JPS63149418A - Universal joint - Google Patents

Abstract

PURPOSE:To prevent fluctuation in sliding frictional resistance for effective power transmission from a driving shaft to a driven one by providing the first torque transmitting member with the first and the second projecting body, and the second torque transmitting member with the third and the fourth projecting body. CONSTITUTION:The first and the second torque transmitting member 60, 70 have guide planes 61, 71 for guiding a driving shaft 10 and a driven shaft 20. The guide plane 61 is solidly formed with the first and the second projecting body A, B at two spots in its diametrical direction, and the guide plane 71 is also solidly formed with the third and the fourth projecting body C, D at two spots in its diametrical direction. Consequently, even when manufacturing tolerance causes the width of the first projecting body A to be narrower than that of another projecting body, the one side of the first arm 11 abuts on the one side of the first projecting A, and the one side of the second driving arm 12 abuts on the one side of the second projecting body B, and moreover the other projecting bodies C, D abut on driven arms in the same way as above- mentioned with force being the same in its strength at four abutting spots.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a universal joint called a so-called globe-shaped universal joint.

<Prior Art> A conventional universal joint of this type will be explained with reference to FIGS. 7 and 8.

FIG. 7 is a perspective view showing the universal joint in an exploded state, and FIG. 8 is a partial sectional view of the universal joint in an assembled state.

In these figures, reference numerals 10 and 20 are metal drive shafts and passive shafts, and one end of the drive shaft 10 has a bifurcated first. Second driving arm 1). 12 is also a passive wheel 20
The first one protrudes like a fork at one end of the. Second passive arm 21
．． 22 are formed respectively.

And this first one. Second driving arm 1). 12 and 1st. The second passive arm portion 21.22 has an outer surface and an inner surface formed in a partially spherical shape.

Reference numeral 30.40 indicates a first torque transmitting member and a second torque transmitting member made of synthetic resin or oil-impregnated sintered alloy;
．． The second torque transmission member 30.40 is connected to each of the drive arms 1). 12 and a partially spherical guide surface 31.4 that guides the inner surface of the passive arm portion 21.22 along the torque transmission direction.
1.

This guide surface 31.41 is integrally formed with protruding stripes a-wd, e-h that protrude outward in the radial direction at four equally spaced locations in the circumferential direction.

This first. A circular recess 32.42 is formed in the central portion of the opposing surface of the second torque transmission member 30.40 (
The recess 32 is not shown), and a small hole 33.43 is provided at a predetermined position on the periphery of the bottom of the recess 32.42 (the small hole 3
3 is not shown). The small holes 33.43 are arranged at positions shifted in the circumferential direction when the first and second torque transmission members 30.40 are butted against each other.

1st. The second torque transmitting members 30, 40 are arranged in opposite directions in the direction of torque transmission from the drive shaft 1° to the driven shaft 20, respectively. 12 and each passive arm 21.22. The first driving arm portion 1) includes a protrusion a,
The second driving arm 12 is connected between e and the protrusions S and r, and the first passive arm 21 is connected between the protrusion C+ g and the protrusions d and h.
The second passive arm 22 is between the protrusions a, e and the protrusions d.

h.

Reference numeral 50 denotes a coiled spring as an elastic member, which is interposed between the recess 32 (not shown) of the first torque transmission member 30 and the recess 42 of the second torque transmission member 40. One end of this coiled spring 5o is fitted into a small hole 33 (not shown) of the first torque transmission member 30, and the other end is fitted into a small hole 43 of the second torque transmission member 4o.

Due to the positional relationship between the small hole 33 (not shown) and the small hole 43, the coiled spring 50 is placed in the first position as shown by arrows X and Y in FIG.
．． It applies a twisting force in the rotational direction to the second torque transmission member 30, 40, and opens the drive arm 1). 1
2 and both passive arm parts 21 and 22 are configured to prevent wobbling in the rotational direction. Furthermore, the coiled spring 5o provides a repulsive force that causes the first torque transmission member 30 and the second torque transmission member 4o to repel each other, and the direction of torque transmission between the drive shaft 1o and the passive shaft 20 is It is configured to prevent sagging.

