JPS6320511Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a press-fitting tool for ring-shaped parts.

Generally, in order to press-fit a ring-shaped part such as a valve seat into the cylinder head of an engine, a pin is supported in a plurality of vertical guide grooves formed in a hollow shaft-shaped press-fitting tool body and extending in the axial direction so as to be freely rotatable in the radial direction. A chuck claw is provided, a rod is slidably inserted into the hollow part of the press fitting tool body, the rod is moved forward and backward, the chuck claw is opened and operated to chuck the valve seat, and the press fitting tool is inserted with the same diameter as the valve seat. Press-fitting is carried out by applying pressure with a receiver formed from a part of the main body, and when press-fitting valve seats of different diameters, that is, when cylinder heads of different sizes are conveyed in a mixed flow, pressurization is required. In order to secure the area, a separate press-fitting tool with a different diameter of the receiving metal was required, and replacing the tool was time-consuming.

In addition, in order to solve the above problem, it is possible to increase the diameter of the receiver and secure the pressurizing area even with different diameters, and press-fit with one press-fitting tool.
If the diameter is simply increased, problems such as interference will occur when the holder interferes with the cylinder head when a small diameter valve seat is press-fitted.

The present invention is intended to solve this problem.The shaft-like body has a plurality of vertical guide grooves cut in the radial direction near the tip and extends in the axial direction, and a plurality of vertical guide grooves that are perpendicular to the longitudinal guide grooves and cut in the tip. A chuck member is provided in each of the vertical guide grooves of the press fitting tool body having a horizontal guide groove formed in a concave shape in the radial direction on the outer periphery, and is supported so as to be movable in the radial direction and holds the ring-shaped part by an opening operation; The chuck members are located outside of each chuck member in a number corresponding to the number of chuck members, and are mounted in the horizontal guide groove so as to be able to come into contact with each chuck member and move freely in the radial direction by the opening operation of each chuck member. When each chuck member opens and holds the ring-shaped part, a part of the receiver protrudes from the horizontal guide groove, and when each chuck member opens and holds the ring-shaped part, the receiver The part protruding from the groove has a pressure surface for pressurizing the ring-shaped part during press-fitting, and has an outer peripheral shape such that the outer peripheral surface is located at approximately the same position as the outer peripheral surface of the ring-shaped part, and around the outer edge of the receiver. An annular elastic body is provided to urge the receiver inward in the radial direction, and the chuck member is moved and the ring-shaped part is held by a drive member provided in the press fitting tool body that moves the chuck member at least radially outward. At the same time, multiple holders are opened and closed according to the diameter of the ring-shaped part. In other words, by moving the holders according to the diameter of the ring-shaped part, a pressurizing area is secured and a single press-fitting tool is used. This allows ring-shaped parts with different diameters to be press-fitted and prevents the receiver from interfering with the workpiece.

The present invention will be described in detail below based on embodiments shown in the drawings.

In the figure, reference numeral 1 denotes a press-fitting device, which is rotatably supported by a frame 3 via a shaft 2. A press fitting tool 4 is attached to the lower end and moves forward and backward by the operation of the first cylinder 5.

Reference numeral 6 denotes a second cylinder, and a rod 7 is connected to the press-fitting device 1, so that the press-fitting device 1 swings about the shaft 2 by the operation of the second cylinder 6.

Reference numeral 8 denotes a cylinder head, which is conveyed by a conveyor (not shown) and when it reaches the press-fitting position a, a clamping device 9 is activated and the cylinder head is fixed.

10 is a valve seat conveyance path and the third cylinder 11
The valve seat 12 is moved to the set position b.

In FIGS. 2 and 3, reference numeral 13 denotes a hollow shaft-shaped press-fitting tool body, and a tapered portion 13b is formed at the tip of the large diameter portion 13, and a small diameter portion 13c into which the valve seat 12 can be inserted is formed at the tip of the tapered portion 13b. ing.

As shown in FIG. 4, this press-fitting tool main body 13 has three vertical notches cut in the radial direction, penetrating the hollow portion 13d, and extending in the axial direction across the large diameter portion 13a, the tapered portion 13b, and the small diameter portion 13c. Guide grooves 14, 14,
14 are formed at equal intervals in the circumferential direction, and within the three vertical guide grooves 14, 14, 14, the press fitting tool main body 13 is formed.
The pin 1 has a protrusion 15a that protrudes into the hollow portion 13d and a portion 15b that extends toward the small diameter portion 13c.
A radially movable chuck pawl 15 supported by 6 is mounted on each side.

Also, as shown in FIG. 4, the tip of the tapered portion 13b of the press-fitting tool main body 13 is notched in the tangential direction perpendicular to each of the three vertical guide grooves 14, 14, 14, and the horizontal guide groove 17, 17, 17 are formed.

