KR101538577B1 - Cross groove joint - Google Patents

Abstract

The present invention relates to a cross groove joint, wherein the direction of a ball groove is inclined in the shape of a curve having a radius toward a joint vertical axis with a joint lengthwise axis as the standard and the radii of the ball grooves near each other are made to be in opposite directions, and which can reduce manufacturing cost by making it easy to make the shape of a ball groove in a forging process and can improve the strength of a cage. The cross groove joint of the present invention comprises: an outer race with a number of ball grooves formed on the internal surface; an inner race with a number of ball grooves formed on the external surface; a ball installed in between the ball groove of the outer race and the ball groove of the inner race; and a cage for constraining the ball. The ball groove of the outer race is inclined in the shape of a curve having a radius toward the joint vertical axis with the joint lengthwise axis as the standard, and the radii of the ball grooves near each other are formed to be in opposite directions.

Description

Cross groove joint < RTI ID = 0.0 >

The invention relates to a cross-groove joint, in which the direction of the ball groove is inclined in a curved shape with a radius with respect to the joint vertical axis with respect to the joint longitudinal axis, and the radius of the neighboring ball grooves is opposite The present invention relates to a cross groove joint capable of easily forming a ball groove shape in a forging process and thus capable of reducing manufacturing cost as well as improving the strength of a cage.

Generally, a joint is for transmitting rotational power (torque) to a rotation shaft having different angles of rotation axis. In the case of a propulsion shaft having a small power transmission angle, a hook joint or a flexible joint is used. In the case of a drive shaft having a large power transmission angle A constant velocity joint is used.

Since the constant velocity joint can transmit power smoothly at constant speed even when the angle of intersection between the drive shaft and the driven shaft is large, it is mainly used for the drive shaft of the independent suspension type. The transmission side (inboard side) is a tripod type constant velocity joint, Ball type constant velocity joints are mainly used, and wheel type (outboard side) is fixed type ball type constant velocity joint. The constant velocity joint of the transmission side (the inboard side) absorbs the displacement of the vehicle through the axial motion and the bending motion, and the constant velocity joint of the wheel side (outboard side) rotates by the steering angle of the wheel, .

The cross groove joint, which is a kind of the slide type ball type constant velocity joint, is applied only to the transmission side in the case of the drive shaft of the FF type front wheel drive vehicle. However, in the case of the drive shaft of the FR type rear wheel drive vehicle, .

The conventional cross groove joint has an outer race 1 'having a plurality of ball grooves formed on the inner surface and a plurality of ball grooves formed on the outer surface, as shown in Figs. 1 to 7 A ball 4 'provided between the ball groove of the outer race 1' and the ball groove of the inner race 2 'and the ball 4' provided between the inner race 2 ' And a cage 3 'for restraining the cage 3'.

Wherein the outer race (1 ') the ball grooves (11, _{1-11, 6)} relative to the joint longitudinal axis (X) a skew angle (+ α to the horizontal joint axis (Z)', -α ' ), And the skew angles (+ α ', -α') of adjacent ball grooves are made in opposite directions. That is, the ball grooves (11 _'1, 11' _3, 11 _'5), plus the skew angle (+ α') to have the ball grooves (11 _'2, 11' _4, 11, ₆₎ is a negative skew angle (- alpha ').

"Ball groove (21 ₁ to 21 wherein the inner race (2)"_"6) relative to the joint longitudinal axis (X) a skew angle (+ α to the horizontal joint axis (Z) ', -α' ), And the skew angles (+ α ', -α') of adjacent ball grooves are made in opposite directions. That is, the ball grooves (21 _'1, 21' _3, 21 _'5) is a negative skew angle (-α') has a ball in a groove (21 _'2, 21' _4, 21 _'6), plus the skew angle (+ alpha ').

The ball grooves 11 ' ₁ to 11' _{6 of} the outer race 1 'and the ball grooves 21' ₁ to 21 ' _{6 of} the inner race 2' (+ Alpha ', - alpha') in the opposite directions with respect to the reference angles ' ₁ to 4' ₆ .

