KR19990025472U - Grease-lubricated tripod joint - Google Patents

Abstract

The present invention allows the rotary roller to operate smoothly in the state where the joint is articulated, thereby reducing slippage between the guide surface of the spider housing and the rotary roller, thereby preventing wear of the guide groove and the rotary roller and simplifying the structure. To reduce productivity and production costs.

Therefore, the present invention is a spider assembly 11 is composed of a rotating roller 13 is formed with three fixing pins 12b in a direction orthogonal to the shaft and fitted to the fixing pins 12b, and the spider assembly ( 11) is inserted into the spider housing 21, the guide groove 22 is formed therein, and the tripod material joint to absorb the potential and angle change on the two axes by the interaction of the spider assembly 11 In the present invention, an inner roller 23 fitted between the fixing pin 12b and the rotary roller 13 and an oil groove 31 recessed in an outer circumferential surface of the fixing pin 12b are included. By providing a grease lubricated tripod material joint, the structure is simplified, thereby improving productivity and reducing production costs.

Description

Tripod universal joint from grease lubrication

The present invention relates to a universal joint of an automobile drive shaft that transmits rotational power generated from an engine to a wheel, and more specifically, to lengthwise displacement in a truncated tripod joint. A grease lubricated tripod material joint is used to reduce wear between the housing and the rotary rollers, which occurs in the process of the rotary rollers sliding over the spider for maintenance.

In general, the drive shaft in the vehicle is connected to the output shaft of the transmission, that is, the propulsion shaft is to serve to transmit the rotational power transmitted from the engine to the wheel.

This drive shaft should be able to absorb the angular change caused by the displacement of the wheel according to the driving state, the material joint is installed so that the angular change and the length change of the drive shaft caused by the angle change can be absorbed Thus, the rotational power output from the transmission is smoothly transmitted to the wheels.

The above-mentioned material joints vary in form and number of installation depending on the type and arrangement of the driving wheel position, suspension system, steering system, etc., and largely the wheel-side joints that can digest the steering angle by the steering system. It is divided into transmission-side material joints that can absorb the maximum amount of displacement caused by vertical movement of the device.

On the other hand, the suspension system of the passenger car has been adopted most recently because the independent suspension is adopted to improve the ride comfort, the material joint of the drive shaft used in the vehicle body having such an independent suspension suspension is the expansion of the suspension spring according to the driving conditions (伸縮As the length and angle change are repeatedly received on the drive shaft during the operation, a material joint with a function of compensating for the length change and the angle change of the drive shaft in the axial potential is produced.

Such drive shaft joints capable of changing the axial potential and the angle include tripod joints, double offset joints, and ball-type joints.

1 and 2 illustrate an example of a wheel-side tripod joint among the drive shaft joints having a function of axial potential and angle change as described above, which will be briefly described as follows.

As shown in the drawing, three fastening holes 112a are formed in the center thereof and are formed at intervals of 120 ° in the axially perpendicular direction on the outer circumferential surface of the spider 112 which is fastened and fixed to the axle side drive shaft 110 to which rotational power is transmitted from the transmission. Spider assembly 111 is provided with a rotating roller 113, the fixing pin 112b is extended and the needle bearing 117 is inserted and fixed so as to be rotatable to the fixing pin 112b, and one side is opened therein. The spider assembly 111 is formed with a space portion is fastened and the other side is composed of a spider housing 121 is connected in the axial direction to the wheel side drive shaft 120 fastened to the wheel wheel.

On the inner circumferential surface of the spider housing 121 to which the spider assembly 111 is fastened, a guide roller 122 is inserted into the rotary roller 113 of the spider assembly 111 and flows in an axial direction, thereby driving the wheel-side drive shaft 120. ) To transmit rotational power.

On the other hand, the groove 123 is formed at the tip of the guide groove 122 of the spider housing 121, the rotary roller 113 of the spider assembly 111 in the groove 123 in the axial direction from the guide groove 122. The ring retainer 124 is fastened to prevent it from being separated from the spider housing 121 when it flows.

In addition, one end of the boot 114 is fixed to the axle-side drive shaft 110 to cover the spider assembly 111 to prevent foreign substances such as dust from flowing into the spider housing 121 so that the other end is spider. It is fastened to the outer edge of the housing 121 by a clamp 115.

