JPS62113917A - Universal coupling - Google Patents

Abstract

PURPOSE:To remove backlash without increasing the working accuracy by providing a recess and projection engaging portion for individually transmitting driving torque of clockwise and counter-clockwise rotation, and closely contacting the projecting portion and the recess portion by an elastic member on receiving corresponding driving torque. CONSTITUTION:Projecting portions 3a, 3b and 4a, 4b of face members 3, 4 are inserted in inserting portions 5k, 5l and 5m, 5n of an intermediate face member 5 from both faces thereof and connected to each other. In this case, the intermediate face member 5 is automatically aligned, so that the projecting portions 3a, 3b, 4a, 4b are always pressed to a step portion of the intermediate face member 5 by elastic force of a pressing metal 50 tightened by a bolt 52 through a coiled spring 51. Even if the axes of rotary shafts 1, 2 are not aligned with each other, it can be absorbed by a margin in length of the step portion of the intermediate face member 5 and a change in contact angle between the face members.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention prevents bank lash by bringing the convex-concave engaging portion provided in the shaft joint of a rotating shaft into close contact with an elastic member.
For example, it relates to a universal joint used in a shaft system of a testing device or the like.

[Conventional technology]

Examples of conventional universal joints include Cardan joints, constant velocity joints, and Oldham joints.

Figure 3 shows an example of an Oldham joint and a test device using it. This shaft joint is installed between the surface members 3 and 4, which are mounted opposite to the ends of the rotating shafts 1 and 2 and have concave grooves 3c and 4c, respectively, and is perpendicular to both surfaces. It consists of an intermediate surface member 5 having a protrusion 5s and a protrusion 5s provided as a convex portion. The protrusions 5s and 5t of the intermediate surface member 5 fit into the grooves 3c and 4c of the surface members 3 and 4, respectively, so that the rotating shafts 1 and 2 are connected.

FIG. 3 shows a test device using this shaft joint, for example, a transmission test device. On the rotating shaft 1 side, there is a drive motor 7 that rotationally drives the rotating shaft 1a, and a drive motor 7 that rotates the rotating shaft 1a at a predetermined rotation speed. Reducer 6 that reduces the speed and transmits it to the rotating shaft 1
are connected. A one-way clutch 8, which is a test object, is connected to the rotating shaft 2 side, and the other end of the one-way clutch 8 is connected to the torsion shaft 2a. On the other hand, the shaft end 11 of the rotating shaft 11 is driven by another drive unit (not shown).
A wheel 10 is attached to the wheel 10, and a rotation fulcrum 1°a and a torsion shaft 2 are located on a radius close to the circumference of the wheel 10.
The shaft end 2b of the shaft a is connected by two links 9a and 9b connected at a rotation fulcrum 9C, and the link 9a is fixed to the rotation shaft 2a at the shaft end 2b.

In the above configuration, when the drive motor 7 rotates the rotary shaft 1a, the rotary shaft 1 is rotated in one direction at a predetermined number of rotations by the reducer 6. This rotation is transmitted to the rotating shaft 2 by the aforementioned shaft joint. On the other hand, when the wheel 10 is rotated in one direction by a drive source (not shown), the rotation shaft 2a alternately swings within a certain angle in both forward and reverse directions due to the link connection with the links 9a and 9b. When the one-way clutch 8 receives rotation in the torque transmission direction, it transmits torque to the rotating shaft 2,
When the rotation is in the opposite direction, no torque is transmitted.

Figure 4 shows the state of torque transmission, where A is the rotating shaft 2 side, B
is the change in torque of one example of the rotating shaft. In A, T.I.
T2 (positive) is the torque that drives the joint portion from the torsion shaft 2a, and T2 (negative) is the torque that is driven from the reducer 6. B corresponds to A, and T, (
T4 (positive) causes the reducer 6 to drive the joint portion, and T4 (negative) causes the reducer 6 to be driven.

[Problem that the invention seeks to solve]

However, in the conventional universal joint, A and B in Fig.
As shown in , they are rotated alternately and at a rotation speed determined by the reducer 6, so if there is backlash in the convex-concave engagement part, the speed will change in the joint part, which is an inconvenience that will reduce the accuracy of the test results. be. In addition, there is a drawback that increasing the machining accuracy of the engaging portion until bank lash is eliminated increases the cost.

[Means and effects for solving the problem] The present invention has been made in view of the above, and in order to eliminate bank rash without increasing the cost due to increased machining accuracy, it is possible to The present invention provides a universal shaft joint in which concave and convex engaging portions for transmitting driving torques in different directions are provided, and the convex portion and the concave portion are brought into close contact with each other by an elastic member when receiving the corresponding driving torques.