In this way, since each of the protrusions a to d and exh are equally distributed at four locations in the circumferential direction of the first and second torque transmitting members 30 and 40, the four protrusions of the first torque transmitting member 30 body a-d
between each of the first. The second driving arm portion 1)゜12 and the first driving arm portion 1)゜12. Both of the second passive arm portions 21 and 22 fit together, and similarly, the first and second passive arm portions 21 and 22 are fitted between each of the four protrusions e w h of the second torque transmission member 40 . The second driving arm portion 1)゜12 and the first driving arm portion 1)゜12. Second
Both of the passive arms 21, 22 now fit together, and the re-driving arms 1). 12 and both passive arm portions 21 and 22 are connected to the four protrusions a w d of the first torque transmitting member 30 and the second
It is configured to be restrained simultaneously by the four protrusions e % h of the torque transmission member 40 .

Now, when the drive shaft 10 is rotated in the normal direction as shown in the direction of arrow Z in FIG. At the same time that the second drive arms 1) and 12 begin to rotate, the first. Second torque transmission member 30
．． 1 through 40. Power is transmitted to the second passive arm portions 21 and 22, and the passive shaft 20 rotates in the same direction as the rotational direction of the drive shaft IO. Note that a description of the case where the drive shaft 10 is reversed will be omitted.

Moreover, although not shown, the drive shaft 10 and passive! 120 is “
Since it is used by being bent in the shape of a ``R'', when transmitting power, the side surfaces of each protruding strip body aw d of the first torque transmitting member 30 and each protruding strip body e to h of the second torque transmitting member 40 are 1st. Second driving arm 1). 12 and each side surface of the first and second passive arm portions 21 and 22 respectively slide relative to each other along the torque transmission direction.

In addition, the re-drive arm part 1). 12. If both the passive arms 21 and 22 and the protrusions axd and exh are manufactured with dimensional accuracy, for example, during the normal rotation described above, one side of the first drive arm 1) one side surface of the protrusion body f, one side surface of the second drive arm 12 and one side surface of the protrusion bodies d and h, the other side surface of the protrusion body f and one side surface of the first passive arm section 21 , the other side surfaces of the protrusions d, h and one side surface of the second passive arm portion 22, a total of four locations, are always in contact with each other with the same force.

<Problems to be solved by the invention> However, the re-driving arm 1). 12. Both passive arms 21
, 22 and the respective width dimensions and shapes of the protrusions a-d, e-h vary due to manufacturing precision tolerances. Specifically, as shown by the broken line in FIG. Assuming that the width of the protruding strip is smaller than that of the other protruding stripes, during normal rotation, the contact force at the contact point between the first drive arm 1) and the protruding strip will be weaker than the contact force at the other three locations. , in some cases they may not come into contact with each other.

This is true not only during forward rotation but also during reverse rotation.

Therefore, the first . Second drive reading section 1)゜12
and 1st. Each one side surface of the second passive arm portion 21.22 and each side surface of each protrusion body axd, exh transmit torque along both guide surfaces 31.41 of the 1° second torque transmission member 30.40. When sliding relatively in the direction, the sliding friction resistance is naturally different between contact at three locations and contact at four locations. Moreover, when the contact area changes depending on the rotation angle, the sliding frictional resistance fluctuates more rapidly, and when used for example in the wheel steering section of a car, the operating force becomes heavier or lighter, resulting in poor operating sensation. .

The present invention has been devised in view of the above circumstances, and includes a method in which each protrusion is brought into contact with the drive arm and the passive arm at four locations, regardless of manufacturing dimensional accuracy tolerances. The purpose is to prevent fluctuations in sliding friction resistance.

Means for Solving the Problems> In order to achieve the above object, the present invention has the following configuration.

