JPH0717474U - Hydraulic puller - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] The stroke length of the ram that pushes the shaft of the hydraulic device (puller) used when attaching and detaching ball bearings to the shaft may be insufficient depending on the position of the bearing on the shaft. Therefore, we will provide a puller with a special jig. [Structure] A socket 5 provided with an inward elastically projecting locking piece is screwed to the tip of the ram 1 of the puller P, and this socket and a compatible leg portion 7 are provided, and a head portion 8 is variously formed. Various types of spacers R with different lengths and thicknesses that can be attached and detached with one touch are available.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hydraulic device, that is, a hydraulic puller used for press-fitting a ball bearing, a pulley or the like into a shaft or removing them from a shaft.

[0002]

[Prior art]

 The above-mentioned hydraulic puller has a shape and usage as shown in FIG. In this figure, P is a hydraulic puller, 1 is a hydraulic cylinder, 2 is a ram, and a hook arm 3 is attached to the head of the hydraulic cylinder in three directions, and the hook arm is locked to the shoulder portion of the ball bearing B or the like. When the ram 2 is pushed out by a hydraulic pump (not shown), the bearing B is pulled out from the shaft S 1. At this time, since the length of the hook arm and the maximum stroke of the ram are determined, the ram may not reach the end of the shaft S even if the ram is fully extended. Therefore, conventionally, in such a case, a method has been adopted in which a rod having an appropriate length and thickness is searched for, and the ram is extruded while being inserted between the tip of the ram and the end of the shaft S.

In the case of the above-mentioned method, it is not possible to find a rod having an appropriate size in the stage where the intended work is performed, or it is possible to prepare rods of various thicknesses and lengths in advance. It was often lost because of the sensation of a stick, and it was dangerous because the stick could suddenly come off during operation due to the strong compressive force.

[0004]

[Problems to be solved by the device]

 Even if the stroke of the ram of the hydraulic puller is not enough, there is no trouble of searching around for the auxiliary rod, and the work can be done safely.

[0005]

[Means for Solving the Problems]

 In the hydraulic puller, a socket that is fixed to the tip of the ram and that has a locking mechanism between it and the other side, and a leg that is fitted to this socket and that has a locking mechanism that engages with the locking mechanism are provided. A plurality of spacers having heads of various thicknesses and lengths to be attached to and detached from the socket were prepared.

[0006]

【Example】

 FIG. 1 shows an embodiment of the present invention. In the figure, P is the main body of the hydraulic puller, 1 is a hydraulic cylinder, 2 is a ram, and 3 is a hook arm attached to the head of the cylinder. Reference numeral 5 is a socket screwed to the tip of the ram 2, and R is a spacer inserted and mounted in this socket. S is a shaft to which the ball bearing B is attached. Now, the bearing B is about to be pulled out of the shaft S to replace the ball bearing. At this time, the position when the ram 2 is most protruded is a and does not reach the end of the shaft S. Therefore, when the spacer R in the figure is attached to the socket 5, the tip of the ram extends to the position b. When the ram 2 is pushed out a little, the tip of the spacer R hits the end of the shaft S and pushes the ram further. The bearing B can be pulled out from the shaft S by taking it out.

FIG. 2 shows a side view of the spacer R and a vertical cross section of the socket 5. In the socket 5, 51 is a female screw that is screwed into the screw 21 at the end of the ram 2, and 52 is a recess of the socket. Reference numeral 4 is a locking piece which is a ball, and a part of which is projected into the recess by the spring 53. Reference numeral 54 is a spring retaining ring screwed to the outer surface of the socket. In the spacer R, 7 is a leg that fits into the recess of the socket 5 with the peripheral groove 6, and when the leg is inserted into the recess 52 of the socket, the ball 4 of the locking piece and the peripheral groove 6 engage with each other. . Reference numeral 8 denotes a head portion of the spacer, which has various thicknesses and lengths, and a non-slip notch is formed on the head surface.

The engagement mechanism between the socket and the spacer is arbitrary, for example, a protrusion is provided in the socket, and the leg of the spacer has an L-shaped groove with an axial groove in which the protrusion can slide and a circumferential groove that follows. Groove may be provided to prevent the spacer leg from coming off by inserting the leg of the spacer into the socket and then slightly turning it, or the leg of the spacer and the spacer may be in a nut-bolt relationship.

[0009]

[Effect of device]

 According to the present invention, since the spacer is attached to the socket fixed to the tip of the ram, it is possible to perform work safely without flying off during use, and the spacer is available in various sizes. Since it is prepared, it can handle many cases and has the appearance as an independent part, so you will be careful not to think of it as a mere stick and store it naturally, so it may be lost. Disappear.

[Brief description of drawings]

FIG. 1 is an overall side view of an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a socket and a side view of a spacer in the above embodiment.

FIG. 3 is a side view of a conventional example in use.

[Explanation of symbols]

 P Puller R Spacer 1 Hydraulic cylinder 2 Ram 3 Hook arm 4 Locking piece 5 Socket 7 Leg 8 Head S S axis B Ball bearing

Claims (4)

[Scope of utility model registration request] 1. A hydraulic puller comprising: a socket fixed to a tip of a ram; and a plurality of spacers having heads of various thicknesses and lengths, which are attached to and detached from the socket. 2. The hydraulic puller according to claim 1, wherein a locking mechanism is provided between the socket and the leg portion of the spacer. 3. The locking mechanism is composed of a locking piece protruding by a spring provided on the side of the socket or the spacer, and a mating peripheral groove that engages with the locking piece. Item 2. The hydraulic puller according to item 2. 4. The locking mechanism comprises a protrusion provided on the socket or spacer side and an L-shaped groove on which the protrusion provided on the mating side is slidable. Hydraulic puller.