The cage 3 'has an outer diameter 31' and an inner diameter 32 ', and a cage window 33' of the same number as the balls 4 ' ₁ to 4' ₆ is formed, structure in which the center of the _{'1-4' 6)} jeolgak always constrained to a plane view (4, _{1-4, 6)} to be located above, and by 1/2 of jeolgak amount of the inner race (2 ') .

The operational characteristics of the conventional cross-grove joint according to the above-mentioned configuration are self-centering so that the balls 4 ' ₁ to 4' ₆ are always positioned in the joint system plane B'-B ' A force is generated. This is because the skew angles of the ball grooves 11 ' ₁ to 11' _{6 of} the outer race 1 'and the skew angles of the ball grooves 21' ₁ to 21 ' _{6 of} the inner race 2' in three ball (4 _'1, 4, _3, 4 of the joint, ₅₎ the joint axis (X) direction component force (+ F'x) and three balls (4, _2, 4, _4, 4', ₆₎ Axis component (-F'x) is reversed and balanced.

Therefore, even if a cross groove joint, which is a type of slide type ball type constant velocity joint, is applied to both the transmission side and the wheel side of the drive shaft of the FR type rear wheel drive vehicle, the center of the joint can always be maintained without being biased to one side.

However, in the conventional cross-joint joint as described above, since the direction of the ball groove is twisted about the joint horizontal axis Z with respect to the joint longitudinal axis X, it is difficult to form the ball groove shape in the forging process In addition, the cage window 33 'must be enlarged in order to increase the length of movement of the ball in the cage window 33', thereby increasing the size of the cage window 33 ' 'Are reduced and the strength of the cage is lowered.

It is an object of the present invention to solve the above-mentioned problems of the prior art, in which the direction of the ball groove is inclined in a curved shape having a radius with respect to the vertical axis of the joint with respect to the longitudinal axis of the joint, In which a ball groove shape is easily formed in a forging process, thereby making it possible to reduce the manufacturing cost and to improve the strength of the cage.

In order to achieve the above object, the present invention provides a golf ball comprising: an outer race having a plurality of ball grooves formed on an inner surface; an inner race having a plurality of ball grooves formed on an outer surface; A ball disposed between the ball groove and the ball groove of the inner race and a cage for restraining the ball, wherein the ball groove of the outer race is formed on the joint vertical axis with reference to the longitudinal axis of the joint And the radii of the neighboring ball grooves are formed in opposite directions.

The outer race front offset center, which is the center of the radius of the outer race, is formed on the plane formed by H1, the joint vertical axis and the joint horizontal axis forward on the joint longitudinal axis from the center of the joint by V1 It is preferably formed at a distance away.

In the configuration of the present invention, the outer race rear offset center, which is the center of the radius of the outer race, is displaced by V2 on a plane formed by H2, joint vertical axis and joint horizontal axis rearward on the joint longitudinal axis from the center of the joint. It is preferably formed at a distance away.

The inner race rear offset center, which is the center of the radius of the inner race, is formed by U1 on the plane formed by I1, joint vertical axis and joint horizontal axis on the joint longitudinal axis from the center of the joint It is preferably formed at a distance away.

The configuration of the present invention is such that the inner race front offset center, which is the center of the radius of the above inner race, is offset from the center of the joint by U2 on the plane formed by I2, joint vertical axis and joint horizontal axis forward in the longitudinal axis of the joint It is preferably formed at a distance away.

According to the present invention, the ball groove of the outer race and the ball groove of the inner race have an outer race front offset center and an inner race rear offset center with respect to a ball disposed therebetween, and satisfy the following condition .

V1 = U1, H1 = I1

Here, V1 and U1 are distances on a plane formed by the joint vertical axis and the joint horizontal axis from the center of the joint, H1 is a distance away forward from the center of the joint on the axis in the longitudinal direction of the joint, I1 is a distance from the center of the joint, To the rear.

According to the present invention, the ball groove of the outer race and the ball groove of the inner race have an outer race front offset center and an inner race rear offset center with respect to a ball disposed therebetween, and satisfy the following condition .

V2 = U2, H2 = I2

Here, V2 and U2 are distances on a plane formed by the joint vertical axis and the joint horizontal axis from the center of the joint, H2 is a distance away from the center of the joint in the backward direction on the joint longitudinal axis, I2 is the distance from the center of the joint, The distance away from the front.