That is, the universal joint according to the present invention has a first joint that protrudes in a bifurcated shape from the end of the drive shaft, and has a partially spherical inner surface. A second driving arm, and a first arm that protrudes in a bifurcated shape from the end of the driven shaft and has a partially spherical inner surface. Second
and a first arm interposed between the driving arm and the passive arm so as to face each other in the torque transmission direction at the intersection of the re-driving arm and both passive arms. a second torque transmission member; an elastic member that is interposed between the two torque transmission members and applies a repulsive force along the torque transmission direction and a twisting force in the rotational direction to both the torque transmission members; and a second torque transmission member; a partially spherical guide surface formed in each of the first torque transmitting members and guiding the inner surfaces of both drive arms and both passive bowls along the torque transmission direction; The first torque transmitting member is integrally formed at two locations in the diametrical direction and extends to the guide surface of the second torque transmitting member. a second protruding strip; integrally formed at two locations in the diametrical direction of the second torque transmitting member so as to be located radially outward from the guide surface of the second torque transmitting member; Extended 3rd. a fourth protruding body, the first protruding body is between the first driving arm and the first passive arm, and the second protruding body is between the second driving arm and the second passive arm. Between the department and the third
Torque is transmitted between the side surfaces in the circumferential direction between the protruding strip body and the first driving arm and the second passive arm, and the fourth protruding strip body between the first passive arm and the second driving arm. They are fitted in sliding contact with each other along the direction.

Effect〉 The effects of the configuration of the present invention are as follows.

The first torque transmitting member includes a first torque transmitting member. There is only the second protruding member, and the second torque transmitting member also has a third member. Since there is only the fourth protrusion, even if the dimensional accuracy is somewhat poor, the first protrusion of the drive shaft can be used in both forward and reverse rotation. The second drive arm and the first drive arm. the second passive arm; and the first passive arm. The second protrusion and the third. It is no longer restrained by both the fourth protruding body and the fourth protruding body at the same time.

Therefore, in both forward and reverse rotation, both sides of one protrusion in one torque transmission member are aligned with the side of one driving arm and one passive arm, without being affected by dimensional accuracy. and the side surfaces of the other protrusion in one torque transmission member contact with the same force the side surfaces of the other drive arm and the side surfaces of the other passive arm. Become. In other words, since all four locations of each contact portion come into contact with the same force, fluctuations in sliding frictional resistance are prevented.

<Example> Hereinafter, an example of the present invention will be described in detail based on the drawings.

In this embodiment, only the components different from the conventional example will be explained in detail. An embodiment of the present invention is shown in FIGS. 1 and 2, and in these figures, the same reference numerals as in FIGS. 7 and 8 refer to the same parts. Note that FIG. 1 is an exploded perspective view of the universal joint, and FIG. 2 is a partial sectional view showing the universal joint in an assembled state.

As can be seen from the figure, the components in this embodiment that are different from those in the conventional example are the first. These are second torque transmission members 60 and 70.

1st. The second torque transmission member 60.70 has a drive shaft lO
Both driving arms 1). 12 and a partially spherical guide surface 61 that guides the inner surfaces of both passive arm portions 21 and 22 of the passive shaft 2o.
, 71, respectively.

2 in the diametrical direction of the guide surface 61 of the first torque transmission member 6o
At the location, the first . The second protrusions A and B are integrally formed. Also, at two locations in the diametrical direction of the guide surface 71 of the second torque transmitting member 7o, third bolts protrude radially outward and extend to the guide surface 61 of the first torque transmitting member 6o. The fourth protrusions C and D are integrally formed.

The inner surface of each of the protrusions A to D is formed into a partially spherical shape similar to the conventional example, and in this case, the first and second torque transmitting members 60 and 70 are made of synthetic resin material, Projection body A
-D are assembled in a state where they face each other in the torque transmission direction by utilizing the elastic deformation.

1st. Recesses 6 in each of the second torque transmission members 60 and 70
2, 72 and small holes 63, 73 are formed similarly to those of the conventional example (the recess 62 and small hole 63 are not shown).

The first drive arm portion 1) of the drive shaft 10 is connected to the first protrusion body A.
and the third protruding body C, the second drive arm 12 is between the second protruding body B and the fourth protruding body C, and the first driven arm 21 of the passive shaft 20 is between the second protruding body B and the fourth protruding body C. The second passive arm portion 22 is fitted between the first protrusion body A and the fourth protrusion body, and between the second protrusion body B and the third protrusion body C, so that the side surfaces in the circumferential direction are configured to come into sliding contact with each other along the torque transmission direction.

As mentioned above, the first. The second protrusions A and B, and the third. Since the fourth protrusions C and D are separate objects, the drive shaft 10 and the passive shaft 20 are the first part, the second protrusions A and B and the third part. They are not restrained by the fourth protrusions C and D at the same time.

