Constant Velocity Joint

Abstract

The constant velocity joint according to the present invention enables constant velocity rotation of the two rotation axes by using a spline shaft and a gear so that the connecting centerline of the two rings connected between the two yokes always lies at the center of the two rotation axes. It has a large maximum angle of cut, maximum torque, and maximum axial force, and is easy to manufacture from small to large sizes.

Description

Technology Field

[0001] A shaft coupling device that transmits rotational force between two rotating shafts with a bend without change in angular velocity. Background Technology

[0002] Universal joints have a simple structure, but a difference in angular velocity can occur between the two rotation axes. Constant velocity joints, such as the Burfield joint and the tripod joint, do not result in a difference in angular velocity.

[0003] The constant velocity joints currently in widespread use have usage problems such as wear of balls or rollers, limitations on angle of cut, limitations on torque, and limitations on axial force, and manufacturing problems such as three-dimensional precision surface machining.

[0004] Although there have been many new attempts to solve the aforementioned various problems, the process of solving them has resulted in an excessive increase in the number of parts, increased structural complexity or size, and intensified limitations on angle of cut, torque, and axial force. Prior art literature

[0005] US 7,144,326 B2 Constant velocity coupling and control system therefor 2006.12. 5. Glenn Alexander Thompson(AU)US 9,371,864 B2 Constant velocity joint 2016.6.21. Martin Gecik (SK)

[0006] doesn't exist The problem to be solved

[0007] The objective of the present invention is to create a constant velocity joint that has no three-dimensional precision machined surface, does not use balls or rollers, has a simple structure, and does not cause limitations on angle, torque, or axial force. means of solving the problem

[0008] A gear mechanism is configured to transmit rotational force between two rotation shafts by connecting two rings installed on each of the two yokes, such that the centerline of the shaft connecting the two rings does not tilt further toward either rotation shaft. Effects of the invention

[0009] The constant velocity joint according to the present invention does not include a three-dimensional precision machined curved surface and has a simple structure, making it easy to manufacture from small to large sizes. It also does not include balls or rollers, so there is less wear and tear, making maintenance easy. Furthermore, since the angle, torque, and axial force are not limited, it can be widely used to replace existing constant velocity joints in various places where constant velocity joints are required. Brief explanation of the drawing

[0010] FIG. 1 shows a first rotation axis (1), a first yoke (2), a first ring (3), a first yoke pin (4), a second yoke pin (5), a first yoke hole (6), a second yoke hole (7), a first ring hole (8), a second ring hole (9), a fifth ring hole (10), and a sixth ring hole (11). Reference numerals 12, 13, 14, and 15 indicate positions on the first yoke (2). FIG. 2 shows a second rotation axis (21), a second yoke (22), a second ring (23), a third yoke pin (24), a fourth yoke pin (25), a third yoke hole (26), a fourth yoke hole (27), a third ring hole (28), a fourth ring hole (29), a seventh ring hole (30), an eighth ring hole (31), a first ring pin (38), and a second ring pin (39). Reference numerals 32, 33, and 35 indicate positions on the second yoke (22). FIG. 3 shows a first pinion (41), a first pinion tooth (42), a first pinion hub (43), a first pinion ring groove (45), a second pinion (46), a second pinion tooth (47), a second pinion hub (48), a second pinion hub helical male spline tooth (49), a second pinion ring groove (50), a third pinion (51), a third pinion tooth (52), a third pinion hub (53), a third pinion hub helical male spline tooth (54), a fourth pinion (56), a fourth pinion tooth (57), a fourth pinion hub (58), a fourth pinion hub helical male spline tooth (59), a first pinion ring (61), a second pinion ring (62), and an auxiliary hub (63). FIG. 4 shows a first spline shaft (71), a first spline shaft helical arm type spline tooth part (72), a second spline shaft (73), a second spline shaft helical arm type spline tooth part (74), an auxiliary shaft (75), a central shaft (78), a first central shaft ring (79), and a second central shaft ring (80). FIG. 5 shows a cross-section of the device shown in FIG. 3 installed inside the first ring pin (38) and the second ring pin (39), and the device shown in FIG. 4 installed inside. Figure 6 shows the cross-section of each part spread out to aid in understanding Figure 5. Figure 7 shows a left-twisted helical male spline hub (81) and a left-twisted helical male spline tooth (82). Figure 8 shows a right-twisted helical male spline hub (83) and a right-twisted helical male spline tooth (84). FIG. 9 shows a left-right torsion helical arm type spline shaft (85), a left torsion helical arm type spline tooth (86), and a right torsion helical arm type spline tooth (87). FIG. 10 shows that a first ring gear (91) and a second ring gear (93) are installed on the first yoke (2). FIG. 11 shows that a third ring gear (101) and a fourth ring gear (103) are installed on the second yoke (22). FIG. 12 shows a cross-section cut by the plane formed by the center line of the center axis (78) and the straight line passing through the center of the first yoke pin (4) and the center of the second yoke pin (5) with respect to the combined device shown in FIG. 1 to 4, FIG. 10, and FIG. 11. FIG. 13 shows a cross-section of FIG. 12 in which the first inertia ring gear (95), the second inertia ring gear (96), the third inertia ring gear (105), and the fourth inertia ring gear (106) are further installed. FIG. 14 is partially modified from FIG. 3, with the auxiliary hub (63) removed, and further showing the first spline hub (64), the first spline hub arm (66), the second spline hub (67), the second spline hub helical male spline tooth section (68), the second spline hub arm (69), the first rotary link (111), the first rotary link hole (112), the second rotary link (114), and the second rotary link hole (115). Reference numerals 113 and 116 indicate positions on the first rotary link (111) and the second rotary link (114), respectively. FIG. 15 is partially modified from FIG. 4, with the auxiliary shaft (75) removed and the third spline shaft (76) and the third spline shaft helical arm type spline tooth (77) further shown. FIG. 16 shows a cross-section of the device shown in FIG. 15 installed in the center of the device shown in FIG. 14. However, the first rotary link (111) and the second rotary link (114) are excluded. Figure 17 shows the cross-section of each part spread out to aid in understanding Figure 16. FIG. 18 shows that the first ring gear (91) and the fifth ring gear (97) are installed on the first yoke (2). FIG. 19 shows that the third ring gear (101) and the sixth ring gear (107) are installed on the second yoke (22). FIG. 20 shows a cross-section cut by the plane formed by the center line of the central axis (78) and the straight line passing through the center of the first yoke pin (4) and the center of the second yoke pin (5) with respect to the combined device shown in FIG. 1, FIG. 2, FIG. 14, FIG. 15, FIG. 18, and FIG. 19. FIG. 21 shows that a second yoke ring (121) is installed between the second rotation axis (21) and the second yoke (22) of the device shown in FIG. 11. FIG. 22 shows a first crown ring (123) in which the first ring hole (8), second ring hole (9), fifth ring hole (10), and sixth ring hole (11) are protruded. FIG. 23 shows that a first yoke ring (122) is installed at one end of the first rotary link (111) shown in FIG. 14. FIG. 24 shows that a second yoke ring (121) is installed between the second rotation axis (21) and the second yoke (22) of the device shown in FIG. 19. FIG. 25 shows a second crown ring (124) in which a third ring hole (28), a fourth ring hole (29), a seventh ring hole (30), and an eighth ring hole (31) protrude, and a first ring pin (38) and a second ring pin (39) are installed. Specific details for implementing the invention

[0011] The specific details of the present invention will be explained in detail through the embodiments of the present invention shown in the attached drawings. However, the content of the present invention is not limited to what is shown in the drawings.

