JPH0318056B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rolling bearing for linear motion in which a bearing member fitted so as to straddle an elongated rail member moves relative to the rail member. Specifically, the present invention relates to a stopper device that is attached to a rail member to prevent the bearing member from separating from the rail member.

Prior Art As a prior art related to the present invention,
There is number 112722. The stopper shown here is formed by forming a pair of flanges on the inside of a thick portal-shaped member (made of synthetic resin), which are fitted into the raceway grooves of the track base.

With this technology, it is not possible to apply the adhesion force to the rail member at the flange part that contacts the raceway groove (because the wall is thick in the longitudinal direction, increasing the preload during assembly will make it difficult to assemble the stopper device). (If the preload is reduced, the stopper will lose its separation prevention function. There is no choice but to adopt a method of forming a slit and fitting a part of the stopper into this slit to increase the fixing force with the track base.

Problems to be Solved by the Invention As described above, the conventional stopper device cannot prevent the casing from separating by using the raceway groove portion of the rail member with the highest dimensional accuracy. We have to reinforce that. For example:

As in Japanese Utility Model Publication No. 112722/1983, a slit is formed perpendicularly to the raceway groove of the rail member and is fitted into the slit.

This is made by using a mounting hole formed in the rail and fitting a part of the stopper into this hole.

A dowel pin is installed near the end of the rail, and this serves as a stopper.

These conventional techniques are difficult to use because (a) post-processing is required on the rail, (b) the stopper cannot be attached to an arbitrary position on the rail, and (c) removal is troublesome. It wasn't easy. Furthermore, the stopper device itself has a complicated shape and is expensive.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an inexpensive stopper device that overcomes the drawbacks of the prior art, has a simple structure, is easy to assemble and remove, and has a large adhesion force to the rail.

Means for Solving the Problems The stopper device for a linear motion rolling bearing of the present invention has the following configuration as a means for solving the above problems.

(1) In a linear motion rolling bearing in which a long rail member and a bearing member spanning the rail move linearly via rolling elements inserted between raceway grooves formed in the two members, the Γ rail member A gate-shaped stopper made of thin-walled steel plate with high elasticity is fixed near the end face of the Γ stopper. The Γ stopper consists of a horizontal part and sleeve parts formed at both ends. Inside the Γ sleeve part, there is a rail member. (2) In the stopper of (1) above, at least one of the lower surfaces of the Γ horizontal part is provided with at least one pair of fitting protrusions that are press-fitted and fitted into the raceway groove portion of the stopper, and that prevents the stopper from falling. (3) In the stopper of (2) above, fall prevention protrusions are formed in both directions on the lower surface of the horizontal part, and at least the One tip is formed into an arc shape to act as a shock absorber in the event of a collision with a bearing member; (4) In the stopper of (2) above, there are protrusions to prevent falling in both directions on the lower surface of the Γ horizontal part. (5) In the stopper of (2) above, Γ is formed on the upper surface of the horizontal part, and a shock absorber is formed that protrudes farther than the anti-falling protrusion and has an arcuate tip. A pair of shock absorbers, in which anti-falling protrusions are formed in both directions on the lower surface of the horizontal part, and protrude farther than the anti-falling protrusions in a portion other than the fitting protrusion of the Γ sleeve part, and the tips thereof are formed in an arc shape. Since the stopper device of the present invention is made of a thin steel plate and has high elasticity, it can be fixed to any location on the rail and can be easily removed from the rail.

