JPH0318649Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a pressing jig for a valve rotator rotation inspection machine that rotates a valve of an internal combustion engine in one direction little by little each time the valve is opened or closed. .

(Prior Art) As shown in Fig. 1, an umbrella part (not shown) for opening and closing the intake and exhaust ports of the cylinder is formed at the lower end of the vertical shaft 2 of the valve 1 of an internal combustion engine. , and a hole at the center of the main body 4 of the valve rotator 3 is fitted into the upper end of the shaft rod 2 via a clasp 5, and both are connected by the clasp 5.

A retainer 8 is attached to the outside of the main body 4 via a check mechanism consisting of balls 6, disc springs 7, and the like.

When the main body 4 is pushed into the retainer 8, it rotates a small amount in one direction, but due to the action of the non-return mechanism, it cannot return to the original position from the pushed position. ing.

The umbrella portion of the valve 1 comes into pressure contact with the valve seat at the intake/exhaust port and closes it due to the force of the compression spring 9 pressing the retainer 8 from below.

Rotsuker arm 11 interlocking with a cam (not shown)
However, when the upper end surface of the shaft rod 2 is pressed to move the shaft rod 2 up and down, the valve 1 gradually rotates in a fixed direction as the valve rotator 3 rotates.

Regarding the valve rotator 3, it is necessary to inspect whether it can generate the required rotational torque in response to the load applied to the main body 4. This test is
This is done by repeatedly pressing the main body 4 of the valve rotator 3 with a pressing jig, which will be described later, and checking whether the main body 4 is rotating properly.

Conventionally, in order to press the main body 4 of the valve rotator 3, a substantially spherical pressing jig 12 as shown in FIG. 2 has been used.

This pressing jig 12 is fixed to an indicating member 14 rotatably provided at the lower end of a vertical shaft 13 of an inspection machine which will be described later.

When the main body 4 rotates intermittently in a certain direction due to repeated pressing by the pressing jig 12, the indicating member 14 also rotates together with the rotation. The worker must, within a reasonable time,
It is visually inspected whether the indicating member 14 is rotating properly.

(Problems to be Solved by the Invention) The conventional indicating member 12 as described above is convenient for the main body 4 whose size matches the diameter of the spherical part, but when the main body 4 is large enough to match the diameter of the spherical part, For the main body 15 of this size, it is necessary to use a pressing jig 16 consisting of a spherical part with a large diameter that matches the hole diameter.

Therefore, it is necessary to prepare pressing jigs of various sizes, and each time the dimensions of the valve rotator to be inspected change, it is necessary to replace the pressing jigs with suitable ones, which is troublesome.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a valve rotator that has a vertical hole in the center and is rotatable in only one direction and is attached to a retainer. The pressing jig is placed on a mounting base that can be raised and lowered, and is designed to test the rotation of the rotator body in one direction by repeatedly pressing the rotator body from above. It is characterized by its surface being shaped like a downward cone.

(Example) Hereinafter, an example of the present invention will be described based on the figures from FIG. 4 onwards.

In FIG. 4, the cam 18 located at the top of the rotation inspection machine 17 is fixed to the front end of a horizontal shaft 19 attached to the main body (not shown) of the rotation inspection machine 17, and is driven in the direction of the arrow by a motor (not shown). be rotated to

A vertical shaft 13 supported by an appropriate support member so as to be able to move up and down is biased upward by a spring (not shown), and a flange 22 provided at the upper end of the shaft 13 pushes against the bottom surface of the cam 18. They are in pressure contact.

A pointing member 14 is rotatably attached to the lower part of the shaft rod 13, and an upper end of a rotating shaft 24 of a pressing jig 23 is detachably attached to the lower surface of the pointing member 14. Pressing surface 23a of pressing jig 23
is in the shape of a downward cone.

Mounting base 25 located below the pressing jig 23
is integrally provided at the upper end of the vertical shaft 27 inserted through the horizontal support plate 26. Mounting stand 25
A compression spring 28 is wound around the vertical shaft 27 between the vertical shaft 27 and the support plate 26, and the mounting base 25 is biased upward.

The lower part of the vertical shaft 27 is a rack 29,
A pinion 31, which is pivotally supported by a suitable member, meshes with this rack 29. The pinion 31 has
A handle 32 is fixed.

The valve rotator 3 to be inspected is appropriately mounted on the upper surface of the mounting base 25.

The pinion 31 is rotated by the handle 32,
When the mounting base 25 is raised via the rack 29, the edge 4a of the hole in the main body 4 of the valve rotator 3 comes into pressure contact with the pressing surface 23a of the pressing jig 23, as shown in FIG.

Since the pressing jig 23 moves up and down as a result of the rotation of the cam 18, a force is repeatedly applied to the main body 4 in the direction of pushing it into the retainer 8.

By repeatedly pressing with the pressing jig 23, the main body 4
rotates intermittently in a fixed direction, and following this, the pressing jig 23 and the indicating member 14 rotate integrally in the direction of the arrow shown in FIG.

This amount of rotation is indicated by a scale 33 provided on the circumferential surface of the indicating member 14.

The indicating member 14 rotates at a constant speed when the valve rotator 3 to be inspected is appropriate;
The amount of rotation of the indicating member 14 within a certain period of time is constant.

The valve rotator 3 is inspected by measuring the rotational speed and amount of rotation of the indicating member 14.

As shown in FIG. 6, when the main body 15 of the valve rotator 3 to be inspected is large, the large diameter portion of the pressing surface 23a comes into contact with the edge 15a of the hole in the main body 15, so the pressing jig is used. Valve rotators of different sizes can be tested without replacing the valve rotator 23.

(Effects of the invention) According to the invention, since the pressing surface of the pressing jig that presses the main body of the valve rotator has a downward conical shape, valve rotators of different sizes can be inspected with one pressing jig. It is possible and convenient.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of a valve rotator attached to the shaft rod of a valve, with the right half cut vertically, Figs. 2 and 3 are front views of a conventional pressing jig, and Fig. 4 1 is a front view schematically showing a rotation inspection machine equipped with the pressing jig of the present invention, and FIGS. 5 and 6 are front views showing enlarged main parts of the pressing jig of the present invention. 1... Valve, 2... Shaft rod, 3... Valve rotator, 4... Body, 5... Kotsuta, 6... Ball, 7... Belleville spring, 8... Retainer, 9... Compression spring, 11 ...Lotsuker arm, 12...pressing jig, 13...shaft rod, 14...instruction member, 15...
Main body, 16...pressing jig, 17...rotation inspection machine,
18...Cam, 19...Horizontal shaft, 22...Flange, 23...Press jig, 23a...Press surface, 24
... Rotating shaft, 25 ... Mounting base, 26 ... Support plate, 27 ... Vertical shaft, 28 ... Compression spring, 29 ...
...Rack, 31...Pinion, 32...Handle.

Claims (1)

[Scope of utility model registration request] A valve rotator, which has a vertical hole in the center and is rotatable in only one direction and is attached to a retainer, is placed on a mounting base that can be raised and lowered,
In addition, a pressing jig is designed to test the rotation of the rotator body in one direction by repeatedly pressing the rotator body from above, and the pressing surface thereof is formed in a downward conical shape. A pressing jig for a rotation inspection machine for a valve rotator, which is characterized by: