JPS6328738B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a crank gear press-fitting jig used for press-fitting and fixing a crank gear that rotates a camshaft of a valve mechanism to the crankshaft of an internal combustion engine using a press device, and particularly to The present invention relates to an improvement of a positioning device that positions and holds a crank gear on the fixed side of the device.

[Conventional technology and problems]

Conventionally, this type of jig positioning device uses a crank gear that is set horizontally on the fixed side of the press device to position and hold it horizontally using its teeth, and uses a press that descends when press-fitting is complete. The positioning and holding is automatically released, and the direction of positioning and the direction of release are completely different, forming a cross shape, and a complicated link mechanism for changing direction is used, and the structure and The problem was that the operation was complicated and lacked reliability. As a prior art, there is Japanese Patent Publication No. 54-5854. The present invention has been made in view of the above circumstances, and improves the structure and operation of the positioning device by directly releasing the positioning and holding using the lowering of the press without using a link mechanism for changing the direction. It is an object of the present invention to provide a crank gear press-fitting jig that is simplified and has improved operability.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a crank gear cradle for horizontally mounting a crank gear on a fixed side bed plate of a press device, and a crank gear cradle for horizontally mounting a crank gear, and a crank gear cradle for horizontally mounting a crank gear, and a crank gear cradle for horizontally mounting a crank gear. and a positioning device for positioning the crank gear, a clamping device for clamping the crankshaft on the movable side of the press device, and lowering the movable side of the press device, In the device for press-fitting the crank gear into the crankshaft, the positioning device is comprised of a stopper means that is movable up and down, and a positioning pin means that is movable in the radial direction of the crank gear orthogonally to the stopper means. , the positioning pin means is provided with a grip at one end of the positioning pin guide and a stepped hollow cylinder body with the positioning pin guide side closed at the other end, and a movable positioning pin is disposed in the cylinder body. The cylindrical body is supported by a support attached to the stationary base plate of the press device, and a return spring is disposed between the grip and the support, and the stopper means is disposed between a stopper that moves up and down guided by a pilot bar attached to the fixed side baseplate of the press device, and the support body attached to the fixed side baseplate and the stopper. an upward return spring; a chamber in the center of the stopper into which the cylinder of the positioning pin means is inserted; a groove in the lower part of the chamber into which the positioning pin guide is inserted; An edge for regulating the positioning pin means is formed on the upper part of the grip side, and the stopper is lowered to the clamp device provided on the movable side of the press device corresponding to the upper surface of the stopper means. It is configured to include a pusher which releases the positioning pin means from the crank gear to release the positioning and holding.

【Example】

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. In FIGS. 1 to 4,
Reference numeral 1 designates a base plate on the fixed side of the press device 2. A positioning device 3 is provided on this base plate 1, and a crankshaft clamping device 6 is mounted via two vertical pilot bars 5 of a support device 4. The clamp device 6 is mounted so as to be movable up and down, and a push rod 7 on the press side of the press device 2 is attached to this clamp device 6. A crank gear holder 8 is attached to the fixed side base plate 1 of the press device 2,
For example, a balancer gear A and a crank gear B are placed horizontally on this pedestal 8.
A cylinder 9 is vertically connected directly below the pedestal 8,
The core metal 10 is inserted into the crank gear B so as to be moved downward from the fitted state. The crankshaft clamping device 6 has a sliding plate 11 fixed to the pilot bar 5 by a bush 12 and a tightening nut 13 and mounted horizontally, and is guided by the pilot bar 5 to move up and down. , a support plate 1 having a receiving plate 14 attached to this sliding plate 11 and having clamp bolts 15;
6. Clamps 17, 18, etc. are provided to clamp the crankshaft C in a vertical position directly above the crank gear B with the press-fitted portion C' facing down. The push rod 7 on the press punch side is fixed onto the sliding plate 11, and a push metal 27 is provided protruding below the receiving plate 14. The positioning device 3 has a stopper means 19 and a positioning pin means 20 interlocked with each other next to the crank gear B on the base plate 1.
Two pilot bars 21 are vertically attached to the base plate 1, and a stopper 22 is attached to the pilot bars 21.
is installed so as to be movable up and down, and the stopper 22 is prevented from coming off by the head 21' of the pilot bar 21, and is adapted to return upward by urging a spring 23 toward the base plate 1. Further, a chamber 24 having an elliptical cross section is formed in the center of the stopper 22, and a groove 25 having a semicircular cross section is formed below the chamber 24, and at the rear of the upper part of the chamber 24, the positioning pin means 20 is restricted. A protruding edge 26 is provided so that it comes into contact with the pusher 27 and is pressed down just before the press-fitting is completed. On the other hand, in the positioning pin means 20, a cylinder body 29 that can be inserted into the chamber 24 is provided in a stepped manner at one end of the positioning pin guide 28, and a positioning pin 30 is secured in the cylinder body 29 by a pin 31. At the same time, a spring 32 is placed behind the guide 28 for elastic pressure contact, a grip 33 is attached to the other end of the guide 28, and the grip 33 is inserted into the chamber 24 of the stopper 22 horizontally in the radial direction of the crank gear B. Ru. Then, the positioning pin 30 is opposed to fit into the tooth B' of the crank gear B, and the cylindrical body 29 having such a positioning pin 30 is movably supported horizontally by the guide 35 of the support body 34 attached to the base plate 1. A return spring 3 is inserted between the spring receiver 36 of the support body 34 and the grip 33.
7 is provided. Since the present invention is constructed in this manner, first, before press-fitting, the crankshaft C is clamped by the clamping device 6 located above, as shown in FIG. B is placed. Then, in the positioning device 3, the stopper 2
2 is positioned upward, the positioning pin guide 28 is fitted into the groove 25, and the cylindrical body 29 is engaged with the side end surface 22' of the stopper 22 on the crank gear side, so that the positioning pin guide 28 is held forward and the tip is The positioning pin 30 is elastically fitted into the teeth B' of the crank gear B to hold the crank gear B in position. In this way, preparation for press-fitting is completed, and when the crankshaft C is lowered together with the clamp device 6 using the push rod 7 on the press side of the press device 2, the tip C'' of the crankshaft C is first fitted into the core bar 10 and aligned, and then the crankshaft The core metal 10 is connected to the crank gear B at the press-fitted part C' of the shaft C.
At the same time, the press-fitting portion C' comes to be press-fitted into the crank gear B. and,
Just before the press-fitting is completed, as shown in Figure 5 a and b,
When the presser metal 27 on the clamping device side hits the stopper 22 and pushes it down together, the side end surface 22' of the stopper 22 is removed from the cylindrical body 29. Then, the positioning pin guide 28 is moved backward by the spring 37, and a part of the cylinder 29 enters the chamber 24 of the stopper 22 while being restricted by the edge 26, and the positioning pin 30 also separates from the crank gear B and its position. Positioning hold is released. After press-fitting, place the new crank gear on the pedestal 8 again and press the positioning pin guide 28 with the grip 33. When the cylinder 29 comes out of the chamber 24 of the stopper 22, as shown in FIG. 22 becomes free and moves upward by the spring 23. Then, as described above, the positioning pin guide 28 is automatically moved forward and held, and the positioning pin 30 is used to position and hold the crank gear.

【Effect of the invention】

As described above, according to the present invention, the positioning device 3 is composed of the stopper means 19 and the positioning pin means 20 provided horizontally intersecting therewith, and there is no link mechanism for changing the direction, so the structure is simplified.
Works well too. In addition, the positioning and holding of the crank gear B is reliably released immediately before the press-fitting is completed, and by pushing the grip 33, it is easily and reliably returned to the set state and held in position.

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of the jig according to the present invention, FIG. 2 is a side view of the same, FIG. 3 is a plan view of main parts, FIG. Figure a,
b and FIG. 6 are diagrams showing the operating state. B...Crank gear, C...Crankshaft, 2...
... Press device, 3 ... Positioning device, 6 ... Clamp device, 19 ... Stopper means, 20 ... Positioning pin means, 22 ... Stopper, 23 ... Spring for upward return, 27 ... Pusher, 28 ... Positioning pin guide, 30... Positioning pin, 33...
...Grip, 37...Return spring.

Claims (1)

[Scope of Claims] 1. A crank gear cradle on which a crank gear is placed horizontally on a fixed side base plate of a press device, and a crank gear cradle on which a crank gear is placed adjacent to the crank gear cradle in the radial direction of the crank gear. A positioning device for positioning the gear is provided, a clamping device for clamping the crankshaft is provided on the movable side of the press device, and the movable side of the press device is lowered to clamp the crankshaft. In the device for press-fitting the crank gear, the positioning device includes a stopper means that can move up and down, and a positioning pin means that can move in the radial direction of the crank gear orthogonally to the stopper means, and the positioning pin The means is provided with a grip at one end of the positioning pin guide and a stepped hollow cylinder body with the positioning pin guide side closed at the other end,
A movable positioning pin is disposed on the cylindrical body, the cylindrical body is supported by a support attached to the stationary base plate of the press device, and a return pin is provided between the grip and the support. The stopper means includes a stopper that moves up and down guided by a pilot bar attached to the fixed side base plate of the press device, and a stopper that is attached to the stopper and the fixed side base plate. an upward return spring disposed between the stopper and the support body; a chamber in the center of the stopper through which the cylindrical body of the positioning pin means is inserted; a groove through which the positioning pin guide is inserted, and an edge for regulating the positioning pin means in the upper part of the grip side of the chamber, and provided on the movable side of the press device corresponding to the upper surface of the stopper means. To the above clamp device,
A crank gear press-fitting jig, characterized in that it is provided with a pusher that lowers the stopper to separate the positioning pin means from the crank gear and release the positioning hold.