Tripod type constant velocity universal joint
a constant velocity, universal joint technology, applied in the direction of yielding couplings, metal-working apparatuses, couplings, etc., can solve the problems of poor durability, unsatisfactory results, and poor vibration characteristics, so as to achieve lower vibration and lower induction thrust
Inactive Publication Date: 2009-08-13
SUGIYAMA TATSURO
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Benefits of technology
[0016]An object of this invention is to achieve further lower induction thrust and lower vibration by optimizing the shape of a contact ellipse between a trunnion and a ring of PTJ.
[0020]The inventor of the present invention comes to this invention without sticking to the conventional idea that is necessary to minimize contact pressure in which a contact ellipse shape is slightly elongated in a circumferential direction relative to an axial direction of the trunnion so that an operating angle of the joint can be widened while keeping induction thrust and vibration lower level.
Problems solved by technology
Therefore, an optimum contact ellipse area and shape have been studied, but still satisfactory results have not been obtained yet.
However, it becomes clear that when the operating angle becomes greater than such certain operating angle, vibration characteristics get worse because the contact ellipse interferes with roller assembly movement.
Therefore, simply increasing a maximum angle of inclination between a trunnion 22 and a roller assembly may deteriorate vibration characteristics, leading to durability getting worse due to an increase in contact pressure.
This becomes a design restriction for effecting a larger operating angle when applied to drive shafts of automobiles.
Method used
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[0032]Hereinafter, preferred embodiments of the present invention are given by referring to the drawings. A structure of a tripod type constant velocity universal joint of this invention is as shown in FIG. 1 through FIG. 4. Aforementioned explanations of FIG. 1 through FIG. 4 are the same to this invention and to be applicable to this invention. A novel feature of this invention lies in the combination of the aspect ratio b / a of trunnion cross-section shown in FIG. 3 and the radius of curvature r of convex R in a longitudinal section of ring inner surface as shown in FIG. 4.
[0033]PTJ transmits torque by contacting an ellipse shaped trunnion 22 and a ring 32 with an inner surface as convex surface R, so a relaxation consideration of contact pressure of both parts is required. As to the relaxation of contact pressure, the patent document I defines a contact ellipse shape with r=2.9a and b / a=0.86 in the case of an operating angle of 15 degrees. (Refer to Table 1 of patent document 1.)...
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Abstract
A tripod type constant velocity universal joint comprises an outer joint member having three track grooves with roller-guiding surfaces opposing each other circumferentially, a tripod member with three trunnions protruding in a radial direction, a plurality of rollers each inserted into a corresponding track groove and a plurality of rings each fitted on the corresponding trunnion for supporting the roller rotatably. An outer surface of the trunnion is formed to take on a straight shape in a longitudinal section and an ellipse shape in a cross-section. A contact ellipse shape between the trunnion and the ring is modified so as to render the radius of curvature r smaller while keeping an aspect ratio b / a stable in comparison with a contact ellipse shape being defined to minimize contact pressure between a ring inner surface and a trunnion outer surface.
Description
[0001]This application is a divisional of application Ser. No. 11 / 411,837, filed Apr. 27, 2006.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a tripod type constant velocity universal joint for use in a drive train of automobiles and other industrial machineries, and especially relates to tripod type constant velocity universal joints that expand a low vibration characteristics range of induction thrust to wider operating angles between two connected rotary shafts.[0004]2. Description of the Background Art[0005]A constant velocity universal joint is one of the universal joints that enables constant velocity linkage even if a driving shaft axis and a driven shaft axis make an operation angle. The constant velocity universal joints are classified as either fixed joint or sliding joint. A sliding joint enables relative axial displacement by a plunging behavior of a joint. Furthermore, a sliding joint includes a tripod joint which compri...
Claims
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IPC IPC(8): B21D53/10
CPCF16D3/2055Y10T29/497F16D2003/2026F16D2003/2023F16D3/22
InventorSUGIYAMA, TATSURO
OwnerSUGIYAMA TATSURO