KR100614045B1 - Low vibration tripod-constant velocity joint - Google Patents

Abstract

The present invention relates to a low vibration tripod constant velocity joint of a dual roller type for a vehicle.

The present invention is a housing that transmits 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 straight and sliding rotational movement inside the track of the outer ring Cylindrical spherical roller which transmits the load from the outer ring to the inside by the contact, and cylindrical needle which transmits the load from the spherical roller to the inside by the contact and assists the relative rotational movement of the spherical rollers and the guide rings, which are both counterparts. And a cylindrical guide ring for rotating the inner side of the needle and transmitting the load from the needle inwardly, and inserted into the inner side of the guide ring to be in point contact with the guide ring through an outer diameter portion thereof. It is integrally provided to extend three trunnions, and performs the up and down straight line and rotational movements with respect to the guide ring. To support the spider and the spherical roller, the needles and the guide ring at the same time a spring ring which is provided so as to project in a horizontal direction through the inner surface of the spherical roller.

Therefore, the generation of axial force is less and the moment generation in the roller assembly is prevented to improve the NVH characteristics of the vehicle, the shape of the trunnion requires only minimal processing, thereby reducing the production cost.

Constant velocity, joint, tripod, double roller, low vibration, axial force

Description

LOW VIBRATION 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 low vibration tripod constant velocity joint of the dual roller method according to the present invention,

5 is a cross-sectional view taken along the line Y-Y 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: Double roller type low vibration tripod constant velocity joint

31: paddle 31a: track

32: spherical roller 33: needle

34: guide ring 34a: spherical protrusion

35: Springing 37: Spider

37a: trunnion

The present invention relates to a tripod constant velocity joint for a vehicle, and more particularly, has less axial force than a conventional tripod constant velocity joint, thereby preventing lateral fluctuation of the vehicle, and also compared to a conventional angle adjustable roller constant velocity joint. The present invention relates to a double roller type low vibration tripod constant velocity joint that can prevent the generation of moments and improve the vehicle's NVH characteristics.

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 the 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 even at a predetermined power transmission angle, and in the latter case (predetermined power transmission angle). In the case of), the spherical roller 12 is structurally subjected to sliding 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.

Furthermore, since the outer diameter portion of the trunnion 27a is spherical, there is also a problem in that the cost is increased due to the spherical processing of this portion, which increases the production cost.

The present invention was devised to solve the above-mentioned problems, and has less axial force than conventional tripod constant velocity joints, which is advantageous for improving ride comfort, and also compared to conventional angle-adjustable roller constant velocity joints. In addition, the aim of the present invention is to provide a double roller type low vibration tripod constant velocity joint that can reduce production cost in trunnion shape.

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 spherical roller which carries out linear and sliding rotational movement and transmits the load from the outer ring to the inside by contact, and transfers the load from the spherical roller to the inside by the contact, Cylindrical needle for helping relative rotational movement, the cylindrical guide ring for rotating the inner movement of the needle and transfers the load from the needle inward, and through the outer diameter portion which is respectively inserted into the inner side of the guide ring Integrally provided to extend three trunnions which are in point contact with the guide ring; Low vibration of the dual-roller type including a spider for vertical and linear movements and a spring ring which protrudes horizontally through the inner surface of the spherical roller to simultaneously support the spherical roller, the needle and the guide ring. Provides a tripod constant velocity joint.

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 a double-roller low vibration tripod constant velocity joint according to the present invention, Figure 5 is a cross-sectional view taken along the line Y-Y of FIG.

The low roller tripod constant velocity joint 30 of the dual roller type according to the present invention is similar to the conventional angle-controlled roller constant velocity joint 20 in that it has a double roller structure.

Its configuration is a housing which transmits the rotational torque of the differential device, the outer ring 31 of which three tracks 31a are formed long in the axial direction at equal intervals in the circumferential direction, and the rolling straight line and the outer ring 31 inside. Between the spherical roller 32 and the guide ring 34 to be described later, a cylindrical spherical roller 32 having a spherical outer diameter portion that performs a sliding rotational motion and transmits the load from the outer ring 31 to the needle 33 by contact. Cylindrical needle 33 which assists the relative rotational movement and transfers the load from the spherical roller 32 to the guide ring 34 by contact, and the trunnion 37a described below by contact with the load from the needle 33. Cylindrical guide ring 34 to be transmitted to each other and radially so as to transmit the load from the guide ring 34 to the axis connected to its center are respectively inserted into the track 31a of the outer ring 31 described above. All three trunnions 37a It consists of a spider (37) having.

And, to support the spherical roller 32 and the needle 33 and the guide ring 34 to form a roller assembly spring ring provided to protrude horizontally through the upper and lower inner surface of the spherical roller 32 ( 35).

Here, as shown in FIG. 5, a pair of spherical protrusions 34a are integrally formed on the inner surface of the guide ring 34 so as to face each other, thereby making point contact of the spherical plane with the trunnion 37a. Thus, the guide ring 34 and the trunnion 37a are configured to enable vertical reciprocating motion and relative rotational motion.

With this structure, the reaction force against the load transmitted to the trunnion 37a is always received at the center of the guide ring 34, so that the guide ring 34 is compared with the conventional angle-adjustable roller constant velocity joint 20. Moment generated by the eccentric load is reduced to improve the NVH characteristics of the vehicle.

In addition, even in the shape of the trunnion 37a, the contacting portion for the load transmission has a simple shape made of a flat surface instead of the existing spherical outer diameter portion, so that additional processing is extremely small, thereby reducing the production cost.

When explaining the operation, the spherical roller 32 performs the rolling straight and sliding rotational movement on the track (31a) of the outer ring 31 through the spherical outer diameter portion, but almost linear rolling movement, the guide ring 34 is a needle A relative rotational movement with the spherical roller 32 with the help of (33), the trunnion (37a) is a vertical straight line and a relative rotational movement while the point contact through the spherical projection (34a) of the guide ring 34, thereby The trunnion 37a can be tilted, while the spherical roller 32 remains parallel to the track 31a of the outer ring 31.

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.

In addition, the dual-roller low vibration tripod constant velocity joint 30 according to the present invention is basically the same as the conventional angle-adjustable roller constant velocity joint 20, and has a predetermined power compared to the conventional tripod constant velocity joint 10. Since the spherical roller 32 makes a linear motion by a cloud almost on the track 31a of the outer ring 31 at the transmission angle, there is an advantage that the generation of axial force is relatively small, thereby improving the riding comfort of the vehicle.

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, the generation of axial force is less and the moment generation in the roller assembly is prevented to improve the NVH characteristics of the vehicle, the trunnion shape is required only minimal processing can be achieved the effect of reducing the production cost have.

Claims (2)

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 spherical roller which performs rolling straight and sliding rotational movements inside the track of the outer ring and transmits the load from the outer ring inward by contact; Cylindrical needle which transmits the load from the spherical roller to the inside by the contact and helps the relative rotational movement of the spherical roller and the guide ring, which are both counterparts, A cylindrical guide ring which rotates inwardly of the needle and transmits a load from the needle inwardly; A spider which is inserted into the guide ring and is integrally provided to extend three trunnions which are in point contact with the guide ring through an outer diameter part thereof, the linear and linear movement of the guide ring; A dual-roller reduced axial tripod constant velocity joint including a spring ring provided to protrude in the horizontal direction through the inner surface of the spherical roller to simultaneously support the spherical roller, the needle and the guide ring. The method of claim 1, And a pair of spherical protrusions are formed on the inner surface of the guide ring so as to be in contact with each other through the spherical protrusions with respect to the trunnion.

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