JP2010103025A - Sliding component and device equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sliding component with a reduced cost and a device equipped with the same. <P>SOLUTION: A returning plunger 10 is composed integrally of a resin part 15 of a bottomed cylindrical shape accommodating a spring 9 and a metal part 16 made of sintered metal sliding with a flat cam part 7a of a rotating operation shaft 7, and a driving plunger 11 is composed integrally of a resin part 17 of a bottomed cylindrical shape accommodating an interior spring or the like and a metal part 18 made of sintered metal mounted on an upper end of the resin part 17 and sliding with a flat cam part 7a of the operation shaft 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sliding component and various apparatuses including the sliding component.

  For example, a limit switch is known in which the rotation of an operation shaft rotated by an operation lever is converted into a linear displacement of an actuating plunger to switch a built-in switch (for example, a patent) Reference 1).

  FIG. 4 is a cross-sectional view of an operation head portion that rotatably supports the operation shaft of the limit switch.

  A head case 5 of the operation head is connected to a main body case 3 containing the switch (not shown), and the operation shaft 7 is rotatably attached to the head case 5. An operation lever (not shown) is connected to the outer end of the operation shaft 7 protruding from the head case 5.

  A flat cam portion 7 a is formed on the operation shaft 7 in the head case 5, and a lower end flat surface of the return plunger 10-1 biased downward by the spring 9 is formed on the upper surface of the flat cam portion 7 a. The operating shaft 7 is held in a neutral posture by being pressed and abutted, and the operating plunger 11-1 biased upward is received and supported by the lower surface of the flat cam portion 7a.

When the roller at the tip of the operation lever comes into contact with the object to be detected and a rotational operation force is applied to the operation shaft 7, the flat cam portion 7 a of the operation shaft 7 pushes the return plunger 10-1 to bias the spring 9. It is rotated while being pushed up and displaced against the above, and the operation plunger 11-1 is pushed down on the lower surface of the flat cam portion 7a to turn on the built-in switch, and the operation force to the operation lever is released. Then, the operating shaft 7 is returned to its original neutral position by the pressing force applied from the return plunger 10-1 to the upper surface of the flat cam portion 7a, and the operating plunger 11-1 is also returned and raised. And it comes to return to switch-off.
JP-A-8-22743

  In the limit switch configured as described above, when the roller at the tip of the operation lever comes into contact with the object to be detected and the operation shaft 7 rotates, as shown in FIG. 5, the one edge of the flat cam portion 7a of the operation shaft 7 is returned to the edge. When the lower surface of the plunger 10-1 is in local line contact and slides, the return plunger 10-1 is pushed up and displaced, while the other edge of the flat cam portion 7a and the operating plunger 11-1 are displaced. The upper surface of the material is pushed down by sliding in local line contact.

  As described above, the return plunger 10-1 and the actuation plunger 11-1 are required to have wear resistance in order to locally contact and slide on the flat cam portion 7a. 11-1 as a whole is made of, for example, a sintered alloy, which is expensive.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a sliding component with reduced cost and an apparatus using the same.

  (1) In the sliding component of the present invention, at least the sliding surface is integrated with a metal portion made of a sintered metal or a nitrided metal and a resin portion made of a resin.

  According to the sliding component of the present invention, at least the sliding surface is composed of a sintered metal or a metal obtained by nitriding the surface, but the other portions are composed of a resin and are integrated. The cost can be reduced as compared with the case of using a sintered metal.

  (2) In one embodiment of the sliding component of the present invention, the sliding surface is in sliding contact with a flat cam portion provided on the rotating shaft.

  According to this embodiment, when the rotation shaft rotates, the flat cam portion locally comes into sliding contact with the sliding surface. The sliding surface is a metal part such as sintered metal. Therefore, it has sufficient hardness and wear resistance.

  (3) In the embodiment of the above (2), the resin portion may have a cylindrical portion that houses a component therein.

  The cylindrical portion may be a bottomed cylindrical portion or a simple cylindrical shape. The cylindrical portion is not limited to a cylindrical shape, and may be a triangular cylindrical shape, a rectangular cylindrical shape, or a polygonal cylindrical shape.

  The part housed in the cylindrical part is preferably a part such as a spring that urges the sliding part against the rotating shaft.

  According to this embodiment, since the resin portion other than the sliding surface has a cylindrical portion, at least a part of the component can be stored using the space inside the cylindrical portion. it can.

  (4) In another embodiment of the sliding component of the present invention, the metal part and the resin part are integrated by press-fitting or insert molding.

  According to this embodiment, it can be firmly integrated at a relatively low cost.

  (5) The device of the present invention includes the sliding component according to the present invention.

