer ring. Therefore, the two conventional products continued to operate only by replacing the outer ring with a new one, but in the case of running for 7.4 hours, the conventiona...

Embodiment 3

[0136] Next, a rotational torsional strength test was performed. In this test, the operating angle was set at 46°, and the torque was gradually increased in a state of low-speed constant rotation until it was broken, and the strength was evaluated based on the torque value at the time of breakage. The result is in Figure 16 The graph and shown in Table 5 below. In conventional products, the inner ring is replaced with the invention specification (a) of Table 4, the cage is replaced with the invention specification (b) of Table 4, and the outer ring is replaced with the invention specification of Table 4 ( c), components of the invention specification (d) in which the outer ring is replaced by Table 4, components of the invention specification in which the inner ring, cage, and outer ring are replaced by (a), (b) and (c), respectively, Invention product B1 was tested with members of the invention specifications substituted for (a), (b), (c), and (d).

[0137] [table 5]

[...

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PUM

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Abstract

Provided is an undercut-free stationary constant-velocity universal joint with eight balls, which can improve a torque capacity at a high operating angle while ensuring durability when being operated at a low operating angle. If the distance between the center of a track groove (32) and the center of a ball (37) is defined as Rt, and the axial distance between the center of the track groove (32) and a joint center plane (P) is defined as F, the ratio (R1) between F and Rt satisfies 0.061<=R1<=0.087. If the radial offset, i.e., the distance between the center of the track groove (32) and a joint center axis (X) is defined as fr, the ratio (R3) between fr and Rt satisfies 0.07<=R3<=0.19. On the bottom surface of the track groove of an internal joint member, a hardened layer is formed, in which if the effective hardening depth at Hv513 is defined as Di, and the diameter of each ball is defined as d, at least the effective hardening depth ratio (Di / d) is not less than 0.111.

Description

technical field [0001] The present invention relates to a fixed type constant velocity universal joint, and more particularly to a type that allows only the angular displacement between two shafts on the driving side and the driven side of the connection, that is, it is used in power transmission systems of motor vehicles and various industrial equipment It is an undercut free fixed type constant velocity universal joint equipped with eight torque transmission balls. Background technique [0002] Fixed-type constant velocity universal joints include a cage type (BJ) (for example, Patent Document 1), an undercut-free type (UJ), and the like. [0003] Such as Figure 17 As shown, the cage-type fixed constant velocity universal joint includes: an outer joint member 3 with a plurality of track grooves 2 formed at equal intervals along the axial direction on the inner spherical surface 1 in the circumferential direction; on the outer spherical surface 4 along the The inner joint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16D3/2237F16D3/20
CPCF16D3/2237F16D3/2245F16D2003/22309F16D2250/0053
Inventor 曾根启助大场浩量吉田和彦伊藤洁洋
Owner NTN CORP
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