Therefore, even if, for example, the width of the first protruding strip A is smaller than other protruding stripes due to manufacturing precision tolerances, one side of the first drive arm 1 On one side of the body A, one side of the second driving arm 12 is on one side of the second protruding body B, and the other side of the first protruding body is on one side of the first passive arm 21. The other side surface of the second protruding strip B always comes into contact with one side surface of the second passive arm section 22 at four locations in total with the same force.

Further, even in reverse rotation, the other side of the first drive arm 1) is on one side of the third protrusion C, the other side of the second drive arm 12 is on one side of the fourth protrusion, and The other side surface of the third protrusion C is applied to the other side of the second passive arm 22, and the other side of the fourth protrusion is applied to the other side of the first passive arm 21, making sure that the same force is applied to a total of four locations. They come into contact with each other.

In this way, in both forward and reverse rotation, the four locations come into contact with the same force at the same time without being affected by the dimensional accuracy of each component, so the contact portion during rotation Fluctuations in sliding friction resistance are prevented.

FIG. 3 shows another embodiment of the invention.

The configuration of this embodiment differs from that of the embodiment shown in FIG.
．． Guide surfaces 61, 71 of second torque transmission member 60.70
/J for positioning the protrusion of the other party's torque transmission member.
! 64, 65, 74.75 are formed.

The grooves 64.65 are formed on the guide surface 61 between the first protruding body A and the second protruding body B, and the grooves 74.75 are formed on the third protruding body C.
and the fourth protrusion body, and are formed on the guide surfaces 71 between the third protrusion body C and the fourth protrusion body C of the second torque transmission member 70 to be positioned at the corners 64 and 65. Inner surface part 76
, 77 are configured to be thick, and the first protruding member A of the first torque transmitting member 60 to be positioned in the groove 74.75.
The inner surfaces 66 and 67 (not shown) of the second protruding strip body B are thick.

The width of the grooves 64, 65, 74, 75 is 1. Second
The width of the ridges A and B and the third. The width is set to be somewhat larger than the width of the fourth protrusions C and D.

That is, in this embodiment, when the second torque transmission member 70 is butted against the first torque transmission member 60, the guide surface 61
．． The effect is that the positioning of each of the protrusions A to D on 71 can be easily performed.

FIG. 4 shows yet another embodiment of the invention. This embodiment has a different configuration from the embodiment shown in FIG. This is where the slit 80 is formed.

The width of each of the protrusions A to D is formed to be slightly larger than that described in the above embodiment, and the redrive arm portion 1) of the drive shaft IO. 12 and both passive arms 21.2 of the passive wheel 20
2 is fitted, the distance between the slits 80 becomes narrower,
It is configured to eliminate rattling in the rotational direction between the drive shaft lO and the passive shaft 20.

In the case of this embodiment, the slits 80 are configured to absorb dimensional variations in the protrusions A-D due to manufacturing precision tolerances, and during rotation, the re-drive arm 1) of the drive shaft 10. 12 and both passive arm portions 21, 22 of the passive shaft 20, all the protrusions A to D are brought into contact with substantially the same force.

By the way, the re-drive arm portion 1) of the drive shaft 10. 12 and both passive arm portions 21.22 of the passive wheel 20, and the first. Since each of the protrusions A to D of the second torque transmission member 60, 70 is configured to slide in the torque transmission direction between the circumferential side surfaces, lubricant is applied to the contact portion. There is a need. In order to stably retain this lubricant on the contact portion, the re-drive arm 1) of the drive shaft 10, as shown in FIGS. 12 and the passive shaft 200. By forming recesses such as a plurality of long grooves 90 or small holes 91 in the circumferential side surfaces of both the passive arm parts 21.22, the lubricant may be held in the recesses. It is possible.

Of course, the recess for holding the lubricant is located between the first and second torque transmitting members 60 as shown in FIG.
．． It is also possible to form them on each sliding surface of each of the 70 protrusions A to D.

In each of the above embodiments, the elastic member is wound around the spring 50.
However, it is also possible to use rubber or the like as this elastic member.

<Effect of the invention> According to the present invention, the following effects are achieved.