[0012] In FIG. 1, the first yoke (2), having a first yoke hole (6) and a second yoke hole (7) at both ends, is connected to the first rotation axis (1), and the first ring (3) has a first ring hole (8), a second ring hole (9), a fifth ring hole (10), and a sixth ring hole (11), and the first yoke hole (6) and the first ring hole (8) are connected by a first yoke pin (4), and the second yoke hole (7) and the second ring hole (9) are connected by a second yoke pin (5). The centerline of the first rotation axis (1), the straight line connecting the center of the first ring hole (8) and the center of the second ring hole (9), and the straight line connecting the center of the fifth ring hole (10) and the center of the sixth ring hole (11) meet at one point, and the straight line connecting the center of the first ring hole (8) and the center of the second ring hole (9) is perpendicular to the centerline of the first rotation axis (1) and the straight line connecting the center of the fifth ring hole (10) and the center of the sixth ring hole (11).

[0013] The two yoke pins (4, 5) revolve in the two yoke holes (6, 7) or the two ring holes (8, 9). Sliding bearings or rolling bearings, etc., may be used for the installation of the two yoke pins (4, 5).

[0014] In FIG. 2, the second yoke (22), having a third yoke hole (26) and a fourth yoke hole (27) at both ends, is connected to the second rotation axis (21), and the second ring (23) has a third ring hole (28), a fourth ring hole (29), a seventh ring hole (30), and an eighth ring hole (31). The third yoke hole (26) and the third ring hole (28) are connected by a third yoke pin (24), and the fourth yoke hole (27) and the fourth ring hole (29) are connected by a fourth yoke pin (25). One end of the first ring pin (38) is installed in the seventh ring hole (30), and one end of the second ring pin (39) is installed in the eighth ring hole (31). The centerline of the second rotation axis (21), the straight line connecting the center of the third ring hole (28) and the center of the fourth ring hole (29), and the straight line connecting the center of the seventh ring hole (30) and the center of the eighth ring hole (31) meet at one point, and the straight line connecting the center of the third ring hole (28) and the center of the fourth ring hole (29) is perpendicular to the centerline of the second rotation axis (21) and the straight line connecting the center of the seventh ring hole (30) and the center of the eighth ring hole (31).

[0015] The two yoke pins (24, 25) revolve in the two yoke holes (26, 27) or the two ring holes (28, 29). Sliding bearings or rolling bearings, etc., may be used for the installation of the two yoke pins (24, 25).

[0016] When the other end of the first ring pin (38) is installed in the fifth ring hole (10) of FIG. 1 and the other end of the second ring pin (39) is installed in the sixth ring hole (11) of FIG. 1, the first rotation axis (1) and the second rotation axis (21) are connected.

[0017] The two ring pins (38, 39) rotate in the two ring holes (10, 11) of the first ring (3) or the two ring holes (30, 31) of the second ring (23). Sliding bearings or rolling bearings, etc., may be used for the installation of the two ring pins (38, 39).

[0018] As described above, the first rotation axis (1) and the second rotation axis (21) connected can transmit rotational force, but constant speed rotation of the two rotation axes (1, 21) is not guaranteed. Constant speed rotation of the two rotation axes (1, 21) is possible when the straight line connecting the center of the first ring pin (38) and the center of the second ring pin (39) (hereinafter referred to as the 'ring center line') is at the center of the angle formed by the first rotation axis (1) and the second rotation axis (21). In other words, the angle between the ring center line and the first rotation axis (1) and the angle between the ring center line and the second rotation axis (21) must always be maintained together for the two rotation axes (1, 21) to rotate at a constant speed.

[0019] Of the components examined so far, the first rotation axis (1), the first yoke (2), the first ring (3), the first yoke pin (4), the second yoke pin (5), the second rotation axis (21), the second yoke (22), the second ring (23), the third yoke pin (24), the fourth yoke pin (25), the first ring pin (38), and the second ring pin (39) are responsible for transmitting rotational force between the first rotation axis (1) and the second rotation axis (21) and play a decisive role in the angle of cut, torque, and axial force limits. The rest mainly serve to prevent the ring centerline from deviating from the center of the angle formed by the first rotation axis (1) and the second rotation axis (21) and will not be significantly related to the angle of cut, torque, and axial force limits.

[0020] In FIG. 3, the first pinion (41) is a bevel gear, and the first pinion tooth portion (42) is indicated by drawing a circle around the circumference instead of drawing each tooth individually. Subsequently, all tooth portions are to be indicated by drawing a circle around the circumference. The gear teeth of a gear are also called teeth. The part of a gear containing the gear teeth is also called the tooth portion, gear tooth section, or gear rim, but here it will be referred to as the tooth portion.

[0021] A first pinion hub (43) is installed at the center of the first pinion (41), and a first pinion hub helical male spline tooth section (44) is formed inside the first pinion hub (43). The first pinion hub helical male spline tooth section (44) can be easily seen in FIG. 6.

[0022] The second pinion (46) is a bevel gear, and a second pinion hub (48) is installed at the center of the second pinion (46), and a second pinion hub helical male spline tooth section (49) is formed inside the second pinion hub (48).

[0023] The third pinion (51) is a bevel gear, and a third pinion hub (53) is installed at the center of the third pinion (51), and a third pinion hub helical male spline tooth section (54) is formed inside the third pinion hub (53).

[0024] The fourth pinion (56) is a bevel gear, and a fourth pinion hub (58) is installed at the center of the fourth pinion (56), and a fourth pinion hub helical male spline tooth section (59) is formed inside the fourth pinion hub (58).

[0025] An auxiliary hub (63) is installed between the third pinion hub (53) and the fourth pinion hub (58), a first pinion ring (61) is installed in the first pinion ring groove (45), and a second pinion ring (62) is installed in the second pinion ring groove (50).

[0026] In FIG. 4, a first spline shaft helical arm type spline tooth part (72) is formed on the outside of the first spline shaft (71), and a second spline shaft helical arm type spline tooth part (74) is formed on the outside of the second spline shaft (73). An auxiliary shaft (75) is installed between the first spline shaft (71) and the second spline shaft (73), and a central shaft (78) is installed to rotate at the center of the first spline shaft (71), the second spline shaft (73), and the auxiliary shaft (75). Central shaft rings (79, 80) are installed in the grooves at both ends of the central shaft (78), respectively, and the first spline shaft (71), the second spline shaft (73), the auxiliary shaft (75), the central shaft (78), the first central shaft ring (79), and the second central shaft ring (80) always move together up and down.