This invention is based on the fact that the direction of the ball groove is inclined in a curved shape with a radius with respect to the joint vertical axis in relation to the longitudinal axis of the joint and the radius of the adjacent ball grooves is in the opposite direction, So that the manufacturing cost can be reduced and the strength of the cage can be improved.

1 is a front view of a conventional cross groove joint;
2 is a sectional view taken along the line A'-A 'in Fig.
3 is a sectional view taken along the line B'-B 'in Fig.
4 is a sectional view taken along the line R'-R 'in Fig. 3;
5 is a view of R 'in Fig.
6 is a sectional view taken along the line L'-L 'in FIG.
7 is a view of L 'in FIG.
8 is a front view of a cross groove joint according to an embodiment of the present invention.
9 is a sectional view taken along line AA in Fig.
10 is a sectional view taken along line BB of Fig.
11 is a cross-sectional view taken along the line CC of Fig.
12 is a perspective view of an outer race of a cross groove joint according to an embodiment of the present invention.
13 is a perspective view of an inner race of a cross groove joint according to an embodiment of the present invention.
14 is a perspective view of a cage of a cross groove joint according to an embodiment of the present invention.
15 is a perspective view showing a direction of a ball force of a cross groove joint according to an embodiment of the present invention.
16 is a cross-sectional view of a cross groove joint according to an embodiment of the present invention.

Hereinafter, 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 carry out the present invention. Other objects, features, and operational advantages, including the purpose, operation, and effect of the present invention will become more apparent from the description of the preferred embodiments.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory only and are not to be construed as limiting the scope of the invention as disclosed in the accompanying claims. It is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities, many of which are within the scope of the present invention.

Also, terms and words used in the description and claims of the present invention are defined based on the principle that the inventor can properly define the concept of a term in order to explain its invention in the best way, And should not be construed as limited to only the prior art, and should be construed in a meaning and concept consistent with the technical idea of the present invention. For example, the terms relating to directions are set on the basis of the position represented on the drawing for convenience of explanation.

As shown in Figs. 8 to 16, the configuration of the cross groove joint according to an embodiment of the present invention includes: an outer race 1 having a plurality of ball grooves formed on an inner surface; An inner race 2 having a plurality of ball grooves, a ball 4 provided between the ball groove of the outer race 1 and the ball groove of the inner race 2, And a cage 3 for restraining the cage 3.

The ball grooves 11 ₁ to 11 ₈ of the outer race 1 are inclined in a curve shape having a radius R11 and R12 with respect to the joint vertical axis Y with reference to the joint longitudinal axis X And the radiuses R11 and R12 of the adjacent ball grooves are opposite to each other. That is, the ball grooves (11 _1, 11 _3, 11 _5, 11 ₇₎ has a radius (R11), the ball grooves (11 _2, 11 _4, 11 _6, 11 ₈₎ of the outer race front offset center (OR1) is And a radius R12 of the outer race rear offset center OR2.

The outer race front offset center OR1 which is the center of the radius R11 is displaced forward from the center of the joint O to H1 on the joint longitudinal axis X and to the joint vertical axis Y and the joint horizontal axis Z ) On the plane formed by the V1.

The outer race rear offset center OR2 which is the center of the radius R12 is displaced from the center of the joint O to H2 on the joint longitudinal axis X and to the joint vertical axis Y and the joint horizontal axis Z ) On the plane formed by the V2.

The ball grooves 21 ₁ to 21 ₈ of the inner race 2 are inclined in a curved shape having a radius R21 and R22 with respect to the joint horizontal axis Z with reference to the joint longitudinal axis X And the radiuses R21 and R22 of the adjacent ball grooves are opposite to each other. That is, the ball grooves 21 ₁ , 21 ₃ , 21 ₅ and 21 ₇ have the radius R21 of the inner race rear offset center IR1 and the ball grooves 21 ₂ , 21 ₄ , 21 ₆ and 21 ₈ And a radius R22 of the inner race front offset center IR2.

The inner race rear offset center IR1 which is the center of the radius R21 is located at a center of the joint axis O from the joint center O on the joint longitudinal axis X1 backward I1 and the joint vertical axis Y and the joint horizontal axis Z ) On the plane formed by the U1.

