KR100633307B1 - Anti axial force tripod-constant velocity joint - Google Patents

Abstract

The present invention relates to a axial force-reduced tripod constant velocity joint for a vehicle, the housing which transmits the rotational torque of the differential device, the inner ring of which three tracks are formed axially at equal intervals in the circumferential direction and the outer ring of the outer ring Cylindrical outer roller which performs rolling linear motion inside the track and transmits the load from the outer ring to the inside by contact, and the outer roller and trunnion which are both counterparts and transmits the load from the outer roller to the inside by contact. A roller bearing for assisting the relative rotational movement of the spider, a spider integrally provided to extend the three trunnions respectively inserted into the roller bearings and having a spherical outer diameter, and in an empty space between the roller bearing and the trunnion; Rolls to widen the contact area between each other so that the transfer load is widely distributed and the roll It includes a needle bearing to help cloud rotational movement between the bearing and the trunnion.

Therefore, it is possible to prevent the lateral fluctuation of the vehicle due to less axial force generation, to improve the NVH characteristics of the vehicle by preventing the occurrence of moment due to eccentricity as well as improving the durability life by enabling uniform load transfer. have.

Constant velocity, joint, tripod, axial force

Description

ANTI AXIAL FORCE TRIPOD-CONSTANT VELOCITY JOINT}

1 is a longitudinal cross-sectional view showing the main portion of the conventional tripod constant velocity joint,

Figure 2 is a longitudinal cross-sectional view showing the main portion of the conventional angle-adjustable roller constant velocity joint,

Figure 3 is a longitudinal cross-sectional view illustrating a situation when the action of the angle-adjustable roller constant velocity joint of Figure 2,

Figure 4 is a longitudinal cross-sectional view showing a reduced force tripod constant velocity joint according to the present invention,

5 is a cross-sectional view taken along line X-X of FIG. 4.

<Description of the symbols for the main parts of the drawings>

10: Tripod constant velocity joint 11: Outer ring

11a: Track 12: Spherical Roller

13: needle 15: retainer

16: retainer 17: spider

17a: trunnion 20: angled roller constant velocity joint

21: paddle 21a: track

22: outer roller 23: needle

24: inner roller 25: spring washer

27: Spider 27a: Trunnions

30: reduced axial tripod constant velocity joint 31: outer ring

31a: Track 31a-1: Guide surface portion

32: outer roller 32a: extension support

33: roller bearing 34: needle bearing

35: cage 37: spider

37a: trunnion

The present invention relates to an axial force-reduced tripod constant velocity joint for a vehicle, and more particularly, less axial force is generated compared to a conventional tripod constant velocity joint, while preventing lateral fluctuation of a vehicle, and also an existing angle-adjustable roller constant velocity joint. Compared to the axial force reduction tripod constant velocity joint which can improve the NVH characteristics of the vehicle by preventing the occurrence of moment due to the eccentricity as well as improving the durability life by uniform load transfer.

In general, a constant velocity joint (constant velocity joint) is used to transmit power to a drive shaft that performs a function of finally transmitting power generated in an engine of a vehicle through a transmission as a driving force to a wheel.

A constant velocity joint is a type of tripod that is well-known as a typical constant velocity joint, in which a power transmission is made at a constant velocity even if a power transmission angle between two axes changes, that is, a rotational speed is not changed even at a predetermined joint angle. (tripod) There are constant velocity joints and angled roller constant velocity joints, the main parts of which are shown in Figs.

Referring to FIG. 1, the tripod constant velocity joint 10 is a housing that transmits the rotational torque of the differential device, and an inner ring 11 having three tracks 11a elongated in the axial direction at equal intervals in the circumferential direction. Cylindrical spherical roller (12) which performs rolling straight and sliding rotational movement inside the outer ring (11) and transmits the load from the outer ring (11) to the needle (13), which is a bearing, to be described later by contact. And a cylindrical needle for assisting relative rotation and translation between the spherical roller 12 and the trunnion 17a described later, and transferring the load from the spherical roller 12 to the trunnion 17a by contact. 13 and three trunnions 17a each formed radially so as to transmit the load from the needle 13 to the axis connected to the center thereof and inserted into the tracks 11a of the outer ring 11 described above, respectively. With spider 17 having integrally with There is sex.

That is, the spherical roller 12 and the needle 13 are provided so as to be rotatable between each trunnion 17a of the spider 17 and the track 11a of the corresponding outer ring 11, and these spherical rollers 12 In order to prevent the needle and needle 13 from escaping from the trunnion 17a, a retainer 15 and a retainer ring 16 supporting the same are provided at the distal end of the trunnion 17a. .

On the other hand, referring to Figure 2, the angle-adjustable roller constant velocity joint 20 is a housing that transmits the rotational torque of the differential device inside the outer ring formed three tracks 21a long in the axial direction at equal intervals in the circumferential direction A cylindrical outer roller 22 having a spherical outer diameter portion 21 and a rolling linear motion inside the outer ring 21 and transferring a load from the outer ring 21 to a needle 23, which will be described later, by contact; The cylindrical needle 23 which assists the relative rotational movement between the outer roller 22 and the inner roller 24 to be described later and transfers the load from the outer roller 22 to the inner roller 24 by contact, Cylindrical inner roller 24 for transmitting the load from the needle 23 to the trunnion 27a to be described later, and formed so as to extend in the radial direction to transfer the load from the inner roller 24 to the axis connected to the center Track 21a of the outer ring 21 described above. And a spider 27 integrally provided with three trunnions 27a each having a spherical outer diameter portion.

Then, in order to prevent the needle 23 and the inner roller 24 from being separated, the spring washer 25 is provided to protrude in the horizontal direction through the upper and lower inner surfaces of the outer roller 22.

On the other hand, in the above-described tripod constant velocity joint 10, the spherical roller 12 has a spherical outer surface, which allows free rolling straight and sliding rotational motion with respect to the side of the track 11a of the outer ring 11, In addition, with the trunnion 17a, the relative rotation and sliding linear motion are made possible with the help of the needle 13.

Due to this structure, it is possible to accurately transmit the rotational force from the outer ring 11 to the trunnion 17a, and also to perform the function smoothly at a predetermined power transmission angle, in the latter case, the spherical roller 12 ) Is subjected to slip resistance with respect to the track 11a of the outer ring 11.

On the other hand, in the above-described angle-adjustable roller constant velocity joint 20, the outer roller 22 is capable of rolling linear motion with respect to the side of the track 21a of the outer ring 21, and also the needle 23 and the inner roller 24 Relative rotation is possible with the help of.

The inner roller 24 and the trunnion 27a are capable of sliding straight line and sliding rotational motion due to the contact between the spherical surface of the trunnion 27a and the inner surface which is the plane of the inner roller 24.

Due to this structure, the rotational force from the outer ring 21 can be accurately transmitted to the trunnion 27a, and the function can be smoothly performed even at a predetermined power transmission angle.

However, the difference from the tripod constant velocity joint 10 is that the outer roller 22 performs only linear movement by rolling, not sliding, with respect to the track 21a of the outer ring 21 at a predetermined power transmission angle.

As described above, in the tripod constant velocity joint 10, a sliding resistance is generated between the spherical roller 12 and the track 11a of the outer ring 11 at the time of the power transmission angle. This causes the axial force to be generated, which causes lateral fluctuations in the vehicle, which in turn lowers the ride comfort of the vehicle.

In addition, even when the vehicle receives a torque load from the automatic transmission vehicle, the vibration of the engine is transmitted to the vehicle body without being absorbed by the axial sliding motion of the corresponding constant velocity joint 10 even when the vehicle stops, causing idling vibration. do.

On the other hand, the angle-adjustable roller constant velocity joint 20 is a form that improves the vehicle's NVH (Noise, Vibration, Harshness) characteristics by reducing the sliding resistance generated in the tripod constant velocity joint 10, and the outer roller 22 is It is possible to prevent the occurrence of axial force by reducing the sliding resistance only by the linear motion by the rolling on the contact surface with the outer ring (21).

However, in this improved angle-adjustable roller constant velocity joint 20, since the contact between the inner roller 24 and the trunnion 27a is made of one-point point contact, wear occurs in the corresponding parts during long-term use, resulting in durability. There is a problem that this is low.

In addition, as schematically shown in Fig. 3, as the contact point moves up and down when the action is applied, the action point load is eccentric in the center of the inner roller 24, and a moment is generated in the inner roller 24. There was a problem of causing the tilting of the inner roller 24 to lower the NVH characteristics of the vehicle.

The present invention was devised to solve the above problems, and has less axial force than conventional tripod constant velocity joints, which is advantageous for improving ride comfort, and also compared with conventional angle-adjustable roller constant velocity joints. Instead, the objective is to provide a reduced-force tripod constant velocity joint, which is advantageous for the service life and NVH characteristics of the vehicle by using a composite bearing.                         

The present invention for achieving the above object is a housing that delivers the rotational torque of the differential device, the inner ring having three tracks axially elongated at equal intervals in the circumferential direction and the rolling inside the track of the outer ring; Cylindrical outer roller which carries out linear motion and transmits the load from the outer ring inwardly by the contact, and the relative rotational movement of the outer roller and trunnion which are both counterparts and the load from the outer roller is transmitted inward by the contact. A roller bearing to help the roller, a spider integrally provided to extend the three trunnions having respective spherical outer diameters, respectively inserted into the roller bearing, and provided in an empty space between the roller bearing and the trunnion, The contact area is widened to spread the load evenly, and the roller bearing and the trunnion thread It provides a reduction of the axial type tripod constant velocity joint that includes a needle bearing clouds to help rotation.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

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

Figure 4 is a longitudinal cross-sectional view showing an axial force-reduced tripod constant velocity joint according to the invention, Figure 5 is a cross-sectional view taken along the line X-X of FIG.

The tripod constant velocity joint 30 according to the present invention is similar to the conventional angle-adjustable roller joint 20 which can reduce the generation of axial force, but is differentiated in that it has a single roller structure rather than a double roller structure. It is characterized in that the composite bearing structure of the roller bearing 33 and the needle bearing 34 is used to help uniform load transfer and relative rotation between the outer roller 32 and the trunnion 37a.

Its configuration is a housing that transmits the rotational torque of the differential device, the inner ring 31 of which three tracks 31a are formed long in the axial direction at equal intervals in the circumferential direction, and the rolling linear motion inside the outer ring 31. And a cylindrical outer roller 32 having a spherical outer diameter portion for transferring the load from the outer ring 31 to the roller bearing 33 to be described later by contact, and between the outer roller 32 and the trunnion 37a to be described later. The roller bearing 33 which assists the relative rotational movement and transmits the load from the outer roller 32 to the trunnion 37a by contact, and the radius to transfer the load from the roller bearing 33 to the axis connected to the center thereof. A spider 37 formed integrally with the three trunnions 37a having spherical outer diameters, each inserted into the track 31a of the outer ring 31 described above to extend in each direction, and a roller bearing 33; Empty ball between trunnions 37a It is provided in the subject to widen the contact area between each other so that the transmission load is widely dispersed and consists of a roller bearing 33 and the trunnions (37a), a needle bearing 34 to help cloud rotational movement between.

In addition, the housing for the alignment and assembly of the needle bearing 34 is provided with an integrated cage 35 to close the upper and lower parts of the needle bearing 34, and also to extend horizontally from the upper and lower inner side of the outer roller 32. The extended support part 32a is integrally formed to prevent the roller bearing 33 from being separated from the inner side thereof.

In addition, since the outer roller 32 is structurally advantageous in terms of suppressing axial force generation, it is advantageous to perform only rolling straight motion on the track 31a of the outer ring 31, so that the outer roller 32 is in close contact with the outer part on the upper and lower surfaces of the outer roller 32 for this purpose. Guide surface portion 31a-1 is integrally formed in the portion of the track 31a of the outer ring 31 so that the outer roller 32 can be smoothly rolled on the track 31a without tilting (that is, without tilting and swinging). Done.

Furthermore, in order to reduce frictional resistance between the outer roller 32 and the outer ring 31 during the rolling linear motion of the outer roller 32, the outer ring 31 and the outer roller 32 are not in contact with each other but in line contact with each other. It can be configured to allow grease to be supplied through a gap therebetween, wherein the point contact can be formed to make one or two point contact.

With the above-described configuration, the outer roller 32 always performs rolling straight motion without inclination on the track 31a of the outer ring 31, and the trunnion 37a having a spherical outer diameter portion has a roller bearing 33 and a needle. In the state surrounded by the bearing 34, the rotary motion by the sliding and rolling and the linear vertical movement of the sliding.

Therefore, the rotational force from the outer ring 31 can be accurately transmitted to the trunnion 37a, and the function can be smoothly performed even at a predetermined power transmission angle.

That is, the difference from the conventional tripod constant velocity joint 10 is that when there is a predetermined power transmission angle, the outer roller 32 only performs linear motion by clouds on the track 31a of the outer ring 31, It is the same as the conventional angle-adjustable roller constant velocity joint 20 in this respect, and it can reduce axial force generation by that much.

In addition, it is superior to the conventional angle-adjustable roller constant velocity joint 20, the durability of the service life is improved by uniform load transfer by using the composite bearing structure of the roller bearing 33 and the needle bearing 34, It is possible to improve the NVH characteristics of the vehicle by preventing the occurrence of moment.

In the foregoing description, it should be understood that those skilled in the art can make modifications and changes to the present invention without changing the gist of the present invention as merely illustrative of a preferred embodiment of the present invention.

According to the present invention, it is possible to prevent lateral fluctuation of the vehicle due to less generation of axial force, and even load transfer is possible, which improves the durability life as well as prevents generation of moment due to eccentricity, thereby improving the NVH characteristics of the vehicle. Effect can be achieved.

Claims (5)

A housing that transmits the rotating torque of the differential device, the inner ring having three tracks axially extended at equal intervals in the circumferential direction, A cylindrical outer roller which makes a rolling linear motion inside the track of the outer ring and transmits the load from the outer ring to the inside by contact; A roller bearing which transfers the load from the outer roller to the inner side by contact and assists the relative rotational movement of the outer roller and the trunnion as both sides of the product A spider which is integrally formed to extend the three trunnions having respective spherical outer diameters and inserted into the roller bearings, respectively; An axial force reduction type including a needle bearing provided in an empty space between the roller bearing and the trunnion to widen the contact area between the roller bearing and the trunnion so that the transfer load is widely distributed, and to help the rolling motion between the roller bearing and the trunnion. Tripod constant velocity joint. The method of claim 1, And a cage provided to close the upper and lower portions of the needle bearing for alignment and assembly of the needle bearing. The method according to claim 1 or 2, A reduced axial tripod constant velocity joint, characterized in that the guide surface portion is integrally formed on the track portion of the outer ring so as to be in close contact with the outer portion on the upper and lower surfaces of the outer roller so that the rolling roller linearly moves on the track without tilting the outer roller. . The method of claim 3, wherein The outer roller, An axial-force reduced tripod constant velocity joint, characterized in that the extension support is integrally formed so as to extend in the horizontal direction from the inner side upper and lower portions thereof to prevent the roller bearing from being separated. The method of claim 4, wherein A reduced force tripod constant velocity joint, characterized in that the grease is supplied through a gap formed in contact with each other in order to reduce the frictional resistance between the outer ring and the outer roller.

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