[0027] The first pinion ring (61), the second pinion ring (62), the first center axis ring (79), and the second center axis ring (80) can be snap rings or circlips.

[0028] In FIG. 5, the first pinion hub (43) is installed to rotate inside the first ring pin (38), and the first pinion hub helical male spline tooth (44) is engaged with the first spline shaft helical female spline tooth (72).

[0029] A second pinion hub (48) is installed to rotate inside the second ring pin (39), and the second pinion hub helical male spline tooth (49) engages with the second spline shaft helical female spline tooth (74).

[0030] The third pinion hub helical male spline tooth (54) engages with the first spline shaft helical female spline tooth (72), and

[0031] It is shown that the fourth pinion hub helical male spline tooth (59) is engaged with the second spline shaft helical female spline tooth (74).

[0032] The first pinion ring (61) installed in the first pinion ring groove (45) prevents the first pinion hub (43) from coming out of the first ring pin (38), and

[0033] The second pinion ring (62) installed in the second pinion ring groove (50) prevents the second pinion hub (48) from coming out of the second ring pin (39).

[0034] In FIG. 6, the relationship in which the first pinion hub helical male spline tooth portion (44) and the third pinion hub helical male spline tooth portion (54) mesh with the first spline shaft helical female spline tooth portion (72), and

[0035] The relationship in which the second pinion hub helical male spline tooth (49) and the fourth pinion hub helical male spline tooth (59) mesh with the second spline shaft helical female spline tooth (74) is shown in an easy-to-understand manner.

[0036] The left twist helical male spline tooth (82) of FIG. 7 and the right twist helical male spline tooth (84) of FIG. 8 can be used in the first pinion hub helical male spline tooth section (44), the second pinion hub helical male spline tooth section (49), the third pinion hub helical male spline tooth section (54), and the fourth pinion hub helical male spline tooth section (59).

[0037] The left twisted helical arm spline tooth (86) and the right twisted helical arm spline tooth (87) of FIG. 9 can be used in the first spline shaft helical arm spline tooth section (72) and the second spline shaft helical arm spline tooth section (74).

[0038] The left torsional helical male spline tooth (82) can be engaged with the left torsional helical female spline tooth (86), and the right torsional helical male spline tooth (84) can be engaged with the right torsional helical female spline tooth (87).

[0039] In FIG. 10, the first ring gear (91) and the second ring gear (93) are bevel gears, and the axis of rotation is on a straight line connecting the center of the first yoke hole (6) and the center of the second yoke hole (7), and the first ring gear tooth (92) is engaged with the first pinion tooth (42), and the second ring gear tooth (94) is engaged with the second pinion tooth (47).

[0040] In FIG. 11, the third ring gear (101) and the fourth ring gear (103) are bevel gears, and the axis of rotation is on a straight line connecting the center of the third yoke hole (26) and the center of the fourth yoke hole (27), and the third ring gear tooth (102) is engaged with the third pinion tooth (52), and the fourth ring gear tooth (104) is engaged with the fourth pinion tooth (57).

[0041] The first ring gear tooth section (92), the second ring gear tooth section (94), the third ring gear tooth section (102), and the fourth ring gear tooth section (104) each require only an arc portion with a center angle of approximately 90 to 110 degrees centered around the first pinion (41), the second pinion (46), the third pinion (51), and the fourth pinion (56). The first ring gear (91), the second ring gear (93), the third ring gear (101), and the fourth ring gear (103) do not need to have teeth formed on their entire lengths. However, a portion is required to be installed on the first yoke (2) or the second yoke (22) in any form.

[0042] FIG. 12 shows a state in which the first yoke (2), first ring (3), first yoke pin (4), second yoke pin (5), second yoke (22), second ring (23), third yoke pin (24), fourth yoke pin (25), first ring gear (91), first ring gear tooth part (92), second ring gear (93), second ring gear tooth part (94), third ring gear (101), and third ring gear tooth part (102) are further installed in FIG. 5. Also, it is shown that the first ring gear tooth (92) is engaged with the first pinion tooth (42), the second ring gear tooth (94) is engaged with the second pinion tooth (47), the third ring gear tooth (102) is engaged with the third pinion tooth (52), and the fourth ring gear tooth (104) is engaged with the fourth pinion tooth (57).

[0043] It is preferable that the gear ratio of the first pinion (41) and the first ring gear (91), the gear ratio of the second pinion (46) and the second ring gear (93), the gear ratio of the third pinion (51) and the third ring gear (101), and the gear ratio of the fourth pinion (56) and the fourth ring gear (103) are all the same.

[0044] In FIG. 12, the first pinion hub helical male spline tooth portion (44) and the third pinion hub helical male spline tooth portion (54) are opposite to each other torsional helical male spline teeth, and

[0045] The second pinion hub helical male spline tooth section (49) and the fourth pinion hub helical male spline tooth section (59) are opposite to each other torsion helical male spline teeth, and

[0046] The first pinion hub helical male spline tooth section (44) and the second pinion hub helical male spline tooth section (49) are likewise twisted helical male spline teeth, and

[0047] The first spline shaft helical female spline tooth section (72) and the second spline shaft helical female spline tooth section (74) are left and right twisted helical female spline teeth.

[0048] A left-twisted helical male spline tooth (82) or a right-twisted helical male spline tooth (84) may be formed on the first pinion hub helical male spline tooth section (44).

[0049] If you choose to form a right-twisted helical spline tooth (84) on the first pinion hub helical spline tooth section (44),

[0050] A right-twisted helical spline tooth (84) must also be formed on the second pinion hub helical male spline tooth section (49), and

[0051] Left twist helical male spline teeth (82) must be formed on the third pinion hub helical male spline tooth section (54) and the fourth pinion hub helical male spline tooth section (59), and

[0052] As shown in FIG. 9, a left twisted helical arm spline tooth (86) and a right twisted helical arm spline tooth (87) must be formed simultaneously in the first spline shaft helical arm spline tooth section (72) and the second spline shaft helical arm spline tooth section (74).

[0053] If a left-twisted helical male spline tooth (82) is formed on the first pinion hub helical male spline tooth section (44), a left-twisted helical male spline tooth (82) is formed on the second pinion hub helical male spline tooth section (49), and a right-twisted helical male spline tooth (84) is formed on the third pinion hub helical male spline tooth section (54) and the fourth pinion hub helical male spline tooth section (59).

[0054] For convenience in explaining the operation through FIG. 12, we will examine the case where the first rotation axis (1) and the second rotation axis (21) are aligned horizontally and the center axis (78) is in a vertical state (hereinafter referred to as the "straight line state"), and the first rotation axis (1) and the second rotation axis (21) are each bent upward at the same angle with the straight line connecting the center of the first yoke pin (4) and the center of the second yoke pin (5) and the straight line connecting the center of the third yoke pin (24) and the center of the fourth yoke pin (25) as rotation axes (hereinafter referred to as "upward bending." If bent downward, it is referred to as "downward bending"), and the case where the first rotation axis (1) and the second rotation axis (21) are each bent to the left at the same angle with the center axis (78) as rotation axes (hereinafter referred to as "leftward bending." If bent to the right, it is referred to as "rightward bending"). When looking down from the top of the first pinion (41) to where the second pinion (46) is located, leftward deflection means that the first rotation axis (1) rotates to the left and the second rotation axis (21) rotates to the right.

