Symmetric double offset constant velocity joint

Abstract

The present invention relates to a symmetric double offset constant velocity joint and, specifically, to a symmetric double offset constant velocity joint in which an outer race track and an inner race track are each doubly offset with respect to a joint center and have center points that are symmetrical with each other, and thus the depth to which each of the tracks surrounds a ball is increased to prevent track deformation. Provided is a symmetric double offset constant velocity joint comprising: an outer race having an outer race track formed on the inner surface; an inner race having an inner race track formed on the outer surface; a ball disposed between the outer race and the inner race; and a cage disposed between the outer race and the inner race to support the ball, wherein the outer race track includes an outer race straight track, an outer race outer curved track formed outside the outer race straight track, and an outer race inner curved track formed inside the outer race straight track, and the inner race track includes an inner race straight track, an inner race outer curved track formed outside the inner race straight track, and an inner race inner curved track formed inside the inner race straight track.

Description

Symmetric double offset constant velocity joint

[0001] The present invention relates to a symmetrical double offset constant velocity joint, and more particularly, to a symmetrical double offset constant velocity joint in which an outer ring track and an inner ring track are each doubly offset with respect to a joint center and have mutually symmetrical center points, thereby increasing the depth at which each track surrounds a ball and preventing track deformation.

[0002] In general, a constant velocity joint is used to transmit rotational power (torque) to axles with different angles of rotation. For a propulsion shaft with a small power transmission angle, a hook joint or flexible joint is used, and for a drive shaft of a front-wheel drive vehicle with a large power transmission angle, a constant velocity joint is used.

[0003] Constant velocity joints are mainly used in the axle shafts of front-wheel drive vehicles with independent suspension because they can smoothly transmit power at a constant velocity even when the intersection angle between the driving shaft and the driven shaft is large. The engine side (inboard side) centered on the shaft is made of a tripod-type constant velocity joint, and the tire side (outboard side) centered on the shaft is made of a ball-type constant velocity joint.

[0004] The configuration of a ball-type constant velocity joint installed on the wheel side (outboard side) with the shaft as the center, as shown in Korean Patent Publication No. 10-2011-0125107, comprises a shaft that rotates by receiving the rotational power of a tripod-type constant velocity joint, an inner ring connected to one end of the shaft, an outer ring installed on the outside of the inner ring, a plurality of balls for transmitting the power to the outer ring, a cage for supporting the balls, a sensor ring installed on the outside of the outer ring, a boot connected at one end to the shaft and at one end to the outer ring, and a clamping band for fixing the boot.

[0005] The ball-type constant velocity joint of a conventional vehicle is structured so that a cage and an inner ring fix the ball, and the ball moves within a groove formed longitudinally on the inner surface of the outer ring according to steering.

[0006] However, with the recent introduction of electric vehicles, the required driving torque has increased, and in vehicles that require constant velocity joints capable of high angles during full turn, there has been a problem of track deformation occurring in high angle situations, resulting in abnormal noise caused by contact with the inner / outer diameter of the cage.

[0007] As illustrated in Fig. 13, the PCD trajectory of the inner ring track based on the joint center has a straight line shape inside the vertical line passing through the center point of the inner ring track, and a curved shape outside the vertical line.

[0008] And, the PCD trajectory of the outer ring track has a straight shape outside the vertical line passing through the center point of the outer ring track, and a curved shape outside.

[0009] And, as illustrated in Fig. 14, with respect to the joint center point located on the outer ring center axis line, the center of the outer ring track is offset horizontally by a first distance further outward from the joint center, and the center of the inner ring track is offset horizontally by a first distance further inward from the joint center.

[0010] In this structure, when a high angle (e.g., 47 degrees) is implemented, there was a problem that deformation occurred on the inside of the outer ring (outer ring track curved section) or on the inside of the inner ring (inner ring track straight section), as shown in Fig. 15.

[0011] The present invention has been made to solve such problems, and its purpose is to provide a symmetrical double-offset constant velocity joint in which the outer ring track and the inner ring track are each doubly offset with respect to the constant velocity joint center and have mutually symmetrical centers, thereby increasing the depth at which each track surrounds the ball and preventing track deformation.

[0012] In addition, the present invention has another purpose of providing a symmetrical double offset constant velocity joint that can increase the travel distance of balls in the track and increase the amount of angular contact of the constant velocity joint while reducing abnormal noise and backlash by having the inner ring track and the outer ring track tilted at a skew angle that is tilted at a certain angle with respect to the central axis of the constant velocity joint and intersecting the inner ring track and the outer ring track in a cross groove type.

[0013] The present disclosure provides an outer ring having an outer ring track formed on the inner surface thereof;

[0014] An inner ring having an inner ring track formed on the outer surface;

[0015] A ball disposed between the outer ring and the inner ring;

[0016] Including a cage that is placed between the outer ring and the inner ring and supports the ball,

[0017] The above outer ring track includes an outer ring straight track, an outer ring outer curved track formed on the outside of the outer ring straight track, and an outer ring inner curved track formed on the inside of the outer ring straight track.

[0018] The inner ring track includes an inner ring straight track, an inner ring outer curved track formed on the outside of the inner ring straight track, and an inner ring inner curved track formed on the inside of the inner ring straight track.

[0019] The center point of the outer ring outer curve track, the center point of the outer ring inner curve track,

[0020] The present invention provides a symmetrical double offset constant velocity joint, characterized in that the center point of the inner ring outer curved track and the center point of the inner ring inner curved track are arranged on an offset eccentric axis line that is a first distance vertically apart from the center axis of the outer ring.

[0021] The present disclosure provides a symmetrical double offset constant velocity joint in which the outer ring straight track is arranged to face the inner ring outer curved track and the inner ring straight track is arranged to face the outer ring inner curved track, while the joint is not cut.

[0022] In the present disclosure, the joint center point is located on the outer ring center axis,

[0023] The joint center point is defined as the center point of an imaginary constant velocity plane formed by the center points of the balls, and the center point of the inner curved track of the outer ring is characterized in that it has a horizontal offset of a first distance in the horizontal direction outward from the joint center point and a vertical offset of a first distance in the vertical direction in the opposite direction of the outer ring track.

[0024] In the present disclosure, the center point of the outer ring outer curved track is;

[0025] It is characterized in that it has a horizontal offset of a first distance in the horizontal direction outward on the offset eccentric axis line with respect to the center point of the inner curved track of the outer ring.

[0026] In the present disclosure, the joint center point is located on the outer ring center axis,

[0027] The center point of the inner ring outer curved track is characterized in that it has a horizontal offset of a first distance inward in a horizontal direction with respect to the joint center point and a vertical offset of a first distance in a vertical direction in the opposite direction of the inner ring track.

[0028] In the present disclosure, the center point of the inner ring inner curved track is spaced apart from the center point of the inner ring outer curved track by a horizontal offset of a first distance inward on the offset eccentric axis line.

[0029] In the present disclosure, the arrangement section of the inner ring straight track corresponds to the section between the center point of the inner ring outer curved track and the center point of the inner ring inner curved track, and its length is equal to the first distance, and the arrangement section of the outer ring straight track corresponds to the section between the center point of the outer ring outer curved track and the center point of the outer ring inner curved track, and its length is equal to the first distance.

[0030] According to the present invention, the overall amount of the track covering the ball is increased, thereby increasing the robustness of the track compared to the prior art, and thereby suppressing deformation of the track.

