KR200302670Y1 - Tripford-type constant velocity joint - Google Patents

Abstract

The present invention relates to a tripod constant velocity joint, which is a conventional tripod constant velocity joint in which the tension and compression force is periodically axially applied to the propulsion shaft at any joint angle when the spherical roller is driven along the track groove of the housing. In the present invention, there is a problem in that vibration occurs due to a vibration force that vibrates the vehicle from side to side in a sudden driving condition of the vehicle. The present invention provides a spherical roller by providing a flat portion with a predetermined width on the track groove of the housing. Since the turning motion is possible from the track groove to the joint joint angle, the axial resistance can be prevented and the spherical roller contacts the housing track surface at three points even at angles above the joint joint angle (the range from θ ₁ to θ). As a result, the resistance decreases, and the rolling resistance decreases when turning due to the contact between the plane and the sphere. Tripod is a constant velocity joint to reduce the rolling resistance of the vehicle so as not to generate lateral vibration of the vehicle.

Description

Tripod Constant Velocity Joint

The present invention relates to a tripod constant velocity joint, and more particularly, to reduce the axial force generation to reduce the lateral vibration of the vehicle and to control the rolling direction of the spherical roller and the cylindrical roller. (Tripod) relates to a constant velocity joint.

The constant velocity joint is used to transfer power to the wheels in the front wheel drive or four-wheel drive in the drive axle connected to the longitudinal deceleration device. It has the property of transmitting power at constant speed.

In general, the constant velocity joint is composed of a sliding joint, a shaft, and a fixed joint. The sliding joint is used to absorb the X, Y displacement of the vehicle and is a tripod ( tripod type, double offset type, cross groove type, and the like, the above-mentioned fix joint is for absorbing the steering angle of the vehicle, and is a Rzeppa type, a birfield. Brother.

For reference, the above description of the tripod constant velocity joint is described in "Triford type constant velocity joint" of Korean Utility Model Registration Application No. 94-34877 (filed December 21, 1994), or No. 95-20348 ( Filed: "Triford-type constant velocity joints" of August 7, 1995) or "Triford-type constant velocity joints" of Application No. 95-20349 (filed August 7, 1995), or 95-20350 Filed: "Triford type constant velocity joint" of August 7, 1995) or "Triford type constant velocity joint" of Application No. 95-2035l (filed August 7, 1995), or 95-20352 Filed: "Triford type constant velocity joint" of August 7, 1995) or "Triford type constant velocity joint" of Application No. 95-20353 (filed August 7, 1995), or 95-2l668 Filed: "Triford type constant velocity joint" of August 22, 1995) or "Triford type constant velocity joint" of Application No. 95-21669 (filed August 7, 1995), or 95-2l670 Filed under: "Triford-type constant velocity joints" by August 7, 1995 It has a bar.

Conventional tripod constant velocity joints include a spider assembly having three track grooves having an axial guide surface on an inner surface thereof, a spider assembly having three triions inserted into the track grooves of the housing, and a triion of the spider assembly. And a spherical roller that is rotatably fastened to the front end, and a needle roller inserted between the inner surface of the spherical roller and the outer surface of the triion so as to be rotatable in the track groove of the housing.

In the conventional tripod type constant velocity joint having such a structure, as shown in FIG. 3, when the spider assembly is given an arbitrary joint angle θ, the contact between the spherical roller 3 and the track track of the housing 1 is provided. Moves from the point A (contact point with the spherical roller track groove at the joint angle (θ = 0 °)) to the Al point (contact point with the spherical roller track groove at the joint angle (θ)). When the joint angle is F (see Fig. 1), the load applied to the track groove at the joint center (O) is F (see Fig. 1), the axial component force due to the contact movement at any joint angle (θ) is Fsinθtan. (Where θ: joint angle, Contact angle between the track groove and the spherical roller) acts as an axial force. In addition, since the spherical roller 3 ascends a gradient having a certain inclination angle β according to the contact movement, the axial component force of F tan β is further generated. That is, when an arbitrary joint angle θ is given, the resistance in the axial direction is F (sinθtan Tanβ).

However, in the conventional tripod constant velocity joint having the above-described structure, when the spherical roller is driven along the track groove of the housing, tensile and compressive forces are periodically generated in the axial direction at an arbitrary joint angle in the axial direction. To act as a vibration force to vibrate the vehicle from side to side in the sudden driving conditions, there was a problem that causes vibration in the vehicle causing the driver's anxiety and discomfort.

An object of the present invention is to solve such a conventional problem, and to reduce the axial force generation to reduce the lateral vibration of the vehicle, and to control the rolling direction of the spherical and cylindrical rollers, In providing.