〔Example〕

Hereinafter, the universal joint according to the present invention will be explained in detail. 1st
2A and 2B show an embodiment of the present invention, and the same parts as in FIG. and 4 have protrusions 3a, 3b and 4a, 4b, respectively, and the intermediate surface member 5 has, for example, one side that is stepped in shape to suppress the protrusions as shown in FIG. It is formed by two opposing sides. Step portions 5a, 5b, and 5C forming an insertion portion 5k of one protrusion 4a, a holding fitting 50 that suppresses the protrusion 4a, a coil spring 51 that elastically suppresses the holding fitting 50, and a bolt 52 that tightens the holding fitting 50. It becomes more. The same applies to the insertion portions 51, 5m, and 5n of the other projections 3b, 4a, and 4b.

In the above configuration, the protrusions 3a and 3b of the surface member 3 and the protrusions 4a and 4b of the surface member 4 are connected to the insertion portion 5k of the intermediate surface member 5.
, 51 and 5m, 5n from both sides to be connected. In this case, since the intermediate surface member 5 is self-aligned, the protrusions 3a, 3b, 4a, 4b can be adjusted without increasing the machining accuracy.
is always set in close contact with the staircase portion (for example, the portion 5a) due to elastic force.

When the suppression of the protrusion is shown for the protrusion 3a of the surface member 3,
It is held down by the step portion 5a of the intermediate surface member 5 and the holding fitting 50, and the holding fitting 50 is tightened by the port 52 via the coil spring 51. This also applies to the other protrusions 3b and the protrusions 4a and 4b of the opposing surface member 4.

When the axes of the rotating shafts 1 and 2 do not coincide, or even when the axes intersect at a certain angle, for example, the length margin of the staircase section shown by 5a or the contact angle between the intermediate surface member and the pair of surface members It can be absorbed by changes in

In the above embodiment, an example was shown in which the protrusions of a pair of surface members are held down and the coil springs are clamped using metal fittings to eliminate the gap, but as shown in FIG. One surface may have a step-like shape as shown in FIG. The protrusion 3 of the member may have a rectangular cross-section and be held down by a leaf spring 53 as shown in FIG. 2(B), and as shown in FIG. 51, and a U-shaped groove-shaped receiving part 5k is provided in parallel with 5h in the vicinity thereof as a receiving part for the protruding part 3a of the surface member, and the fastening provided in the stepped part 5h is received from the hole 51. Alternatively, the protrusion 3a of the surface member inserted into the portion 5k may be held down, and the coil spring 56 may be held between the pieces 55 and the screw 57 may be tightened.

Further, in the above embodiment, the projections were provided on the side of the pair of surface members and the receiving portions were provided on the side of the intermediate surface member, but conversely, the receiving portions may be provided on the side of the pair of surface members and the projections on the side of the intermediate surface member. good.

〔Effect of the invention〕

As explained above, according to the universal joint of the present invention, the concave and convex engagement portions that transmit clockwise and counterclockwise driving torques separately are provided, and when receiving the respective driving torques, the elastic member engages the convex portions. Since the concave portions are placed in close contact with each other, backlash can be eliminated without increasing the cost due to increased machining accuracy.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a universal joint according to the present invention and a test device to which the same is applied. FIGS. 2(A) to 2(D) are explanatory diagrams showing the configuration of the universal joint of the present invention. FIG. 3 is an explanatory diagram showing a conventional universal joint and a test device to which it is applied. FIG. 4 is an explanatory diagram showing the operation of the test device shown in FIG. 3. Explanation of symbols 1.1a--Rotating shaft 2.2a--Rotating shaft 2 b -1--...One shaft end 3.4
-・------One side member 3a, 3b, 4a, 4b
-------One protrusion 3c, 4c---Groove part 5---Intermediate surface member 5a to 5r---1-
--- Stairs section 51・-・-・・−・-Tightening hole 5
k ~5 n-・-----One receiving part 5s, 5 one protruding part 50--------Pressure metal fitting

Claims (1)

[Scope of Claims] The surface member is composed of a surface member provided at one end and an end of another shaft opposite to the end, and an intermediate surface member located between both of the surface members. and a universal shaft joint that transmits driving torque between the shafts by a convex-concave engaging portion formed on the intermediate surface member, wherein the concave-concave engaging portion includes a first engaging portion that transmits clockwise driving torque; It has a second engaging part that transmits a driving torque in a counterclockwise direction, and when the first and second engaging parts receive the driving torque in the corresponding direction, the convex part is brought into close contact with the concave part by an elastic member. A universal joint characterized by: