JP2023114521A - Cross shaft type universal joint improved in power transmission force - Google Patents

Abstract

To improve power transmission force by reducing obstacles caused by a non-uniform movement of a cross shaft.SOLUTION: In the present invention, from two shaft rods of a cross shaft having a shape in which the two shaft rods intersect crosswise, a pendulum part of a fan-shaped structure is projected toward a power transmission shaft side on a non-joint side, and the pendulum part is slidably sandwiched between fork portions of a joint yoke of a power transmission shaft, so that the pendulum part becomes a new fulcrum for guiding a trajectory of a pendulum movement and transmitting power, and further, center lines of the shaft rods intersecting crosswise are shifted and crossed so that the power transmission fulcrums become closer to the power transmission shaft of the other side, thereby increasing the transmission power of the rotational power of a cross shaft type universal joint.SELECTED DRAWING: Figure 17

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure capable of smoothly and powerfully transmitting rotational power in a cross shaft type universal joint of a universal joint.

Conventionally, universal joints can transmit rotational power even if they are bent at an angle instead of straight at the intersection of the input and output shafts of the power transmission shaft. The so-called cruciform universal joint also has a problem of non-uniform motion, which may cause problems during high-speed rotation.

JP 2002-227872 Japanese Patent Laid-Open No. 10-292824

SUMMARY OF THE INVENTION An object of the present invention is to improve the power transmission force of a cross shaft type universal joint by modifying and improving the shape of the cross shaft and the joint portion.

In order to solve the above problems, the present invention employs the following means.
First, the shaft rod of a cross shaft type universal joint, in which the shaft rods cross each other, is aligned with the center line of each shaft at the yoke at the tip of the power transmission shaft of either the input shaft or the output shaft. are rotatably jointed at right angles, and when the cross shaft type universal joint rotates, the two shafts at the joint part swing their heads about the respective shafts in a hinged manner. The swinging motion is performed by swinging twice per rotation of the power transmission shaft. The angle of refraction is the angle at which the input and output axes of the transmission shaft intersect.

In the present invention, the pendulum portion for guiding the motion of swinging the head, etc., protrudes from one side of the cross shaft where two shafts intersect each other in the direction of the power transmission shaft on the non-joint side. A guide portion acting as a rail for guiding and following the pendulum motion trajectory of the pendulum portion from both lateral sides is provided on the input shaft side and the output shaft side of both the power transmission shafts on the non-joint side. and the pendulum part during pendulum motion and the guide part of the contact point where the input shaft and the output shaft of the power transmission shaft are in contact with each other as a new power transmission fulcrum for rotational power transmission to provide;
Furthermore, the two power transmission shafts of the input shaft and the output shaft are rotatably jointed at the center where the center lines of the two straight shafts of the cross shaft type universal joint intersect at right angles. , rather than intersecting at one point, the center line is moved to the side of the power transmission shaft of the mating side, and the crossing is shifted to increase the power transmission force.

According to claim 1 of the present invention, there is provided a cruciform universal joint consisting of two shaft rods that integrate straight lines into a cross shape on a plane, wherein the shaft rod of the cruciform universal joint is a power for rotation. It is a configuration in which the input shaft and the output shaft, which are transmission shafts, are rotatably jointed by joint yokes, which are also called bifurcated fittings, on either side, and the shafts are crossed at right angles in the shape of a cross on the plane. From both ends of the outer side straddling the central portion of the axial rod or the joint portion on both sides of the central portion and the central portion in the opposite vertical direction from the plane, or the joint A pendulum part having a shape forming one side of a circle, such as a fan shape or a semicircle, which is shaped to trace the trajectory of the tip of the pendulum movement around the tip is protruded from both ends of the outside of the part, and the cross axis type free The input shaft and the output shaft of the power transmission shaft are fixed integrally with a joint, and the input shaft and the output shaft of the power transmission shaft are jointed to the shaft rod projecting the pendulum portion toward the power transmission shaft on the other side. and the pendulum portion of the axial rod jointed by the other side is sandwiched between the two forks of the joint yoke on the self side, and the sandwiched pendulum portion extends between the two forks of the joint yoke. The pendulum portion is also pendulum-moved by swinging motion of rotating and changing the angle at the tip of the joint yoke while the cross shaft type universal joint rotates to transmit rotational power. In some cases, the joint yoke portion of the portion that slides the pendulum portion sandwiched between the forks is used as a guide portion that guides the orbit of the pendulum portion without swaying, and a new rotational power of the power transmission shaft is provided. A cruciform universal joint with improved power transmission, characterized in that it is provided as a fulcrum for transmission of rotational power.

