JPH04136566A - Shaft seal rubber seal bellows and manufacture thereof - Google Patents

Abstract

PURPOSE:To protect the sliding part between a piston rod and guide member by engaging a head with the head of the piston rod, fixing a skirt part to the guide member, and using a bellows forming recessed grooves, which are slidable to the piston rod, for a body part. CONSTITUTION:The bore of the body part 2 of a straight tube 1 is slidably engaged with a piston rod 3, and the length is determined corresponding to the full stroke of the piston rod 3. The head part 4 is engaged with the head of the piston rod 3, and the skirt part 5 of the body part 2 to the guide member 6 to which the piston rod 3 is slidably secured. A plurality of recessed grooves 7 having large R are formed in the inside surface of the body part 2 of the straight tube 1. The insertion of the piston rod 3 in the body part 2 and the appliance of pressure to the head 4 form a bellows automatically. Since this is not to make a bellows itself but to make a rubber seal straight tube automatically becoming a bellows, a bellow can be obtained at an extremely low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a rubber seal bellows configured as a straight tube that can be mass-produced and automatically becomes bellows when set in a target actuator.

The rubber seal bellows straight tube of the present invention has its top end fixed to the tip of a piston rod, its skirt part fixed to a guide member on which the piston rod is slidably attached, and its body part fixed to the piston rod. Constructed as a straight tube that slidably engages the rod and whose length is determined to correspond to the entire stroke of the piston rod.

When this straight tube is set in the target actuator, the body is compressed and automatically becomes a bellows, and thereafter expands and contracts repeatedly as a bellows in response to the stroke of the piston rod.

In this case, if the inner diameter of the body can slide freely on the piston rod, and if the length, wall thickness, and hardness are the same, compressing it will automatically form a bellows with the same outer diameter and the same number of steps. be done. However, in this case, it is inevitable that the shape will be somewhat irregular.

Therefore, grooves or ribs are provided in the body to guide the bellows to be formed correctly.

A required number of concave grooves are formed on the inner circumferential surface of the body, and these grooves are set in the target actuator. Each of the thin grooves first swells and the bellows are automatically formed correctly.

Further, a required number of convex ribs may be formed on the inner circumferential surface of the body. When this is set in the actuator, the central portion between the thick protrusions on the body section first bulges, automatically forming a bellows correctly.

Furthermore, similar results can be obtained by forming a required number of convex ribs on the outer peripheral surface of the body.

Since the present invention does not make the bellows itself, but instead makes a rubber-sealed straight tube that becomes the bellows, it is extremely easy to make molds, and a large number of these molds are attached to a molding machine and a large number of molds are formed at once. Bellows can be obtained at an extremely low cost.

The conventional method of creating the exact shape of the bellows from the beginning is difficult and extremely expensive.

The object of the invention is to obtain a low cost rubber seal bellows.

Examples of the present invention will be described below.

1, 2, 3 and 4 each show a cross-sectional view of a rubber-sealed straight tube 1. FIG. The inner diameter of the body 2 of each straight tube 1 slidably engages a piston rod 3, the length of which corresponds to the full stroke of the piston rod 3, and the top end 4 of which At the tip of 3.

The skirt portions 5 each engage a guide member 6 on which the piston rod 3 is slidably mounted (FIG. 5).

Figure 1 shows the basic rubber seal straight pipe.

2 shows a case in which a plurality of concave grooves 7 are formed on the inner surface of the body section 2, FIG. 3 shows a case in which a plurality of convex ribs 8 are formed on the inner surface of the body section 2, and FIG. A plurality of convex ribs 8 are formed on the outer surface.

In either case, insert the piston rod 3 and straight tube 1.
When pressure is applied to the top end of the bellows, it automatically becomes bellows (Figure 5).

FIG. 6 shows a single-cavity mold unit for the rubber seal straight tube shown in FIG. 2. Reference numeral 69 indicates the female mold, lO the male mold, and +1 the raw material injection port.

These single-cavity mold units are separated into male and female units and mounted in large numbers on the mold plate of a molding machine, which is heated to high temperatures.

The mold is clamped under high pressure and the raw material is injected into the mold, -
All at once, they were mass-produced.

The above is a general method for manufacturing the rubber seal straight tube for bellows according to the present invention.

The rubber seal straight tube for empty and hydraulic cylinders will be explained below.

Figure 7 shows the basic rubber seal straight pipe.