[0055] In describing directions below, the direction that protrudes out of the ground or rises up is called the 'Protrusion Direction' or 'Out-of-Plane Direction,' and the direction that penetrates into the ground or sinks in is called the 'Penetration Direction' or 'Into-Plane Direction.'

[0056] When the first rotation axis (1) and the second rotation axis (21) are in a straight line and bend upward, the first ring gear (91) and the fourth ring gear (103) move in the protruding direction, the second ring gear (93) and the third ring gear (101) move in the penetrating direction, the first pinion (41) and the third pinion (51) turn right, and the second pinion (46) and the fourth pinion (56) turn left.

[0057] When the first pinion (41) and the third pinion (51) rotate to the right at the same angle, the first spline shaft (71) rotates to the right at the same angle, and the first spline shaft (71) does not move up or down.

[0058] When the second pinion (46) and the fourth pinion (56) turn left at the same angle, the second spline shaft (73) turns left at the same angle, and the second spline shaft (73) does not move up or down.

[0059] If the first spline axis (71) and the second spline axis (73) do not move up and down, the auxiliary axis (75) and the central axis (78) do not move up and down. Upward bending is performed without any resistance or abnormalities.

[0060] We will also examine the case where the first rotation axis (1) and the second rotation axis (21) are in a straight line and bend upward at different angles, or where only one of the first rotation axis (1) and the second rotation axis (21) bends upward.

[0061] When the first rotation axis (1) and the second rotation axis (21) are in a straight line and only the first rotation axis (1) is bent upward, the first ring gear (91) moves in the protruding direction and the second ring gear (93) moves in the penetrating direction, respectively, the third ring gear (101) and the fourth ring gear (103) do not move, the first pinion (41) rotates to the right and the second pinion (46) rotates to the left, and the third pinion (51) and the fourth pinion (56) do not rotate.

[0062] If the first pinion (41) rotates to the right and the third pinion (51) does not rotate, the first spline shaft (71) rotates to the right by half the angle of rotation of the first pinion (41) and moves downward,

[0063] If the second pinion (46) rotates left and the fourth pinion (56) does not rotate, the second spline shaft (73) rotates left by half the left rotation angle of the second pinion (46) and moves upward, and

[0064] Since the first spline shaft (71) must move downward but the second spline shaft (73) must move upward, the first spline shaft (71) and the second spline shaft (73) cannot move, the first pinion (41) cannot turn right, the second pinion (46) cannot turn left, and consequently, the first rotation shaft (1) cannot bend upward.

[0065] When examining the case where the first rotation axis (1) and the second rotation axis (21) are in a straight line and are bent downward, compared to the upward bending above,

[0066] The four ring gears (91, 103, 93, 101) move in opposite directions, and

[0067] The four pinions (41, 51, 46, 56) rotate in opposite directions, and

[0068] The two spline axes (71, 73) rotate in opposite directions and do not move up and down,

[0069] The auxiliary axis (75) and the central axis (78) do not move up and down, and the first rotation axis (1) and the second rotation axis (21) perform downward bending.

[0070] When the first rotation axis (1) and the second rotation axis (21) are in a straight line and undergo leftward bending, the first ring gear (91), the second ring gear (93), the third ring gear (101), and the fourth ring gear (103) each move in the protruding direction, and the first pinion (41) and the second pinion (46) turn right, and the third pinion (51) and the fourth pinion (56) turn left.

[0071] When the first pinion (41) rotates to the right and the third pinion (51) rotates to the left at the same angle, the first spline shaft (71) does not rotate and moves downward, and

[0072] When the second pinion (46) rotates to the right and the fourth pinion (56) rotates to the left at the same angle, the second spline shaft (73) does not rotate and moves downward, and

[0073] The first spline axis (71) and the second spline axis (73) move downward by the same distance, and

[0074] The auxiliary axis (75) and the central axis (78) move together downward. Leftward deflection is performed without any resistance or abnormalities.

[0075] When examining the case where the first rotation axis (1) and the second rotation axis (21) are in a straight line and are bent to the right, compared to the left bend

[0076] The four ring gears (91, 93, 101, 103) move in opposite directions, and

[0077] The four pinions (41, 46, 51, 56) rotate in opposite directions, and

[0078] The two spline axes (71, 73) do not rotate and move in opposite directions, and

[0079] The auxiliary axis (75) and the central axis (78) move in opposite directions, and the first rotation axis (1) and the second rotation axis (21) are bent to the right.

[0080] Upward and downward bending are performed regardless of the vertical movement of the first spline axis (71) and the second spline axis (73), while leftward and rightward bending are performed in relation to the vertical movement of the first spline axis (71) and the second spline axis (73). Thus, upward or downward bending and leftward or rightward bending can be performed independently of each other or simultaneously.

[0081] For convenience, we have examined the situation so far where the first rotation axis (1) and the second rotation axis (21) are aligned horizontally and the central axis (78) is vertical. However, even when examining the situation where the first rotation axis (1) and the second rotation axis (21) are not aligned horizontally and the central axis (78) is not vertical, it is clear that the first rotation axis (1) and the second rotation axis (21) are deflected upward or downward at the same angle relative to the central axis (78). Furthermore, it is clear that this will be the same even when the first rotation axis (1), the second rotation axis (21), and the central axis (78) are rotating together.

[0082] The ring centerline coincides with the centerline of the center axis (78). The ring centerline is always positioned at the center of the angle formed by the first rotation axis (1) and the second rotation axis (21), so that the first rotation axis (1) and the second rotation axis (21) rotate at a constant speed.

[0083] In FIGS. 10 and FIGS. 12, the first ring gear (91) and the second ring gear (93) installed on the first yoke (2) of the first rotation axis (1) are not arranged symmetrically with respect to the center axis of the first rotation axis (1). This can cause problems such as vibration when the first rotation axis (1) rotates. This problem can be solved by making the first inertia ring gear (95) and the second inertia ring gear (96) in a shape similar to the first ring gear (91) and the second ring gear (93) and installing them in appropriate positions. In FIG. 10, the first ring gear (91) is installed at the position indicated by reference numeral 12 in FIG. 1, and the second ring gear (93) is installed at the position indicated by reference numeral 15. The first inertia ring gear (95) can be installed at the position indicated by reference numeral 13, and the second inertia ring gear (96) can be installed behind the position indicated by reference numeral 15 and below the position indicated by reference numeral 13.

[0084] Figure 13 shows a cross-section of the result of this execution, in which the first inertia ring gear (95) does not mesh with the first pinion (41), and the second inertia ring gear (96) does not mesh with the second pinion (46).