[0031] Therefore, there is an advantage in that contact with the cage and joint occurrence caused by deformation of the track can be prevented.

[0032] Figure 1 is an exploded perspective view of the first embodiment of the present invention.

[0033] Figure 2a is a diagram of the internal structure of the outer ring in the first embodiment of the present invention.

[0034] Figure 2b is a side cross-sectional view of the outer ring in the first embodiment of the present invention.

[0035] Figure 3a is a diagram of the external structure of the inner ring in the first embodiment of the present invention.

[0036] Figure 3b is a side cross-sectional view of the inner ring in the first embodiment of the present invention.

[0037] Figure 4 is a side cross-sectional view showing a constant velocity joint according to the first embodiment of the present invention in a state in which it is not cut.

[0038] Figure 5 is an enlarged cross-sectional view of Figure 4.

[0039] Figure 6 is a side cross-sectional view showing the shapes of the inner and outer rings and the relative positions between their respective center points in a constant velocity joint according to the first embodiment of the present invention.

[0040] Figure 7 is a detailed cross-sectional view showing the positions of each center point in the first embodiment of the present invention.

[0041] FIG. 8 is a schematic diagram of an inner curved track, a straight track, an outer curved track, and an inner curved track center point and an outer curved track center point in a first embodiment of the present invention.

[0042] Figure 9 is a schematic diagram showing the arrangement between the ball and the track.

[0043] Figure 10 is a cross-sectional view of the first embodiment of the present invention in a state where the angle is cut as much as possible in the IN direction (+).

[0044] Figure 11 is a cross-sectional view of the first embodiment of the present invention cut to the maximum angle in the OUT direction (-).

[0045] Figure 12 is a side cross-sectional view showing the state of the inner ring track and the outer ring track in the prior art.

[0046] Figure 13 is a detailed side cross-sectional view showing the relative positions and offsets of the center point of the inner ring track and the outer ring track with respect to the center point of the constant velocity joint in the prior art.

[0047] Figure 14 is a schematic diagram showing an area that appears vulnerable when cutting a joint in a conventional technology.

[0048] Figure 15 is an exploded perspective view of a second embodiment of the present invention.

[0049] Figure 16 is a diagram of the internal structure of the outer ring of the second embodiment of the present invention.

[0050] Figure 17 is a side cross-sectional view of the outer ring of the second embodiment of the present invention.

[0051] Figure 18 is a diagram of the external structure of the inner ring of the second embodiment of the present invention.

[0052] Figure 19 is a side view of the inner ring of the second embodiment of the present invention.

[0053] Figure 20 is a side cross-sectional view of the inner ring of the second embodiment of the present invention.

[0054] Figure 21a illustrates the shape of the outer ring track according to the outer ring track skew angle in the second embodiment of the present invention.

[0055] Figure 21b illustrates the shape of the inner ring track according to the inner ring track skew angle in the second embodiment of the present invention.

[0056] Figure 22 is a side cross-sectional view showing a state in which a constant velocity joint is not cut in the second embodiment of the present invention.

[0057] Figure 23 is an enlarged cross-sectional view of Figure 22.

[0058] Figure 24 is a front view of a constant velocity joint according to a second embodiment of the present invention.

[0059] Figure 25a is a side perspective view showing the shape of the track of a constant velocity joint when there is no skew angle.

[0060] Figure 25b is a side cross-sectional view showing the shape of the track of a constant velocity joint when there is no skew angle.

[0061] Figure 25c is a front view showing the shape of the track of a constant velocity joint when there is no skew angle.

[0062] Figure 26a is a side perspective view showing the shape of the track of a constant velocity joint when there is a skew angle.

[0063] Figure 26b is a side cross-sectional view showing the shape of the track of a constant velocity joint when there is a skew angle.

[0064] Figure 26c is a front view showing the shape of the track of a constant velocity joint when there is a skew angle.

[0065] Figure 27 is a side cross-sectional view showing the shapes of the inner and outer rings and the relative positions between their respective center points in a constant velocity joint according to a second embodiment of the present invention.

[0066] Figure 28 is a detailed cross-sectional view showing the positions of each center point in the second embodiment of the present invention.

[0067] Figure 29 is a schematic diagram of an inner curved track, a straight track, an outer curved track, and an inner curved track center point and an outer curved track center point in a second embodiment of the present invention.

[0068] Figure 30 is a cross-sectional view of the second embodiment of the present invention cut to the maximum angle in the IN direction (+).

[0069] Figure 31 is a cross-sectional view of the second embodiment of the present invention cut to the maximum angle in the OUT direction (-).

[0070] The present invention can have various modifications and embodiments, and specific embodiments are illustrated and described in the drawings.

[0071] However, this is not intended to limit the present invention to a specific embodiment, but should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

[0072] Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by the terms.

[0073] The above terms are used solely to distinguish one component from another.

[0074] For example, without departing from the scope of the present invention, the second component may be referred to as the first component, and similarly, the first component may also be referred to as the second component.

[0075] The term and / or includes any combination of a plurality of related described items or any one of a plurality of related described items.

[0076] When it is said that a component is "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but there may also be other components in between.

[0077] On the other hand, when it is said that a component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0078] The terminology used in this application is for the purpose of describing specific embodiments only and is not intended to limit the present invention.

[0079] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0080] In this application, terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but should be understood not to exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0081] Hereinafter, embodiments will be described in detail with reference to the attached drawings. Regardless of the drawing numbers, identical or corresponding components are given the same reference numbers, and redundant descriptions thereof will be omitted.

[0082] As illustrated in FIG. 1, the configuration of the constant velocity joint according to the first embodiment of the present invention includes an outer ring (100) having a cup portion (101) and connected to a shaft (102) that transmits rotational force to a wheel of a vehicle, an inner ring (200) provided inside the outer ring, a plurality of balls (300) provided between the outer ring and the inner ring (200), and a cage (400) that supports the balls (300) and helps the balls (300) maintain a constant velocity plane.

[0083] In Figure 1, six balls (300) are illustrated, but the quantity is not limited to this.

[0084] On the inner surface of the cup (101), a number of outer ring tracks (110) corresponding to the number of balls are provided.

[0085] In addition, an inner ring track (210) corresponding to the number of balls and facing each outer ring track (110) is provided on the outer surface of the inner ring (200).

[0086] The cage (400) is provided with a window (401) into which each ball (300) is inserted, and when the joint is cut, the constant velocity plane of the ball (300) can be maintained by the cage (400).

[0087] As shown in FIGS. 2a and 2b, the inner surface of the outer ring (100) is open so that the outer ring track (110) faces outward from the cup portion (101). The outer ring track (110) has a lateral cross-section formed in a straight shape.

[0088] The outer ring track (110) includes an outer ring straight track (111), an outer ring outer curved track (112), and an outer ring inner curved track (113).

[0089] The outer ring outer curved track (112) is formed on the outside of the outer ring straight track (111) and is formed in a curved shape that is slightly inclined downward toward the outside.

[0090] The outer ring inner curved track (113) is formed on the inside of the outer ring straight track (111) and is formed in a downwardly inclined curved shape toward the inside of the cup portion (101).

[0091] It is preferable that the length of the outer ring inner curved track (113) be formed longer than that of the outer ring outer curved track (112).

[0092] It is preferable that the outer ring straight track (111) be configured as a horizontal straight track arranged in a horizontal direction when the constant velocity joint is not cut.