In this case, the point of contact between the cross shaft type universal joint and the power transmission shaft is changed from the point of contact at the joints on both sides of the central portion of the conventional axial rod to the center line of the pendulum portion and the power transmission shaft. The addition of contact points on the inside between the guides through which the power passes increases stability and power transmission.

In addition, the pendulum part integral with the cross shaft type universal joint slides between the two forks of the joint yoke which is divided into two forks at the tip of the power transmission shaft, while being sandwiched between the two forks of the joint yoke. The pendulum motion is such that the power transmission shaft swings twice in one rotation. It is desirable to provide a roll bearing at the guide portion of the track and the fulcrum for transmitting rotational power.

In addition, cushion-like stoppers such as springs are provided at the turning points of the pendulum motion on both ends of the widened side of the pendulum portion so as to prevent pendulum motion during high-speed rotation of the cross shaft type universal joint. It may be designed to prevent recoil from excessive movement.

Claim 2 of the present invention relates to a cruciform universal joint comprising two straight shafts integrally fixed in the shape of a cross. The center lines of the shaft rods at the positions where the shaft rods intersect each other at right angles are not intersected at the same point but are intersected at an arbitrary interval to improve the power transmission force. Cross shaft type universal joint

This is the intersection of the center point of the cross where the center lines of the two straight shafts forming the cross of the cross shaft type universal joint intersect. Each of the two power transmission shafts, the input shaft on the power source side and the output shaft on the power transmission destination side, is connected to the other side of the two shafts that are staggered and intersected as described above. By rotatably connecting with the shaft rod on the side of the transmission shaft, the two power transmission shafts are configured so that they bite slightly toward the mating side, and the side where the bending angle at which the two power transmission shafts intersect narrows is downward. If the two power transmission shafts intersect at a position below the center point of the cross shaft, then the two power transmission shafts are jointed to the shaft rod. This will increase the rotational power transmission force of

In addition, in the cross shaft by improving the cross shaft type universal joint of claim 2, the pendulum part and the guide of claim 1 are used for joints at a slight crossing angle between the power transmission shafts and for operating environments such as low speed rotation. It may be arranged so that it can be provided at a low cost without providing the part.

Claim 3 of the present invention is the cruciform universal joint according to claim 2, wherein two straight shafts extending in four directions on a plane are integrated in a cross shape in which two straight shafts are crossed at right angles. Both sides of each of the four axial rod portions extending in four directions from the center of the cross shaft type universal joint, i.e., adjacent axial rods on both lateral sides extending in four directions The shape of the joint portion between the input shaft and the output shaft of the power transmission shaft on the facing side, or the shape of the joint portion and the adjacent portion, is a flat flat surface perpendicular to the plane, and the flat surface is the input The shaft and the output shaft are slidable in the joint portion, and the cross shaft type universal joint is slidable from the joint portion in the vertical direction from the plane and in the longitudinal direction of the shaft rod. Cross shaft type universal joint with improved power transmission force characterized by

This is the counterpart of the power transmission shafts that are rotatably connected to each other without intersecting the center lines of the two straight shafts forming the cross of the cross shaft type universal joint at one point. By shifting and intersecting the power transmission shaft, when the cross shafts spread in four directions rotate and change the angle from the axis of the power transmission shaft, the original center point of the cross shaft rotates and angles. Since it becomes the center point of the change, if the output shafts were to intersect at a bending angle of 30 degrees from the axis of the input shaft, there would be a little separation around the original center point of the rotating cross shaft, that is, the above-mentioned shift. If the diameter of the power transmission shaft is 18 mm, the center line should be , When crossed by shifting 2mm from the center point of the original cross axis by 4mm in total, it is possible to slide about 1mm each in both longitudinal and vertical directions. Similarly, a slide space for movement is provided in the joint portion and the shaft.

