JPH0647619Y2 - Oil seal press-fitting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field The present invention relates to a device for press-fitting an oil seal into an annular groove between a shaft and a shaft holder.

(Prior Art) In order to press fit an oil seal into an annular groove formed between a shaft and a shaft holder, it is generally practiced to use the actual method of Sho 61-16673.
A device as disclosed in Japanese Patent Laid-Open No. 1, in which a mechanism for supporting a shaft and a mechanism for press-fitting an oil seal are arranged to face each other on the same axis line so that they can be relatively moved back and forth. It is used, but in the device where the oil seal is fitted to the shaft end of the crankshaft or camshaft of the internal combustion engine, the oil seal is fitted to the internal combustion engine moving on the assembly line from the side. However, if it is not possible to apply the dedicated device as described above, and if there is some deviation in the stop position, the press-fitting type as described above cannot be assembled. It causes problems such as disappearing.

(Problems to be solved by the invention) The present invention has been made in view of such a problem, and an object thereof is to easily and surely press fit the oil seal even if the stop position is slightly displaced. It is to provide a new device that can do this.

(Means for Solving the Problem) That is, the present invention is a press-fitting device for an oil seal for achieving the above-mentioned problem, which is movable in the axial direction and has a hemispherical pressing portion on the inner bottom surface. Inside the tubular support, a tubular oil seal press-fitting member, which is always held on the same axis as the support via a ring-shaped elastic body provided on the front and rear of the peripheral surface, is movably arranged. Inside the oil seal press-fitting member, a center shaft having a cone-shaped tip that engages with a center hole at the tip of the shaft is arranged so as to be slidable in the axial direction with a spring member constantly biased in the protruding direction. It is the one.

(Operation) With this configuration, when the shaft and the oil seal press-fitting member are misaligned with each other, when the center shaft engages with the center hole of the shaft with the cone-shaped tip portion as a guide. Then, the oil seal press-fitting member is displaced so as to be correctly aligned with the axis line of the shaft, and the oil seal is properly press-fitted between the shaft and the holder.

(Example) Then, the Example illustrated below is described.

The drawings show one embodiment of the present invention. A cylinder-shaped piston 4 having an oil seal press-fitting member 8 at its tip is slidably inserted into a cylinder 2 fixed to a frame 1.
This piston 4 has a tip protruding outside the cylinder 2,
A cylindrical support body having a bottom is integrally fixed thereto with a through bolt 6, and a hemispherical head portion 7 of the bolt 6 projects from the inner bottom surface of the support body 5. The oil seal press-fitting member 8 described later is configured to be pressed by 7 so that the shaft can freely move.

On the other hand, the oil seal press-fitting member 8 presses the oil seal w into the annular groove r formed between the cam shaft s and the cam holder h by the pressing surface 8a at the front end. It is formed as a bottomed cylindrical body having an outer diameter much smaller than the inner diameter of the support body 5 so that it can be swung inside, and a pin 9 projecting from a part of its peripheral surface is provided on the peripheral surface of the support body 5. While preventing the falling by engaging with the provided fool hole 5a, the two elastic rings 11, 11 fitted in the respective recessed grooves 10, 10 provided at the front and rear ends of the peripheral surface are provided as a support member. By being brought into contact with the inner peripheral surface of 5, the support 5 is always held on the same axis. A center shaft 13 is slidably mounted inside the press-fitting member 8 while being constantly urged by a spring 14 in a direction in which the center shaft 13 is protruded. Engages with the center hole c of the shaft s to align the press-fitting member 8 with the axis of the shaft s.

In addition, reference numerals 3 and 3 in the figure denote inflow of pressure oil provided in the cylinder 2,
The outflow port 16 is a stopper pin that engages with the long hole 15 provided in the peripheral surface of the center shaft 13 to suppress the escape thereof.

In the device configured as described above, when the internal combustion engine is now sent to the oil seal assembly station and stops at the localization value, the cylinder 2 causes the piston 4 to move by the pressure oil flowing from the port 3 on the right side in the figure. The shaft of the oil seal press-fitting member 8 is projected by engaging the center shaft 13 protruding from the tip of the oil seal press-fitting member 8 with the center hole c provided at the shaft end of the crankshaft or the camshaft s. Correctly align the center with the axis of the shaft s.

By the way, at this time, if there is a slight deviation in the stop position of the internal combustion engine, as shown in FIG. 2, the center shaft 13 is guided by the cone-shaped tip portion 13a and the center hole c. When engaging with, the elastic rings 11, 11 provided on the peripheral surface of the press-fitting member 8 are bent to tilt the press-fitting member 8 with the support body 5, and the axis of the press-fitting member 8 is aligned with the axis of the camshaft s. Therefore, when the piston 4 further advances in this state,
The press-fitting member 8 has its pressing surface 8a properly abutted against the surface of the oil seal w, and the pressing surface 8a causes the oil seal w
Is properly pressed into an annular hole r formed between the cam shaft s and the cam holder h.

(Effects) As described above, according to the present invention, a ring-shaped elastic body at the front and rear of the circumferential surface is provided in a bottomed cylindrical support body that is integral with the piston that slides in the cylinder and that is provided at the tip. An oil seal press-fitting member that is held on the same axis as the support body is movably arranged, and inside the oil seal press-fitting member, a center shaft having a cone-shaped tip that engages with the center hole of the shaft is provided. Since it is arranged, the head body, that is, only the press-fitting member mounted in the support body at the tip can be positioned and displaced with respect to the mounted object while the apparatus main body including the cylinder is fixed. Not only does it eliminate the need for devices that require precise control,
The flexible oil seal held by simply sliding the piston back and forth can be correctly assembled to the mounting position of the mounted object.

[Brief description of drawings]

FIG. 1 is a sectional view showing an oil seal press-fitting apparatus according to an embodiment of the present invention, and FIG. 2 is a sectional view showing the oil seal press-fitting apparatus. 2 ... Cylinder, 4 ... Piston, 5 ... Support, 7 ... Hemispherical head, 8 ... Oil seal press-fitting member, 11 ... Ring elastic body, 13 ... Center shaft, 14 ... Coil spring, s ... Cam Shaft, h ... Cam holder c ... Center hole, w ... Oil seal

Claims (1)

[Scope of utility model registration request] 1. A piston that slides in a cylinder,
In addition, a tubular oil seal press-fitting member, which is always held on the same axis as the above-mentioned support through a ring-shaped elastic body, is movably arranged in a bottomed tubular support provided at the tip end. , Inside the oil seal press-fitting member, the center shaft having a cone-shaped tip so as to engage with the center hole of the mounted member is slidable in the axial direction with a spring member constantly biased in the protruding direction. An oil seal press-fitting device characterized by being provided.