[0093] As shown in FIGS. 3a and 3b, the outer surface of the inner ring (200) is entirely open with the inner ring track (210) facing outward from the cup portion (101).

[0094] The inner ring track (210) includes an inner ring straight track (211), an inner ring outer curved track (212), and an inner ring inner curved track (213).

[0095] The inner ring straight track (211) has a lateral cross-section that is formed in a straight shape.

[0096] The inner ring outer curved track (212) is formed on the outside of the inner ring straight track (211) and is formed in the shape of a curved surface that slopes downward toward the outside.

[0097] The inner ring inner curved track (213) is formed on the inside of the inner ring straight track (211) and is formed in a curved shape that is slightly inclined downward toward the inside of the cup portion (101).

[0098] It is preferable that the length of the inner ring outer curved track (212) be formed longer than that of the inner ring inner curved track (213).

[0099] A shaft insertion hole (220) is provided at the center of the inner ring (200), and a circlip groove (221) is provided on the inner surface of the shaft insertion hole (220) into which a circlip for fixing the shaft (500) and the inner ring (200) is fitted.

[0100] It is preferable that the inner ring straight track (211) be configured as a horizontal straight track arranged in a horizontal direction when the joint is not cut.

[0101] As shown in FIGS. 4 and 5, when compared with the vertical line of the rotation center of the virtual constant velocity plane implemented by the center points of the balls, i.e., the vertical center (C1) of the joint in a non-cut state, the outer ring straight track (111) is located outside the cup portion (101) relative to the vertical center (C1) of the joint, and the inner ring straight track (211) is located inside the cup portion (101) relative to the vertical center (C1) of the joint.

[0102] And, in a state where the angle is not cut, the virtual line formed by the vertical center (C1) of the joint is placed on the outer ring inner curve track (113) and the inner ring outer curve track (212).

[0103] And, in a state where the joint is not cut, the outer ring straight track (111) is arranged to face the inner ring outer curved track (212), and the inner ring straight track (211) is arranged to face the outer ring inner curved track (113).

[0104] As shown in Fig. 6, the trajectory of the PCD (constant velocity plane circle) of the inner ring track and the trajectory of the PCD (constant velocity plane circle) of the outer ring track are shown.

[0105] Figures 6 and 7 illustrate the trajectory of the PCD (constant velocity plane circle) of the inner ring track, the trajectory of the PCD (constant velocity plane circle) of the outer ring track, and the center point (C212) of the inner ring outer curved track, the center point (C213) of the inner ring inner curved track, the center point (C113) of the outer ring inner curved track, and the center point (C112) of the outer ring outer curved track.

[0106] As described above, the inner ring outer curved track (212), the inner ring inner curved track (213), the outer ring outer curved track (112), and the outer ring inner curved track (113) are all formed in a curved shape (or have a curved cross section).

[0107] Here, the center point of each track means the center of rotation of the material that serves as the base material for the outer and inner rings when machining a curved track with a milling machine.

[0108] In other words, the center point can also be seen as the center of rotation of the material for processing the curved surface of the track.

[0109] FIG. 8 is a drawing defining an outer curved track (112, 212) commonly applied to an inner ring track (210) and an outer ring track (110), an inner curved track (112, 212), and a straight track (111, 211) arranged therebetween, and the position of the center point (C113, C213) of the inner curved track and the position of the center point (C112, C212) of the outer curved track.

[0110] The inner ring track (210) and the outer ring track (110) both include an outer curved track (112, 212), an inner curved track (113, 213), and a straight track (111, 211) arranged therebetween.

[0111] The center points of the inner curved track (C113, C213) and the center points of the outer curved tracks (C112, C212) are spaced apart from each other.

[0112] An offset eccentric shaft (OS) is formed at a predetermined interval in the vertical axis direction, i.e., the y-axis direction, on the outer ring center axis (C2) where the constant velocity joint center is placed, and the center points (C113, C213) of the inner curved track and the center points (C112, C212) of the outer curved track are each placed on the offset eccentric shaft (OS).

[0113] In addition, the x-axis coordinate of the center point (C113, C213) of the inner curve track is the same as the x-axis coordinate of the point (X1) where the inner curve track and the straight track meet, and the x-axis coordinate of the center point (C112, C212) of the outer curve track is the same as the x-axis coordinate of the point (X2) where the outer curve track and the straight track meet.

[0114] And, the center points (C113, C213) of the inner curved track and the center points (C112, C212) of the outer curved track are symmetrical in the x-axis direction while maintaining the same distance with respect to an imaginary vertical line (VL1) passing vertically through the center of the straight track (111, 211).

[0115] The center points (C113, C213) of the inner curved track and the center points (C112, C212) of the outer curved track are spaced apart from each other by a distance of half a1 (a1 / 2) with respect to the virtual vertical line VL1, and are symmetrical in the x-axis direction with respect to the virtual vertical line VL1.

[0116] As illustrated in FIGS. 6 and 7, the center point (C112) of the outer ring outer curved track, the center point (C113) of the outer ring inner curved track, the center point (C212) of the inner ring outer curved track, and the center point (C213) of the inner ring inner curved track are arranged on an offset eccentric shaft (OS) that is vertically spaced a first distance (a1) from the center axis (C2) of the outer ring.

[0117] And, the X-axis section between the center point (C112) of the outer ring outer curved track and the center point (C113) of the outer ring inner curved track corresponds to the arrangement section of the outer ring straight track (111), and the X-axis section between the center point (C212) of the inner ring outer curved track and the center point (C213) of the inner ring inner curved track corresponds to the arrangement section of the inner ring straight track (211).

[0118] Meanwhile, the joint center point (C) is located on the outer ring center axis (C2), and as described above, the joint center point (C) is defined as the center point of an imaginary constant velocity plane formed by the center points of the balls.

[0119] The center point (C113) of the inner curve track of the outer ring is horizontally offset outward by a first horizontal distance (a1) with respect to the center point (C) of the joint.

[0120] Additionally, the center point (C113) of the inner curved track of the outer ring is vertically offset by a first distance (a1) in the opposite direction of the corresponding outer ring track (110).

[0121] The center point (C112) of the outer ring outer curve track is spaced apart from the center point (C113) of the outer ring inner curve track by a horizontal offset of a first distance (a1) in the horizontal direction on the offset eccentric axis (OS).

[0122] In addition, with the joint center point (C) located on the outer ring center axis (C2), the center point (C212) of the inner ring outer curve track forms a horizontal offset inward by a first horizontal distance (a1) with respect to the joint center point (C).

[0123] And, the center point (C212) of the inner ring outer curve track is vertically offset by a first distance (a1) in the vertical direction opposite to the inner ring track with respect to the joint center point (C).

[0124] And, the center point (C213) of the inner ring inner curve track is horizontally offset inward by a first distance (a1) in the horizontal direction on the offset eccentric axis (OS) with respect to the center point (C212) of the inner ring outer curve track.

[0125] Therefore, in summary, with respect to the joint center vertical line (C1) passing vertically through the joint center point (C), the center point (C113) of the inner curved track of the outer ring is spaced outward by a first distance (a1) on the offset eccentric axis (OS).

[0126] The center point (C212) of the inner ring outer curve track is spaced apart from the offset eccentric axis (OS) line by a first distance (a1) in the direction inward of the joint.

[0127] The center point (C113) of the inner curved track of the outer ring and the center point (C212) of the outer curved track of the inner ring are horizontally symmetrical and are spaced apart by a first distance (a1) with the constant velocity joint center vertical line (C1) between them.

[0128] In addition, with respect to the joint center vertical line (C1) passing vertically through the joint center point (C), the center point (C112) of the outer ring outer curve track is spaced apart from the outside of the joint by twice the first distance (a1) on the offset eccentric axis (OS) line.

[0129] The center point (C213) of the inner ring inner curve track is spaced apart from the offset eccentric axis (OS) line by twice the first distance (a1) in the inward direction of the joint.

[0130] Therefore, the center point (C112) of the outer ring outer curve track and the center point (C213) of the inner ring inner curve track form a horizontally symmetrical state spaced apart by twice the first distance (a1) with the constant velocity joint center vertical line (C1) between them.

[0131] That is, the center point (C113) of the inner curved track of the outer ring is located a first distance (a1) outside the joint along the offset eccentric axis (OS) based on the joint center vertical line (C1), and the center point (C112) of the outer ring outer curved track is located a first distance (a1) further outside the joint from the center point (C113) of the inner curved track of the outer ring.

[0132] In addition, the center point (C212) of the inner ring outer curved track is located at a distance (a1) from the center vertical line (C1) of the joint along the offset eccentric axis (OS) inward of the constant velocity joint, and the center point (C213) of the inner ring inner curved track is located at a distance (a1) from the center point (C212) of the inner ring outer curved track further inward of the constant velocity joint.

[0133] And, the outer ring center axis (C2) and the offset eccentric axis (OS) are spaced apart by a first distance (a1).

[0134] Accordingly, the center point (C112) of the outer ring outer curved track, the center point (C113) of the outer ring inner curved track, the center point (C212) of the inner ring outer curved track, and the center point (C213) of the inner ring inner curved track are all maintained in a state of being offset in the y-axis by a first distance in the opposite direction of the corresponding inner ring track and outer ring track relative to the outer ring center axis (C2).

[0135] As illustrated in FIG. 9, when a ball (300) is placed on a track (110, 210), the depth of the track surrounding the ball (300) is defined as the depth from the lowest point of the bottom of the track (110, 200) to the uppermost point of the track (110, 210) that contacts the ball. And the track angle is defined as the angle from the lowest point of the bottom of the track (110, 210) to the uppermost point of the track (110, 210) that contacts the ball.

[0136] Here, as the depth of the track surrounding the ball (300) increases, the ability to support the ball increases, and accordingly, the degree of deformation of the inner ring track or outer ring track also decreases.

[0137] Fig. 10 illustrates a state in which the joint according to the present invention is cut at +47 degrees, and Fig. 11 illustrates a state in which it is cut at -47 degrees. When cutting in the IN (+) direction, the inner track of the outer ring is greatly affected by the pressure from the ball, and when cutting in the OUT (-) direction, the inner track of the inner ring is greatly affected by the pressure from the ball.

[0138] Therefore, when cutting in the IN(+) direction, it is important to evaluate the performance of the relationship between the inner track of the outer ring and the ball, and when cutting in the OUT(-) direction, it is important to evaluate the performance of the relationship between the inner track of the inner ring and the ball.

[0139] As illustrated in FIG. 15, the configuration of a constant velocity joint (hereinafter referred to as a “constant velocity joint”) having a skew angle according to a second embodiment of the present invention includes an outer ring (1100) having a cup portion (1101) and connected to a shaft (1102) that transmits rotational force to a wheel of a vehicle, an inner ring (1200) provided inside the outer ring, a plurality of balls (1300) provided between the outer ring and the inner ring (1200), and a cage (1400) that supports the balls (1300) and helps the balls (1300) maintain a constant velocity plane.

[0140] In Fig. 15, six balls (1300) are shown, but the quantity is not limited to this.

[0141] On the inner surface of the cup (1101), a number of outer ring tracks (1110) corresponding to the number of balls are provided.

[0142] In addition, an inner ring track (1210) corresponding to the number of balls and facing each outer ring track (1110) is provided on the outer surface of the inner ring (1200).

[0143] The cage (1400) is provided with a window (1401) into which each ball (1300) is inserted, and when the joint is cut, the constant velocity plane of the ball (1300) can be maintained by the cage (1400).

[0144] Figures 16 and 17 illustrate the internal structure of the outer ring (1100).

[0145] On the inner surface of the outer ring (1100), the outer ring tracks (1110) are all open so as to face outward from the cup portion (1101). The outer ring tracks (1110) are provided to have a certain amount of skew angle with respect to the horizontal center line of the joint, and the outer ring tracks (1110) adjacent to each other have skew angles in different directions.

[0146] Here, the outer ring track appears in two forms, so for convenience, it is divided into the first outer ring track (1110a) and the second outer ring track (1110b).

[0147] The outer ring track (1110; 1110a, 1110b) includes an outer ring straight track (1111; 1111a, 1111b) whose side cross-section is in a straight shape, an outer ring outer curved track (1112: 1112a, 1112b) formed on the outside of the outer ring straight track (1111; 1111a, 1111b) and formed in a curved shape that is slightly inclined downward toward the outside, and an outer ring inner curved track (1113; 1113a, 1113b) formed on the inside of the outer ring straight track (1111; 1111a, 1111b) and formed in a curved shape that is inclined downward toward the inside of the cup portion (1101).

[0148] It is preferable that the length of the outer ring inner curved track (1113; 1113a, 1113b) be longer than that of the outer ring outer curved track (1112; 1112a, 1112b).

[0149] It is preferable that the outer ring straight track (1111; 1111a, 1111b) be configured as a horizontal straight track arranged in a horizontal direction when the constant velocity joint is not cut.

[0150] Meanwhile, an outer ring straight track inner boundary line (1114; 1114a, 1114b) is provided between the outer ring straight track (1111:1111a, 1111b) and the outer ring inner curved track (1113; 1113a, 1113b).

[0151] And, an outer ring straight track outer boundary line (1115; 1115a, 1115b) is provided between the outer ring straight track (1111:1111a, 1111b) and the outer ring outer curved track (1112; 1112a, 1112b).

[0152] Thus, the outer ring straight track (1111:1111a, 1111b) can be provided between the outer ring straight track inner boundary line (1114;1114a, 1114b) and the outer ring straight track outer boundary line (1115;1115a, 1115b).

[0153] As will be explained in detail later, the skew angle of the outer ring track (see Fig. 21a, osa)) is formed based on the inner boundary line (1114; 1114a, 1114b) of the outer ring straight track, and the skew angle of the inner ring track (see Fig. 21b, isa)) is formed based on the outer boundary line (1215; 1215a, 1215b) of the inner ring straight track.

[0154]

[0155] Figures 18 and 19 illustrate the outer surface structure of the inner ring (1200), and Figure 20 illustrates a side cross-section of the inner ring (1200).

[0156] On the outer surface of the inner ring (1200), the inner ring track (1210) is entirely open so as to face outward from the cup portion (1101). The inner ring track (1210) is provided to have a certain amount of skew angle with respect to the rotation center line (C2) of the constant velocity joint, and adjacent inner ring tracks (1210) have skew angles in different directions.