In addition, the joints between the four axial rods of the cross shaft type universal joint and the power transmission shaft have a two-layer bearing structure of a cylindrical outer bearing and an inner cylindrical bearing. An outer bearing portion composed of a bearing is rotatably provided, an inner bearing portion is provided on the inner side where the roll bearing contacts, a ball bearing is provided on the flat surface side inside the inner bearing portion, and the cross shaft In addition to making the universal joint slidably movable, a space for movement is provided on both sides of the inner side of the inner bearing portion on the vertical surface side, and the cross shaft type universal joint is vertically slidable on the inner side of the inner bearing portion. It is provided as a cylindrical slide cylinder that enables the slide movement of the.

According to claim 1 of the present invention, a pendulum portion having a fan-like structure or the like is protruded from a cross shaft type universal joint toward the power transmission shaft on both sides, and the pendulum portion is slidably moved by the joint yoke of the power transmission shaft. It is freely sandwiched so that it becomes a new fulcrum for guiding the trajectory of the pendulum motion and for power transmission. By shifting the joints of the shaft rods closer to the power transmission shafts on the other side, the center lines of the power transmission shafts are aligned at the tips. The power transmission force of the cross shaft type universal joint has been improved with a structure that intersects and overlaps.

In the plan view, one of the two pendulum parts provided in the present invention is shown in the middle of the cross axis, oblong with the thickness of the horizontal flat plate exposed. 1 is a front view of FIG. 1, showing that the pendulum part of the present invention is provided above and below the cross shaft extending horizontally in the center. 1 is a side view of FIG. 1, showing that pendulum parts of the present invention having the same shape as in FIG. 2 are provided above and below. 1 is a plan view of a joint yoke, showing a crotch portion of the joint yoke provided with a rotational power transmission fulcrum that also serves as a guide portion of the present invention in the center. FIG. 4 is a front view of FIG. 4, which shows, on the left and right sides of the upper portion, the joint portion that allows the cross shaft to rotate freely, and the crotch portion of the joint yoke provided with the rotational power transmission fulcrum in the center. 4 is a side view of FIG. 4, showing a joint portion provided with an opening in which a bearing through which the cross shaft passes is provided in the upper portion, and a mounting portion for the power transmission shaft in the lower portion. 4 is a bottom view of FIG. 4, showing a cylindrical opening of the mounting portion for inserting the rotary power transmission shaft in the center. 1] is a front view of an embodiment in which a cross shaft type universal joint provided with a pendulum part of the present invention and a joint yoke are connected. [FIG. 8 is a side view seen from the right side of FIG. 8, showing part of the power transmission shaft at the upper center and lower side. is a plan view of the cross shaft type universal joint of claim 2. FIG. 10 is a front view of FIG. 10, showing that the center lines of two axial rods crossing each other on a plane are vertically shifted and intersected. FIG. 10 is a perspective view of FIG. 10 showing that the cross-shaped stem is a square square stem with a cylindrical tip. 11 is a front view of cross shafts in which the center lines of the shaft rods are shifted and intersected as in FIG. 11, but shows a state inside a ring-shaped ring provided on the periphery. 13 is a plan view of FIG. 13, showing a configuration of a ring-shaped ring and axial rods arranged in a cross shape. FIG. 14 is a perspective view of FIG. 14, showing that the cross-shaped shaft is composed of a quadrangular square-shaped shaft. shows that the pendulum part of claim 1 is provided in the perspective view of FIG. . 16 is a front view, and is an image diagram of an embodiment in which a yoke is connected to the cross shaft type universal joint provided with the ring-shaped ring and the pendulum portion 3 of FIG. 16. FIG. shows a state in which the bearing of claim 3, which has a structure corresponding to the cross shaft of claim 2, is mounted on the cross shaft. 19 is a perspective view of a bearing structure representing a single unit of the bearing of FIG. 18 and allowing rotatable and vertical and longitudinal axial movement of the shaft; FIG. 18 is a front view of the single bearing of FIG. 18, showing that there are movable spaces above and below the central square bar-shaped shaft. 1 is a perspective view of an embodiment in which the pendulum part of claim 1 is not provided and the cross shaft type universal joint and joint yoke of claim 2 and claim 3 are connected. FIG.