[0085] Likewise, in FIGS. 11 and 12, the third ring gear (101) and the fourth ring gear (103) installed on the second yoke (22) of the second rotation axis (21) are not arranged symmetrically with respect to the center axis of the second rotation axis (21). This can cause problems such as vibration when the second rotation axis (21) rotates. This problem can be solved by making the third inertia ring gear (105) and the fourth inertia ring gear (106) in a shape similar to the third ring gear (101) and the fourth ring gear (103) and installing them in appropriate positions. In FIG. 11, a third ring gear (101) is installed at the position of reference numeral 33 indicated in FIG. 2, and a fourth ring gear (103) is installed behind the position of reference numeral 35 and below the position of reference numeral 33. Then, a third inertia ring gear (105) is installed at the position of reference numeral 32, and a fourth inertia ring gear (106) is installed at the position of reference numeral 35.

[0086] Figure 13 shows a cross-section of the result of this execution, in which the third inertia ring gear (105) does not mesh with the third pinion (51), and the fourth inertia ring gear (106) does not mesh with the fourth pinion (56).

[0087] In FIG. 14, a first spline hub (64) is used in which a first spline hub helical male spline tooth section (65) is formed inside and a first spline hub arm (66) is installed outside, in place of the auxiliary hub (63), and a second spline hub (67) is used in which a second spline hub helical male spline tooth section (68) is formed inside and a second spline hub arm (69) is installed outside.

[0088] The first spline hub (64) and the second spline hub (67) are installed between the third pinion hub (53) and the fourth pinion hub (58).

[0089] The first rotary link hole (112) of the first rotary link (111) is installed in rotation on the first spline hub arm (66), and the portion indicated by the symbol 113 of the first rotary link (111) is installed in the center of the first yoke (2).

[0090] The second rotary link hole (115) of the second rotary link (114) is installed in rotation on the second spline hub arm (69), and the portion indicated by the symbol 116 of the second rotary link (114) is installed in the center of the second yoke (22).

[0091] In FIG. 15, a third spline shaft (76) is used in which a third spline shaft helical arm type spline tooth portion (77) is formed externally in place of the auxiliary shaft (75), with a portion of FIG. 4 modified. A central shaft (78) is installed to rotate at the center of the first spline shaft (71), the second spline shaft (73), and the third spline shaft (76), and central shaft rings (79, 80) are installed in the grooves at both ends of the central shaft (78), respectively, and the first spline shaft (71), the second spline shaft (73), the third spline shaft (76), the central shaft (78), the first central shaft ring (79), and the second central shaft ring (80) always move together up and down.

[0092] FIG. 16 shows that, in FIG. 5, some parts are modified so that the auxiliary hub (63) and auxiliary shaft (75) are removed, and instead, the first spline hub helical male spline tooth (65) inside the first spline hub (64) and the second spline hub helical male spline tooth (68) inside the second spline hub (67) are engaged with the third spline shaft helical female spline tooth (77) outside the third spline shaft (76).

[0093] In FIG. 17, the relationship in which the first pinion hub helical male spline tooth portion (44) and the third pinion hub helical male spline tooth portion (54) mesh with the first spline shaft helical female spline tooth portion (72), and

[0094] The relationship in which the second pinion hub helical male spline tooth (49) and the fourth pinion hub helical male spline tooth (59) mesh with the second spline shaft helical female spline tooth (74), and

[0095] The relationship in which the first spline hub helical male spline tooth (65) and the second spline hub helical male spline tooth (68) mesh with the third spline shaft helical female spline tooth (77) is shown in an easy-to-understand manner.

[0096] A left-twisted helical male spline tooth (82) or a right-twisted helical male spline tooth (84) may be used in the first spline hub helical male spline tooth section (65) and the second spline hub helical male spline tooth section (68), and a left-twisted helical female spline tooth (86) and a right-twisted helical female spline tooth (87) may be used in the third spline shaft helical female spline tooth section (77).

[0097] In FIG. 18, the fifth ring gear (97) is a bevel gear, and the rotational axis of the first ring gear (91) and the fifth ring gear (97) lies on a straight line connecting the center of the first yoke hole (6) and the center of the second yoke hole (7), and the first ring gear tooth (92) meshes with the first pinion tooth (42), and the fifth ring gear tooth (98) meshes with the second pinion tooth (47).

[0098] In FIG. 19, the sixth ring gear (107) is a bevel gear, and the rotational axis of the third ring gear (101) and the sixth ring gear (107) lies on a straight line connecting the center of the third yoke hole (26) and the center of the fourth yoke hole (27), and the third ring gear tooth (102) meshes with the third pinion tooth (52), and the sixth ring gear tooth (108) meshes with the fourth pinion tooth (57).

[0099] The first ring gear tooth section (92), the fifth ring gear tooth section (98), the third ring gear tooth section (102), and the sixth ring gear tooth section (108) each require only an arc portion with a center angle of approximately 90 to 110 degrees centered around the first pinion (41), the second pinion (46), the third pinion (51), and the fourth pinion (56). The first ring gear (91), the fifth ring gear (97), the third ring gear (101), and the sixth ring gear (107) do not need to have teeth formed on their entire lengths. However, a portion is required to be installed on the first yoke (2) or the second yoke (22) in any form.

[0100] FIG. 20 shows a cross-section of FIG. 12 in which parts are modified so that the auxiliary hub (63), auxiliary shaft (75), second ring gear (93), and fourth ring gear (103) are removed, and the first spline hub (64), second spline hub (67), third spline shaft (76), fifth ring gear (97), and sixth ring gear (107) are additionally installed. The first ring gear tooth (92) is engaged with the first pinion tooth (42), the third ring gear tooth (102) is engaged with the third pinion tooth (52), the fifth ring gear tooth (98) is engaged with the second pinion tooth (47), the sixth ring gear tooth (108) is engaged with the fourth pinion tooth (57), the first spline hub helical male spline tooth (65) and the second spline hub helical male spline tooth (68) are engaged with the third spline shaft helical female spline tooth (77), the first rotary link (111) is connected to the first spline hub arm (66) through the first rotary link hole (112), and the second rotary link is connected to the second spline hub arm (69). It is shown that the second rotary link (114) is connected through the hole (115).

[0101] It is preferable that the gear ratio of the first pinion (41) and the first ring gear (91), the gear ratio of the third pinion (51) and the third ring gear (101), the gear ratio of the second pinion (46) and the fifth ring gear (97), and the gear ratio of the fourth pinion (56) and the sixth ring gear (107) are all the same.