[0157] The inner ring track (1210) includes an inner ring straight track (1211) whose side cross-section is formed in a straight shape, an inner ring outer curved track (1212) formed on the outside of the inner ring straight track (1211) and formed in a curved shape that slopes downward outward, and an inner ring inner curved track (1213) formed on the inside of the inner ring straight track (1211) and formed in a curved shape that slopes slightly downward inward toward the inside of the cup portion (1101).

[0158] It is preferable that the length of the inner ring outer curve track (1212) be formed longer than that of the inner ring inner curve track (1213).

[0159] Here, the inner ring track (1210) appears in two forms, so for convenience, it is divided into the first inner ring track (1210a) and the second inner ring track (1210b).

[0160] The inner ring track (1210; 1210a, 1210b) includes an inner ring straight track (1211; 1211a, 1211b) whose side cross-section is in a straight shape, an inner ring outer curved track (1212: 1212a, 1212b) formed on the outside of the inner ring straight track (1211; 1211a, 1211b) and formed in a curved shape that is slightly inclined downward toward the outside, and an inner ring inner curved track (1213; 1213a, 1213b) formed on the inside of the inner ring straight track (1211; 1211a, 1211b).

[0161] It is preferable that the length of the inner ring outer curved track (1212; 1212a, 1212b) be longer than that of the inner ring inner curved track (1213; 1213a, 1213b).

[0162] It is preferable that the inner ring straight track (1211; 1211a, 1211b) be configured as a horizontal straight track arranged in a horizontal direction when the constant velocity joint is not cut.

[0163] Meanwhile, an inner ring straight track inner boundary line (1214; 1214a, 1214b) is provided between the inner ring straight track (1211: 1211a, 1211b) and the inner ring inner curved track (1213; 1213a, 1213b).

[0164] And, an inner ring straight track outer boundary line (1215; 1215a, 1215b) is provided between the inner ring straight track (1211:1211a, 1211b) and the inner ring outer curved track (1212; 1212a, 1212b).

[0165] Thus, the inner ring straight track (1211:1211a, 1211b) can be provided between the inner ring straight track inner boundary line (1214;1214a, 1214b) and the inner ring straight track outer boundary line (1215;1215a, 1215b).

[0166] As will be explained in detail later, the skew angle of the inner ring track is formed based on the outer boundary line (1215; 1215a, 1215b) of the inner ring straight track, and particularly, the center point of the outer boundary line (1215; 1215a, 1215b) of the inner ring straight track.

[0167] A shaft insertion hole (1220) is provided at the center of the inner ring (1200), and a circlip groove (1230, see Fig. 20) is provided on the inner surface of the shaft insertion hole (1220), into which a circlip for fixing the shaft (1500) and the inner ring (1200) is fitted.

[0168] It is preferable that the inner ring straight track (1211; 1211a, 1211b) be configured as a horizontal straight track arranged in a horizontal direction when the constant velocity joint is not cut.

[0169] Figure 21a illustrates a state in which the outer ring track (1110) is arranged along the outer ring track skew angle (os), and Figure 21b illustrates a state in which the inner ring track (210) is arranged along the inner ring track skew angle (is).

[0170] As illustrated in FIGS. 20 and 21a, 21b and 22, the inner ring track (1210) includes a first inner ring track (1210a) and a second inner ring track (1210b). The outer ring track (1110) includes a first outer ring track (1110a) and a second outer ring track (1110b). The first outer ring track (1110a) corresponds to the first inner ring track (1210a) and faces the balls (1200) and the cage (1400) in the center. The second outer ring track (1110b) corresponds to the second inner ring track (1210b) and faces the balls (1200) and the cage (1400) in the center.

[0171] The first inner ring track (1210a) is arranged diagonally in a first direction with respect to the central axis (C2) of the joint to form an inner ring track skew angle (isa). The first outer ring track (1110a) facing the first inner ring track (1210a) is arranged diagonally in a second direction symmetrical to the first direction with respect to the central axis (C2) to form an outer ring track skew angle (osa).

[0172] The second inner ring track (1210b) arranged next to the first inner ring track (1210a) is arranged diagonally in the second direction with respect to the central axis (C2) of the joint to form an inner ring track skew angle (isa). The second outer ring track (1110b) facing the second inner ring track (1210b) is arranged diagonally in the first direction, which is symmetrical with respect to the central axis (C2) in the second direction, to form an outer ring track skew angle (osa).

[0173] And, the width direction of the inner ring straight track (1211; 1211a, 1211b) is formed in a direction orthogonal to an imaginary extension line (SL2) formed along the inner ring track skew angle (isa).

[0174] That is, the inner ring straight track inner boundary line (1214; 1214a, 1214b) and the inner ring straight track outer boundary line (1215; 1215a, 1215b) are formed in a direction orthogonal to the imaginary extension line (SL2).

[0175] Meanwhile, the width direction of the outer ring straight track (1111; 1111a, 1111b) is formed in a direction orthogonal to an imaginary extension line (SL1) formed along the outer ring track skew angle (osa).

[0176] That is, the outer ring straight track inner boundary line (1114; 1114a, 1114b) and the outer ring straight track outer boundary line (1115; 1115a, 1115b) are formed in a direction orthogonal to the imaginary extension line (SL1).

[0177] In Figures 21a and 21b, the first outer ring track, the second outer ring track, the first inner ring track, and the second inner ring track are not separately distinguished, but the outer ring track, the inner ring track, and their sub-components are simply described using component words without ordinal numbers.

[0178] As illustrated in Fig. 21a, an outer ring track skew angle (osa) is formed diagonally at a predetermined angle with respect to the rotational center axis (C2) of the constant velocity joint. The point or starting point at which the outer ring skew angle (osa) is formed with respect to the rotational center axis (C2) of the constant velocity joint is the center point of the outer ring straight track inner boundary line (114).

[0179] In particular, the center point of the outer ring straight track outer boundary line (1115) becomes the starting point (P1), which is located at the center of the outer ring track.

[0180] In Fig. 21a, the rotation center axis (C2) of the constant velocity joint intersects the center of the inner boundary line (1114) of the outer ring straight track with an imaginary extension line (SL1) formed along the outer ring track skew angle (osa). Here, the intersection point or starting point (P1) is indicated by a small dot.

[0181] And, the width direction of the outer ring straight track (111) is formed in a direction perpendicular to an imaginary extension line (SL1) formed along the outer ring track skew angle (osa).

[0182] That is, the outer ring straight track inner boundary line (1114) and the outer ring straight track outer boundary line (1115) are formed in a direction perpendicular to the virtual extension line (SL1).

[0183] As illustrated in Fig. 21b, an inner ring track skew angle (is) is formed diagonally at a predetermined angle with respect to the rotational center axis (C2) of the constant velocity joint. The point or starting point (P2) at which the inner ring track skew angle (isa) is formed is the outer boundary line (1215) of the inner ring straight track, and in particular, the center point of the outer boundary line (1215) of the inner ring straight track is the starting point (P2), which is located at the center of the inner ring track.

[0184] At the center of the inner ring straight track outer boundary line (1215), the rotation center axis (C2) of the constant velocity joint and the virtual extension line (SL2) formed along the inner ring track skew angle (isa) intersect.

[0185] Here, the intersection or starting point (P2) is indicated by a small dot.

[0186] As described above, the angular amounts of the outer ring track skew angle (osa) and the inner ring track skew angle (isa) of the outer ring track (1110) and inner ring track (1210) facing each other must be the same, and their directions must be arranged in opposite directions.