The cross-axis universal joint of the universal joint is called a cardan joint, and it enables the transmission of rotational power with a simple structure. In order to enhance the transmission of power and make it easier to use, in claim 1, from the plane above the cross shaft type universal joint consisting of a shaft rod integrated in a cross shape extending in four directions on the plane A pendulum portion 3 protruding in the reverse vertical direction is provided to form a three-dimensional structure, and the pendulum portion 3 is provided at the deepest part of the fore portion of the yoke 6 and serves as a rotational force transmission fulcrum 4 that also serves as a guide portion. By sliding and passing through the shaft rod 2, it is added as a new fulcrum together with the fulcrum of the rotational force transmission carried by the two joints of each of the shafts 2, to increase the transmission of rotational power;

In claim 2,
The positions where the shaft rods of the cross shaft type universal joint intersect each other at right angles are arranged to intersect at an appropriate interval according to the intersection angle that matches the bending angle at which the power transmission shafts intersect. So, the power transmission shafts are jointed with the shaft rod on the side of the other side, and from the center point of the cross shaft type universal joint, which is the vertex of the bent corner, each other slips inside the power transmission shaft on the other side. to increase the transmission of rotational power by

In claim 3,
A cross shaft type universal joint produced by intersecting the positions where the shafts of claim 2 perpendicularly intersect with each other at an arbitrary interval and further rotatably jointing with a power transmission shaft whose position is fixed We are trying to eliminate the gap with the center point of its own rotation.

1 to 3 show a cross shaft 1 provided with a pendulum part 3. In the plan view of FIG. A shaft 2 arranged to extend in a cross shape and a pendulum part 3a of claim 1 of the present invention are arranged horizontally in the center part, and the thickness of the periphery of the head tip side where the pendulum part 3a performs the pendulum movement The thickness of the board is indicated,

The shape of the pendulum part 3a is a thick plate projecting from the cross shaft central part shaft fixing metal fitting 10, and the periphery of the tip forms one side of a circle such as a sector. Extending in the direction of both ends in the longitudinal direction, the thickness is required to be about the thickness of the shaft 2 or a thickness that can withstand the rotating power that twists the power transmission shaft. It has a thick plate shape with a thickness slightly less than the thickness of .

In the side view of FIG. 2, the shaft 2 is shown in the center and both lateral sides of the central cross shaft central portion shaft fixing bracket 10, and the pendulum portion 3 is shown above and below, but the upper portion The pendulum part 3a on the side forms one side of the circumference that traces the trajectory of the tip of the pendulum movement as if the head part is spread to both sides, and the pendulum part 3b on the lower side has the same shape. However, the head portion of the pendulum portion 3b directed downward spreads in the front-rear direction opposite to that of the pendulum portion 3a on the upper side, and in this figure, the thick portion of the thick plate is shown instead of the wide surface. there is

In the front view of FIG. 3, it is the opposite of FIG. It shows that it forms one side, and the two axes are integrated in a shape that extends in four directions in a cross shape on a plane. Each of the provided pendulum portions 3 is protruded from the cross shaft center portion shaft fixing metal fitting 10 along the longitudinal direction of each of the two shafts 2, and the peripheral end is extended to one side of the circumference. It shows that it is spread over

