JPH04109227U - constant velocity universal joint - Google Patents

Abstract

(57) [Summary] [Purpose] A ball is interposed between the trunnion of the tripod joint and the roller to allow the roller to swing freely. [Structure] Three trunnions 4 are installed at the end of the intermediate shaft 3. Arc-shaped grooves 4a are formed on the front and back surfaces of the trunnion 4, respectively. Note that an arcuate groove 8a is formed in the intermediate member 8 that covers the outer periphery of the trunnion 4 so as to face the groove 4a. A ball 7 is installed between these grooves 4a and 8a, and the intermediate member 8 is attached to the trunnion 4 via this ball 7. Therefore, the rotation of the ball 7 causes the intermediate member 8 and the roller 6 supported on the outer periphery of the intermediate member 8 to swing.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a constant velocity universal joint with a large degree of freedom and smooth movement.

0002

[Conventional technology]

Traditionally, torque was used as a means of transmitting power from an automobile's transmission to the wheels. From the viewpoint of positional relationship with the wheels of the transmission, constant velocity universal joints are used. There is something that exists.

0003 As this constant velocity universal joint, as shown in Figures 4 and 5, Three trunnions 14 are provided at the end of the continuous intermediate shaft 13, and this end is It is inserted into the outer ring 12 formed at the shaft end of the drive shaft 11 on the transmission side to generate power. A tripod joint 20 that transmits this may be employed.

0004 That is, this tripod joint 20 is located on the outer periphery of the trunnion 14. A roller 16 is rotatably attached via a needle 15, which is a needle-like roller. In addition, the outer peripheral surface of the roller 16 is formed into a substantially spherical shape, and the outer ring 12 in contact with the outer peripheral surface is formed into a substantially spherical shape. These surfaces are aligned so that a cylindrical inscribed surface with the same radius as the roller 16 is formed. The structure is such that it slides smoothly on both sides. Therefore, the drive shaft 11 rotates. Then, as the outer ring 12 rotates, the intermediate shaft 13 having the trunnion 14 rotates toward the drive shaft 1. 1, and power is transmitted.

[0005] Incidentally, as an example of such a constant velocity universal joint, Japanese Utility Model Application No. 61-114128 The technique described in is known.

[0006]

[Problem that the idea aims to solve]

As mentioned above, the roller 16 attached to the outer circumference of the trunnion 14 Although it is possible to rotate the shaft around the axis of the shaft 14, it is difficult to rotate it in the direction of the arrow c shown in FIG. It was difficult to move. However, as the nature of tripod joint 20 , there is usually a predetermined angle between the drive shaft 11 and the intermediate shaft 13. The structure was such that the trunnion 14 swung as the trunnion 1 rotated.

[0007] As a result, when the intermediate shaft 13 rotates through this joint 20, the rotation occurs in the direction of arrow c. The resistance in the direction is large, causing unreasonable slippage between the roller 16 and the outer ring 12, etc. In this case, thrust force is periodically generated on the intermediate shaft 13, and as a result, vibration is generated in the vehicle. There was a risk that this would happen.

[0008]

[Means to solve the problem]

The constant velocity universal joint of this invention has a radial shape on either end of the drive shaft or driven shaft. an arc-shaped groove around an axis in a direction that intersects one of the above-mentioned axes; a trunnion formed therein, and a trunnion located to cover the trunnion and in the groove an intermediate member having facing grooves formed therein; a ball rotatably disposed within these grooves; rotation relative to the intermediate member about the radial axis of the radially mounted trunnion; A driven shaft that is rotatably supported and has a spherical outer peripheral surface and does not have the trunnion. The roller is characterized by having a roller in contact with the outer ring of the drive shaft.

[0009]

[Effect]

The intermediate member is towed via a ball placed between the groove of the trunnion and the groove of the intermediate member. Supported by Runion. Also, the ball rolls and the trunnion is attached. The intermediate member swings around an axis in a direction intersecting the axis.

0010 In addition, the trunnion can be mounted on the outer peripheral surface of the roller, which is rotatably supported by the intermediate member. Power is transmitted through contact with the outer ring of the shaft on the unscrewed side. Therefore, this power transmission When reaching, the roller swings together with the intermediate member.

[0011]

【Example】

One embodiment of the constant velocity universal joint of the present invention is shown in FIGS. 1 to 3, and The present embodiment will now be explained. Note that the same parts as those explained in the conventional technology are Reference numerals are given and duplicate explanations are omitted.

