JPH0530587U - Shock absorbing coupling - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a shock-absorbing coupling which has low cost of processing and assembly, high shock-absorbing performance and high durability. [Structure] An approximate polygonal protrusion 2a with rounded corners is integrally formed on one transmission member 2, and an approximate polygonal recess 1a with rounded corners is formed on the other transmission member 1, and the protrusion is formed in the depression. And the elastic body ring 3 is interposed in the groove formed between the recess and the protrusion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shock absorbing coupling for transmitting rotation, and more particularly to a shock absorbing coupling suitable for an actuator utilizing the rotation of various motors.

[0002]

[Prior Art]

 In actuators that utilize the rotation of various motors, generally, the control operation is initialized by abutting the movable stopper of the actuator against the fixed stopper. A shock absorbing coupling is used to absorb the shock at the time of this butting. FIG. 3 shows an example of a conventional shock absorbing coupling. Reference numerals 1 and 2 shown in the drawing denote outer and inner transmission members, respectively, which are coaxially arranged and in which a ring-shaped rubber member 4 is arranged. The rubber member 4 is fixed to the transmission members 1 and 2 by adhesion or insert molding, and rotational movement is transmitted between the transmission member 1 and the transmission member 2. The impact is absorbed by the elasticity of the rubber member 4.

FIG. 4 shows another example of a conventional shock absorbing coupling. 1 and 2 shown in the figure are outer and inner transmission members, respectively. The transmission member 2 is provided with projections 2a, 2a ... And the rubber members 5 are baked on the projections 2a, 2a. The transmission member 1 is provided with recesses at positions corresponding to the protrusions 2a, 2a ... And the rubber member 5 is fitted into the recesses. Rotational motion is transmitted between the transmission member 1 and the transmission member 2. The impact is absorbed by the elasticity of the rubber member 5.

[0004]

[Problems to be solved by the device]

 The conventional shock absorbing coupling described above has a problem in that the rubber member has to be fixed to the transmission member by a method such as adhesion or baking, which results in high processing and assembly costs. Moreover, there is a possibility that defective products may be generated due to defective adhesion.

The present invention has been made to solve the above problems, and it is an object of the present invention to provide a shock absorbing coupling which does not require a rubber member to be fixed to a transmission member and which is inexpensive to process and assemble. And

Another object of the present invention is to provide a shock absorbing coupling having good shock absorbing performance and excellent durability.

[0007]

[Means for Solving the Problems]

 The device shock absorbing coupling of the present invention has one transmission member integrally formed with an approximately polygonal projection with rounded corners, and the other transmission member having an approximately polygonal recess with rounded corners. The projection is inserted into the recess, and the elastic ring is interposed in the groove formed between the recess and the projection.

[0008]

[Action]

 According to the shock absorbing coupling of the present invention, since the elastic body ring is sandwiched between the projections and the depressions of the approximate polygons of both transmission members, the rotation can be transmitted without fixing the elastic body ring to the transmission member. .. Therefore, there is no bonding work, and the processing and assembly costs are low. Moreover, since the elastic ring is not fixed, the load is not locally concentrated, and the durability is improved.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 (a) is a plan view showing a shock absorbing coupling which is an embodiment of the present invention, and FIG. 1 (b) is a sectional view showing the shock absorbing coupling. Reference numerals 1 and 2 shown in the drawing denote outer and inner transmission members, respectively. A gear 1b is provided on the outer circumference of the transmission member 1, and an approximately square-shaped recess 1a with rounded corners is provided inside. A gear 2b is provided on the lower portion of the transmission member 2, and an approximately square protrusion 2a with rounded corners is provided on the upper portion. The shaft of the transmission member 2 is fitted in the round hole of the transmission member 1 in a sliding state, and the transmission member 2 and the transmission member 1 are coaxially assembled. The O-ring 3 covers the projection 2a during assembly, and the O-ring 3 is arranged between the recess 1a and the projection 2a in the assembled state. Rotation is transmitted from the transmission member 1 to the transmission member 2 via the O-ring 3, and the shock is absorbed by frictional resistance between the O-ring 3 and the transmission member 1 or 2 and bending of the O-ring 3.

FIG. 2 is a perspective view showing a rotary actuator using the shock absorbing coupling. The gear 6a provided on the rotating shaft of the motor 6 meshes with the gear 1b of the shock absorbing coupling, and the gear 2b of the shock absorbing coupling meshes with the gear 7b of the rotating body 7. The rotating body 7 is supported by a plunger 9 so as to be slidable in the axial direction, is biased upward by a coil spring 10, and is pressed against a bearing (not shown). The rotating body 7 transmits rotation to the plunger 9, and its shaft 7a is connected to a drive unit such as a flow control valve. The male screw provided on the plunger 9 is screwed with the screw because it is provided on the frame 8, and the plunger 9 moves up and down as it rotates. The movable stopper 9a provided integrally with the plunger 9 comes into contact with the stopper 8a fixed to the frame 8 when the plunger 9 descends. The gear 11a of the rotating body 11 meshes with the gear 7b, and the magnets 11b and 11b provided on the rotating body 11 are close to the hall sensors 12 1 and 12. The two Hall sensors 12, 12 generate a two-phase pulse and detect the rotation speed and rotation direction of the rotation actuator. The rotation actuator configured as described above is initialized by rotating the motor in the direction in which the plunger 9 descends and abutting the movable stopper 9a against the fixed stopper 8a.

FIG. 5 shows the impact absorption characteristics when the movable stopper 9a is abutted against the fixed stopper 8a. The lower graph shows the motor current, and the upper graph shows the Hall sensor output pulse. The current when the motor is rotating is small, and the current when the motor is stopped is large. Hall sensor output pulse does not occur when the motor is stopped. As shown in the figure, the rise time of the motor current is 9.38 ms and the settling time is 20.21 ms. The rise time of the motor current indicates the time from when the stopper abuts until the rotation stops, and the settling time indicates the time until the vibration converges. It is desirable that the settling time is short in order to speed up the operation of the actuator.

FIG. 6 shows data obtained by replacing the shock absorbing coupling in the rotary actuator of FIG. 2 with the conventional one shown in FIG. Comparing FIG. 5 and FIG. 6, it is shown that the present invention has a long rise time and a small impact force at the time of collision. Moreover, the settling time of the present invention is significantly shorter than that of the conventional one.

The shock absorbing coupling of the present invention shown in FIG. 1 is incorporated in the rotary actuator of FIG. 2, and the conventional shock absorbing coupling shown in FIG. 4 is incorporated in the rotary actuator of FIG. When the endurance test was conducted under the same conditions, the one of the present invention showed no damage to the O-ring after the impact of 650,000 times, and the conventional one had 4 pieces after the impact of 450,000 to 500,000 times. The rubber member was cracked and damaged. That is, according to the present invention, the durability of the shock absorbing coupling can be improved.

Although the embodiment is configured as described above, the invention is not limited to this. For example, even if the projections and recesses of the transmission member are polygons such as triangles and pentagons instead of squares, the invention is not limited to this. The effect of can be obtained.

[0015]

[Effect of the device]

 As described above, according to the shock absorbing coupling of the present invention, processing and assembling costs are reduced. In addition, shock absorption performance and durability are improved.

[Submission date] April 19, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

[0012] Figure 6 is the rotary actuator of FIG. 2 shows the data measured by replacing the conventional to be of illustrating the shock absorbing coupling in FIG. Comparing FIG. 5 and FIG. 6 shows that the present invention has a long rise time and a small impact force at the time of collision. Moreover, the settling time of the present invention is significantly shorter than that of the conventional one.

[Brief description of drawings]

FIG. 1 (a) is a plan view showing a shock absorbing coupling according to an embodiment of the present invention, and FIG. 1 (b) is a sectional view showing the shock absorbing coupling.

FIG. 2 is a perspective view showing a rotary actuator using the shock absorbing coupling.

FIG. 3 (a) is a plan view showing an example of a conventional shock absorbing coupling, and FIG. 3 (b) is A- in FIG. 3 (a).
FIG.

FIG. 4 is a plan view showing another example of a conventional shock absorbing coupling.

FIG. 5 is a graph showing shock absorbing characteristics of a shock absorbing coupling according to an embodiment of the present invention.

FIG. 6 is a graph showing impact absorption characteristics of a conventional impact absorption coupling.

[Explanation of symbols]

 1 transmission member 2 transmission member 3 O-ring 6 motor

Claims (1)

[Scope of utility model registration request] 1. An approximately polygonal protrusion with rounded corners is integrally formed on one transmission member, and an approximately polygonal recess with rounded corners is formed on the other transmission member, and the protrusion is inserted into the depression. A shock absorbing coupling in which an elastic ring is interposed in a groove formed between the recess and the protrusion.