JPS6135397Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a polishing machine used for repair polishing of valve seats in internal combustion engines.

Conventional technology and its problems When the intake valve and exhaust valve of an internal combustion engine are used for a certain period of time, wear occurs on the valve seats, but this wear does not occur evenly around the entire circumference, and there are problems such as unilateral burrs and eccentricity. Occurs in the state. Therefore, when such wear occurs, it is necessary to polish and repair the valve seat to correct uneven burrs and the like.

Conventionally, this polishing has been carried out by fitting a cylindrical polisher with a polishing tool attached to the lower end onto a fixed shaft installed upright in the valve guide, and connecting the upper end of this polisher to a rotary drive machine.The rotation of the polishing tool drives the valve. The sheet is being polished.

However, since this polishing machine rotates only around the lower end fitting part with respect to the fixed shaft, vibration occurs in the upper part of the polishing machine, which creates a center on the polishing surface and also causes wear and tear on the sliding surface due to vibration. As a result, various parts become rattled, resulting in not only poor polishing accuracy but also durability problems.

Purpose of the invention The purpose of the present invention is to eliminate the drawbacks of the above-mentioned conventional polishing machines.

Means for Achieving the Object In order to achieve the above object, the polishing machine of the present invention includes a fixed shaft that is inserted into the valve guide of the prime mover body, and a fixed shaft that is rotatably inserted into the fixed shaft. an inner cylinder having a concentric shaft, an outer cylinder fitted onto the inner cylinder and holding the inner cylinder rotatably and movably in the axial direction; supported and fixed to the outer cylinder so as to be slidable in the axial direction; It also consists of a holder protruding almost perpendicularly to its axial direction, and a fixture that supports the tip of the holder and is fixed to the prime mover main body via a magnetic base. Attaching a polishing tool to be pressed into contact with a valve seat fitted into a seat receiving portion of a prime mover body, making the inner cylinder rotatable by a rotary drive machine, and further forming a tip of the holder into a spherical shape, The receiving surface of the fixture whose tip is fitted and rotatably supported is formed into a spherical hole, and the supporting state of the fixture in the fixture can be fixed at the position where the fixture is set relative to the fixture. He made it a reality.

Function: In a polishing machine constructed in this way, after removing the valve, a fixed shaft is inserted and erected in the valve guide, a polishing tool is attached to the lower end of the inner cylinder, and the inner cylinder is externally fitted onto the fixed shaft. Place the magnetic base on the prime mover body and secure it. At this time, the inner cylinder swings through the spherical portion to be coaxial with the fixed shaft.

Next, a polishing tool is brought into contact with the valve seat to apply rotational force to the inner cylinder, and the valve seat is polished by the polishing tool.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

In the figure, 1 is an inner cylinder that is rotatably inserted into the fixed shaft c and is coaxial with the fixed shaft c, and 2 is externally fitted to the inner cylinder 1 so as to be coaxial with it, and the inner cylinder 1 is rotatably inserted. and an outer cylinder held via a bearing 3 so as to be movable in the axial direction.

A connecting part 6 is attached to the upper end of the inner cylinder 1, which has a square hole 4 for connecting to a motor that serves as a rotary drive machine, and an air vent hole 5, and a male thread is attached to the outer peripheral surface of the lower end, which has a smaller diameter. 7 is formed, and a polishing tool 8 made of a grindstone is detachably attached to the lower end using this male screw 7.

The polishing surface of the grindstone 8 is formed in an inclined shape at an angle that matches the valve contact surface of the valve seat B fixed to the internal combustion engine main body A so as to be embedded therein.

The outer surface of the inner cylinder 1 is hardened by quenching, and the inside has a larger diameter from the middle part to the upper part, and a support member 9 that fits on the upper end of the fixed shaft c is provided in the larger diameter inside. Assemble so that it can move in the axial direction. The support member 9 is formed with a tapered hole 11 that fits into a tapered portion 10 provided at the upper end of the fixed shaft c.

A compressed spring 14 is installed in the upper part of the support member 9 via a ball 12 and a spring receiver 13 so as to provide downward movement elasticity to the support member 9 at all times.

Reference numeral 15 denotes a holder that is supported and fixed to the outside of the outer cylinder 2 so as to be slidable in the axial direction thereof, and a part of the annular part 16 that fits onto the outer cylinder 2 is cut off, and this separated part is attached to a bolt 17 and a nut. 18 to fix the outer cylinder 2 to the holder 15,
The annular portion 16 is provided with a spherical portion 20 at the tip of an arm 19 that projects outward at a substantially right angle to the axial direction of the outer cylinder 2.

Reference numeral 21 denotes a fixture for fixing the holder 15 to the prime mover main body A. A cylinder 24 is erected on a magnet base 23 which is attached and detached using a handle 22. A large diameter window hole 25 is formed in the peripheral wall through which the arm rod 19 passes, and inside the cylinder body 24 there is a receiving member 26 for receiving the spherical end portion 20 of the arm rod 19, and a holding member 2 that rests on the spherical portion 20.
7 is incorporated to form the receiving surface of the spherical part 20 into a spherical hole, and furthermore, a presser screw shaft 30 having a slot 29 at the upper end is attached in a penetrating manner to the cap 28 screwed onto the upper part of the cylindrical body 24. A catch seat 31 is provided on the upper surface of the presser member 27 to receive the lower end of the screwed presser screw shaft 30, and a bullet 32 is provided between the cap 28 and the presser member 27.
to be reduced.

When the presser screw shaft 30 is loosened, the spherical portion 20 is held by the elasticity of the bullet 32, and the holder 15 is
The holder 15 can be freely moved in all directions around the spherical part 20, and the holder 15 can be set at a desired position relative to the fixture 21. Conversely, when the presser screw shaft 30 is screwed in, the holder 15 is completely fixed. Then, the holder 15 is fixed to the fixture 21 at the set position.

In the figure, D is a valve guide in the valve-integrated portion of the motor body A, into which the fixed shaft C is inserted in an upright position during polishing.

The embodiment has the structure as described above, and in order to polish the valve seat B, first, after removing the valve, insert the fixed shaft C into the valve guide D and set it upright, and at the same time, polish the lower end of the inner cylinder 1. Attach fixture 8, fixing fixture 2
With the presser screw shaft 30 of No. 1 loosened, the inner cylinder 1 is externally fitted onto the fixed shaft C, and the magnet base 23 is placed and fixed on the prime mover main body A. At this time, inner cylinder 1
Since it is held in the fixture 21 so that it can freely swing in all directions by the spherical part 20, it becomes coaxial with the fixed shaft C at the same time as it is externally inserted into the fixed shaft C.

Next, with the polishing tool 8 in contact with the valve seat B, the presser screw shaft 30 of the fixture 21 is screwed in to fix the holder 15 as shown in FIG. In this state, when the rotating shaft of the motor is connected to the connecting part 6 provided at the upper end of the inner cylinder 1 and the inner cylinder 1 is pushed down and rotated at high speed, the inner cylinder 1 is fixed by the outer cylinder 2 to the fixed axis C. Since it is held concentrically with the valve seat B, there is no runout, and the polishing tool 8 polishes the valve contact surface of the valve seat B to a predetermined angle.

Effects of the invention As described above, according to the valve seat polishing machine of this invention, since the inner cylinder is supported at two points by the fixing device and the fixed shaft, the inner cylinder does not wobble during rotation, and it is held in place. Since the tool is made swingable with respect to the fixture and can be fixed at any swinging position, the inner cylinder can always be held and fixed on the coaxial axis with respect to the fixed shaft.

Therefore, the polishing machine of this invention has the effect of easily obtaining valve seats with high polishing accuracy, and the durability of the polishing machine itself is also improved because the vibration of each rotating member is extremely low. do.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the polishing machine according to the present invention in use, and FIG. 2 is a cross-sectional plan view of the same. 1... Inner cylinder, 2... Outer cylinder, 8... Polishing tool, 15
... Holder, 20 ... Spherical part, 21 ... Fixture,
23...Magnetic base, B...Valve seat, C...Fixed shaft, D...Valve guide.

Claims (1)

[Scope of utility model registration request] A fixed shaft that is inserted into the valve guide of the prime mover body, an inner cylinder that is rotatably inserted into the fixed shaft and has a concentric axis with the fixed shaft, and an inner cylinder that is fitted onto the outside of the inner cylinder so that the inner cylinder can rotate freely and axially. An outer cylinder that is movably held;
A holder is supported and fixed to the outer cylinder so as to be slidable in the axial direction thereof and protrudes almost perpendicularly to the axial direction, and the tip of the holder is supported and connected to the prime mover body via a magnetic base. A polishing tool is attached to the lower end of the inner cylinder to be pressed against a valve seat fitted to a seat receiving portion of the prime mover body, and the inner cylinder can be rotated by a rotary drive machine. Further, the distal end of the holder is formed into a spherical shape, and the receiving surface of the fixture into which the distal end is fitted and rotatably supported is formed into a spherical hole; A valve seat polishing machine characterized in that the supporting state is such that the holder can be fixed in a set position relative to the fixture.