  According to the apparatus of the present invention, since the sliding surface is made of sintered metal or metal whose surface is nitrided and the other part is made of a sliding part made of resin, the whole is made of sintered metal. The cost can be reduced as compared with the apparatus using the sliding parts.

  (6) In one embodiment of the device of the present invention, the operation lever attached to the projecting end of the operation shaft is swung to rotate the operation shaft against the return biasing force, and is built in. A device for operating the switch, wherein the sliding component has a sliding surface that is in sliding contact with the flat cam portion of the operation shaft, and is displaced according to the rotation of the operation shaft. The return plunger is a cylindrical shape that houses at least the metal portion made of sintered metal or nitridized metal on the sliding surface, and the biasing member for return bias. The part is integrated with a resin part made of resin.

  According to this embodiment, the return plunger that is in sliding contact with the flat cam portion of the operation shaft by the rotation of the operation shaft to which the operation lever is attached, the metal portion made of sintered metal or nitriding metal, and the resin portion Therefore, the cost can be reduced as compared with a return plunger that is entirely made of sintered metal.

  (7) In the embodiment of the above (6), the sliding component has a sliding surface that comes into sliding contact with the flat cam portion of the operation shaft, and is displaced according to the rotation of the operation shaft. The actuating plunger includes a metal portion made of sintered metal or nitrided metal at least on the sliding surface, and an elastic member for absorbing excessive displacement of the actuating plunger. The cylindrical part which accommodates is integrated with the resin part which consists of resin.

  In this embodiment, by rotating the operating shaft to which the operating lever is attached, the operating plunger that is in sliding contact with the flat cam portion of the operating shaft is divided into a metal portion made of sintered metal or nitriding metal and a resin portion. Since the structure is integrated, the cost can be reduced as compared with the operating plunger that is entirely made of sintered metal.

  As described above, according to the present invention, at least the sliding surface is made of a sintered metal or a metal obtained by nitriding the surface, but the other parts are made of resin and integrated, so that the sliding part The cost can be reduced as compared with the case where the whole is made of sintered metal.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  In this embodiment, description will be made by applying the present invention to a limit switch as an apparatus having sliding parts.

  FIG. 1 shows a longitudinal side view of a limit switch according to the present invention, FIG. 2 shows an enlarged longitudinal sectional view of the main part thereof, and FIG. 3 shows an exploded perspective view thereof.

  In the limit switch 1 of this embodiment, as shown in FIG. 1, a head case 5 provided with an operation lever 4 so as to be swingable is connected to an upper end of a switch case 3 in which a switch body 2 is housed and connected and fixed. Configured.

  The switch case 3 is formed in a box shape configured such that the front surface is opened and the cord can be pulled out from the lower end, and the switch body 3 incorporated from the front opening 6 is fixed to the case inner surface with screws. The front opening 6 is closed by a removable front cover (not shown).

  An operation shaft 7 for operating the switch is rotatably supported on the head case 5, and the operation lever 4 is connected and fixed to the projecting end of the operation shaft 7. A roller 8 that comes into contact with a dog, a cam or the like provided in the mechanical device is provided at the tip of the operation lever 4.

  The portion of the operation shaft 7 in the head case 5 is a flat cam portion 7a that is cut out flat, and a return plunger 10 as a sliding component that is pressed against the upper surface of the operation shaft 7 by a spring 9 is slidable up and down. Equipped to case 5.

  In addition, an operation plunger 11 as a sliding component that can be slid up and down is in contact with the lower surface of the flat cam portion 7a. This actuating plunger 11 is equipped with a movable member 13 that is vertically displaceable within a certain range and is slid to the lower limit by an internal spring 12, and a contact bolt 14 that is screwed into the lower end of the movable member 113 is connected to a switch. It directly acts on the operation projection 2 a of the main body 2, and is configured to absorb the difference between the stroke of the operation projection 2 a and the stroke of the actuating plunger 11 by the backward displacement of the movable member 13. An O-ring 19 is attached to the operation shaft 7 near the operation lever 4, and an O-ring 20 is attached between the head case 5 and the main body case 3.

  In a free state in which no external force acts on the operation lever 4, as shown in FIGS. 1 and 2, the flat bottom end surface of the return plunger 10 is urged and pressed against the top surface of the flat cam portion 7a. Is stably held in the neutral position, and the actuating plunger 11 is brought into contact with the lower surface of the flat cam portion 7a. When the operating shaft 7 receives a rotating action from this neutral state, the operating shaft 11 rotates against the return action by the spring 9 as the biasing member, so that the actuating plunger 11 is moved by the lower surface of the flat cam portion 7a. When it is slid downwards against the urging force, the operation projection 2a is pushed in to operate the built-in switching mechanism of the switch body 2, and when the rotational operation force applied to the operation shaft 7 is released, the operation is resumed. The operation shaft 7 is urged and rotated to the original neutral position by the pressing action of the plunger 10 on the flat cam portion 7a, and the operating plunger 11 is also slid back to the original position.