Reference numeral 18 is a receiver, and the horizontal guide grooves 17, 17,
17, the chuck pawls 15 are located outside the chuck pawls 15, and are movable in the radial direction by the opening and closing operations of the chuck pawls 15. As shown in FIG. The chuck claws 15 are arranged in a number corresponding to the number of chucks 15 (three) so that each chuck claw 15 reliably moves in the radial direction. Also,
When each chuck pawl 15 opens and holds the valve seat 12, which is a ring-shaped component, a portion of this receiver 18 protrudes from the horizontal guide groove 17, and when the valve seat 12 is press-fitted into the cylinder head 8, the valve seat 18 is inserted into the cylinder head 8. It has a pressure surface 18c that pressurizes the seat 12, and also has a chuck claw 15 that presses the valve seat 12.
When held, the outer circumferential surface of the receiver 18 has an outer circumferential shape located at approximately the same position as the outer circumferential surface of the valve seat 12, that is, an arcuate shape as shown in FIG. Further, the receiver 18 is formed with a notch 18a into which each chuck pawl 15 is fitted.

Reference numeral 19 denotes an annular elastic body, which is fitted into a groove 18b formed on the outer periphery of each of the receivers 18, and biases the receivers 18 inward in the radial direction.

20 is a chuck claw driving rod and press-fitting tool body 13
An engaging portion 20a that is slidably provided in the hollow portion 13d and that engages with the protruding portion 15a of the chuck pawl 15 is formed at the tip thereof, and the chuck pawl driving rod 2
The chuck pawl 15 is moved in the radial direction about the pin 16 by moving the chuck pawl 15 forward and backward by a fourth cylinder 21 provided at the other end. With this movement, the receiver 18 also moves in the radial direction.

The amount of movement of the chuck pawl 15 and the receiver 18 is regulated by contact with the inner surface of the valve seat 12, and varies depending on the diameter.

Next, the operation of the embodiment of the present invention will be explained.

First, the valve seat 12 is sent to the set position b by the third cylinder 11 shown in FIG. Moving.

Next, the press-fitting tool 4 is lowered by the first cylinder 5 to insert the small diameter portion 13c of the press-fitting tool body 13 into the valve seat 12, and the fourth cylinder 21 is actuated to move the chuck pawl 15 radially outward. Hold the valve seat 12.

After holding the valve seat 12, the first cylinder 5
is actuated to raise the press-fitting tool 4, and then the second cylinder 6 is actuated to swing the press-fitting device 1 and move it to the position shown in FIG.

Next, the first cylinder 5 is operated again to lower the press-fitting tool 4, and the valve seat 12 is press-fitted into the valve-seat press-fitting part of the cylinder head 8, which has been previously transported to the press-fitting position a and fixed by the clamp device 9. .

During press-fitting, the valve seat 12 is pressurized by the pressurizing surface 18c of the holder 18, and the pressurizing force at this time acts on the press-fit tool body 13 via the holder 18, and no pressure acts on the chuck pawl 15. . When the press-fitting operation is completed, the press-fitting tool 4 is raised by the first cylinder 5 and returns to the initial position.

The press-fitting work is performed by repeating such working steps.

In the above embodiment, the chuck pawl 15 is connected to the pin 1.
6, but it is also possible to guide the movement in a direction perpendicular to the axis of the press fitting tool body and make the tip of the chuck pawl drive rod tapered so that it can be opened and closed in the radial direction. Although the horizontal guide groove is formed as a notch in the tangential direction of the press fitting tool body, it may be formed in a ring shape over the entire outer periphery.

As explained above, according to the present invention, the receiver is provided in the horizontal guide groove formed in the press-fit tool body so as to be movable in the radial direction, and the chuck member moves in the radial direction to hold the ring-shaped part simultaneously. Since the holder is also moved in the radial direction, there is no interference between the workpiece and the holder, and a single press-fitting tool can secure a constant pressing area for ring-shaped parts with different diameters, allowing reliable press-fitting. It is something that

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the operation of a press-fitting device equipped with a press-fitting tool according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of the embodiment of the present invention, Fig. 3 is a cross-sectional view taken along the line - - in Fig. 2, and Fig. 4 is a cross-sectional view of the embodiment of the present invention. FIG. 3 is an explanatory diagram of the groove viewed from the direction of arrow A in FIG. 2; 13...Press fitting tool body, 14...Vertical guide groove, 1
5...Chuck pawl, 17...Horizontal guide groove, 18...
...Cash receiver, 19...Annular elastic body, 20...Chuck pawl driving rod.

Claims (1)

[Scope of utility model registration request] A plurality of vertical guide grooves cut in the radial direction near the tip of the shaft-like body and extending in the axial direction, and a horizontal guide groove formed concave in the radial direction on the outer periphery of the tip and perpendicular to each of the vertical guide grooves. a press-fitting tool body, a chuck member that is movably supported in the radial direction in each vertical guide groove of the press-fitting tool body and holds the ring-shaped part from inside by an opening operation; a drive member that is operated to open at least radially outward; and a drive member that is located outside of each of the chuck members in a number corresponding to the number of the chuck members and moves in the radial direction by coming into contact with each chuck member as the chuck member opens. It can be freely attached to the horizontal guide groove above,
In addition, when each chuck member opens to hold the ring-shaped part, a receiver whose part protrudes from the horizontal guide groove and a receiver arranged around the outer edge of the receiver urges the receiver radially inward. and an annular elastic body, and when each chuck member opens and holds the ring-shaped component, the receiver has a pressure surface that presses the ring-shaped component during press-fitting in the portion protruding from the horizontal guide groove. A press-fitting tool for a ring-shaped component, characterized in that the outer peripheral surface has an outer circumferential shape located at a position substantially equivalent to the outer circumferential surface of the ring-shaped component.