Universal joint

Abstract

To provide a universal joint that suppresses generation of a non-uniform motion.SOLUTION: A universal joint according to the present invention does not use a cross shaft of a cardan joint as an intermediary that transmits rotational power while being interposed between power transmission shafts of an input shaft and an output shaft but use a free-state pendulum part which is not fixed to the power transmission shafts of both sides, thereby transmitting only original rotational power within the power transmission from the power transmission shafts.SELECTED DRAWING: Figure 19

Description

[Technical Field]

[0001] The present invention relates to a universal joint. [Background technology]

[0002] In a universal joint, the power transmission shafts of the input and output shafts are bent and joined together. There is a Cardan joint consisting of one cross shaft and two joint yokes. The Cardan joint has the problem of non-uniform velocity motion, but a method of installing two Cardan joints in series to cancel out the non-uniform velocity motion has also been adopted. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent application 2022-138596 [Patent Document 2] Patent Publication No. 2018-184981 [Patent Document 1] Patent Publication No. 2009-168190 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a universal joint that can suppress non-uniform motion. [Means for solving the problem]

[0005] In order to solve the above problems, the present invention employs the following means. The joint yoke is designed without the cross axis of the Cardan joint, which is a major cause of non-uniform motion.

[0006] Claim 1 of the present invention is as follows: A pendulum receiving portion 75 is provided at each of the opposing ends of the input shaft and the output shaft, which are the power transmission shaft 51, A sliding movement space 79 consisting of a sliding wall surface portion 76 is provided in each of the pendulum portion receiving portions 75, The pendulum part 70 is provided in a freely slidable state, and swings while contacting the slide wall surface part 76 of the slide movement space 79 of the pendulum part receiving part 75 on both sides of the input shaft and the output shaft, The pendulum part 70 swings like a pendulum. The input shaft and output shaft rotate and oscillate around the intersection point of their center lines. The part of the pendulum part that is connected to the center point, which is the center of swing of the pendulum part, is the pendulum part intermediate part 72 that is the pendulum part base part of the pendulum part 70, The pendulum portion 71 is provided extending from the pendulum portion intermediate portion 72 on both sides, Both sides of the pendulum portion 71 on both sides are provided as sliding contact surfaces for power transmission,

[0007] The slide contact surfaces are on both sides different from each other on the input shaft side and the output shaft side, That is, the pendulum part 71 extends from the pendulum part intermediate part 72, which has a four-sided structure like a square pillar, to both sides, and the front and back surfaces of the pendulum part 71 form the sliding contact surface. Two of the four surfaces are opposite to each other on the input shaft side and the output shaft side, The pendulum portion receiving portions 75 provided on the power transmission shafts 51 of both the input shaft and the output shaft are also oriented such that the sliding wall surface portions 76 constituting the sliding movement spaces 79 face each other in different directions of 90 degrees, so that the pendulum portions 71 facing the respective sides can be slidably housed and received within the sliding movement spaces 79, and the rotational force of the power transmission shafts 51 is transmitted while the sliding wall surface portions 76 and the pendulum portions 71 are in contact with each other at their contact surfaces. A universal joint characterized by

[0008] This is the position where the center lines of the input shaft and output shaft intersect. The pendulum section 70 is a free, independent component that is not fixed to the power transmission shaft 51 on either the input shaft or the output shaft. The pendulum sections 72 are extended symmetrically on both sides of the pendulum section 70, and are positioned at a midpoint that is the base point of the pendulum motion. The left and right pendulum portions 72 are symmetrical. 、 The positions of the sliding surfaces on both sides of the pendulum portion 71 that slide in contact with the sliding wall surface portions 76 of the pendulum portion receiving portions 75 provided on both the power transmission shafts 51 of the input shaft and the output shaft are on both sides of the left and right pendulum portions 71 that are symmetrical and are different by 90 degrees,

[0009] Also, the pendulum part 70 is a free, independent part. When the pendulum part 70 rotates due to power transmission, the pendulum part 70 is held by its own rotational force with the intermediate position of the pendulum part 70 as the center point of rotation and pendulum movement, and is held within the ride movement space 79 of the slide wall surface part of the pendulum part receiving part 75, so that it rotates and swings together with the pendulum part receiving part 75.

[0010] As shown in FIG. 11, the process of the rotation of the pendulum part 71 during power transmission is as follows: when the left side of the power transmission shaft 51 on both sides of the input shaft and the output shaft is horizontal and the right side is extended obliquely downward to connect the power transmission. teeth , When the surface of the sliding wall portion 76 of the left pendulum receiving portion 75 is vertical, In the case where the surface of the slide wall portion 76 of the right pendulum receiving portion 75 is oriented horizontally, The left pendulum part 71 is pointing diagonally upward to the left, and the sliding surface is also vertical. The right pendulum part 71 is pointing diagonally downward to the right, and the slide surface also rotates sideways, Further rotation causes the left and right pendulum portions 71 to alternately swing up and down while rotating, thereby transmitting power.

[0011] Next, when power transmission shafts 51 of the input and output shafts, whose tips face each other at a bent angle, are not fixed but are connected by the universal joint of the present invention in a state in which the bending angle is free, a hook or a protrusion may be provided on pendulum part receiving portion 75 or on pendulum part 70 as a latch to prevent pendulum part 70 from falling off and becoming detached, in a position that does not interfere with the pendulum motion of pendulum part 70.

[0012] Claim 2 of the present invention is as follows: In claim 1, The pendulum section 71 is provided extending from the pendulum section intermediate section 72 of the pendulum section 70 to both sides, and a pendulum section slide space 32 formed of a pendulum section slide wall surface 31 is provided in the pendulum section 71, The pendulum part receiving portions 75 provided at the opposing ends of the input shaft and the output shaft, which are the power transmission shaft 51, have end portions extending beyond the power transmission shaft mounting tube portion 53 that form rod-shaped pendulum part receiving portions 35, Both sides of the rod-shaped pendulum receiving portion 35 are provided as pendulum receiving portion slide contact surfaces 36, which are contact surfaces for power transmission, The rod-shaped pendulum receiving portion 35 is inserted into the pendulum slide space 32 and is in contact with the pendulum slide wall surface 31 to transmit rotational power. A universal joint characterized by

[0013] This is because the pendulum section slide space 32 is provided in the pendulum section 70 in the free state, By inserting the rod-shaped pendulum receiving portion 35, which is a rod-shaped portion of the pendulum receiving portion 75 of the claim, into the pendulum sliding space 32 from both sides, This serves as a means for preventing the pendulum part 71 from falling off and for guiding it to the center position of rotation.

[0014] Claim 3 of the present invention is as follows: In claims 1 and 2, The input shaft and the output shaft are connected in a flexibly and rotatably manner. The spherical cup combined universal joint 40 has a hollow interior and is made up of two spherical cups, one large and one small, like wine glasses, which are fitted together to form a spherical shape and are rotatable. The universal joint 10 of claim 1 or claim 2 is fixedly connected to the shaft rods of the input shaft and the output shaft in the spherical cup space, The distance between the tips of the input shaft and the output shaft and the position where they intersect on the center line can always be maintained within the cup. A universal joint characterized by

[0015] This is a spherical universal joint that connects shafts that do not transmit rotational power freely. By attaching it to the universal joint of claims 1 and 2, which does not have a joint mechanism for maintaining the distance between the input shaft and the output shaft, This is to prevent the center position, which is the base point of the pendulum movement, from changing even if the bending angle between the input shaft and the output shaft changes, without changing the distance between them.

[0016] In addition, the spherical cup combined type universal joint 40, which is hollow inside and spherical, A power transmission shaft mounting cylinder 53 is provided on one side of a hollow sphere, and the tapered end of the sphere opposite the power transmission shaft mounting cylinder 53 is an opening at the tip end, forming the sphere into a wine glass-like cup, and two of the cups form a set. The two cups in a set are a large cup and a small cup. The two cups are rotatably mounted on the power transmission shaft mounting cylinders 53 at the ends of the input shaft and the output shaft, respectively;