FIGS. 4 to 7 show a yoke 6 rotatably jointed to the shaft 2 of the cross shaft 1 provided with the pendulum part 3 of claim 1. In the plan view of FIG. The circular shape in the center is the power transmission shaft mounting cylindrical portion 11, and further in the center is a guide portion that opens at the deepest part of the fore portion of the yoke 6 divided into two. In the rotational force transmission fulcrum 4, from the plane of the cross shaft 1 arranged so as to extend the above two shafts in a cross shape, each axis of the cross shaft 1 A roll bearing 54 for sandwiching the vertical fan-shaped plane portion which is the wide surface of the pendulum portion 3 provided so as to protrude vertically along the longitudinal side of the rod 2 and for guiding the pendulum motion by smooth sliding. , indicating that

In the front view of FIG. 5, a joint part 9 is provided at both ends of the upper part of the yoke 6 divided into two parts, and a roll bearing 54 is provided at the crotch part of the central part of the yoke 6. It shows that the fulcrum 4 is provided with the power transmission shaft mounting cylinder part 11 at the lower part of the yoke 6,
In the side view of FIG. 6, the joint portion 9 having an opening 24 for inserting the shaft in its upper portion is attached to the lower portion of the yoke base portion 12 in the central portion of the yoke 6 fixing the joint portion 9. It shows that the cylinder part 11 is provided,
The bottom view of FIG. 7 shows the yoke base portion 12, the joint portion 9, and the power transmission shaft insertion opening 13 of the power transmission shaft mounting cylindrical portion 11 in the center.

8 and 9 show an embodiment in which the shaft rod 2 of the cross shaft 1 provided with the pendulum part 3 of claim 1 and the yoke 6 are rotatably jointed. In the front view of FIG. is transmitted to the output shaft 8 on the left side. The output shaft side yoke 6 M Similarly, a pendulum portion 3a having a fan-shaped wide surface extending in the same longitudinal direction as the shaft rod 2 jointed to the input shaft side yoke 6N is sandwiched therebetween.
FIG. 9 is a side view seen from the right side of FIG. 8, showing a circular cross section of the input shaft 7 housed in the power transmission shaft mounting cylindrical portion 11 at the center of the upper portion, and a portion of the output shaft 8 extending downward. It is

FIGS. 10 to 12 show the cross shaft 1 of claim 2, and the plan view of FIG. 10 shows a shaft 2 having two shafts extending in four directions on the plane in a cross shape. The cross shaft 1 has square bar-shaped shaft portions 21 attached and fixed in four directions from a central cross shaft center portion shaft fixing metal 10, and a cylindrical 11 is a front view of FIG. 10, showing the cross shaft 1 composed of the square bar-shaped shaft portion 21 and the cylindrical shaft portion 22. , indicates that the positions of intersection of the two shafts of the cross shaft 1 where the two shafts intersect in a cross shape are staggered at an arbitrary interval. 12 is a perspective view of FIG. 10, showing the shapes of the square bar-shaped shaft portion 21 and the cylindrical shaft portion 22. As shown in FIG.

13 to 17 show the cross shaft 1 of claim 2, similar to FIGS. 10 to 12, and FIG. The cross shaft 1 on the inner side of the cross shaft 15 is indicated by a broken line. After inserting, the part of the cylindrical shaft part 22 on the tip side is fixed by the shaft fastener 23,

14 is a plan view, in which the square bar-shaped shaft portion 21 extends from the outer ring portion opening portion 17 through which the shaft rod 2 provided in the cross shaft outer ring portion 16 passes, and the shaft of the cross shaft central portion shaft rod fixing metal fitting 10 at the center. The direction of inserting and fitting into the rod mounting opening 24 is indicated by a dashed arrow.