Embodiment FIGS. 1 and 2 show a first example of carrying out the present invention. In FIG. 1, the stopper 1 is connected to the rail member 2.
FIG. The stopper 1 is made of a highly elastic thin steel plate and has a gate shape. Sleeve portions 1b are formed at both ends of the horizontal portion 1a, and a fitting protrusion 1c that press-fits into the raceway groove 2a of the rail 2 is formed on a part of the inside of the sleeve portion 1b. The sleeve portion 1b other than the fitting protrusion has a gap with the rail so that it does not come into contact with the rail. The dimension between the pair of fitting protrusions is narrower than the dimension between the track grooves of the rail, so when the stopper is fitted to the rail, the entire stopper is elastically deformed in an arched manner, and the fitting protrusion 1c and the horizontal part 1a are It has a V-shape with the sleeve portion 1b as a fulcrum, and the pair of fitting protrusions are fixed to the rail so as to be sandwiched in a wedge shape. Therefore, even if the bearing member 3 collides with the stopper 1, the fixing force with the rail does not decrease until the direction of curvature of the horizontal portion 1a is reversed due to the elastic force of the stopper.

FIG. 3 is a perspective view showing a second example of implementation. 1st
The ideal of the implementation order is for the stopper and the rail to be fixed together so that the parts other than the fitting protrusion 1c do not come into contact with the rail, but in reality, the entire stopper is attached to the rail using the two fitting protrusions as fulcrums. It makes a rocking motion back and forth. In the second embodiment, a collapse prevention protrusion 1d is formed to prevent this.

FIG. 4 is a perspective view showing a third embodiment. In this case, fall-preventing protrusions 1d are formed at the front and rear of the horizontal portion, and the stopper is almost prevented from falling with respect to the rail. Even in the case of the third embodiment, assembly and removal can be facilitated by forming a slight gap between the lower surface of the anti-collapsing projection 1d and the upper surface of the rail.

In the embodiments shown in FIGS. 5 to 7, the collapse prevention protrusion 1
In addition to d, in order to prevent damage to the sealing device or shield device provided at both ends of the bearing member when the bearing member and the stopper collide, the tip of the protrusion is located further away than the tip of the anti-falling protrusion. Figure 3 shows an embodiment with a formed shock absorber.

FIG. 5 is a perspective view showing a fourth embodiment of the shock absorbing device 1 in which the tips of the anti-collapsing protrusions are formed in an arc shape so as to come into contact with parts other than the sealing device.
e, which is the simplest structure, generates a strong fixing force because it converts the force that tries to pull out into a moment load, and can be manufactured at low cost.

FIG. 6 is a perspective view showing the fifth embodiment, in which the shock absorber 1e is formed by bending a protrusion formed on the upper surface of the horizontal part at a right angle, and further bending the tip at a right angle, and is similar to the fourth embodiment. Similarly, a strong adhesion force can be obtained.

FIG. 7 is a perspective view showing the sixth embodiment, in which the fifth embodiment has a buffer member formed on the outer surface of the stopper and is bent inward to form a shock absorbing device, whereas the sixth embodiment In an example, a shock absorbing member is formed on the inner surface of a stopper, and this is bent outward to form a shock absorbing device 1e. Although the shock absorbing device can be formed on the outside of the sleeve, the sixth embodiment is more economical because the material area of the stopper is smaller.

FIG. 8 is a perspective view showing a seventh example of implementation. While the previous examples use balls as rolling elements, this example uses rollers as rolling elements, and the only difference is the shape of the fitting protrusion 1e, and the other parts are the first
Same as the example. Note that the shape of the fitting protrusion does not need to match the raceway groove 2a formed in the rail of the bearing, and may be a V-shaped raceway groove or an arcuate fitting protrusion.

FIG. 9A is a sectional view of a target bearing in which the stopper shown in FIGS. 1 to 8 can be used. The stopper can be press-fitted and fixed at any position on the rail as shown in FIG. 1, but in practical terms it is fixed to the raceway groove portion where it does not come into contact with balls etc. during bearing operation.

FIG. 9B is a front view of the first embodiment. In order to press fit the stopper 1 into the rail, the distance L between the track grooves of the rail is generally made larger than the distance l between the fitting protrusions of the stopper 1, but the relationship between L and l is determined as shown in Fig. 9C. It is also possible to protect the orbital contact surface with the ball 4 by reversing this. In C, L<l is set, and the rolling elements and the rail are brought into contact while avoiding the contact surface, so as not to damage the raceway surface.

