JPH039548Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a fine adjustment setting cam used for setting valve intermediate stop positions of electric valve actuators. The present invention relates to a fine adjustment setting cam that allows fine adjustment to be made in stages.

(b) Prior art Conventional cam angle setting generally involves fixing a cam boss integrally formed with the cam body and a camshaft using a set screw.
In this conventional configuration, the scratches on the camshaft caused by the set screw cause the position to shift slightly during fine adjustment, making it extremely difficult to finely adjust the angle setting. There was a problem.

(c) Purpose The present invention was developed in view of the above-mentioned conventional problems and to solve them.It is possible to avoid damaging the camshaft by attaching the cam boss separated from the cam body to the camshaft in advance. The main object of the present invention is to provide a fine adjustment setting cam which can easily and reliably adjust the rotation angle of the entire cam by finely adjusting the cam body relative to the cam boss after being fixed.

(D) Structure The present invention includes a camshaft, cam bodies rotatably fitted into the camshafts, and cam bosses that are separated from the cam body and are rotatably disposed in surface contact with the cam body. The cam boss is provided with a tightening tool that tightens and fixes the cam boss in a tightening groove provided at the base of the cam boss so that the angle can be adjusted freely, while a tightening tool is provided between the cam body and the cam boss to finely adjust the rotation angle of the cam body. A cam adjusting means is arranged, and one side of the cam adjusting means penetrates a through hole of a protrusion provided on the cam body and is freely supported by a spring pin, and the other side penetrates a through hole of a protrusion provided on the cam boss. A cam adjustment bolt is screwed into the screw hole, and a nut is screwed to the other end of the cam adjustment bolt protruding from the male screw hole, and the cam is adjusted at a position inside the male screw hole on the projection side of the cam body. A lock nut is placed on the abdomen of the bolt.

(e) Embodiment FIGS. 1a and 1b show a cam for fine adjustment setting according to the first embodiment of the present invention, in which 1 is the cam body, 2
3 is a cam boss formed separately from the cam body 1, and 3 is a camshaft.

A protrusion 11 is formed at a predetermined position on the cam body 1, and the protrusion 11 is provided with a through hole 12 and a pin insertion hole 13 communicating with the through hole from the outer surface. In addition, a shaft hole is provided at approximately the center position.

The cam boss 2 also includes a base portion 21 having a shaft hole and a tightening groove 212 penetrating downward from the shaft hole;
It consists of a head 22 extending upward from the upper left end of the base 21, and a tightening groove 212 in the base 21.
One female screw hole 213 and the other screw through hole 214 are provided, passing through the head 22 from side to side, and a female screw 221 passing from side to side is bored in the head 22.

As shown in the figure, the cam body 1 and the cam boss 2 are arranged such that a camshaft 3 passes through each shaft hole, and they are in rotatable surface contact with each other.

One screw through hole 21 in the base 21 of the cam boss 2
A fastener 4 made of a hexagonal bolt is penetrated from the outside of the fastener 4, and the bolt portion of the fastener 4 is screwed into the other female threaded hole 213.

The bolt portion of the cam adjustment bolt 5 is screwed into the female screw hole 221 of the head 22 of the cam boss 2, and the nut 6 is screwed into the protruding portion of this bolt portion (the outer surface of the head 22), and the cam Screw the adjustment bolt into the base end (inner side of the head 22) with the lock nut 7.
are screwed together, and the head of the cam adjustment bolt 5 is freely supported by a spring pin 8 inserted into the through hole 12 of the protrusion 11 of the cam 1 and inserted into the pin insertion hole 13. ing.

Next, to explain how to adjust the rotation angle of the fine adjustment setting cam configured as described above, first, the rotation angle of the cam body 1 is determined to a certain extent, and then the cam boss 2
position against the camshaft 3, and tighten the fastener 4.
Screw on and tighten the base 21 of the cam boss 2,
First, fix cam boss 2 to the camshaft.

Next, the nut 6 is loosened, the lock nut 7 is turned to finely adjust the rotation angle of the cam body 1, and the nut 6 is tightened to securely connect the cam body 1 to the cam boss 2.

Therefore, the cam body 1 is fixed to the camshaft 3 at a predetermined accurate rotation angle.

(F) Effects The present invention includes a camshaft, a cam body rotatably fitted into the camshaft, and a cam boss that is separated from the cam body and is rotatably disposed in surface contact with the cam body. The cam boss is provided with a tightening tool that tightens and fixes the cam boss in a tightening groove provided at the base of the cam boss in a manner that allows the angle to be freely adjusted, while a tightening tool is provided between the cam body and the cam boss to finely adjust the rotation angle of the cam body. A cam adjustment means is arranged, and one side of the cam adjustment means penetrates a through hole of a projection provided on the cam body and is freely supported by a spring pin, and the other side penetrates a through hole of a projection provided on the cam boss. A cam adjustment bolt is screwed into a screw hole, and a nut is screwed to the other end of the cam adjustment bolt protruding from the male screw hole, and a cam adjustment is performed at a position inside the male screw hole on the projection side of the cam body. Since this is a cam with fine adjustment settings, which is characterized by a locking nut placed on the abdomen of the bolt, first, the rotation angle of the cam body is determined to a certain degree in advance, and then the bolt, which is a tightening tool, is tightened. to fix the cam boss to the camshaft, and then use the cam adjustment means to finely adjust the rotation angle of the cam body. This makes it possible to easily and reliably adjust the rotation angle without damaging the camshaft at all. It has the effect that fine adjustments can be made.

[Brief explanation of drawings]

FIG. 1a is a perspective view of a fine adjustment setting cam according to a first embodiment of the present invention, and FIG. 1b is a front view thereof. 1...Cam body, 2...Cam boss, 3...Camshaft, 4...Tightening tool, 5...Cam adjustment bolt.

Claims (1)

[Scope of utility model registration request] The camshaft is equipped with a cam shaft, a cam body rotatably inserted into the camshaft, and a cam boss that is separated from the cam body and rotatably arranged with respect to each other in surface contact with the cam body. A tightening tool is disposed in a tightening groove provided at the base to tighten and fix the cam boss in a freely adjustable angle, while a cam adjustment means for finely adjusting the rotation angle of the cam body is disposed between the cam body and the cam boss. ,
The cam adjustment means includes a cam adjustment bolt, one of which passes through a through hole of a projection provided on the cam body and is freely supported by a spring pin, and the other end of which is screwed into a male threaded hole of a projection provided on the cam boss. Equipped with
A nut is screwed onto the other end of the cam adjustment bolt protruding from the male threaded hole, and a lock nut is arranged on the abdomen of the cam adjustment bolt located inside the male threaded hole on the protrusion side of the cam body. Features a cam with fine adjustment settings.