The tripod material joint of the vehicle drive shaft configured as described above has the rotary roller 113 and the needle bearing 117 of the spider assembly 111 guide grooves of the spider housing 121 according to the displacement of the wheel according to the driving state. It is possible to give a change in the overall length of the drive shaft and the change of the angle as it rotates in the axial direction while rotating in 122), and also to respond to the repetition of the length change and the change of angle to the drive shaft during the expansion and contraction of the suspension system.

On the other hand, the ring retainer is fastened to the groove 123 of the guide groove 122 when the length of the rotating roller 113 of the spider assembly 111 is axially flowing in the guide groove 122 of the spider housing 121 Since the rotary roller 113 is prevented from being separated from the guide groove 122 by the 124, the spider assembly 111 is prevented from being separated from the spider housing 121.

As shown in FIG. 2, the rotary roller 113 fitted to the fixing pin 112b formed on the spider 112 of the spider assembly 111 is in contact with the fixing pin 112b. A guide roller 122 having a rotary roller 113 formed therein in the spider housing 121 according to a length displacement and an angular displacement by a needle bearing 117 into which a plurality of needles are inserted so as to smoothly rotate. It rotates in contact with it.

The needle bearing of the spider assembly takes a lot of time for assembly because of the large number of needles, and the sliding occurs in contact with the fixing pin to maintain the length displacement of the drive shaft in the state where the joint is angularly displaced. In addition, there is a problem that wear occurs between the guide surface of the spider housing rubbing with the rotary roller by this sliding phenomenon.

In addition, the needle bearing requires a lot of expensive needles, the unit price is increased during manufacturing, and the assembly cost is required accordingly.

Therefore, the present invention has been devised to solve the above problems, so that the rotary roller can be operated smoothly in the state of joint joint to reduce the slip generated between the guide groove and the rotary roller of the spider housing Accordingly, the purpose of the present invention is to prevent wear of the guide surface and the rotary roller and to reduce the productivity and production cost by simplifying the structure.

1 is a cross-sectional side view showing the configuration of a tripod material joint generally used;

2 is a cross-sectional view taken along the line A-A of FIG.

Figure 3 is one side cross-sectional view showing the configuration of the tree port joint according to an embodiment of the present invention,

Figure 4 is a side cross-sectional view showing a spider assembly according to an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10 axle side drive shaft 11 spider assembly

12: spider 12a: fastener

12b: fixed pin 13: rotary roller

20: wheel side drive shaft 21: spider housing

22: guide groove 23: inner roller

25: communication hole 27: projection

29: insertion hole 31: oil groove

The present invention for achieving the above object is a spider assembly consisting of a rotating roller is formed in the three fixing pins in the direction orthogonal to the shaft, and the spider assembly is inserted and guided therein An inner roller fitted between the fixing pin and the rotary roller, the tripod material joint adapted to absorb a dislocation and an angle change on two axes by the interaction of the spider housing with the groove formed therein; An oil groove formed on the outer circumferential surface of the fixing pin, and the oil groove is formed in a spiral shape with a predetermined angle so that grease may be mixed to lubricate the fixing pin and the inner roller, and the inner roller is Outer circumferential surface to be in line contact with the inner circumferential surface of the communication hole formed in the rotary roller A grease-lubricated tripod material joint is provided, characterized in that the projections protrude in a hemispherical shape.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a side cross-sectional view showing the configuration of the tripod material joint according to an embodiment of the present invention, Figure 4 is a side cross-sectional view of the spider assembly of the material joint of the tripod according to an embodiment of the present invention, As described above, the tripod material joint of the present invention is first orthogonal to the axial direction of the spider 12 having the fastening hole 12a at the center and the outer circumferential surface of the spider 12 so as to be installed on the axle-side drive shaft 10. And three fixed pins 12b, which are formed to maintain the angle of 120 °, are rotatably installed on the fixed pins 12b, and a rotary roller 13 having a communication hole 25 formed in the center thereof, and a rotary roller. Spider assembly 11 is composed of an inner roller 23 is inserted into the communication hole (25) of the (13) and the insertion hole 29 is formed to be fitted to the fixing pin (12b), and one side The spider assembly 11 is inserted into the opening The fastening space is formed and the other side is composed of a spider housing 21 axially connected to the wheel side drive shaft 20 is connected to the wheel wheel.

The outer circumferential surface of the inner roller 23 is formed circumferentially protruding projection 27 having a spherical shape, the projection 27 is in line contact with the inner circumferential surface of the communication hole 33 formed in the rotary roller 13 have.

