JPH0715234U - Press-fitting punch for oil seal press-fitting machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a press-fitting punch capable of reducing the outer diameter of the press-fitting punch, preventing galling of the oil seal, and ensuring a sufficient holding force of the oil seal. [Structure] An annular groove 13 is provided on an outer peripheral surface 14 of a press-fitting punch 5, and a lip 11 of an oil seal 8 is fitted into the annular groove 13 so that the press-fitting punch 5 holds the oil seal 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a press fit punch of an oil seal press fit machine for press fitting an oil seal.

[0002]

[Prior art]

 Conventionally, there is an oil seal press-fitting machine shown in FIG. The oil seal press-fitting machine 1 comprises a jig 2 for fixing and positioning a work and a press-fitting ram 4 for press-fitting an oil seal 8. The workpiece 6 shown in the figure shows the case of the transmission, and has a cylindrical boss portion 7 through which the output shaft of the transmission penetrates at the center, and the inlet 9 of this boss portion 7 connects the case and the output shaft. An oil seal 8 for sealing the space is attached. In this mounting method, first, the boss portion 7 of the work is inserted into the positioning hole 3 of the jig 2, and the work 6 is positioned so that the press-fitting punch 5 mounted on the press-fitting ram 4 and the boss portion 7 are concentric. To do. Next, the oil seal 8 is attached to the press-fitting punch 5 having a diameter larger than the inner diameter of the oil seal 8, the press-fitting ram 4 is lowered, and the oil seal 8 is press-fitted into the boss inlet 9. After that, the press-fitting ram 4 is raised, the press-fitting punch 5 is removed, and the attachment of the oil seal 8 is completed.

[0003]

[Problems to be solved by the device]

 By the way, in the conventional oil seal press-fitting machine 1, as shown in FIG. 3, the oil seal 8 is inserted into the press-fitting punch 5 having a diameter larger than the inner diameter of the oil seal 8, and the oil seal 8 is held by the tightening force of the oil seal 8. However, in the method of holding the oil seal 8 as described above, when the centers of the press-fitting punch 5 and the boss inlet 9 are displaced, the oil on the side where the center of the press-fitting punch 5 and the center of the boss inlet 9 are close to each other. Since the seal 8 is strongly pressed against the press-fitting punch 5, the sliding resistance is large when the press-fitting punch 5 is removed, and the oil seal 8 is scratched (linear scratches), which causes a defect. In order to prevent galling, the outer diameter of the press-fitting punch 5 may be made smaller, but if the outer diameter is made smaller, the holding force of the oil seal 8 becomes smaller and the oil seal 8 may fall off. The present invention was developed in view of the above problems, and its purpose is to provide a press-fitting punch that can secure a sufficient holding force of an oil seal while reducing the outer diameter of the press-fitting punch. To provide.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a press-fitting punch of an oil seal press-fitting machine in which an oil seal is press-fitted with an annular groove for holding an oil seal in a press-fitting punch having a diameter larger than the inner diameter of the oil seal. Is characterized by.

[0005]

[Action]

 According to the present invention, since the oil seal is held by fitting the oil seal into the groove provided in the press-fitting punch, the oil seal can be reliably held even if the outer diameter of the press-fitting punch is reduced. The outer diameter can be made smaller than that of the conventional press-fitting punch. Therefore, it is possible to prevent the galling of the oil seal.

[0006]

【Example】

 Hereinafter, the press-fitting punch according to the present invention will be described with reference to examples. FIG. 1 is a view showing a state in which an oil seal is attached to a press-fitting punch according to the present invention. The same components as those in the conventional technique are designated by the same reference numerals. A cylindrical press-fitting punch 5 is provided at the tip of the press-fitting ram 4, and a V-shaped annular shape is formed on the outer peripheral surface 14 of the press-fitting punch 5 along which a lip 11 of an oil seal 8 described later fits. A groove 13 is provided. Also, the outer diameter of the press-fitting punch 5 is smaller than that of the conventional one, and the tip is tapered so that the oil seal 8 can be easily attached. The inclination angle of the annular groove 13 is set so that the lower slope 13b is gentler than the upper slope 13a. The oil seal 8 has a substantially U-shaped cross section as shown in FIG. 1, and has a substantially L-shaped base 10, a lip 11 extending from the tip of the base 10, and a core material 12 for preventing settling of the lip 11. Consists of. When the oil seal 8 is fitted into the press-fitting punch 5, the lip 11 of the oil seal 8 fits into the annular groove 13, and the oil seal 8 is held by the press-fitting punch 5 in the state shown in FIG. In this state, the press-fitting ram 4 is lowered and the oil seal 8 is press-fitted into the boss inlet 9 of the case 6. After that, when the press-fitting ram 4 is raised, the lip 11 is separated from the annular groove 13 of the press-fitting punch 5, and the oil seal 8 is attached to the boss inlet 9. At this time, even if the centers of the press-fitting punch 5 and the boss portion 7 are deviated from each other, the lip 11 slides on the outer peripheral surface 14 of the press-fitting punch 5 after the lip 11 is disengaged from the annular groove 13, but Since the outer diameter of is small, sliding resistance is small and galling does not occur. Further, the inclination angle of the annular groove 13 is set so that the lower slope 13b is gentle with respect to the upper slope 13a, so that the lip 11 is separated from the annular groove 13 when the oil seal 8 is press-fitted. The oil seal 8 is easily detached when the press-fitting punch 5 is pulled out.

[0007]

[Effect of device]

 According to the present invention, the press-fitting punch is provided with the annular groove, and the oil seal is retained by fitting the oil seal into the annular groove. Therefore, the outer diameter can be made smaller than that of the conventional press-fitting punch, and the oil seal can be easily adjusted. Can be prevented.

[Brief description of drawings]

FIG. 1 is a view showing a state in which an oil seal is attached to a press-fitting punch according to the present invention.

FIG. 2 is a view showing an oil seal press-fitting machine.

FIG. 3 is a view showing a state in which an oil seal is attached to a conventional press-fitting punch.

[Explanation of symbols]

 1 Oil seal press-fitting machine 5 Press-fitting punch 8 Oil seal 13 Annular groove 14 Outer peripheral surface

Claims (1)

[Scope of utility model registration request] 1. A press-fitting punch of an oil-seal press-fitting machine for press-fitting an oil seal, wherein a press-fitting punch having a diameter larger than the inner diameter of the oil seal is provided with an annular groove for holding the oil seal. Press-fit punch.