[0017] The two attached cup portions are also rotatably fitted with the small cup portion inside the large cup, and then a retaining ring 46 is attached to the tip of the large cup, The inner surface of the large cup portion 44 and the surface of the small cup portion 45 inside the large cup portion 44 are fitted together to form a spherical cup, and the two cup portions are bendable by sliding and rotating on the spherical surface between them. The tips of the input shaft and the output shaft are exposed to the spherical cup space 43 inside the two spherical cup portions, The universal joint of claim 1 or claim 2 can be fixed to the exposed tips of the input shaft and output shaft. [Effects of the Invention]

[0018] Conventional Cardan joints, which are joint yokes used to bend and connect power transmission shafts, The cross shaft is connected to a joint yoke, which is a bifurcated end tool fixed to each of the power transmission shafts of the input and output shafts, and the pins of the cross shaft tilt and swing toward each power transmission shaft to transmit rotational power. However, this tilting movement can cause excessive swinging during high-speed rotation, which can cause the power transmission shaft to break, etc.

[0019] The advantages of the universal joint of the present invention include: The universal joint has a simple structure that does not require the cross axis of a Cardan joint, which is the main cause of non-uniform motion. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a plan view of the pendulum part 70 of claim 1. [Figure 2] FIG. 2 is a front view of FIG. [Figure 3] FIG. 3 is a side view of FIG. 2. [Figure 4] FIG. 7 is a plan view of a pendulum portion holder 75 provided at the tip of the power transmission shaft 51 of both the input shaft and the output shaft of claim 1. [Figure 5] FIG. 5 is a front view of FIG. [Figure 6] FIG. 6 is a side view of FIG. 5. [Figure 7] FIG. 7 is a bottom view of FIG. [Figure 8] 1 to 3 and the pendulum part receiving device 75 of FIGS. 4 to 7. [Figure 9] 1 is a perspective view of the pendulum part 70 of claim 1, which is made up of a square pillar as a whole. [Figure 10] 9 is a side view, and FIG. 9 shows an embodiment consisting of a pendulum part 70 and a pendulum part holder 75 which are square pillars in overall shape. [Figure 11] 1 is a plan view of the pendulum part 70 of claim 2. [Figure 12] FIG. 12 is a front view of FIG. [Figure 13] 12 is a side view seen from the right side of FIG. 11. [Figure 14] FIG. 1 is a front view showing the rod-shaped pendulum part receiving portion 35 of the pendulum part receiving portion 75 provided at the tip of the power transmission shaft 51 of both the input shaft and the output shaft of claim 2. [Figure 15] FIG. 15 is a side view of FIG. [Figure 16] 11 to 13 and the pendulum part receiving parts 75 on both sides thereof, as shown in FIGS. 14 and 15. [Figure 17] 1 is a front view of a cup-combined universal joint of claim 3 for accommodating the universal joints of claims 1 and 2 after combination is complete. [Figure 18] FIG. 10 is a front view of the cup combination type universal joint before it is combined, and is a partial cross-sectional view showing how it is moved in the direction of the arrow and fitted together to be combined. [Figure 19] 10 is housed in the spherical cup space 43 according to claim 1. FIG. 10 is a partially sectional front view of the cup combined universal joint after the combination is completed. DETAILED DESCRIPTION OF THE INVENTION

[0021] As a universal joint that suppresses non-uniform motion, In claim 1 of the present invention, A universal joint (10) comprising an input shaft and a pendulum part (70) that swings while contacting the slide wall surface within the slide space (79) of the pendulum part receiving part (75) on both sides of the output shaft,

[0022] The position where the center lines of the input shaft and output shaft intersect is the base point of the swing center, and the pendulum part 70 stays in its optimal position by its own rotational force, rotating to transmit power. Furthermore, the pendulum part 70 has a center of rotation of the pendulum part 70, which is the base point, at the pendulum part intermediate part 72, which is the base part of the pendulum part. The pendulum parts 71 extend from the middle part 72 to both sides. The sliding contact surfaces of the contact surfaces on both sides of the pendulum portion 71 extended to the left and right of the pendulum portion 70 for transmitting power in contact with the sliding wall surface of the pendulum portion receiving portion 75 are as follows: The slide contact surfaces are on both sides different from each other on the input shaft side and the output shaft side,