[0187] That is, the outer ring track (1110) and the inner ring track (1210) must be arranged to intersect each other along a diagonal direction that is symmetrical with respect to the rotation center axis (C2) of the constant velocity joint.

[0188] And, the outer ring straight track (1111) is formed in a direction perpendicular to an imaginary extension line (SL1) formed along the outer ring track skew angle (osa).

[0189] At this time, it is preferable that the position of the intersection or starting point of the virtual extension line (SL1) formed along the rotation center axis (C2) of the point indicated as P1 and the outer ring track skew angle be located outside (outside of the outer ring cup) of the position of the intersection or starting point of the virtual extension line (SL2) formed along the rotation center axis (C2) of the point indicated as P2 and the inner ring track skew angle (isa).

[0190] As illustrated in FIGS. 22 and 23, in a non-cut state, the outer ring straight track (1111; 1111a, 1111b) is positioned outside the cup portion (101) relative to the vertical center (C1) of the constant velocity joint, that is, the vertical line of the rotation center of the virtual constant velocity plane implemented by the center points of the balls, and the inner ring straight track (1211; 1211a, 1211b) is positioned inside the cup portion (1101) relative to the vertical center (C1) of the joint.

[0191] And, in a state where the angle is not formed, the virtual line formed by the vertical center (C1) of the constant velocity joint is placed on the outer ring inner curved track (1113; 1113a, 1113b) and the inner ring outer curved track (1212; 1212a, 1212b).

[0192] And, in a state where the constant velocity joint is not cut, the outer ring straight track (1111; 1111a, 1111b) is arranged to face the inner ring outer curved track (1212; 1212a, 1212b), and the inner ring straight track (1211; 1211a, 1211b) is arranged to face the outer ring inner curved track (1113; 1113a, 1113b).

[0193] As shown in Fig. 24, when the outer ring track (1110; 1110a, 1110b) and the inner ring track (1210; 1210a, 1210b) facing each other are arranged in opposite directions (cross) as described above, when viewed from the front, a part of the ball (1300) appears to be covered.

[0194] The direction in which each outer ring track (1110; 1110a, 1110b) faces (outer ring track skew angle direction) and the direction in which each inner ring track (1210; 1210a, 1210b) faces (inner ring track skew angle direction) are formed to be staggered from each other.

[0195] As a comparative example, as shown in FIGS. 25a to 25c, in the case where there is no skew angle, the inner ring track (21) and the outer ring track (11) are arranged in a parallel line and overlap each other in the shape of a letter I, and even when viewed from the front, the space formed by the inner ring track (21) and the outer ring track (11) forms an almost circular shape.

[0196] In Fig. 25b, the square box (B1) above is a simple representation in the form of a plan view of a state in which the inner ring track (21) and the outer ring track (11) are arranged in the same direction on the plan view.

[0197] However, in the case of the present invention, which has an inner ring track (1210) arranged diagonally according to the inner ring track skew angle as shown in FIGS. 26a to 26c, and an outer ring track (1110) arranged diagonally according to the outer ring track skew angle and intersecting with the inner ring track (1210), a virtual line extending the skew angle of the inner ring track and a virtual line extending the skew angle of the outer ring track intersect.

[0198] In Fig. 26b, the square box (B2) above illustrates a state where the inner ring skew angle and the outer ring skew angle intersect on a plan view. In addition, the inner ring straight track (1211) according to the inner ring skew angle and the outer ring straight track (1111) according to the outer ring skew angle do not overlap each other in the vertical direction, and the outer ring straight track (1111) is positioned outside the inner ring straight track (1211).

[0199] And, in the uncut state, a ball (1300) is placed between the outer ring straight track (1111) and the inner ring straight track (1211).

[0200] As shown in Fig. 26c, since the inner ring track (1210) and the outer ring track (1110) cross, the front view of the space formed by the inner ring track (1210) and the outer ring track (1110) is not a circular space like Fig. 25c, but takes the form of a space that is biased in one direction.

[0201] As shown in Fig. 27, the trajectory of the PCD (constant velocity plane circle) of the inner ring track and the trajectory of the PCD (constant velocity plane circle) of the outer ring track are shown.

[0202] Figures 27 and 28 illustrate the trajectory of the PCD (constant velocity plane circle) of the inner ring track, the trajectory of the PCD (constant velocity plane circle) of the outer ring track, the position of the center point (C1212) of the inner ring outer curved track, the position of the center point (C1213) of the inner ring inner curved track, the position of the center point (C1113) of the outer ring inner curved track, and the position of the center point (C1112) of the outer ring outer curved track.

[0203] The center point (C1212) of the inner ring outer curved track is also the starting point of the inner ring skew angle and is also the outer boundary line (1215) of the inner ring straight track.

[0204] Additionally, the center point (C1213) of the inner ring inner curved track is also the inner boundary line (1214) of the inner ring straight track.

[0205] Accordingly, an inner ring straight track (1211) is formed in a corresponding section (a corresponding section in the vertical direction) between the inner ring straight track inner boundary line (1214) and the inner ring straight track outer boundary line (1215), and the section where the inner ring straight track (211) is formed is the same as the section between the center point (C1212) of the inner ring outer curved track and the center point (C1213) of the inner ring inner curved track.

[0206] Meanwhile, the center point (C1113) of the inner curved track of the outer ring is also the starting point of the inner ring skew angle and also the outer ring straight track boundary line (1114).

[0207] In addition, the center point (C1112) of the outer ring outer curved track is also the outer ring straight track outer boundary line (1115). Therefore, an outer ring straight track (1111) is formed in a corresponding section (a corresponding section in the vertical direction) between the outer ring straight track inner boundary line (114) and the outer ring straight track outer boundary line (1115), and the section where the outer ring straight track (1111) is formed is the same as the section between the center point (C1112) of the outer ring outer curved track and the center point (C1113) of the outer ring inner curved track.

[0208] As described above, the inner ring outer curved track (1212), the inner ring inner curved track (1213), the outer ring outer curved track (1112), and the outer ring inner curved track (1113) are all formed in a curved shape (or have a curved cross section).

[0209] Here, the center point of each track means the center of rotation of the material that serves as the base material for the outer and inner rings when machining a curved track with a milling machine.

[0210] In other words, the center point can also be seen as the center of rotation of the material for processing the curved surface of the track.

[0211] That is, FIG. 29 is a drawing defining an outer curved track (1112, 1212) commonly applied to an inner ring track (1210) and an outer ring track (1110), an inner curved track (1113, 1213), and a straight track (1111, 1211) disposed therebetween, and the position of the center point (C1113, C1213) of the inner curved track and the position of the center point (C1112, C1212) of the outer curved track.

[0212] Both the inner ring track (1210) and the outer ring track (1110) are provided with an outer curved track (1112, 1212), an inner curved track (1113, 1213), and a straight track (1111, 1211) arranged between them.

[0213] The center points of the inner curved track (C1113, C1213) and the center points of the outer curved tracks (C1112, C1212) are spaced apart from each other.

[0214] An offset eccentric axis (OS) is formed at a predetermined interval in the vertical axis direction, i.e., the y-axis direction, on the outer ring center axis (C2) on which the joint center is placed, and the center points (C1113, C1213) of the inner curved track and the center points (C1112, C1212) of the outer curved track are each placed on the offset eccentric axis (OS).