8 shows a case in which a plurality of concave grooves 7 are formed on the inside surface of the body section 2, FIG. 9 shows a case in which a plurality of convex ribs 8 are formed on the inside surface of the body section 2, and FIG. A plurality of convex ribs 8 are formed on the outer surface. FIG. 11 shows an example of a mold unit for forming the rubber seal straight tube 1.

In order to insert the skirt portion 5 of the rubber seal straight tube 1 into the seal pocket 13 formed on the end face of the cap screw 12 (FIG. 12), define the outside of the seal pocket portion 13 as shown in FIG. The rubber seal straight tube 1 is fixed to the cap screw 12 by applying hydraulic pressure.

FIG. 14 shows the cap screw 12 with a straight tube attached to an empty hydraulic cylinder. The convex rib 14 on the inner surface of the straight tube 1 corresponds to the concave groove 15 of the piston rod 3.
and inserts the retainer 16 to prevent its separation;
The retainer 16 is fixed with a snap ring 17. The protruding ribs 18 are used for positioning the retainer 16. Figure 15 shows the state in which the rubber seal straight tube 1 becomes bellows as it is pulled by the piston rod.

[Brief explanation of drawings]

Figures 1, 2, 3, and 4 are cross-sectional views of the rubber-sealed straight tube, Figure 5 shows the straight tube in a bellows state, and Figure 6 shows the molded metal of the straight tube. Mold unit, Fig. 7, Fig. 8, Fig. 9, and Fig. 1θ are empty; Fig. 11 is a cross-sectional view of a rubber seal straight pipe for a hydraulic cylinder; Fig. 11 is a mold unit for forming the straight pipe; Figure 13 shows the process of inserting and crimping the skirt portion of the rubber seal straight tube into the seal pocket of the cap screw, and Figure 14 shows the rubber seal straight tube empty and installed in the hydraulic cylinder. , FIG. 15 shows the state in which the rubber-sealed straight tube becomes bellows as it is pulled by the piston rod. 1,...Rubber seal straight tube 2,...Body portion 3 of the rubber seal straight tube,...Piston rod 4,...Top end portion 5 of the rubber seal straight tube,... ...Rubber seal straight pipe skirt portion 6, ...Guide member 7, ...Concave groove 8, ...Convex rib +2. ...Cap screw 13 ...Seal pocket Fig. 1 Fig. 2 Fig. 3 Fig. 4

Claims (1)

[Claims] 1. Its top end is fixed to the tip of the piston rod, its skirt part is fixed to a guide member on which the piston rod is slidably attached, and its body part is fixed to the piston rod so as to be slidable thereon. A shaft-sealing rubber seal bellows that is movable and configured as a straight tube whose length is determined in accordance with the entire stroke of a piston rod. 2. Its top end is fixed to the tip of the piston rod, its skirt part is fixed to the guide member on which the piston rod is slidably attached, and its body part is slidable on the piston rod, and A shaft sealing rubber characterized in that it is constructed as a straight tube having a length determined corresponding to the entire stroke of the piston rod, and a required number of concave grooves are formed on the inner circumferential surface of the body of the straight tube. Seal bellows. 3. Its top end is fixed to the tip of the piston rod, its skirt part is fixed to the guide member on which the piston rod is slidably attached, and its body part is slidable on the piston rod, and A shaft-sealing rubber characterized in that it is constructed as a straight tube with a required number of convex ribs formed on the inner peripheral surface of the body of the straight tube, the length of which is determined according to the entire stroke of the piston rod. Seal bellows. 4. Its top end is fixed to the tip of the piston rod, its skirt part is fixed to the guide member to which the piston rod is slidably mounted, and its body part is slidable on the piston rod, and A shaft-sealing rubber seal characterized in that it is configured as a straight tube with a required number of convex ribs formed on the outer peripheral surface of the body of the straight tube, the length of which is determined according to the entire stroke of the piston rod. bellows. 5. Rubber seal A seal in which the inner surface of the tip of the straight tube engages with the tip of the piston rod, and the skirt portion of the straight tube is formed on the end surface of the cap screw that slidably engages the piston rod.・A rubber seal mechanism for sealing the shaft of air and hydraulic cylinders, which is inserted into a pocket and fixed by crimping. 6. Engage the convex rib on the inner surface of the tip of the rubber seal straight tube with the concave groove of the piston rod, insert the retainer to prevent the straight tube from coming off the piston rod, and then attach the snap ring. A shaft-sealing rubber seal mechanism for air and hydraulic cylinders, which is characterized by fixing the tip of a straight tube to a piston rod through a rubber seal mechanism.