JP2996281B2 - Cotter mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cotter mounting device for mounting a cotter when a valve is mounted on a cylinder head of an engine.

[0002]

2. Description of the Related Art Conventionally, intake and exhaust valves assembled to a cylinder head of an engine incorporate a spring for biasing the valve in a closing direction. One end of the spring abuts the cylinder head, and the other end of the valve stem is the tip of the valve stem. It is in contact with the retainer provided on the side. This retainer has a disk shape, and has a tapered hole at the center for inserting the valve stem, and the retainer is engaged with the valve stem via a cotter disposed in the tapered hole.

The procedure for assembling the cotter is as described below. First, the spring is loosely fitted to the valve stem, and the retainer is arranged on the spring with the pair of cotters arranged in advance in the tapered hole of the retainer. Next, the cotter mounting device pushes down the retainer against the urging force of the spring, and the cotter is once pushed out of the tapered hole into the cotter mounting device by the valve stem inserted into the tapered hole of the retainer, and the tip of the valve stem is retained by the retainer. To be inserted between both cotters, the tip of the valve stem is sandwiched between the pair of cotters, and the projection formed on the inner peripheral surface of the cotter is engaged with the engaging groove formed on the outer peripheral surface of the valve stem. . In this state, the cotter sandwiching the valve stem is inserted into the tapered hole while returning the retainer to the initial position.

[0004]

However, according to the above-mentioned conventional construction, when the cotter is pushed into the cotter mounting device from the tapered hole of the retainer, the cotter may be inclined in the cotter mounting device, and the valve stem may be tilted. However, there has been a problem that the cotter cannot be normally mounted, and sliding scratches occur on the inner peripheral surface of the cotter and the outer peripheral surface of the valve stem.

The present invention solves the above-mentioned problems, and
An object of the present invention is to provide a cotter mounting device that can always hold a cotter in a normal posture on a valve stem when the cotter is incorporated into a retainer.

[0006]

In order to solve the above-mentioned problems, a cotter mounting device according to the present invention is provided with a retainer that loosely fits into a valve stem in a tapered hole and receives a biasing force of a spring in an axial direction of the valve stem. In order to attach the tapered cotter in a state where the protrusion formed on the inner peripheral surface is engaged with the engagement groove of the valve stem,
An apparatus used by being mounted on at least a lifting drive means capable of moving up and down, wherein a pair of retainer pressing plates are vertically provided on a pedestal forming a mounting portion for the lifting driving means, and the retainer pressing plates are provided on the tip end surfaces of both retainer pressing plates. A retainer engagement notch is formed on the outer peripheral edge, a cylinder device is provided on the pedestal along the retainer pressing plate, and a parallel chuck device having parallel arms approaching and separating from each other is mounted on the rod of the cylinder device. A support rod is provided on both parallel arms so as to be able to move up and down, a return spring is provided to urge the support rod downward, and a cotter holding block is provided which is fixed to both support rods and holds the cotter. An arc-shaped cotter suction portion is formed on the opposite surface of the cotter holding block, and one end of each cotter holding block is opened to the cotter suction portion and the other end is connected to the suction source. Hole is formed, in which the leading end of the parallel arm has a configuration which is formed on the pressing section capable of contacting the cotter in the axial direction of the valve stem.

[0007]

According to the above construction, when a cotter is mounted on the retainer, the cotter is mounted on the cotter suction portion of the cotter holding block in advance, and the entire apparatus is disposed above the retainer. At this time, the cotter suction unit sucks and holds the cotter in a state where the outer peripheral surface of the cotter comes into contact with the arc-shaped suction surface of the cotter suction unit by the suction force acting on the suction hole.
Also, both cotter holding blocks are separated from each other with an appropriate gap between the opposing surfaces.

The entire device is lowered by driving the lifting drive means, and the retainer is pressed down against the urging force of the spring in a state where the retainer engaging notch of the retainer pressing plate is engaged with the peripheral edge of the retainer, thereby pushing down the valve stem. The tip is exposed from the tapered hole of the retainer. In this state, the parallel arm and the cotter holding block are brought closer to each other by driving the parallel chuck device, and the tip of the valve stem is positioned between the left and right cotters.

Next, by driving the cylinder device, the parallel chuck device is lowered while the cotter holding block is in contact with the retainer. At this time, when the support rod slides up and down with respect to the parallel arm, the parallel arm descends while the cotter holding block stays at the current position, and the parallel arm is pressed against the cotter sucked and held by the cotter suction unit. The claws abut. As the parallel arm further descends, the pressing claw pushes the cotter downward from the cotter suction portion and inserts the cotter into the tapered hole of the retainer, and the protrusion of the cotter corresponds to the engagement groove of the valve stem. In this state, when the entire device is pulled up by driving the lifting / lowering drive means, the retainer moves back to the original position under the urging force of the spring, and the cotter is included in the tapered hole. At this time, the outer peripheral surface of the taper of the cotter comes into contact with the inner peripheral surface of the tapered hole of the retainer, and the projection of the cotter engages with the engagement groove of the valve stem, so that the cotter receives the urging force of the spring. Receive the retainer.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 4, a retainer 1 has a tapered hole 1.
1A, it is loosely fitted to the valve stem 2 and receives the urging force of the spring 3 in the axial direction of the valve stem 2. The cotter 4 is a halved part having a tapered shape, and a protrusion 4 a formed on the inner peripheral surface is engaged with the engagement groove 2 a of the valve stem 2.

The cotter mounting device 5 is a device which is used by being mounted on at least a vertically driving means (not shown) capable of vertically moving such as a robot arm or an automatic machine. Cotta mounting device 5
In FIG. 4, a pair of retainer pressing plates 7 are vertically provided on a pedestal 6 serving as a mounting portion for the lifting drive means, and as shown in FIG.
Both retainer pressing plates 7 have retainer engaging notches 7a formed on the distal end surfaces to engage with the outer peripheral edge of the retainer 1. The pedestal 6 is provided with a cylinder device 8 that moves up and down along the plate surface of the retainer pressing plate 7 between the two retainer pressing plates 7. Is provided.

The parallel chuck device 9 has a pair of left and right parallel arms 10 approaching and separating from each other along the plate surface of the retainer pressing plate 7, and both parallel arms 10 are supported by rod support portions 10a on the side. The rod 11 is supported so that it can move up and down. The support rod 11 is formed of a ball spline or the like, and a return spring 12 for urging the support rod 11 downward is loosely fitted to the support rod 11.

A cotter holding block 13 is provided fixedly to the ends of both support rods 11, and as shown in FIG. It is formed. Each cotter holding block 13 is formed with a suction hole 15 having one end open to the cotter suction portion 14 and the other end communicating with a suction source (not shown). The parallel arm 10 has a pressing claw portion 16 whose tip can contact the cotter 4 in the axial direction of the valve stem 2, and the pressing claw portion 16 is provided with an arc-shaped concave portion 16 a corresponding to the shape of the valve stem 2. It is.

The operation of the above configuration will be described below. The cotter 4 is previously mounted on the cotter suction portion 14 of the cotter holding block 13, and the entire cotter mounting device 5 is disposed above the retainer 1. At this time, in the cotter suction unit 14, the cotter 4
The cotter 4 is sucked and held in a state in which the outer peripheral surface of the cotter abuts on the arc-shaped suction surface of the cotter suction unit 14. Further, both cotter holding blocks 13 are separated from each other with an appropriate gap between the opposing surfaces.

Next, as shown in FIG. 5, the entire cotter mounting device 5 is lowered by driving the lifting drive means, and the retainer engaging notch 7a of the retainer pressing plate 7 is engaged with the peripheral edge of the retainer 1. Then, the retainer 1 is pushed down against the urging force of the spring 3 to expose the tip of the valve stem 2 from the tapered hole 1a of the retainer 1.

In this state, as shown in FIG. 6, by driving the parallel chuck device 9, the parallel arm 10 and the cotter holding block 13 are brought closer to each other, and the tip of the valve stem 2 is positioned between the left and right cotters 4. Let it.