[0102] In FIG. 20, the first pinion hub helical male spline tooth portion (44) and the third pinion hub helical male spline tooth portion (54) are opposite to each other torsional helical male spline teeth, and

[0103] The second pinion hub helical male spline tooth section (49) and the fourth pinion hub helical male spline tooth section (59) are opposite to each other torsion helical male spline teeth, and

[0104] The first spline hub helical male spline tooth section (65) and the second spline hub helical male spline tooth section (68) are opposite to each other torsion helical male spline teeth, and

[0105] The first pinion hub helical male spline tooth section (44), the second pinion hub helical male spline tooth section (49), and the first spline hub helical male spline tooth section (65) are same-sided torsional helical male spline teeth, and

[0106] The first spline shaft helical female spline tooth section (72), the second spline shaft helical female spline tooth section (74), and the third spline shaft helical female spline tooth section (77) are left and right twisted helical female spline teeth.

[0107] A left-twisted helical male spline tooth (82) or a right-twisted helical male spline tooth (84) may be formed on the first pinion hub helical male spline tooth section (44).

[0108] If you choose to form a right-twisted helical spline tooth (84) on the first pinion hub helical spline tooth section (44),

[0109] Right twist helical male spline teeth (84) must also be formed on the second pinion hub helical male spline tooth section (49) and the first spline hub helical male spline tooth section (65), and

[0110] Left twist helical male spline teeth (82) must be formed on the third pinion hub helical male spline tooth section (54), the fourth pinion hub helical male spline tooth section (59), and the second spline hub helical male spline tooth section (68).

[0111] As shown in FIG. 9, left twisted helical arm spline teeth (86) and right twisted helical arm spline teeth (87) must be formed simultaneously in the first spline shaft helical arm spline teeth (72), the second spline shaft helical arm spline teeth (74), and the third spline shaft helical arm spline teeth (77).

[0112] If a left-twisted helical male spline tooth (82) is formed on the first pinion hub helical male spline tooth section (44), a left-twisted helical male spline tooth (82) is formed on the second pinion hub helical male spline tooth section (49) and the first spline hub helical male spline tooth section (65), and a right-twisted helical male spline tooth (84) is formed on the third pinion hub helical male spline tooth section (54), the fourth pinion hub helical male spline tooth section (59), and the second spline hub helical male spline tooth section (68).

[0113] For convenience in explaining the operation through FIG. 20, we will examine the case where the first rotation axis (1) and the second rotation axis (21) are in a straight line, and the case where the first rotation axis (1) and the second rotation axis (21) are bent upward and the case where the first rotation axis (1) and the second rotation axis (21) are bent to the left.

[0114] When the first rotation axis (1) and the second rotation axis (21) are in a straight line and bend upward, the first ring gear (91) and the sixth ring gear (107) move in the protruding direction, and the fifth ring gear (97) and the third ring gear (101) move in the penetrating direction, respectively.

[0115] The 113 portion of the first rotary link (111) and the 116 portion of the second rotary link (114) move upward, respectively, the first pinion (41) and the fourth pinion (56) rotate to the right, and the second pinion (46) and the third pinion (51) rotate to the right. The first spline hub (64) and the second spline hub (67) do not rotate.

[0116] When the first pinion (41) and the third pinion (51) rotate to the right at the same angle, the first spline shaft (71) rotates to the right at the same angle, and the first spline shaft (71) does not move up or down.

[0117] When the second pinion (46) and the fourth pinion (56) rotate to the right at the same angle, the second spline shaft (73) rotates to the right at the same angle, and the second spline shaft (73) does not move up or down.

[0118] If the first spline hub (64) and the second spline hub (67) do not rotate, the third spline shaft (76) does not rotate and does not move up and down.

[0119] If the first spline axis (71), the second spline axis (73), and the third spline axis (76) do not move up and down, the center axis (78) does not move up and down.

[0120] Upward refraction is performed without any resistance or abnormalities.

[0121] We will also examine the case where the first rotation axis (1) and the second rotation axis (21) are in a straight line and bend upward at different angles, or where only one of the first rotation axis (1) and the second rotation axis (21) bends upward.

[0122] When the first rotation axis (1) and the second rotation axis (21) are in a straight line and only the first rotation axis (1) bends upward, the first ring gear (91) moves in the protruding direction and the fifth ring gear (97) moves in the penetrating direction, respectively, the third ring gear (101) and the sixth ring gear (107) do not move, the 113 portion of the first rotary link (111) moves upward and the 116 portion of the second rotary link (114) does not move, the first pinion (41) and the second pinion (46) turn right, and the third pinion (51), the fourth pinion (56), the first spline hub (64), and the second spline hub (67) do not rotate.

[0123] If the first pinion (41) rotates to the right and the third pinion (51) does not rotate, the first spline shaft (71) rotates to the right by half the angle of rotation of the first pinion (41) and moves downward,

[0124] If the second pinion (46) rotates to the right and the fourth pinion (56) does not rotate, the second spline shaft (73) rotates to the right by half the angle of rotation of the second pinion (46) and moves downward, and

[0125] If the first spline hub (64) and the second spline hub (67) do not rotate, the third spline shaft (76) does not rotate and does not move up and down.

[0126] The first spline shaft (71) and the second spline shaft (73) must move downward, but since the third spline shaft (76) does not move up and down, the first spline shaft (71) and the second spline shaft (73) cannot move, the first pinion (41) and the second pinion (46) cannot turn right, and consequently, the first rotation axis (1) cannot bend upward.

[0127] When examining the case where the first rotation axis (1) and the second rotation axis (21) are in a straight line and are bent downward, compared to the upward bending above,

[0128] The four ring gears (91, 107, 97, 101) move in opposite directions, and

[0129] The 113 portion of the first rotary link (111) and the 116 portion of the second rotary link (114) move in opposite directions, the two spline hubs (64, 67) do not rotate, the third spline shaft (76) does not rotate and does not move up and down,

[0130] The four pinions (41, 56, 46, 51) rotate in opposite directions, and

[0131] The two spline axes (71, 73) rotate in opposite directions and do not move up and down,

[0132] The central axis (78) does not move up and down, and the first rotation axis (1) and the second rotation axis (21) are bent downward.

[0133] When the first rotation axis (1) and the second rotation axis (21) are in a straight line and undergo leftward bending, the first ring gear (91) and the third ring gear (101) each move in the protruding direction, the fifth ring gear (97) and the sixth ring gear (107) each move in the penetrating direction, the first rotary link (111) and the first spline hub (64) turn right, the second rotary link (114) and the second spline hub (67) turn left, the first pinion (41) and the second pinion (46) turn right, and the third pinion (51) and the fourth pinion (56) turn left.

[0134] When the first pinion (41) rotates to the right and the third pinion (51) rotates to the left at the same angle, the first spline shaft (71) does not rotate and moves downward, and

[0135] When the second pinion (46) rotates to the right and the fourth pinion (56) rotates to the left at the same angle, the second spline shaft (73) does not rotate and moves downward, and

[0136] When the first spline hub (64) rotates to the right and the second spline hub (67) rotates to the left at the same angle, the third spline shaft (76) does not rotate and moves downward, and

[0137] The first spline axis (71), the second spline axis (73), and the third spline axis (76) move down by the same distance,

[0138] The central axis (78) also moves downward together. Leftward deflection is performed without any resistance or abnormalities.

