JPH0315850Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a retaining ring for a seal that fixes a seal of a ball screw inside a nut.

Generally, a retaining ring for a hole has a groove in the hole, and the retaining ring is inserted into the groove using the spring action of the retaining ring, and the retaining ring itself supports the thrust load in the axial direction with its strong material. It prevents movement. In addition, in order to reduce the contact resistance of the retaining ring (also referred to as a snap spring), the snap ring is formed into a cross-sectional ring and has an outward V on the bottom.
A retaining ring for a thrust washer of a needle bearing having a protruding shape rib is known. (Mr. Kimiaki
(Refer to Publication No. 39-33002) In addition, a stop ring (also referred to as a retaining ring or a snap ring) with a briar insertion opening formed on the open end side has three curved bodies formed on the ring body, and a rotating body is inserted through the curved bodies. It is known that frictional resistance is extremely low because it is in contact with the (Refer to Japanese Utility Model Publication No. 40-24003) However, since the upper and lower surfaces of this retaining ring are flat, it is impossible to prevent the retaining ring from moving in the circumferential direction. When the seal 4 is installed in the open end side step 3 of the inner wall 2 of the nut, in order to prevent movement in the axial direction and the circumferential direction, a tap hole 5 is conventionally formed from the outside of the nut and the seal 4 is aligned with the tap hole 5. A recess 6 is formed on the outer peripheral surface of the seal 4, and then a screw 7 is screwed into the tapped hole 5 to fix the seal.

However, this fixing means cannot prevent the seal 4 from moving in the axial direction, and furthermore, it takes a lot of man-hours to process the taps from the outside after assembly is completed, and the appearance deteriorates as well. This can lead to unfavorable results.

The technical problem of the present invention is to provide a retaining ring that can be inserted into or removed from the circumferential groove of a nut, and that the retaining ring prevents the axial movement of a seal attached to the nut side of the ball screw while at the same time preventing the circumferential movement. It has both anti-slip and anti-fall functions to reliably prevent nuts from slipping, and it is possible to omit processing steps such as tapping nuts.

Additionally, the means for inserting into the groove allows for one-touch assembly.

The structure of the present invention, that is, the technical means for solving the above technical problems, is as follows.

In a retaining ring 10 for a ball screw seal that fixes a ball screw seal inside a nut, the retaining ring 10 is a ring body with a locking part stamped from a steel plate, and the inner diameter part 11 of the ring body is made of synthetic resin or the like. A ball characterized in that a substantially triangular protrusion 12 bent in the axial direction to pierce and fix the side wall of a molded seal 15 is formed on a wave-shaped convex portion of an annular body facing the seal side wall. Retaining ring for screw seals.

In a retaining ring having the above-described structural requirements, the projection on the inner diameter of the retaining ring pierces the side wall of the synthetic resin seal, and one side of the corrugated unevenness presses against the side wall of the circumferential groove formed on the inner wall of the nut. Due to the action of the spring, the opposite side of the wave-shaped unevenness presses against the seal in the axial direction, and when the seal is pierced, it prevents the seal from rotating in the circumferential direction.This device has the unique function of having both an anti-slip function and a preventive function. be.

A preferred example of the present invention will be described below based on the drawings.

Reference numeral 10 denotes a retaining ring stamped and formed from a hardenable spring steel plate, and the inner diameter portion 11 of the retaining ring 10 has approximately triangular projections 12, 12, bent in the axial direction.
is an annular wave-shaped convex portion 1 facing the seal side wall.
3,14.

15 is a stepped portion 17 on the open end side of the inner wall 2 of the nut 1
It is a synthetic resin (tetraferroethylene, nylon, etc.) seal that fits into the seal 15, and a male thread 16 is formed on the inner periphery of the seal 15.

18 is a circumferential groove formed in the inner wall 2 of the nut 1;
The circumferential groove 18 is formed outside the stepped portion 17 on the open end side and in the radial direction.

Holes 19 are formed close to both ends of the retaining ring 10.

For operation, the seal 15 is fitted to the step 17 on the open end side of the inner wall 2 of the nut 1, and then the triangular protrusions 12, 12... of the retaining ring 10 are fitted with the seal 15.
At the same time, one of the wave-shaped irregularities 13 and 14 presses against the side wall of the groove, and the other wave-shaped irregularity presses the end face of the seal.

As a result, the spring action of the C-shaped retaining ring 10 presses the seal against the stepped portion 17 of the nut 1, thereby providing a retaining function and preventing slipping in the circumferential direction that would result in the protrusion biting.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing a known example of means for fixing a seal to a ball screw, Fig. 2 is a front view of a retaining ring for a ball screw seal of the present invention, and Fig. 3 is a cross-sectional view showing a known example of means for fixing a seal to a ball screw. FIG. 10...Retaining ring, 11...Inner diameter portion, 12...Protrusion.

Claims (1)

[Scope of utility model registration request] In a retaining ring 10 for a ball screw seal that fixes a ball screw seal inside a nut, the retaining ring 10 is a ring body with a locking part stamped from a steel plate, and the inner diameter part 11 of the ring body is made of synthetic resin or the like. A ball characterized in that a substantially triangular protrusion 12 bent in the axial direction to pierce and fix the side wall of a molded seal 15 is formed on a wave-shaped convex portion of an annular body facing the seal side wall. Retaining ring for screw seals.