[0023] That is, the pendulum part 71 extends from the pendulum part intermediate part 72, which has a four-sided structure like a square pillar, to both sides, and both sides of the front and back of the pendulum part 71 constitute the sliding contact surface. Two of the four surfaces are orthogonal to each other, and are opposite surfaces on different sides of the input shaft side and the output shaft side, The pendulum portion receiving portions 75 provided on the power transmission shafts 51 of both the input shaft and the output shaft are also arranged such that the orientations of the slide wall surfaces constituting the slide space are opposite to each other in different directions of 90 degrees, and the pendulum portions 71 facing the respective sides are slidably housed and received within the slide spaces, thereby enabling the transmission of rotational power.

[0024] In claim 2 of the present invention, The slide space provided in the pendulum receiving portion 75 of claim 1 is The pendulum section 70 is provided on both sides of the pendulum section 71, The sliding contact surface provided on the pendulum part 70 of claim 1 The tip end of the power transmission shaft mounting tube 53 of the pendulum part receiving part 75 is formed as a rod-shaped pendulum part receiving part 35, and both surfaces of the rod-shaped pendulum part receiving part 35 are sliding contact surfaces. This is the opposite of claim 1, There is no need for pins or the like to prevent falling off.

[0025] In claim 3 of the present invention, In the case of claims 1 and 2, the input shaft and the output shaft are connected via a cross shaft, and are not connected by a Cardan joint with a fixed distance, By placing a free pendulum between the input shaft and output shaft, The oscillation is due to the transmission of rotational power only, without being affected by the bending angle of the input shaft and output shaft. Since the input shaft, output shaft, and pendulum section are not fixedly connected, the distance must be adjusted each time the angle of refraction between the input shaft and output shaft changes. As a countermeasure The input shaft and the output shaft are connected in a flexibly and rotatably manner by a spherical cup combined universal joint 40, which is a hollow spherical cup made up of two cups, one large and one small, like wine glasses. The universal joint of claim 1 or claim 2 is connected and fixed to the shafts of the input shaft and the output shaft in the cup, The distance between the tips of the input shaft and the output shaft and the position where their center lines intersect can always be maintained within the cup. [Example]

[0026] Figures 1 to 10 show the universal joint of claim 1. a pendulum receiving portion 75 provided at the tip of each of the input shaft and the output shaft, which are the power transmission shaft 51; The pendulum part 70 is inserted between the pendulum part receiving parts 75 provided on the input shaft and the output shaft in a free state without being fixed to the pendulum part receiving parts 75, and swings freely to play the role of a cross shaft for transmitting rotational power.

[0027] 1 to 3 show the pendulum section 70, The tips of the pendulums on both ends of the pendulum part 70 extending from the middle part 72 of the pendulum part 72 in the shape of a rectangular pillar are each shaped like one side of a circle drawn by the pendulum motion. The long sides of the wide pendulum portions 71 at the two widened ends are oriented in different directions by 90 degrees. As shown in FIG. 1, the pendulum has a shape in which a vertically long pendulum portion 71 on the front side and a horizontally long pendulum portion 71 on the back side face each other with a pendulum middle portion 72 sandwiched between them.

[0028] In the plan view of FIG. 1, the vertically long rectangle in the center is expanded vertically around the tip of the pendulum portion 71 on the front side of the pendulum part 70, The horizontally long rectangle is widened horizontally at the pendulum part 71 at the back, and in plan view, the long sides of the periphery that make up the wide surfaces of the pendulum parts 71 on both sides, front and back, intersect at right angles like a cross. This is because the pendulum middle part 72 is made of a square prism and the two opposing sides of the square prism are widened in both directions, but at both ends, the width is widened from both sides of the square prism, which are different from each other. The thickness is also increased from the middle portion while maintaining the same thickness.

[0029] The protrusions on both sides of the tip of the widened pendulum section 71 act as stoppers that limit the angle of inclination of the swing of the pendulum section 70 and as anti-detachment protrusions 73 that prevent the pendulum section 70 from falling out of the pendulum section receiving section 75.

