JPH0768980B2 - Leaf spring coupling - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leaf spring coupling for connecting a pair of flanges with a leaf spring.

[0002]

2. Description of the Related Art In this type of leaf spring coupling, as shown in FIG. 5, flanges 6 and 8 to which two shafts 2 and 4 are fixed are connected via an annular multi-layer leaf spring 10 to form a cup. Since the ring has a very high torsional rigidity, it is often used as a connection between a servo motor of a machine tool and a ball screw part. To fix the leaf spring 10, annular spring fixing seats 12 and 14 are arranged on both sides of the leaf spring 10, and a reamer bolt 16 is inserted into the holes of the leaf spring 10 and the spring fixing seats 12 and 14 from the bolt insertion guide hole of the flange 8 on one side. Insert and reamer bolt 16
The nut 18 is screwed in and tightened. As shown in FIG. 5, the spring fixing seats 12 and 14 are formed in a dough-shaped cross section so as to come into contact with the leaf spring 10 at a position close to the outer diameter of the shaft portion of the reamer bolt 16. The spring fixing seats 12 and 14 are shaped to escape with respect to the deformation in the direction.

[0003]

[Problems to be Solved by the Invention] The spring fixing seat 1 described above.
The shapes of 2 and 14 seem to alleviate the force applied to the leaf spring 10 with respect to the angular error of the two axes 2 and 4, but the contact area between the spring fixing seats 12 and 14 and the multilayer leaf spring 10 is Because of its small size, conversely, concentrated stress is generated in the multilayer leaf spring 10 due to the tightening of the reamer bolt 16. Since the leaf spring portion is multi-layered, this method also serves to transmit the torque by the shearing force of the bolt 16 to the leaf spring 10, and the leaf spring portion also includes the spring fixing seat and the leaf spring. It seems that the joint is apparently transmitted by friction (friction), but in reality, it is not completely transmitted by friction and may be transmitted by the shearing force of the reamer bolt to the direct leaf spring hole. Is extremely high. Direct transmission by reamer bolts, that is, when torque is transmitted by shearing force, complete friction transmission, that is, transmission torque and torsional rigidity compared with the case where the flange, spring fixing seat and multilayer leaf spring are integrated by complete friction. It is necessary to expect a performance decrease of 30 to 50% with respect to durability. In other words, it is desirable that the multi-layer leaf spring be frictionally transmitted in terms of joining each member in torque transmission. To remove the above defects,
Even if the contact area of the spring fixing seats 12 and 14 with respect to the leaf spring 10 is increased, the stress due to the biaxial mounting error is concentrated in the arrow portion as shown in FIGS. It may be hastened. The present invention aims to eliminate the above defects.

[0004]

In order to achieve the above object, the present invention arranges an annular leaf spring 24 between a pair of flanges 6 and 8, and a plurality of the pair of flanges 6 and 8 are provided by the tightening force of a bolt. In the device in which the leaf spring 24 is fixed around the bolt insertion hole 20 through the spring fixing seat 28, the shape of the spring fixing seat 28 is such that the spring fixing seat 28 is attached to the plate spring 24. The spring fixing seat 28 fixed to one flange 6 and the spring fixing fixed to the other flange 8 are set so as to overlap in a relatively wide range in the radial direction and the circumferential direction of the leaf spring 24. The side edges a and b of the seat 28 which are adjacent to each other are formed substantially at right angles to the straight line L connecting the fixing portions of the both to the flanges 6 and 8, and the leaf spring of the spring fixing seat 28 is formed. Pair with 24 inner diameter circle And side edge d that, the leaf spring 24
An appropriate escape space e is formed between the inner diameter and the inner circle.

[0005]

When there is an axial displacement between the two shafts to which the pair of flanges 6 and 8 are joined, stress is applied to the leaf spring 24 via the side edges a and b of the spring fixing seat 28, but the side edges a and b. But leaf spring 2
4 is formed at a substantially right angle to the straight line L connecting the fixing portion for one flange 6 and the fixing portion for the other flange 8, and is formed to be relatively long in the radial direction of the leaf spring 24. Since the leaf spring 24 is not subjected to concentrated stress, the leaf spring 24 is uniformly stressed via the side edges a and b, and fatigue of the leaf spring 24 is prevented.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below with reference to the embodiments shown in the accompanying drawings. In FIG. 3, reference numerals 6 and 8 denote flanges, which are provided with a space of 180 degrees and a bolt insertion hole 20 for inserting the reamer bolt 16 and a space of 180 degrees with each other for loosely fitting a nut. A pair of escape holes 22 are transparently provided. The pair of flanges 6 and 8 are arranged to face each other so that the bolt insertion hole 20 and the clearance hole 22 face each other, and the boss portions 6a and 8a are fixed to the two shafts 2 and 4 facing each other by appropriate means. There is. 24
Is a multi-layer leaf spring in which a plurality of leaf springs are superposed, and four holes 26 are provided in the multi-layer leaf spring 24 at intervals of 90 degrees, and the fixed shafts of the flanges 6 and 8 are inserted into the holes, respectively. Hole 2
The shaft portion of the reamer bolt 16 inserted in 0 is inserted. Reference numeral 28 denotes a spring fixing seat that is arranged on both side surfaces of the multilayer leaf spring 24 and is fitted and inserted into the shaft portion of the reamer bolt 16.
The fixing seat 28 is crimped to both side surfaces of the leaf spring 24 by the bolt 16 and the nut 18.