[0215] And, the x-axis coordinate of the center point (C1113, C1213) of the inner curve track is the same as the x-axis coordinate of the point (X1) where the inner curve track and the straight track meet, and the x-axis coordinate of the center point of the outer curve track is the same as the x-axis coordinate of the point (X2) where the outer curve track and the straight track meet.

[0216] And, the center points (C1113, C1213) of the inner curved track and the center points (C1112, C1212) of the outer curved track are symmetrical in the x-axis direction while maintaining the same distance with respect to an imaginary vertical line (VL1) passing vertically through the center of the straight track (1111, 1211).

[0217] The center points (C1113, C1213) of the inner curved track and the center points (C1112, C1212) of the outer curved track are spaced apart from each other by a distance of half a1 (a1 / 2) with respect to the virtual vertical line VL1, and are symmetrical in the x-axis direction with respect to the virtual vertical line VL1.

[0218] As illustrated in FIGS. 27 and 28, the center point (C1112) of the outer ring outer curved track, the center point (C1113) of the outer ring inner curved track, the center point (C1212) of the inner ring outer curved track, and the center point (C1213) of the inner ring inner curved track are arranged on an offset eccentric shaft (OS) that is a first distance vertically away from the center axis (C2) of the outer ring.

[0219] And, the X-axis section between the center point (C1112) of the outer ring outer curved track and the center point (C1113) of the outer ring inner curved track is the same as the X-axis section of the outer ring straight track (1111), and the X-axis section between the center point (C1212) of the inner ring outer curved track and the center point (C1213) of the inner ring inner curved track is the same as the X-axis section of the inner ring straight track (1211).

[0220] Meanwhile, the joint center point (C) is positioned on the outer ring center axis (C2), and as described above, the joint center point (C) is defined as the center point of an imaginary constant velocity plane formed by the center points of the balls, and the center point (C1113) of the inner curved track of the outer ring has a horizontal offset of a first distance (a1) in the horizontal direction outward with respect to the joint center point (C) and a vertical offset of a first distance (a1) in the vertical direction in the opposite direction of the corresponding outer ring track (1110).

[0221] And, the center point (C1112) of the outer ring outer curve track has a horizontal offset of a first distance (a1) in the horizontal direction outward on the offset eccentric axis (OS) with respect to the center point (C1113) of the outer ring inner curve track.

[0222] In addition, with the joint center point (C) positioned on the outer ring center axis (C2), the center point (C1112) of the outer ring outer curved track has a horizontal offset of a first distance (a1) inward in the horizontal direction with respect to the joint center point (C) and a vertical offset of a first distance (a1) in the vertical direction in the opposite direction of the inner ring track.

[0223] And, the center point (C1213) of the inner ring inner curve track has a horizontal offset inward by a first distance (a1) in the horizontal direction on the offset eccentric axis line with respect to the center point (C1212) of the inner ring outer curve track.

[0224] Therefore, in summary, with respect to the joint center vertical line (C1) passing vertically through the joint center point (C), the center point (C1113) of the outer ring inner curved track is spaced apart from the joint outside by a first distance (a1) on the offset eccentric axis (OS) line, and the center point (C1212) of the inner ring outer curved track is spaced apart from the joint inside by a first distance (a1) on the offset eccentric axis (OS) line, thereby forming a horizontal symmetrical state spaced apart from the joint center vertical line (C1) by the first distance (a1).

[0225] In addition, with respect to the joint center vertical line (C1) passing vertically through the joint center point (C), the center point (C1112) of the outer ring outer curve track is spaced apart from the outside of the joint by twice the first distance (a1) on the offset eccentric axis (OS) line.

[0226] The center point (C1213) of the inner ring inner curve track is spaced apart from the offset eccentric axis (OS) line by twice the first distance (a1) in the inward direction of the joint, thereby forming a horizontally symmetrical state spaced apart by twice the first distance (a1) with the joint center vertical line (C1) in between.

[0227] That is, the center point (C1113) of the inner curved track of the outer ring is located a first distance (a1) outside the joint along the offset eccentric axis (OS) based on the joint center vertical line (C1), and the center point (C1112) of the outer ring outer curved track is located a first distance (a1) further outside the joint from the center point (C1113) of the inner curved track of the outer ring.

[0228] In addition, the center point (C1212) of the inner ring outer curved track is located at a distance (a1) inward from the joint center vertical line (C1) along the offset eccentric axis (OS), and the center point (C1213) of the inner ring inner curved track is located at a distance (a1) further inward from the center point (C1212) of the inner ring outer curved track.

[0229] And, the outer ring center axis (C2) and the offset eccentric axis (OS) are spaced apart by a first distance (a1).

[0230] Accordingly, the center point (C1112) of the outer ring outer curved track, the center point (C113) of the outer ring inner curved track, the center point (C1212) of the inner ring outer curved track, and the center point (C1213) of the inner ring inner curved track are all maintained in a state of being offset in the y-axis by a first distance in the opposite direction of the corresponding inner ring track and outer ring track relative to the outer ring center axis (C2).

[0231] While maintaining the above-described offsets, the outer ring track (1110) is arranged diagonally along the outer ring skew angle line starting from the outer ring skew angle starting point (i.e., the outer ring inner curved track center point (C1113) and a point on the outer ring straight track inner boundary line (1114)).

[0232] Additionally, the inner ring track (1210) is arranged diagonally along the outer ring skew line starting from the inner ring skew angle starting point (i.e., the point on the inner ring straight track outer boundary line (1215) that is the inner ring outer curved track center point (C1212)).

[0233] Since the length of the diagonal line (skew angle line) is longer than that of the straight line, the ball movement distance according to the combination of intersecting diagonal tracks with a skew angle as in the present invention is greater than the ball movement distance according to the combination of inner / outer track in the shape of the letter I as in Fig. 25, so the amount of cutting can be greater than in the case of Fig. 25.

[0234] Fig. 30 illustrates a state in which the joint according to the present invention is cut at +52 degrees, and Fig. 31 illustrates a state in which it is cut at -52 degrees. When cutting in the IN (+) direction, the inner track of the outer ring is greatly affected by the pressure from the ball, and when cutting in the OUT (-) direction, the inner track of the inner ring is greatly affected by the pressure from the ball.

[0235] Therefore, when cutting in the IN(+) direction, it is important to evaluate the performance of the relationship between the inner track of the outer ring and the ball, and when cutting in the OUT(-) direction, it is important to evaluate the performance of the relationship between the inner track of the inner ring and the ball.

[0236] Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is only for the purpose of explaining the invention, and a person having ordinary skill in the art to which the present invention pertains will be able to understand that various modifications or equivalent embodiments are possible from the detailed description of the invention.

[0237] Therefore, the true scope of the present invention should be determined by the technical idea of ​​the patent claims.

Claims

1. An outer ring having an outer ring track formed on the inner surface; An inner ring having an inner ring track formed on the outer surface; A ball disposed between the outer ring and the inner ring; Including a cage that is placed between the outer ring and the inner ring and supports the ball, The above outer ring track includes an outer ring straight track, an outer ring outer curved track formed on the outside of the outer ring straight track, and an outer ring inner curved track formed on the inside of the outer ring straight track. The inner ring track includes an inner ring straight track, an inner ring outer curved track formed on the outside of the inner ring straight track, and an inner ring inner curved track formed on the inside of the inner ring straight track. The center point of the outer ring outer curve track, the center point of the outer ring inner curve track, A symmetrical double offset constant velocity joint, characterized in that the center point of the inner ring outer curved track and the center point of the inner ring inner curved track are arranged on an offset eccentric axis line that is a first distance vertically apart from the center axis of the outer ring.