1 is a cross-sectional view of the main portion showing the configuration of the tripod constant velocity joint according to the first embodiment of the present invention

2 is a cross sectional view of the main part of FIG.

3 is a view for explaining a turning state of a general tripod constant velocity joint

4 is a view for explaining a turning state of the tripod constant velocity joint according to the first embodiment of the present invention.

(A) (b) (c) of FIG. 5 is a sectional view showing the main parts of the housing of the tripod constant velocity joint according to the first embodiment of the present invention.

6 is a cross-sectional view of the main portion showing the configuration of the tripod constant velocity joint according to the second embodiment of the present invention

7 is a main cross-sectional view of FIG. 6

(A) and (b) of FIG. 8 are a cross-sectional view and a plan view of an outer roller of the tripod constant velocity joint according to the second embodiment of the present invention.

9 is a cross-sectional view illustrating a state in which a spherical roller is coupled to an outer roller of a tripod constant velocity joint according to a second embodiment of the present invention.

10 is a cross-sectional view of the main portion showing the configuration of the tripod constant velocity joint according to the third embodiment of the present invention

11 is a main cross-sectional view of FIG. 10

12 is a cross-sectional view of the main portion showing the configuration of the tripod constant velocity joint according to the fourth embodiment of the present invention

13 is a sectional view of main parts of FIG.

14 is a cross-sectional view of a spherical roller according to an embodiment of the present invention

Explanation of symbols on the leading part of the drawing

1-Housing 2-Spider Assembly

3-Spherical Rollers 4-Needle Rollers

5-Striker Out 6-Retainer Ring

DETAILED DESCRIPTION Hereinafter, the most preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. .

As shown in FIG. 1 and FIG. 2, the tripod constant velocity joint according to the first embodiment of the present invention has three track grooves 8 having a curved guide surface therein at equal intervals in the axial direction. A housing 1 is formed, and three triions are formed to protrude so as to be inserted into the track groove 8 of the housing 1, and a spherical roller 3 is installed on the triion, and the spherical roller 3 is In a tripod constant velocity joint consisting of a spider assembly (2) comprising a needle roller (4) installed to enable rolling motion when moving axially along a track groove (8), the track groove of the housing (1) (8) characterized in that the plane is formed by a certain width (L), and the spider assembly (2) is positioned so as to be positioned on the center of the spherical roller (3) thereon.

A striker out (5) is provided to prevent the needle roller (4) and the spherical roller (3) from escaping on the triion, and the retainer ring (6) supporting the striker out (5) is provided with a trini It is coupled to the frozen tip.

Since the spherical roller 3 is secured in a circumferential direction by a certain width ℓ so that it can be rotated in a circumferential direction to a certain angle θ ₁ , that is, a commercial joint angle, By securing a plane of (l), the spider assembly 2 only turns from section B to section B _l , or from section B to section B _l when given an arbitrary joint angle θ as shown in FIG. Swivel movements up to and linear axial movements from B _l to B ₂ are possible. Where l is the planar part length, θ is the joint angle, θ ₁ is the commercial joint angle, B is the contact point with the track surface of the spherical roller 3 at the joint angle θ = 0 °, and B _l is the commercial joint angle (θ _1). ), The contact point with the track groove 8 of the spherical roller 3, B ₂ denotes the contact point with the track groove 8 of the spherical roller 3 at the joint angle θ, respectively.

In addition, the size of the plane portion of the constant width (l) includes the case where it is in the region of 0 <l ≤ RR (1-cosθ + (1-cosθ) / cosθ), and in particular, the common joint angle θ is The size of 1 in the case of 16 ° is preferable.

In the above, when the size of l is set to the upper end portion L ₁ and the lower portion L ₂ relative to the center, ego, It includes a shape such that L = L ₁ + L ₂ . Here, L: plane part length, θ: joint angle, RR: PCD radius of the tripod joint.

5 (a) and 5 (b) show various embodiments of the track groove 8 of the housing 1 according to the first embodiment of the present invention. The curved surface (R) equal to the curved surface (R) of the spherical roller (3) on the basis of the O ₁ 'and O ₂ ' point offset in the plane and the center of the predetermined width (ℓ) in the center of the track groove (B) of FIG. 5 is an inclination angle based on the O ₁ 'and O ₂ ' points offset from the plane and the center of a predetermined width (l) in the center portion of the track groove (8). (a) of FIG. 5 is based on the O ₁ 'and O ₂ ' points offset from the center and the plane of a predetermined width (l) in the center portion of the track groove (8) The curved surface R which is identical to the curved surface R of the spherical roller 3 is formed at the point O '.