The spring fixing seat 28 is formed in a relatively wide shape, and escapes around the insertion hole 20 of the leaf spring 24, that is, around the fixing portion of the leaf spring 24 in the radial direction and the circumferential direction of the leaf spring 24. They overlap with each other, leaving space e. The escape space e is provided with a notch in a portion of the spring fixing seat 28 that faces the inner diameter circle of the leaf spring 24, and the notch allows the spring fixing seat 28 to have an appropriate interval in the inner diameter circle of the leaf spring 24. Are formed by forming opposite edges d.

Fixed seat 28 fixed to one flange 6
a and a fixed seat 28b fixed to the other flange 8,
The side edges a and b adjacent to each other are set substantially at right angles to the straight line L connecting the centers of the holes 26. The leaf spring 24
A narrowed constricted portion S is formed in the central portion between the fixed portions. In the above-mentioned structure, the second shaft 2 and the fourth shaft 7
When the axial displacement is generated as shown in FIG.
4 is deformed, and by this deformation, stress is generated in the leaf spring 24 along the side edges a and b of the spring fixing seat 28, but this stress is uniformized by the relatively long side edges a and b, and one point Since the concentrated stress does not occur, fatigue of the leaf spring 24 is small.

If the two shafts 2 and 4 have an angle error as shown in FIG. 7B, when the spring fixing seat 28 shown in FIG. 1 is extended until it overlaps with the inner diameter circle of the leaf spring 24, Concentrated stress is generated at the corner C portion of the boundary of the leaf spring 24 with the spring fixing seat 28. This is due to that between the edge d of the spring fixing seat 28 facing the inner diameter circle of the leaf spring 24 and the inner diameter circle of the leaf spring 24. It is solved by the escape space e having an appropriate area. As shown in FIG. 4, the spring fixing seat 3 is inserted into the bolt insertion hole of the multilayer leaf spring 24.
The multi-layer leaf spring 24 may be integrally formed by inserting the tube portion of 0 and the fixed seat 30 and the fixed seat 32 fixed to the tube portion 30a. The shapes of the seat portion of the fixed seat 30 and the fixed seat 32 are the same as the shape of the fixed seat 28 shown in FIG.

[0010]

As described above, according to the present invention, the shape of the spring fixing seat that is in contact with the leaf spring is formed to be relatively wide, and the fixing portion for one flange of the leaf spring and the fixing portion for the other flange are connected to a straight line. Since the opposite side edges of the fixed seat located in the fixed portion are set to be substantially right angles, it is possible to prevent the concentrated stress from being generated in the leaf spring with respect to the axial displacement of the two axes, and the angle of the two axes. The concentrated stress generated in the vicinity of the inner diameter circle of the leaf spring caused by the error can be removed by the escape space formed in the portion.

[Brief description of drawings]

FIG. 1 is a front view of a leaf spring.

FIG. 2 is a partial front view of a leaf spring.

FIG. 3 is a cross-sectional view of a leaf spring coupling.

FIG. 4 is a cross-sectional view of another embodiment of the leaf spring coupling.

FIG. 5 is a sectional view of a conventional method.

FIG. 6 is an explanatory diagram.

FIG. 7 is an explanatory diagram.

[Explanation of symbols]

 2 shafts 4 shafts 6 flanges 8 flanges 10 leaf springs 12 spring fixed seats 14 spring fixed seats 16 reamer bolts 18 nuts 20 bolt insertion holes 22 escape holes 24 leaf springs 26 holes 28 spring fixed seats 30 spring fixed seats 32 spring fixed seats

Claims (1)

[Claims] 1. An annular leaf spring (24) is arranged between a pair of flanges (6) (8), and a plurality of bolt insertion holes (of the pair of flanges (6) (8) are provided by a tightening force of the bolts. 20) In a device in which the leaf spring (24) is fixed to the periphery of the spring fixing seat (28) via a spring fixing seat (28), the shape of the spring fixing seat (28) is such that the spring fixing seat (28) is the plate. The spring fixing seat (28) is set on the spring (24) so as to overlap within a relatively wide range in the radial direction and the circumferential direction of the leaf spring (24) and fixed to one flange (6). ) And the other side edge (a) (b) of the spring fixing seat (28) fixed to the other flange (8), the flange (6) of the both.
The leaf spring (2) of the spring fixing seat (28) is formed at a right angle to a straight line (L) connecting the fixing portions to (8).
4) A leaf spring coupling characterized in that an appropriate clearance space (e) is formed between a circle (d) on the side facing the inner diameter circle of 4) and the inner diameter circle of the leaf spring (24).