The first torque transmitting member includes a first torque transmitting member. The second protruding body is also the second
The torque transmission member has a third. Since there are only two fourth protrusions, there are only two fourth protrusions. The second drive arm and the first drive shaft. The second passive arm is the first passive arm. The second protrusion and the third. It is not restrained by both of the fourth protrusions at the same time.

Therefore, even if the dimensional accuracy of each component is somewhat poor, both side surfaces of both protrusions of the first torque transmitting member or both protrusions of the second torque transmitting member and the drive shaft can be maintained in either forward or reverse rotation. It is possible to bring the re-driving arm into contact with each other and each side of the passive arm of the passive shaft at the same time and with the same force at four locations.

Therefore, since fluctuations in sliding frictional resistance can be prevented, power can be effectively transmitted from the drive shaft to the passive shaft. Therefore, when used in a wheel steering section of an automobile, for example, the operating force is neither heavy nor light, contributing to an improvement in the operating feel.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 show one embodiment of the present invention;
The figure is an exploded perspective view of the universal joint, and FIG. 2 is a partial sectional view of the universal joint in an assembled state. 3 to 6 show other embodiments of the present invention, FIG. 3 is an exploded perspective view of the universal joint, FIG. 4 is an exploded perspective view of the universal joint, and FIG. bl is a partial cross-sectional side view of the drive shaft or passive shaft;
Figure 6+al and mountain) are shown in Figure 1. FIG. 7 is a partially cross-sectional side view of the second torque transmission member. Further, FIGS. 7 and 8 show a conventional example, with FIG. 7 being an exploded perspective view of the universal joint, and FIG. 8 being a partial sectional view of the universal joint in an assembled state. lO... Drive shaft 1)... First drive arm 12... Second drive arm 20... Passive shaft 21... First passive arm 22... Second passive arm 50 ... Coiled spring (elastic member) 60 ... First torque transmission member 61 ... Guide surface 70 ... Second torque transmission member 71 ... Guide surface A ... First protrusion body B. ...Second protruding body C...Third protruding body D...Fourth protruding body.

Claims (5)

[Claims] (1) First and second drive arms protrude in a bifurcated manner from the end of the drive shaft and have a partially spherical inner surface, and bifurcated protrusions from the end of the driven shaft and have a partially spherical inner surface. The first formed in
, a second passive arm, and a first arm interposed between the driving arm and the passive arm so as to face each other in the torque transmission direction at the intersection of the driving arm and the passive arm. a second torque transmission member; an elastic member that is interposed between the two torque transmission members and applies a repulsive force along the torque transmission direction and a twisting force in the rotational direction to both the torque transmission members; and a second torque transmission member; a partially spherical guide surface that is formed in each of the first torque transmitting members and guides the inner surfaces of the driving arms and the passive arms along the torque transmission direction; first and second protrusions that are integrally formed at two locations in the diametrical direction and extend to the guide surface of the second torque transmitting member; third and fourth protrusions that are integrally formed at two locations in the diametrical direction while being located radially outward from the guide surface and extend to the guide surface of the first torque transmission member; The first protrusion body is between the first drive arm and the first passive arm, the second protrusion body is between the second drive arm and the second passive arm, and the third protrusion body is between the second drive arm and the second passive arm.
Torque is transmitted between the side surfaces in the circumferential direction between the protruding strip body and the first driving arm and the second passive arm, and the fourth protruding strip body between the first passive arm and the second driving arm. A universal joint characterized by being fitted together in sliding contact with each other along a direction. (2) The first and second torque transmitting members each have grooves on their guide surfaces for positioning the two protrusions of the mating torque transmitting member.
Universal joint described in section 1). (3) Each of the protrusions of the first and second torque transmitting members is provided with a slit extending over the entire length in the longitudinal direction near the center in the width direction.
) The universal joint described in any one of the items. (4) Each of the driving arm portions and each passive arm portion is provided with a recess for holding lubricant on the sliding surface thereof with each of the protruding stripes. The universal joint according to any one of paragraph (3). (5) A patent in which each of the protrusions of the first and second torque transmitting members is provided with a recess for holding lubricant on the sliding contact surface with each of the driving arms and each of the passive arms. Claim No. (1)
The universal joint according to any one of paragraphs to (3).