0012 Three trunnions 4 are installed radially like a conventional tripod joint. The surrounding portions of each trunnion 4 of the tripod joint are shown in FIGS. 2 and 3. difference Furthermore, FIG. 1 shows an exploded perspective view of the main parts of the tripod joint. In addition, tripod Figure 1 shows an exploded perspective view of the main parts of the joint. As shown in these figures, the intermediate axis The back surface of the trunnion 4 protruding from the trunnion 3 has an arcuate groove centered at its center. 4a are formed in pairs. In addition, so as to cover the outer periphery of the trunnion 4, An intermediate member 8 is installed on the trunnion 4, and has an inner surface facing the groove 4a of the trunnion 4. A pair of grooves 8a having the same shape as this groove 4a are formed respectively.

[0013] A ball 7 is arranged between each of these grooves 4a and 8a. To prevent the ball 7 from shifting, the pin 2a located at the proximal end is secured with a screw or the like. It is supported by a leaf spring 2 attached to the center of the nion 4.

[0014] That is, in the leaf spring 2, the ball 7 is located above and below the arcuate grooves 4a and 8a in FIG. The ball 7 is rotatably sandwiched and supported so as to be located at the center.

[0015] On the other hand, on the cylindrical outer circumference side of the intermediate member 8, there is a structure extending in the vertical direction as shown in FIG. A roller 6 is rotatably attached via a plurality of needles 5 arranged in a row. Ru. As shown in FIGS. 2 and 3, this roller 6 has a ring shape, and has a center It has a spherical outer peripheral surface so that the center part protrudes outward. Therefore, the roller 6 The spherical outer peripheral surface extends around the radial axis of the trunnion 4 that is radially attached to the intermediate shaft 3. This means that it can be rotated to

[0016] As mentioned above, the trunnion assembly consists of the trunnion 4, ball 7, roller 6, etc. The operation of the tripod joint having three sets of assemblies 1 will now be described.

[0017] When the drive shaft 11 of the transmission (not shown) rotates, the The outer ring 12 rotates. Along with this, the cylindrical inscribed surface of the outer ring 12 Power is transmitted to the trunnion assembly 1 through the roller 6 in contact with the The intermediate shaft 3 will rotate.

[0018] That is, power is transmitted from the roller 6 to the trunnion 4 via the needle 5 and the ball 7. is reached, and the intermediate shaft 3 connected obliquely at a predetermined angle with respect to the drive shaft 11 is rotated. Ru. As a result, as shown by arrow D in FIG. 2, a force is generated that causes the roller 6 to swing. However, the ball 7 is rolled along the grooves 4a and 8a between the trunnion 4 and the intermediate member 8. As a result, the roller 6 swings smoothly together with the intermediate member 8. Therefore, intermediate No thrust force is generated on the shaft 3.

[0019] Note that in this embodiment, the trunnion 4 is attached to the intermediate shaft 3, which is the driven shaft. However, it is also possible to install the trunnion on the drive shaft side. The same effects as in the example can be obtained.

[0020]

[Effect of the idea]

According to the constant velocity universal joint of the present invention, a ball is installed between the trunnion and the intermediate member. As a result of this structure, when transmitting rotational power from the drive shaft to the driven shaft, The rolling of the ball made the swinging of the roller easier.

[0021] Therefore, the frictional resistance that occurs when the rollers are oscillated is reduced, and the thrust of the driven shaft is reduced. It is possible to reduce the axial force, which is the main force, and reduce vehicle vibration. Ru.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of essential parts of a tripod joint, which is an embodiment of the constant velocity universal joint of the present invention.

FIG. 2 is a sectional view of a trunnion assembly according to an embodiment of the constant velocity universal joint of the present invention.

FIG. 3 is a sectional view taken along the line AA in FIG. 2;

FIG. 4 is a sectional view of a conventional tripod joint.

FIG. 5 is a sectional view taken along the line BB in FIG. 4;

[Explanation of symbols]

2 leaf spring 3,13 Intermediate shaft 4,14 Trunnion 5,15 needle 6,16 roller 7 ball 8 Intermediate member 4a, 8a groove

Claims (1)

[Scope of utility model registration request] 1. A plurality of trunnions that are attached radially to either end of a drive shaft or a driven shaft and have arcuate grooves formed around an axis in a direction intersecting either of the axes, and the trunnion. an intermediate member positioned so as to cover the grooves and having grooves formed opposite to the grooves; a ball rotatably disposed within these grooves; 1. A constant velocity universal joint characterized by having a roller that is rotatably supported by a roller and that has a spherical outer peripheral surface that contacts an outer ring of a driven shaft or a drive shaft that does not have the trunnion.