[0030] Figure 2 is a front view of Figure 1, and Figure 3 is a side view of Figure 1. In Figures 2 and 3, the orientation of the semicircular pendulum sections 71 at both ends of the pendulum section 70, shown above and below, is different by 90 degrees, and the central section is a pendulum intermediate section 72 formed in the shape of a regular square prism.

[0031] 4 to 7 show a pendulum part receiving part 75, which accommodates and receives the pendulum part 70 of claim 1 shown in FIGS. 1 to 3 in a slide movement space 79. Figure 4 is a plan view, and the vertically long section in the center is a sliding movement space 79 that stores the pendulum section 70 so that it can slide freely, and the section where the three squares on both sides are connected vertically is a sliding wall surface component section 77 that makes up the sliding wall surface section 76, and the square in the middle of the three is a sliding wall surface component tip section 78 that narrows towards the tip.

[0032] Figure 5 is a front view. The upper side of the left and right sliding wall components 77 that make up the pendulum unit receiving portion 75 is the sliding wall component tip portion 78, which continues to the power transmission shaft mounting tube portion 53 and the power transmission shaft 51 at the bottom.

[0033] FIG. 6 is a side view of FIG. 5, showing that the tip 78 of the sliding wall surface component on the upper side of the sliding wall surface component 77 is narrow, and the power transmission shaft mounting tube 53 and the power transmission shaft 51 are shown on the lowest side. 7 is a bottom view of FIG. 6, and the shaded circular area inside the central power transmission shaft mounting cylinder 53 indicates the cross section of the driving power transmission shaft 51.

[0034] FIG. 8 is a side view of an embodiment of the pendulum part 70 of FIGS. 1 to 3 and the pendulum part receiving part 75 of FIGS. 4 to 7. In the sliding movement space 79 inside the sliding wall surface portion 76 of the sliding wall surface forming portion 77 of the left and right pendulum part receiving portion 75, The pendulum section 71 on both tip ends of the pendulum section 70, which has a semicircularly widened tip end, The pendulum part receiving portion 75 is fitted between the slide wall surface portions 76, and the wide surfaces of the pendulum part receiving portion 75 are in contact with each other as slide surfaces, and the pendulum part moves. The pendulum portion 71 has anti-detachment projections 73 at both ends of its wide side. The portion of the pendulum portion 70 that contacts the tip end 78 of the sliding wall surface component is the pendulum portion intermediate portion 72 .

[0035] FIG. 9 is a perspective view of a square-prism-type pendulum section 70 according to claim 1, in which the entire pendulum section 70 is made up of a square prism, with circular anti-detachment recesses 74 provided on each of the four opposing faces at the midpoint of the center of the long sides of the square prism, and hollow sections 80 provided at both ends.

[0036] FIG. 10 is a side view of an embodiment of the universal joint of claim 1, which is similar to the pendulum part 70 of FIG. 9 and the pendulum part receiving part 75 of FIGS. 4 to 7, and in which a separation prevention protrusion 73 is provided on the tip end 78 of the slide wall surface forming part of the pendulum part receiving part 75, and is fitted into a separation prevention recess 74,

[0037] The measure to prevent this separation is that when the pendulum part 70 rotates by power transmission, the midpoint of the two opposing power transmission shafts 51 is the center point of rotation and pendulum movement, and the pendulum part 70 rotates around the pendulum part middle part 72, and is held in place by the rotational force of the pendulum part 70 itself. This is because there is a possibility that the pendulum part 70 may fall out of the slide movement space 79 and separate from the pendulum part receiving part 75 when the rotation of the power transmission is slow or stopped. However, the diameter of the separation prevention protrusion 73 is set to one-third or less of the diameter of the circle of the separation prevention recess 74 so that the pressure of the rotational power from the power transmission shaft 51 is not applied to the separation prevention protrusion 73. The rotational power is transmitted only by contact between the surface of the pendulum portion 71 of the pendulum portion 70 and the slide wall surface portion 76 of the pendulum portion receiving portion 75. In addition, hollow portions 80 are provided at both ends of the pendulum portion 71 to reduce the weight at both ends and ensure smoother rotation.

[0038] 11 to 16 show a universal joint according to claim 2, which is the opposite of claim 1, in that a pendulum part slide space 32 is provided in the pendulum part 70. The pendulum receiving portion 75 is formed into a rod-shaped pendulum receiving portion 35, and a rod-shaped pendulum receiving portion slide contact surface 36 is provided on the rod-shaped pendulum receiving portion 35, This prevents the pendulum part receiving portion 75 and the pendulum part 70 from separating and falling off. 11 to 13 show the pendulum part 70 of claim 2, The pendulum portion 71 is fanned out from the middle of the pendulum portion 70 to both sides, but the direction of the fanning is 90 degrees different on the left and right. The inner portion indicated by the dotted line is a pendulum portion slide space 32 consisting of a pendulum portion slide wall surface 31 that houses a rod-shaped pendulum portion receiving portion 35.

[0039] Figure 11 is a plan view. The fan-shaped part on the right and the rectangular part on the left are the pendulum parts 71 that extend to the left and right. The portion indicated by the broken line is a pendulum part slide space 32 consisting of a pendulum part slide wall surface 31. FIG. 12 is a front view of FIG. 11, and since the fan-shaped, extended pendulum portion 71 is spread out in a different direction by 90 degrees, the left and right sides of FIGS. 11 and 12 appear reversed. Figure 13 is a side view of Figure 11 seen from the right side, and it looks like the pendulum part 71 on the front side and the pendulum part 71 on the back side intersect at 90 degrees. The pendulum section slide space 32 of the pendulum section 71 on the near side can be seen, and the central square section shows the pendulum section intermediate section 72 at the innermost part.

[0040] 14 and 15 show a rod-shaped pendulum part holder 75 of claim 2, The triangular pyramid-shaped portion at the top of Figure 14 is the rod-shaped pendulum receiving portion slide contact surface 36 of the rod-shaped pendulum receiving portion 35, and below that is the power transmission shaft mounting cylinder portion 53 and the power transmission shaft 51. FIG. 15 is a side view of FIG. 14, and shows that the thickness of the rod-shaped pendulum receiving portion 35 at the top is It is shown that the thickness is such that the pendulum portion can be accommodated in the slide space 32. FIG. 16 is a side view of the pendulum unit 70 shown in FIGS. 11 to 13 and the pendulum unit receiving portions 35 shown in FIGS. 14 and 15 on both sides. This shows a state in which the rotational power of the rod-shaped pendulum section retainer 75 fixed to the power transmission shaft 51 rotates the pendulum section 70 while the rod-shaped pendulum section retainer slide contact surface 36 of the rod-shaped pendulum section retainer part 35 is in contact with the pendulum section slide wall surface 31 within the pendulum section slide space 32, causing the other opposing power transmission shaft 51 to rotate and transmitting the rotational power.

[0041] FIG. 17 is a front view of the cup-combined universal joint of claim 3 for accommodating the universal joints of claims 1 and 2 after the combination is completed; a large-sized cup portion 44 extending from the power transmission shaft 51 on the left end side to the power transmission shaft mounting cylinder portion 53; The ball-and-cup combined universal joint 40 is made up of a small cup portion 45 and a retaining ring 46, which are connected from the power transmission shaft 51 on the right end side to the power transmission shaft mounting cylindrical portion 53, Inside is a spherical cup space 43.

[0042] Figure 18 is a front view of the cup-combined universal joint before it is combined, and is a partial cross-sectional view showing how it is moved in the direction of the arrow and fitted together. The small cup portion 45 is inserted into the large cup portion 44 on the left side in the direction of the arrow, and then the retaining ring 46 is placed over the tip periphery 47 of the large cup in the direction of the arrow to secure it in place. The large cup portion 44 and the small cup portion 45 are rotatably combined, The large cup portion 44 and the small cup portion 45 are also rotatably connected to the power transmission shaft 51 connected thereto by the power transmission shaft mounting cylindrical portion 53, respectively.