A spiral oil groove 31 is formed on the outer circumferential surface of the fixing pin 12b, and the inner roller 23 is angular displacement and length displacement of the spider assembly 11 by grease injected into the oil groove 31. As a result, the inner roller 23 can move smoothly.

A guide groove 22 is formed on the inner circumferential surface of the spider housing 21 to which the spider assembly 11 is fastened so that the rotary roller 13 installed on the spider 12 is inserted therein so as to be movable in the axial direction. The rotational force can be transmitted to the wheel side drive shaft 20 in accordance with the rotation of 10).

When described in more detail the operating state of the subject innovation is configured as follows.

As the axle side drive shaft 10 rotates, the interlocking spider assembly 11 rotates, and the spider 12 of the spider assembly 11 is inserted into the guide groove 22 formed in the spider housing 21. It is linked to the rotation of the spider assembly 11 so that the spider housing 21 can be rotated, the wheel side drive shaft 20 is rotated in accordance with the rotation of the spider housing 21.

The tree port joint of the drive shaft moves in the axial direction while the rotating roller 13 of the spider 12 rotates in the guide groove 22 of the spider housing 21 according to the displacement of the wheel wheel according to the driving state. The overall length change and the angle change of the can be given, and the repetitive response to the length change and the angle change of the drive shaft during the expansion and contraction of the suspension system.

At this time, as shown in Figure 4, the joint of the spider assembly 11, the angular displacement is made by the expansion and contraction action of the suspension device is inserted into the inner pin (12b) is formed in the axially perpendicular direction on the outer peripheral surface ( The spherical projection 27 formed on the outer circumferential surface of 23) protrudes, and the projection 27 is in line contact with the inner circumferential surface of the communication hole 25 formed in the rotary roller 13. The contact makes the spider assembly 11 smoothly articulated according to the angular displacement of the wheel.

The oil groove in which grease is forcedly mixed by being formed in a spiral shape at an angle of about 30 ° on the inner circumferential surface of the fixing pin 12b during the operation of the spider assembly 11 according to the displacement or length displacement of the changing angle as described above. The inner roller 23 is rotated by being fitted to the fixing pin 12b by 31 to cool the frictional heat generated by the friction with the fixing pin 12b, and the inner roller 23 rotates. The lubrication is performed so that the sliding movement can be performed smoothly.

Therefore, by reducing the friction generated between the fixing pin 12b and the inner roller 23 by the grease that is forcibly mixed in the oil groove 31, the friction occurs between the fixing pin 12b and the inner roller 23 by the friction. In addition to reducing wear, the vibration generated in the spider assembly 11 can be reduced.

As described above, the present invention inserts the inner roller into the rotary roller to be fastened with the fixing pin, and forcibly mixes grease in the oil groove formed on the fixing pin to fold the spider assembly according to the length displacement and the angle displacement. It is possible to reduce the slip generated in the fixing pin and the inner roller and to simplify the structure, thereby reducing the wear caused by the sliding and the vibration generated in the spider assembly. There is an effect that can be improved.

In addition, by simplifying the structure of the spider assembly, it is possible to reduce the weight of the tripod material joint, to reduce the time required during the assembly process by a simple structure, and to reduce the production cost by improving productivity It becomes possible.

Claims (3)

Three fixing pins 12b are formed in a direction orthogonal to the shaft, and the spider assembly 11 composed of a rotating roller 13 fitted to the fixing pins 12b and the spider assembly 11 are inserted. In the tripod material joint to absorb the two-axis potential and the angular change by the interaction of the spider housing 21 and the spider assembly 11 having the guide groove 22 formed therein, the fixing pin Grease lubrication tree, characterized in that it comprises an inner roller (23) fitted between the (12b) and the rotary roller (13), and the oil groove 31 is formed in the outer peripheral surface of the fixing pin (12b) Ford material joint. 2. The oil groove 31 of claim 1, wherein the oil groove 31 is formed in a spiral shape at a predetermined angle so that grease may be mixed to lubricate the fixing pin 12b and the inner roller 23. Grease lubricated tripod material. According to claim 1, wherein the inner roller 23 is a projection (29) in a hemispherical shape on the outer circumferential surface to be in line contact with the inner circumferential surface of the communication hole 25 formed in the rotary roller (13) Characterized by grease lubricated tripod material.