Next, as shown in FIG.
, The parallel chuck device 9 is lowered while the cotter holding block 13 is in contact with the retainer 1. At this time, the support rod 11 slides up and down on the rod support portion 10 a with respect to the parallel arm 10, so that the parallel arm 10 descends while the cotter holding block 13 remains at the current position, and is sucked by the cotter suction portion 14. The pressing claw 16 of the parallel arm 10 abuts on the cotter 4 to be held.

As the parallel arm 10 further descends, the pressing claw 16 pushes the cotter 4 downward from the cotter suction portion 14 and inserts the cotter 4 into the tapered hole 1a of the retainer 1 while avoiding the valve stem 2 in the recess 16a. The projection 4a of the cotter 4 corresponds to the engagement groove 2a of the valve stem 2.

In this state, when the entire cotter mounting device 5 is pulled up by the drive of the lifting / lowering driving means, the retainer 1 receives the urging force of the spring 3 and returns to the original position.
The cotter 4 is included in the tapered hole 1a. At this time, the tapered outer peripheral surface of the cotter 4 abuts on the inner peripheral surface of the tapered hole 1a of the retainer 1, and the projection 4a of the cotter 4 engages with the engagement groove 2a of the valve stem 2 so that the cotter 4 Receives the retainer 1 against the urging force of the spring 3.

[0020]

As described above, according to the present invention, the cotter is sucked and held by the cotter holding block, the cotter is arranged so as to sandwich the valve stem, and the cotter is moved downward from the cotter sucking portion by the pressing claw portion. The cotter is inserted into the tapered hole of the retainer while pushing it out, and the protrusion of the cotter corresponds to the engagement groove of the valve stem, so that when the cotter is installed in the retainer, the cotter is always hugged to the valve stem in a normal posture. it can.

[Brief description of the drawings]

FIG. 1 is an overall front view of a cotter mounting apparatus showing one embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows AA in FIG.

FIG. 3 is a view taken in the direction of arrows BB in FIG. 2;

FIG. 4 is a view taken in the direction of arrows CC in FIG. 1;

FIG. 5 is an operation explanatory view showing an operation of the cotter attaching device in the embodiment.

FIG. 6 is an operation explanatory view showing an operation of the cotter attaching device in the embodiment.

FIG. 7 is an operation explanatory view showing an operation of the cotter attaching device in the embodiment.

[Explanation of symbols]

 Reference Signs List 1 retainer 2 valve stem 3 spring 4 cotter 5 cotter mounting device 7 retainer pressing plate 8 cylinder device 9 parallel chuck device 10 parallel arm 11 support rod 13 cotter holding block 14 cotter suction unit 15 suction hole 16 pressing claw unit

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B23P 21/00 303 F01L 3/24

Claims (1)

(57) [Claims] 1. A retainer which is loosely fitted to a valve stem in a tapered hole and receives a biasing force of a spring in an axial direction of the valve stem. A protrusion formed by forming a tapered cotter on an inner peripheral surface of the retainer engages with the valve stem. A device for mounting in a state of being engaged with the groove, which is used by being attached to at least ascending and descending drive means capable of ascending and descending movement,
A pair of retainer pressing plates are vertically provided on a pedestal forming a mounting portion for the lifting drive means, and a retainer engaging notch for engaging with an outer peripheral edge of the retainer is formed at a tip end surface of both retainer pressing plates, and a retainer pressing is formed on the pedestal. Provide a cylinder device that moves back and forth along the plate, mounts a parallel chuck device that has parallel arms that approach and separate from each other on the rod of the cylinder device, and provides a support rod that can move up and down on both parallel arms and supports A return spring that urges the rod downward is provided, a cotter holding block that is fixed to both support rods and holds the cotter is provided, and an arc-shaped cotter suction portion is formed on a facing surface of both cotter holding blocks, One end of each cotter holding block is opened to the cotter suction portion, and the other end is formed with a suction hole communicating with the suction source. Cotter attachment device, characterized in that formed on the can contact pressing section.