[0043] FIG. 19 is a partial cross-sectional front view of the ball-cup combined universal joint 40 after the combination is completed. This is an embodiment in which the universal joint 10 of claim 1 shown in FIG. 10 is housed in the ball-cup space 43. The universal joint 10 is connected to the left and right power transmission shafts 51 in the spherical cup space 43, The left and right power transmission shafts 51, which are the input shaft and the output shaft, are opposed to each other at a bending angle of 30 degrees, The small cup portion 45 on the right side is also rotated 30 degrees within the large cup portion 44. The power transmission shaft 51 is rotatably mounted within the power transmission shaft mounting cylinder 53, so that the influence of the rotational power of the power transmission shaft 51 is small. [Industrial Applicability]

[0044] By using a pendulum universal joint that does not require the use of a cross shaft in a Cardan joint, which is the main cause of non-uniform motion, stable transmission of rotational power is possible, contributing to industrial development. [Explanation of symbols]

[0045] 10 Universal joint 31 Pendulum part sliding wall 32 Pendulum slide space 35 Rod-shaped pendulum retaining part 36 Rod-shaped pendulum part receiving part slide contact surface 40 Ball and cup combined universal joint 43 Inside the ball cup space 44 Large cup 45 Small cup 46 Retaining ring 47 Large cup tip periphery 51 Power transmission shaft 53 Power transmission shaft mounting cylinder 70 Pendulum Section 71 Pendulum part 72 Pendulum part middle part 72 75 Pendulum Receiving Part 76 Slide wall section 76 79 Slide movement space 79

Claims

1. A pendulum receiving portion is provided at each of the opposing ends of the input shaft and output shaft, which are the power transmission shafts. A slide space having a slide wall surface is provided in each of the pendulum receiving portions, The pendulum parts are provided in a freely slidable state so as to swing while contacting the slide wall surfaces in the slide spaces of the pendulum part receiving parts on both sides of the input shaft and the output shaft, The pendulum part that swings like a pendulum is The rotational axis of the input shaft and the output shaft intersects at the center point. The part of the pendulum part that is connected to the central point, which is the center of swing of the pendulum part, is a pendulum part intermediate part that is a pendulum part base part of the pendulum part, The pendulum portion is provided so as to extend from the middle portion of the pendulum portion to both sides, Both sides of the pendulum portions on both sides are provided as sliding contact surfaces for power transmission, The slide contact surfaces are on both sides different from each other on the input shaft side and the output shaft side, That is, the pendulum portion extends from the middle portion of the pendulum portion, which has a four-sided structure like a square prism, to both sides, and the front and back surfaces of the pendulum portion constitute the sliding contact surface. Two of the four surfaces are opposite to each other on the input shaft side and the output shaft side, The pendulum part receiving devices provided on both the input shaft and the output shaft are also arranged such that the sliding wall surface portions constituting the sliding movement space are oriented in different directions by 90 degrees to face each other, so that the pendulum portions facing the respective sides can be slidably housed and received within the sliding movement space, and the rotational force of the power transmission shaft is transmitted while the sliding wall surface portions and the pendulum portions are in contact with each other at their contact surfaces. A universal joint characterized by

2. In claim 1, a pendulum section slide space formed of a pendulum section slide wall surface is provided in the pendulum section extending from the pendulum section middle portion to both sides, The pendulum part receiving portions provided at the opposing ends of the input shaft and the output shaft, which are power transmission shafts, have end sides extending from the power transmission shaft mounting cylindrical portion to form rod-shaped pendulum part receiving portions, Both sides of the rod-shaped pendulum receiving portion are provided as pendulum receiving portion slide contact surfaces, which are contact surfaces for power transmission, The rod-shaped pendulum part receiving part is inserted into the pendulum part slide space, and the pendulum part receiving part slide contact surface rotates while contacting the pendulum part slide wall surface, thereby transmitting rotational power. A universal joint characterized by

3. In claim 1 and claim 2, The input shaft and the output shaft are connected in a flexibly and rotatably manner. The spherical cup space inside the spherical cup combined universal joint is made by fitting two hollow spherical cups, one large and one small, like wine glasses, face to face to form a sphere and rotatably combined. The universal joint of claim 1 or claim 2 is fixedly connected to the shaft rods of the input shaft and the output shaft in the spherical cup space, The distance between the tips of the input shaft and the output shaft and the position where their center lines intersect are always maintained within the cup, allowing rotational power to be transmitted by the universal joint. A universal joint characterized by

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