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Rotation support device for pinion shaft

A pinion shaft and rotary support technology, applied in gear transmission, bearing assembly, bearings for rotary motion, etc., can solve problems such as saving fuel consumption and increase in automobiles that are difficult to deal with, ensuring the rigidity of bearings and preventing axial displacement. Excessive amount, the effect of ensuring axial rigidity

Inactive Publication Date: 2011-08-31
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this structure, the load capacity can be increased compared with the case where a single row angular contact ball bearing is used as the rolling bearing on the side opposite to the pinion, but the reverse rotation torque (rotational resistance) will increase, so it is difficult to cope with automobile saving. fuel consumption requirements

Method used

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  • Rotation support device for pinion shaft
  • Rotation support device for pinion shaft
  • Rotation support device for pinion shaft

Examples

Experimental program
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Effect test

Embodiment

[0076] Next, refer to Figure 4-8 Experiments conducted to confirm the effects of the present invention will be described. First, an experiment conducted to obtain the relationship between the outer ring groove R ratio (Ro / Bd) and the dynamic torque will be described. In the experiment, 8 samples (contact angles are all 40°) with different values ​​of the outer ring groove R ratio in the range of 0.51 to 0.58 were used. 73mm 2 / s) Mineral oil, each sample was run under forced lubrication conditions. In addition, an axial load (2770N) was applied to each sample, and the rotational speed of the inner ring was 3000min. -1 . Figure 4 shows the results of the experiments performed in this way. by the Figure 4 From the experimental results shown, it is clear that the dynamic torque is sufficiently reduced when the outer ring groove R ratio is set to a value larger than 0.52.

[0077] Next, an experiment performed to obtain the relationship between the outer ring groove R ra...

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PUM

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Abstract

Provided is a rotation support device for a pinion shaft, said device having a structure whereby it is possible to ensure that a rolling bearing on the opposite side from a pinion gear has sufficient axial rigidity while reducing the dynamic torque during operation and the starting torque upon operation startup. A single-row angular contact ball bearing (14a) is used as the rolling bearing on the opposite side from the pinion gear. The ratio (Ro / Bd) between the radius of curvature (Ro) of the outer race track (22a) and the diameter (Bd) of each ball (25a) is adjusted to be within the range of 0.52 < Ro / Bd <= 0.56, and the contact angle (alpha) is adjusted to be within the range of 35 DEG to 45 DEG.

Description

technical field [0001] The present invention relates to a rotary support device for a pinion shaft constituting, for example, a differential device of an automobile or a transfer device of a four-wheel drive vehicle. Background technique [0002] A differential device of an automobile and a transfer device of a four-wheel drive vehicle generally have a structure including a pinion shaft provided with a pinion at one end, and the The pinion shaft is rotatably supported on the inner side of the housing so as to be able to support axial loads in both directions. [0003] Figure 9 The differential gear described in Patent Document 1 is shown in which the pinion shaft rotation support device of the first conventional structure is incorporated. The differential device is installed in the middle of the power transmission system of the car, and is used to vertically change the direction of rotation while reducing the rotational speed of the drive shaft. In this differential gear,...

Claims

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Application Information

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IPC IPC(8): F16C33/58F16C19/16F16C19/18F16H48/06
CPCF16H2048/423F16C19/182F16C2361/61F16C19/56F16C2240/70F16C19/543F16H1/145F16C19/505F16C19/163F16C19/548F16C41/02F16C2240/34F16C2240/46F16C2240/76
Inventor 田中孝道斋藤智治田上泰资
Owner NSK LTD
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