[0139] When examining the case where the first rotation axis (1) and the second rotation axis (21) are in a straight line and are bent to the right, compared to the left bend

[0140] The four ring gears (91, 101, 97, 107) move in opposite directions, and

[0141] The two rotary links (111, 114) and the two spline hubs (64, 67) rotate in opposite directions, and

[0142] The third spline axis (76) does not rotate and moves in the opposite direction, and

[0143] The four pinions (41, 46, 51, 56) rotate in opposite directions, and

[0144] The two spline axes (71, 73) do not rotate and move in opposite directions, and

[0145] The central axis (78) moves in the opposite direction, and the first rotation axis (1) and the second rotation axis (21) are bent to the right.

[0146] Upward and downward bending are performed regardless of the vertical movement of the first spline axis (71), the second spline axis (73), and the third spline axis (76), while leftward and rightward bending are performed in relation to the vertical movement of the first spline axis (71), the second spline axis (73), and the third spline axis (76). Thus, upward or downward bending and leftward or rightward bending can be performed independently of each other or simultaneously.

[0147] For convenience, we have examined the situation so far where the first rotation axis (1) and the second rotation axis (21) are aligned horizontally and the central axis (78) is vertical. However, even when examining the situation where the first rotation axis (1) and the second rotation axis (21) are not aligned horizontally and the central axis (78) is not vertical, it is clear that the first rotation axis (1) and the second rotation axis (21) are deflected upward or downward at the same angle relative to the central axis (78). Furthermore, it is clear that this will be the same even when the first rotation axis (1), the second rotation axis (21), and the central axis (78) are rotating together.

[0148] The ring centerline coincides with the centerline of the center axis (78). The ring centerline is always positioned at the center of the angle formed by the first rotation axis (1) and the second rotation axis (21), so that the first rotation axis (1) and the second rotation axis (21) rotate at a constant speed.

[0149] When the device of FIG. 10 and FIG. 11 is used, if the first rotation axis (1) and the second rotation axis (21) are bent to the left or right at the same angle with respect to the center axis (78) as the rotation axis, one end of the first yoke (2) or the first ring (3) will come into contact with the second rotation axis (21) before the angle between the first rotation axis (1) and the second rotation axis (21) reaches 90 degrees.

[0150] FIG. 21 shows that a second yoke ring (121) is installed between the second rotation axis (21) and the second yoke (22) of FIG. 11, and

[0151] FIG. 22 shows a first crown ring (123) in which the first ring (3) shown in FIG. 1 is modified to have a first ring hole (8), a second ring hole (9), a fifth ring hole (10), and a sixth ring hole (11) protruding. When these are used, the first end of the first yoke (2) or the first crown ring (123) does not collide with the second rotation axis (21) or the second yoke ring (121) until the angle between the first rotation axis (1) and the second rotation axis (21) reaches 90 degrees. The shape of the first crown ring (123) is not limited to that shown in FIG. 22. For example, the two ring holes (10, 11) do not have to be in a protruding shape.

[0152] When the device of FIG. 18 and FIG. 19 is used and the first rotary link (111) and the second rotary link (114) are used, when the first rotation axis (1) and the second rotation axis (21) are bent to the left or right at the same angle with respect to the center axis (78) as the rotation axis, one end of the first yoke (2) or the first ring (3) strikes the second rotation axis (21) before the angle between the first rotation axis (1) and the second rotation axis (21) reaches 90 degrees, and one end of the second yoke (22) or the second ring (23) strikes the first rotary link (111).

[0153] FIG. 23 shows a first yoke ring (122) installed at one end of a first rotary link (111), and the first rotary link (111) is installed through the first yoke ring (122) on the first yoke (2) of FIG. 18, and

[0154] FIG. 24 shows that a second yoke ring (121) is installed between the second rotation axis (21) and the second yoke (22) of FIG. 19, and

[0155] FIG. 25 shows a second crown ring (124) in which the second ring (23) shown in FIG. 2 is modified to have a third ring hole (28), a fourth ring hole (29), a seventh ring hole (30), and an eighth ring hole (31) protruding, with the first ring pin (38) and the second ring pin (39) installed thereon. When these are used together with the first crown ring (123) of FIG. 22, the angle between the first rotation axis (1) and the second rotation axis (21) is 90 degrees, so that one end of the first yoke (2) or the first crown ring (123) does not collide with the second rotation axis (21) or the second yoke ring (121), and one end of the second yoke (22) or the second crown ring (124) does not collide with the first rotary link (111) or the first yoke ring (122). The shape of the second crown ring (124) is not limited to that shown in FIG. 25. For example, the two ring holes (30, 31) do not have to be in a protruding shape.

[0156] Through these things, the angle between the first rotation axis (1) and the second rotation axis (21) can be bent up to 90 degrees.

[0157] When the angle between the first rotation axis (1) and the second rotation axis (21) reaches 90 degrees, rotational force cannot be effectively transmitted between the two rotation axes (1, 21). However, the constant velocity joint bending up to 90 degrees is not meaningless. This is because force can be transmitted through other external paths, causing the two rotation axes (1, 21) to rotate. In a vehicle using a constant velocity joint, the vehicle can move by means of a wheel connected to a constant velocity joint that is not bent up to 90 degrees, and at that time, the wheel connected to the constant velocity joint that is bent to 90 degrees can also rotate. Industrial applicability

[0158] The constant velocity joint according to the present invention has characteristics of being easy to manufacture and having a large angle of bending, so it can be easily utilized in any device having a rotating axis that requires bending, including airplanes, helicopters, automobiles, ships, and submarines. Explanation of the symbols

[0159] 1: First rotation axis. 2: First yoke. 3: First ring. 4: First yoke pin. 5: Second yoke pin. 6: First yoke hole. 7: Second yoke hole. 8: First ring hole. 9: Second ring hole. 10: Fifth ring hole. 11: Sixth ring hole. 21: Second rotation axis. 22: Second yoke. 23: Second ring. 24: Third yoke pin. 25: Fourth yoke pin. 26: Third yoke hole. 27: Fourth yoke hole. 28: Third ring hole. 29: Fourth ring hole. 30: Seventh ring hole. 31: Eighth ring hole. 38: First ring pin. 39: Second ring pin. 41: First pinion. 42: First pinion tooth section. 43: First pinion hub. 44: First pinion hub helical male spline tooth section. 45: First pinion ring groove. 46: Second pinion. 47: Second pinion tooth section. 48: Second pinion hub. 49: Second pinion hub helical male spline tooth section. 50: Second pinion ring groove. 51: Third pinion. 52: Third pinion tooth section. 53: Third pinion hub. 54: Third pinion hub helical male spline tooth section. 56: Fourth pinion. 57: Fourth pinion tooth section. 58: Fourth pinion hub. 59: Fourth pinion hub helical male spline tooth section. 61: First pinion ring. 62: Second pinion ring. 63: Auxiliary hub. 64: First spline hub. 65: First spline hub helical male spline tooth section. 66: First spline hub arm. 67: Second spline hub. 68: Second spline hub helical male spline tooth section. 69: Second spline hub arm. 71: First spline shaft. 72: First spline shaft helical female spline tooth section. 73: Second spline shaft. 74: Second spline shaft helical female spline tooth section. 75: Auxiliary shaft. 76: Third spline shaft. 77: Third spline shaft helical female spline tooth section. 78: Center shaft. 79: First center shaft ring. 80: Second center shaft ring. 81: Left-twisted helical male spline hub.82: Left-handed helical male spline tooth. 83: Right-handed helical male spline hub. 84: Right-handed helical male spline tooth. 85: Left-right helical female spline shaft. 86: Left-handed helical female spline tooth. 87: Right-handed helical female spline tooth. 91: First ring gear. 92: First ring gear tooth section. 93: Second ring gear. 94: Second ring gear tooth section. 95: First inertia ring gear. 96: Second inertia ring gear. 97: Fifth ring gear. 98: Fifth ring gear tooth section. 101: Third ring gear. 102: Third ring gear tooth section. 103: Fourth ring gear. 104: Fourth ring gear tooth section. 105: 3rd inertia ring gear. 106: 4th inertia ring gear. 107: 6th ring gear. 108: 6th ring gear tooth section. 111: 1st rotary link. 112: 1st rotary link hole. 114: 2nd rotary link. 115: 2nd rotary link hole. 121: 2nd yoke ring. 122: 1st yoke ring. 123: 1st crown ring. 124: 2nd crown ring.