FIG. 10 is a front view of the eighth embodiment after the stopper and rail are assembled. The track groove portion of the rail is an inclined surface.

FIG. 11 is a front view showing the ninth embodiment. Conventional bearings had a total of two rows of rolling element rows, but this row has a total of four rows of raceway grooves. In addition, if the bearing member is lightweight,
In the case of small bearings, the fixing force is not particularly necessary, so it is also possible to use the conventional stopper for two rows by using only the upper raceway groove of the four rows.

FIG. 12 is a perspective view of a bearing that belongs to the technical field of the present invention. The stopper of the present invention can be easily implemented even in a type of bearing in which the rail raceway grooves face each other in a U-shaped cross-sectional groove formed in the side wall. It is also possible to fix the fitting protrusion to the U-shaped groove formed in the side wall without bringing the fitting protrusion of the stopper into contact with the raceway groove.

Effects of the invention (1) Since it is made of thin steel plate, press working is possible and mass production is possible.

(2) The rail stopper is easy to assemble and can be fixed to any location on the rail.

(3) It is easy to remove from the rail and can be reused even after removal.

(4) It can be manufactured at low cost.

[Brief explanation of the drawing]

1 and 2 are drawings showing a first example of implementation of the present invention,
Figures 3, 4, 5, 6, 7, and 8 are drawings showing examples 2, 3, 4, 5, 6, and 7, respectively, and Figure 9 A, B, and C are two examples of the fitted state of the stopper. FIGS. 10 and 11 are drawings showing the eighth and ninth embodiments, respectively, and FIG. 12 is a drawing of a bearing that belongs to the technical field of the present invention. The symbols in the drawings indicate the following members, respectively. 1: Stopper, 2: Rail member, 1a: Horizontal part, 1b: Sleeve part, 1c: Fitting protrusion, 1d: Falling prevention protrusion, 1e: Shock absorber, 2a: Raceway groove,
3: Bearing member.

Claims (1)

[Claims] 1. A rolling bearing for linear motion in which an elongated rail member and a bearing member spanning the rail member move linearly via rolling elements inserted between raceway grooves formed in these two members. In the above, a gate-shaped stopper made of a thin steel plate with high elasticity is fixed near the end face of the rail member, and the stopper consists of a horizontal part and sleeve parts formed at both ends of the horizontal part, and the inner side of the sleeve part A stopper device for a rolling bearing for linear motion, characterized in that at least one pair of fitting protrusions are formed to be press-fitted into the raceway groove portion of the rail member. 2. Claim 1, characterized in that at least one of the lower surfaces of the horizontal portion of the stopper is formed with a fall prevention protrusion bent in an L-shape to prevent the stopper from falling. A stopper device for the rolling bearing for linear motion described above. 3. Fall prevention protrusions are formed in both directions on the lower surface of the horizontal part of the stopper, and at least one tip thereof is formed in an arc shape to serve as a shock absorber in the event of a collision with a bearing member. A stopper device for a rolling bearing for linear motion according to claim 2. 4 Anti-collapse protrusions are formed in both directions on the lower surface of the horizontal part of the stopper, and a shock absorber is formed on the upper surface of the horizontal part, the shock absorber protruding further than the anti-collapse protrusions and having an arcuate tip. A stopper device for a rolling bearing for linear motion according to claim 2, characterized in that: 5. Anti-fall protrusions are formed in both directions on the lower surface of the horizontal part of the stopper, and protrude farther than the anti-fall protrusions in a portion other than the fitting protrusion of the sleeve part, and the distal end is formed in an arc shape. A stopper device for a rolling bearing for linear motion according to claim 1 or 2, characterized in that a pair of shock absorbers are formed.