FIG. 15 is a perspective view showing a cross shaft 15 with an outer peripheral ring portion configured with a square bar type shaft portion 21.
FIG. 16 is a perspective view similar to FIG. 15, but the pendulum part 3 of claim 1 is provided, and the pendulum part 3a is provided upward and the pendulum part 3b is provided downward. Reference numeral 3 protrudes from the cross shaft center rod fixing metal fitting 10 and the cross shaft outer ring portion 16, respectively. It shows that they are integrated via 3b.

FIG. 17 is a front view of the embodiment, in which the yoke 6 is attached to the outer peripheral ring portion installation type cross shaft 15 provided with the pendulum portion 3 of FIG. A square bar-shaped shaft portion 21 jointed by a two-layer structure bearing portion 5N provided at the top and bottom of the input shaft side yoke 6N, which is divided into two parts, is provided at a position behind the cross shaft outer ring portion 16. However, it can be seen that it is in the vertical position at the positions of the upper and lower axial rod fasteners 23 of the cross shaft outer ring portion 16 .

Also, the position of the shaft-bar fastener 23 is that the square-bar-shaped shaft portion 21 jointed by the two-layer structure bearing portion 5M provided at the tip of the output-shaft-side yoke 6M of the left output shaft 8 is in a horizontal position. which can be determined by
The positions of the center lines of the square-bar-shaped shaft portion 21 jointed to the input shaft-side yoke 6N and the square-bar-shaped shaft portion 21 jointed to the output shaft-side yoke 6M are shifted at an arbitrary interval, This interval is shown as a space S between the two dashed lines and the arrow on the right.

Furthermore, the input shaft side yoke 6N is jointed to the square bar-shaped shaft portion 21 closer to the output shaft 8 side, and the output shaft side yoke 6M is jointed to the square bar-shaped shaft portion 21 closer to the input shaft 7 side. In the configuration, the difference between the two sides of each other is shown as the difference S between the two dashed lines and the arrows on the left side. It shows that it has a structure that bites into the body.

In addition, the pendulum portion 3 is powered by the cross shaft outer ring portions 16 on both end side portions of each square bar type shaft portion 21 and the center cross shaft central portion shaft fixing metal fitting 10. Protruding in the direction of the transmission shaft,
The pendulum portion 3a on the side of the vertical square bar-shaped shaft portion 21 jointed to the yoke 6N on the input shaft side is slidably sandwiched between the rotational force transmission fulcrum and the guide portion 4 of the yoke 6M on the output shaft side. and
The pendulum portion 3b on the side of the square bar-shaped shaft portion 21 in the sideways position jointed to the yoke 6M on the output shaft side is slidably sandwiched between the rotational force transmission fulcrum and the guide portion 4 of the yoke 6N on the input shaft side. hand,
It shows that the transmission fulcrum of the rotational power is a three-dimensional structure consisting of three points each of the square bar-shaped shaft portion 21 on the plane and the pendulum portion 3 in the vertical direction.

FIG. 18 is a perspective view showing a cross shaft 1 consisting of a square-bar-shaped shaft portion 21, and a bearing portion 5 having a two-layer structure according to claim 3 of the present invention is attached to each of the square-bar-shaped shaft portions 21. FIG. 19 is a single perspective view of the double-layered bearing part 5, the outer cylindrical part being the rotatable outer bearing part 52, the inner being the vertical and square bar type It shows that there is a slidable inner bearing portion 51 on the flat surface extending in the longitudinal direction of the shaft portion 21, and that a space portion for a square bar type shaft portion storage portion 55 is provided in the center portion. .

FIG. 20 is a front view showing the bearing part 5 with a two-layer structure. A ball bearing 53 is provided on the space side of 55, and the square bar type shaft portion 21 is housed in the square bar type shaft portion storage portion 55 of the space portion, and is vertically movable. A space S is represented by two dashed lines and an arrow, respectively.