The inner race front offset center IR2 which is the center of the radius R22 has a center axis I2 on the joint longitudinal axis X from the joint center O and a joint vertical axis Y ) On the plane formed by U2.

The ball grooves 11 ₁ to 11 ₈ of the outer race 1 and the ball grooves 21 ₁ to 21 ₈ of the inner race 2 have balls 4 ₁ to 4 ₈ arranged therebetween (R11, R21) (R12, R22) of opposite offset centers from each other as a reference.

That is, the outer race front offset center OR1, which is the center of the radius R11, and the inner race rear offset center IR1, which is the center of the radius R21, satisfy the following condition.

V1 = U1, H1 = I1

Under this condition, the force -F in the direction of the joint longitudinal axis X of the ball has a negative direction.

 The outer race rear offset center OR2 which is the center of the radius R12 and the inner race front offset center IR2 which is the center of the radius R22 satisfy the following condition.

V2 = U2, H2 = I2

Under this condition, the force component (+ F) of the ball in the direction of the longitudinal axis (X) of the joint has a positive direction.

The operational characteristics of the cross groove joint according to an embodiment of the present invention are self-centering, and as shown in FIG. 15, the joint longitudinal axis X of the neighboring ball, (+ F, -F) of the balls 4 ₁ to 4 ₈ are generated so as to cross each other in opposite directions, so that the balls 4 ₁ to 4 ₈ are always forced to be positioned in the joint system plane B'-B ' do. Further, FIG. Jeolgak amount (Θ _C) of the cage (3) As shown in 16, is to jeolgak by 2/1 of jeolgak amount (Θ _i) of the inner race (2), the joint length of the cage (3) The amount of movement L _{C in the} direction of the directional axis X is shifted by 2/1 of the amount of movement L _i of the inner race 2 in the direction of the longitudinal axis X of the joint.

Therefore, even if the cross groove joint of the present invention, which is one kind of slide type ball type constant velocity joint, is applied to both the transmission side and the wheel side of the drive shaft of the FR type rear wheel drive vehicle, do.

1. 1 ': outer race 2, 2': inner race
3, 3 ': Cage 4: Ball

Claims (7)

An outer race having a plurality of ball grooves formed on an inner surface thereof,
An inner race having a plurality of ball grooves formed on an outer surface thereof,
A ball provided between the ball groove of the outer race and the ball groove of the inner race,
And a cage for restraining the ball,
Wherein the ball groove of the outer race is formed in a curved shape having a first radius with respect to the center of the outer race front offset and the neighboring ball grooves are formed in a curved shape having a second radius with respect to the center of the rear race offset of the outer race,
The outer race front offset center is formed at a distance V1 on the plane formed by the joint vertical axis and the joint horizontal axis from the center of the joint by H1 forwardly on the joint longitudinal axis from the center of the joint,
The outer race rear offset center is formed at a distance V2 on the plane formed by the joint vertical axis and the joint horizontal axis by H2 from the center of the joint to the rear axis on the joint longitudinal axis,
Wherein the ball groove of the inner race is formed in a curved shape having a third radius with respect to the center of the inner race front offset and the neighboring ball grooves have a curved shape having a fourth radius with respect to the center of the inner race rear offset,
The inner race rear offset center is formed at a distance U1 on the plane formed by the joint vertical axis and the joint horizontal axis from the center of the joint by I1 backward from the center of the joint on the longitudinal axis of the joint from the center of the joint,
Characterized in that said inner race front offset center is formed at a distance U2 away from the center of the joint by a distance I2 forwardly in the longitudinal axis of the joint from the center of the joint to a plane defined by the joint vertical axis and joint horizontal axis Cross groove joint. delete delete delete delete The method according to claim 1,
The ball groove of the outer race and the ball groove of the inner race have an outer race front offset center and an inner race rear offset center with respect to a ball disposed therebetween,
The V1 and the U1 have the same length, and the H1 and the I1 have the same length. The method according to claim 1,
The ball groove of the outer race and the ball groove of the inner race have an outer race rear offset center and an inner race front offset center with respect to a ball disposed therebetween,
The length of V2 and the length of U2 are the same, and the length of H2 and the length of I2 are the same.

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