6 to 9 are views showing a second embodiment of the present invention, wherein an outer roller 7 is inserted between the inner surface of the housing 1 and the spherical roller 3, and the outer roller 7 of FIG. As shown in (a) (b) of FIG. 8, both the outer surface and the inner surface are formed as spherical surfaces, and as shown in FIG. 9, the inner surface is an ellipse so that the spherical roller 3 can be assembled to the outer roller 7. a, b), or other non-circular complex shape (a ≠ b).

10 and 11 show a third embodiment of the present invention, wherein the outer shape of the spherical roller 3 is formed of three curved surfaces R ₁ , R ₂ , and R _{3 at} joint angles equal to or greater than a commercial joint angle. Three arbitrary curved surfaces were formed to allow for three-point contact.

12 and 13 illustrate a fourth embodiment of the present invention. In the second embodiment in which the outer roller 7 is coupled, the outer surface shape of the outer roller 7 is three curved surfaces R ₁ and R. ₂ , R ₃ ) to form three curved surfaces to be three-point contact at the joint angle or more than the normal angle.

In the above, to improve the durability of the outer roller (7) and the spherical roller (3) can be carburized, or the surface can be coated by surface treatment.

The tripod constant velocity joint according to the embodiment of the present invention configured as described above has a predetermined width l formed on the track groove 8 so that a predetermined joint angle θ is shown as shown in FIG. 4. ₁ ) up to the rotational movement around the radius (RR) and the θ ₁ to θ in the axial direction linear motion as in the prior art, the direction control of the spherical roller (3) at a commercial joint angle is the rotational movement Is possible.

According to the tripod type constant velocity joint of the present invention, as described above, the spherical roller can be pivoted from the track groove to the commercial joint angle by providing a flat portion with a predetermined width on the track groove of the housing. The spherical roller has a three-point contact with the housing track surface even at angles above the common joint angle (the range from θ _{1 to} θ θ), and the resistance decreases.The rolling resistance decreases during turning due to the contact between the plane and the sphere. The rolling resistance of the roller itself is also reduced.

Claims (9)

Three track grooves having a curved guide surface therein are formed in the housing 1 formed at equal intervals in the axial direction, and three triions are formed to protrude so as to be inserted into the track grooves of the housing 1. A spherical roller (3) is provided, and the spherical roller (3) consists of a spider assembly (2) comprising a needle roller (4) installed to enable rolling motion when the spherical roller (3) moves axially along the track groove. In constant velocity joints, A flat width 1 is formed at the center of the track groove of the housing 1 by a predetermined width, and the spider assembly 2 is positioned on the center of the spherical roller 3 thereon. The size of the planar portion of s) is in the range 0 <1 ≤ RR (1-cos θ + (1-cos θ) / cos θ), and in the above formula, the size of 1 when the common joint angle θ is 16 ° Tripod type constant velocity joint, characterized in that it comprises a. According to claim 1, wherein the size of 1 when the upper portion l ₁ and the lower portion l ₂ relative to the center, ego, Tripod-type constant velocity joint, characterized in that it comprises a shape such that l = l ₁ + l ₂ . The center surface of the track groove is the same as the spherical roller (3) of the spherical roller (3) on the basis of the O ₁ 'and O ₂ ' point offset from the plane and the center of the predetermined width (1) in the center portion of the track groove Tripod type constant velocity joint, characterized in that to form a curved surface (R). According to claim 1, characterized in that the inclination angle (α) is formed on the basis of O ₁ 'and O ₂ ' offset from the plane and the center of the predetermined width (1) in the central portion of the track groove Tripod constant velocity joint. According to claim 1, wherein the center of the track groove is the same as the spherical roller (R) (3) the spherical roller (3) on the basis of the O ₁ 'and O ₂ ' point offset from the plane and the center of a predetermined width (l) Tripod type constant velocity joint, characterized in that the curved surface (R) is formed at the O 'point. According to claim 1, wherein the outer roller (7) is inserted between the inner surface and the spherical roller (3) of the housing (1), the outer roller (7) both the outer surface and the inner surface is formed as a spherical surface, the outer Tripod type constant velocity joint, characterized in that the inner surface of the roller (7) is formed of ellipses (a, b). According to claim 1, characterized in that the outer surface shape of the spherical roller (3) is formed of three curved surfaces (R _l , R ₂ , R ₃ ) to be three-point contact at a joint angle of more than a common angle Tripod constant velocity joint. The method of claim 6, wherein the outer surface of the outer roller (7) is formed of three curved surfaces (R _l , R ₂ , R ₃ ) to be a three-point contact at the joint angle or more than the commercial joint angle Tripod constant velocity joint. 7. The tripod constant velocity joint according to claim 6, wherein the outer roller (7) and the spherical roller (3) are carburized with carbon in order to improve the durability, or the surface is coated by surface treatment.