2. In paragraph 1, In the case where the constant velocity joint is not cut, The outer ring straight track is arranged to face the inner ring outer curved track, A symmetrical double offset constant velocity joint characterized in that the inner ring straight track is arranged to face the outer ring inner curved track.

3. In paragraph 1, The joint center point is located on the outer ring center axis, The joint center point is defined as the center point of an imaginary constant velocity plane formed by the center points of the balls. A symmetrical double offset constant velocity joint, characterized in that the center point of the outer ring inner curved track has a horizontal offset of a first distance outward in the horizontal direction with respect to the joint center point and a vertical offset of a first distance in the vertical direction in the opposite direction of the outer ring track.

4. In paragraph 3, The center point of the outer curved track of the outer ring is; A symmetrical double offset constant velocity joint characterized in that it has a horizontal offset of a first distance in the horizontal direction outward on the offset eccentric axis line with respect to the center point of the inner curved track of the outer ring.

5. In paragraph 1, The joint center point is located on the outer ring center axis, A symmetrical double offset constant velocity joint, characterized in that the center point of the inner ring outer curved track has a horizontal offset of a first distance inward in the horizontal direction with respect to the joint center point and a vertical offset of a first distance in the vertical direction in the opposite direction of the inner ring track.

6. In paragraph 5, The center point of the inner curved track of the inner ring is; A symmetrical double offset constant velocity joint characterized in that it has a horizontal offset of a first distance inward in the offset eccentric axis line with respect to the center point of the outer curved track of the inner ring.

7. In paragraph 1, The layout section of the inner ring straight track corresponds to the section between the center point of the inner ring outer curved track and the center point of the inner ring inner curved track, and its length is equal to the first distance. A symmetrical double offset constant velocity joint, characterized in that the arrangement section of the outer ring straight track corresponds to the section between the center point of the outer ring outer curved track and the center point of the outer ring inner curved track, and the length thereof is equal to the first distance.

8. An outer ring having an outer ring track formed on the inner surface; An inner ring having an inner ring track formed on the outer surface; A ball disposed between the outer ring and the inner ring; Including a cage that is placed between the outer ring and the inner ring and supports the ball, The above outer ring track includes an outer ring straight track, an outer ring outer curved track formed on the outside of the outer ring straight track, and an outer ring inner curved track formed on the inside of the outer ring straight track. The inner ring track includes an inner ring straight track, an inner ring outer curved track formed on the outside of the inner ring straight track, and an inner ring inner curved track formed on the inside of the inner ring straight track. The outer ring track and inner ring track facing each other are arranged diagonally with a constant skew angle with respect to the rotational center axis of the joint to maintain an intersecting state. The center point of the outer ring outer curve track, the center point of the outer ring inner curve track, A symmetrical double offset constant velocity joint, characterized in that the center point of the inner ring outer curved track and the center point of the inner ring inner curved track are arranged on an offset eccentric axis line that is a first distance vertically apart from the center axis of the outer ring.

9. In paragraph 8, The outer ring track includes a first outer ring track and a second outer ring track arranged next to it. The inner ring track includes a first inner ring track and a second inner ring track arranged next to it. The first inner ring track is arranged diagonally in a first direction with respect to the rotation center axis of the joint to form an inner ring track skew angle, and the first outer ring track facing it is arranged diagonally in a second direction symmetrical to the first direction with respect to the rotation center axis to form an outer ring track skew angle. The second inner ring track arranged next to the first inner ring track is arranged diagonally in the second direction with respect to the rotational center axis of the joint to form an inner ring track skew angle. A symmetrical double offset constant velocity joint characterized in that the second outer ring track facing the rotation center axis is arranged diagonally in the first direction symmetrical to the second direction to form an outer ring track skew angle.

10. In paragraph 8, The inner ring straight track is formed in a direction perpendicular to an imaginary extension line formed along the inner ring track skew angle, A symmetrical double offset constant velocity joint characterized in that the outer ring straight track is formed in a direction perpendicular to an imaginary extension line formed along the outer ring track skew angle.

11. In paragraph 8, The inner ring straight track is; The inner ring outer curved track and the inner ring straight track outer boundary line that forms the boundary, It is placed between the inner curved track of the inner ring and the inner boundary line of the inner straight track which is the boundary, A symmetrical double offset constant velocity joint characterized in that the inner ring track skew angle is formed based on the outer boundary line of the inner ring straight track.

12. In paragraph 8, The outer ring straight track is The outer ring outer curved track and the outer ring straight track outer boundary line that forms the boundary, It is placed between the inner curved track of the outer ring and the inner boundary line of the straight track of the inner ring, which is the boundary. A symmetrical double offset constant velocity joint characterized in that the outer ring track skew angle is formed based on the inner boundary line of the outer ring straight track.

13. In paragraph 8, In a state where the joint is not cut, The outer ring straight track is arranged to face the inner ring outer curved track, A symmetrical double offset constant velocity joint characterized in that the inner ring straight track is arranged to face the outer ring inner curved track.

14. In paragraph 8, The center point of the inner ring inner curve track is the starting point of the inner ring track skew angle, A symmetrical double offset constant velocity joint, characterized in that the center point of the outer ring inner curved track is the starting point of the outer ring track skew angle.

15. In paragraph 8, A symmetrical double offset constant velocity joint, characterized in that the X-axis section between the center point of the outer ring outer curved track and the center point of the outer ring inner curved track is the same as the X-axis section of the outer ring straight track.

16. In paragraph 8, A symmetrical double offset constant velocity joint, characterized in that the X-axis section between the center point of the inner ring outer curved track and the center point of the inner ring inner curved track is the same as the X-axis section of the inner ring straight track.

17. In paragraph 8, The joint center point is located on the outer ring center axis, The joint center point is defined as the center point of an imaginary constant velocity plane formed by the center points of the balls. The center point of the outer ring inner curve track and the starting point of the outer ring track skew angle have a horizontal offset of a first distance in the horizontal direction outward from the joint center point and a vertical offset of a first distance in the vertical direction in the opposite direction of the outer ring track, The center point of the outer curved track of the outer ring is; A symmetrical double offset constant velocity joint characterized in that it has a horizontal offset of a first distance in the horizontal direction outward on the offset eccentric axis line with respect to the center point of the inner curved track of the outer ring.

18. In paragraph 8, The joint center point is located on the outer ring center axis, The center point of the outer ring outer curve track and the starting point of the inner ring track skew angle have a horizontal offset of a first distance inward in the horizontal direction with respect to the joint center point and a vertical offset of a first distance in the vertical direction in the opposite direction of the inner ring track, The center point of the inner curved track of the inner ring is; A symmetrical double offset constant velocity joint characterized in that it has a horizontal offset of a first distance inward in the offset eccentric axis line with respect to the center point of the outer curved track of the inner ring.

19. In paragraph 8, The layout section of the inner ring straight track is equal to the section between the center point of the inner ring outer curved track and the center point of the inner ring inner curved track, and its length is equal to the first distance. A symmetrical double offset constant velocity joint characterized in that the arrangement section of the outer ring straight track is equal to the section between the center point of the outer ring outer curved track and the center point of the outer ring inner curved track, and the length thereof is equal to the first distance.

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