Claims

Claim 1 In a constant velocity joint, a first yoke connected to a first rotation axis and having a first yoke hole and a second yoke hole at each of the left and right ends; a first ring having a first ring hole and a second ring hole at each of the left and right ends, and a fifth ring hole and a sixth ring hole at each of the top and bottom; a second yoke connected to a second rotation axis and having a third yoke hole and a fourth yoke hole at each of the left and right ends, and a second ring having a third ring hole and a fourth ring hole at each of the left and right ends, and a seventh ring hole and an eighth ring hole at each of the top and bottom; a first pinion with a first pinion hub installed at the center, having a first pinion hub helical male spline tooth section formed therein; a second pinion with a second pinion hub installed at the center, having a second pinion hub helical male spline tooth section formed therein; a third pinion with a third pinion hub installed at the center, having a third pinion hub helical male spline tooth section formed therein; and a fourth A fourth pinion with a fourth pinion hub having a helical male spline tooth formed thereon installed at the center; a first spline shaft with a helical female spline tooth formed thereon on the outside; a second spline shaft with a helical female spline tooth formed thereon on the outside; and a first ring gear and a second ring gear installed on the first yoke, and a third ring gear and a fourth ring gear installed on the second yoke;Including, wherein the first yoke hole and the first ring hole are connected to a first yoke pin, the second yoke hole and the second ring hole are connected to a second yoke pin, the third yoke hole and the third ring hole are connected to a third yoke pin, the fourth yoke hole and the fourth ring hole are connected to a fourth yoke pin, the fifth ring hole and the seventh ring hole are connected to a first ring pin, and the sixth ring hole and the eighth ring hole are connected to a second ring pin, and the first pinion hub and the third pinion hub are installed on the outside of the first spline shaft, so that the first pinion hub helical male spline tooth and the third pinion hub helical male spline tooth engage with the first spline shaft helical female spline tooth, and the first pinion hub is installed to orbit the center of the first ring pin, and the second pinion hub and the A constant velocity joint characterized by the installation of a fourth pinion hub, wherein the second pinion hub helical male spline tooth and the fourth pinion hub helical male spline tooth engage with the second spline shaft helical female spline tooth, the second pinion hub is installed to orbit the center of the second ring pin, the first ring gear engages with the first pinion, the second ring gear engages with the second pinion, the third ring gear engages with the third pinion, and the fourth ring gear engages with the fourth pinion. Claim 2 In a constant velocity joint, a first yoke connected to a first rotation axis and having a first yoke hole and a second yoke hole at each of the left and right ends; a first ring having a first ring hole and a second ring hole at each of the left and right ends, and a fifth ring hole and a sixth ring hole at each of the top and bottom; a second yoke connected to a second rotation axis and having a third yoke hole and a fourth yoke hole at each of the left and right ends, and a second ring having a third ring hole and a fourth ring hole at each of the left and right ends, and a seventh ring hole and an eighth ring hole at each of the top and bottom; a first pinion with a first pinion hub installed at the center, having a first pinion hub helical male spline tooth section formed therein; a second pinion with a second pinion hub installed at the center, having a second pinion hub helical male spline tooth section formed therein; a third pinion with a third pinion hub installed at the center, having a third pinion hub helical male spline tooth section formed therein; and a fourth A fourth pinion with a fourth pinion hub having a pinion hub helical male spline tooth formed thereon installed at the center; a first spline hub with a first spline hub arm installed on the outside and a first spline hub helical male spline tooth formed thereon on the inside; a second spline hub with a second spline hub arm installed on the outside and a second spline hub helical male spline tooth formed thereon on the inside; a first spline shaft with a first spline shaft helical female spline tooth formed thereon; a second spline shaft with a second spline shaft helical female spline tooth formed thereon; a third spline shaft with a third spline shaft helical female spline tooth formed thereon; a first ring gear and a fifth ring gear installed on the first yoke, and a third ring gear and a sixth ring gear installed on the second yoke; and a first rotary link and a second rotary link; wherein the first yoke hole and the first ring hole are a first yoke pin, the second yoke hole and the second ring hole are a second yoke pin, the third yoke hole and the third ring hole are a third yoke pin, and the fourth yoke hole and the fourth ring hole are a fourth yoke pin.The fifth ring hole and the seventh ring hole are respectively connected to the first ring pin, and the sixth ring hole and the eighth ring hole are respectively connected to the second ring pin; the first pinion hub and the third pinion hub are installed on the outside of the first spline shaft, so that the first pinion hub helical male spline tooth and the third pinion hub helical male spline tooth engage with the first spline shaft helical female spline tooth, and the first pinion hub is installed to revolve around the center of the first ring pin; the second pinion hub and the fourth pinion hub are installed on the outside of the second spline shaft, so that the second pinion hub helical male spline tooth and the fourth pinion hub helical male spline tooth engage with the second spline shaft helical female spline tooth, and the second pinion hub is the second ring The first spline hub and the second spline hub are installed on the outside of the third spline shaft, which is installed orbitally at the center of the pin and is installed between the first spline shaft and the second spline shaft, such that the first spline hub helical male spline tooth and the second spline hub helical male spline tooth engage with the third spline shaft helical female spline tooth, one end of the first rotary link is installed on the first spline hub arm and the other end is installed on the first yoke, one end of the second rotary link is installed on the second spline hub arm and the other end is installed on the second yoke, the first ring gear engages with the first pinion, the fifth ring gear engages with the second pinion, the third ring gear engages with the third pinion, and the sixth ring gear engages with the fourth pinion Constant velocity joint characterized by interlocking.

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