FIG. 21 is a perspective view of an embodiment, in which the pendulum part 3 of claim 1 is not provided, and the yoke 6 provided with the double-layered bearing part 5 of claim 3 on the cross shaft 1 of claim 2 is rotated. It represents that it is freely slidable and jointed.

By improving the transmission force of rotational power transmission of engines, motors, power generators, etc., and by supplying it with a low cost and simple structure, it is also useful for industrial development.

1 Cross shaft 2 Axle 3 Pendulum part 3a Pendulum part 3b Pendulum part 4 Rotary power transmission fulcrum and guide part (provided at the fork of the yoke)
5 Double-layered bearing 5N Double-layered bearing (on the input shaft side)
5M double-layered bearing (on the output shaft side)
6 Yoke 6N Yoke on the input shaft side 6M Yoke on the output shaft side 7 Input shaft 8 Output shaft 9 Joint (rotatably connected by bearings)
15 Peripheral Ring Mounted Cross Shaft
S isolated interval or space

In addition, the pendulum part integral with the cross shaft type universal joint slides between the two forks of the joint yoke which is divided into two forks at the tip of the power transmission shaft, while being sandwiched between the two forks of the joint yoke. The pendulum motion is a high-frequency swinging motion that occurs twice in one rotation of the power transmission shaft. It is preferable that a roll bearing be provided at the guide part and a fulcrum for transmitting rotational power.

Claims (3)

A cross shaft type universal joint consisting of two shafts that integrate straight lines into a cross shape on a plane, wherein the shafts of the cross shaft type universal joint are an input shaft and an output shaft, which are rotational power transmission shafts. It is a structure in which each shaft is rotatably jointed by joint yokes, also called bifurcated metal fittings, on either side of the shaft. From the outer both ends of the joint part on both sides of the central part of the shaft rod or the central part and the central part in the opposite vertical direction from the outer end side of the joint part, A pendulum part that forms one side of a circle, such as a fan shape or a semicircle shape that traces the trajectory of the tip of the pendulum, protrudes around the tip, and is fixed integrally with the cross shaft type universal joint. The input shaft and the output shaft of the power transmission shaft are jointed to the shaft rod that protrudes the pendulum portion toward the power transmission shaft on the other side, and the shaft is jointed to the other side. The pendulum portion of the axial rod is sandwiched between the forks of the joint yoke on its own side so that the pendulum portion slides between the two forks of the joint yoke to perform the pendulum motion. When the pendulum portion is also pendulum-moving due to the swing motion of rotating and changing the angle at the tip of the joint yoke while the cross shaft type universal joint rotates to transmit the rotary power, the pendulum portion is moved to the two In addition, the joint yoke portion of the part that is sandwiched and slid is used as a guide portion that guides the orbit of the pendulum portion without shaking, and is provided as a new fulcrum for transmitting the rotational force of the rotational force of the power transmission shaft. A cross shaft type universal joint with improved power transmission force characterized by: A cross-shaft universal joint comprising two straight shafts integrally fixed in the shape of a cross or in claim 1, wherein the two straight shafts of the cross-shaft universal joint are perpendicular to each other. A cruciform universal joint with improved power transmission force characterized in that the center lines of the shaft rods at the intersecting positions are not intersected at the same point but are intersected at an arbitrary interval. The center portion of the cross-axis universal joint according to claim 2, wherein two straight shafts are integrated in a cross shape in which two straight shafts are crossed at right angles so as to extend in four directions on a plane. Power transmission on both surfaces facing the plane direction of each of the four axial rod portions extending in four directions from the adjacent surfaces facing the axial rod that are both lateral sides extending in four directions The shape of the joint portion between the input shaft and the output shaft of the shaft or the shape of the joint portion and the adjacent portion is a flat flat surface perpendicular to the plane, and the flat surface is inside the joint portion of the input shaft and the output shaft. and the cross shaft type universal joint is slidable from the joint portion in the vertical direction from the plane and in the longitudinal direction of the shaft rod. Cross shaft universal joint with improved force

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