  When the operation shaft 7 is rotated, as shown in FIG. 5 described above, one edge of the flat cam portion 7a and the lower surface of the return plunger 10 slide in local line contact, The other edge of the flat cam portion 7a and the upper surface of the actuating plunger 11 are in local line contact and slide.

  In this embodiment, in order to reduce the cost of the limit switch, the return plunger 10 and the actuating plunger 11 are configured as follows.

  That is, the return plunger 10 is configured by integrating a bottomed cylindrical resin portion 15 that houses the spring 9 and a metal portion 16 made of a substantially disc-shaped sintered metal that is in sliding contact with the flat cam portion 7a. Has been. The return plunger 10 is integrated by press-fitting the shaft portion 16 a of the metal portion 16 into the central hole 15 a at the bottom of the resin portion 15. The resin portion 15 is made of, for example, nylon resin.

  On the other hand, the actuating plunger 11 includes a bottomed cylindrical resin portion 17 that houses an internal spring 12 as an elastic member, and a sintered metal that is attached to the upper end of the resin portion 17 and is in sliding contact with the flat cam portion 7a. The metal part 18 made of is integrated and configured. The metal portion 18 has bent portions 18a and 18a that are bent so that both ends of the elongated plate-like body face each other at substantially right angles, and groove portions 17a and 18a formed on both sides of the upper end of the resin portion 17 therebetween. 17a is fitted and integrated. The resin portion 17 is made of, for example, nylon resin.

  As described above, the return plunger 10 and the actuating plunger 11 are composed of the metal portions 16 and 18 made of sintered metal, while the remaining portion is a sliding surface that is in sliding contact with the flat cam portion 7a. Since it consists of resin, such as nylon resin, cost can be reduced compared with the prior art example which comprises the whole with a sintered metal.

  The metal portions 16 and 18 may be a metal obtained by nitriding the surface of a metal such as stainless steel, for example, instead of the sintered metal.

  Further, the metal portions 16 and 18 and the resin portions 15 and 17 may be integrated by insert molding.

  In the above-described embodiment, the description is applied to the limit switch. However, the present invention is not limited to the limit switch, and may be applied to other devices including sliding parts.

  The present invention is useful for limit switches and the like.

It is the side view which carried out the longitudinal section of the limit switch concerning the present invention. It is the longitudinal cross-sectional view which expanded the principal part of FIG. It is a disassembled perspective view of the principal part of FIG. It is sectional drawing of the principal part of the limit switch of a prior art example. It is a figure where it uses for operation | movement description.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lit switch 2 Switch body 4 Operation lever 5 Head case 7 Operation shaft 10 Returning plunger 11 Actuating plunger 15, 17 Resin part 16, 18 Metal part

Claims (7)

  A sliding component characterized in that at least a sliding surface is formed by integrating a metal portion made of sintered metal or nitriding metal and a resin portion made of resin.   The sliding component according to claim 1, wherein the sliding surface is in sliding contact with a flat cam portion provided on the rotation shaft.   The sliding component according to claim 1, wherein the resin portion has a cylindrical portion that accommodates the component therein.   The sliding component according to any one of claims 1 to 3, wherein the metal portion and the resin portion are integrated by press-fitting or insert molding.   An apparatus comprising the sliding component according to any one of claims 1 to 4. By swinging an operation lever attached to the projecting end of the operation shaft, the operation shaft is rotated against a return urging force to operate a built-in switch,
The sliding component has a sliding surface that is in sliding contact with the flat cam portion of the operation shaft, and is displaced according to the rotation of the operation shaft and is a return plunger that urges the operation shaft to return. ,
The return plunger is formed by integrating at least the metal portion made of sintered metal or nitrided metal with the sliding surface and the resin portion made of resin with the cylindrical portion containing the urging member for return urging. The apparatus according to claim 5. The sliding component has a sliding surface that is in sliding contact with the flat cam portion of the operation shaft, and is an actuating plunger that is displaced according to the rotation of the operation shaft and operates the switch.
The actuating plunger has a cylindrical portion that houses at least a metal portion made of a sintered metal or a nitrided metal on the sliding surface and an elastic member for absorbing excessive displacement of the actuating plunger. The apparatus of Claim 6 which integrated the resin part which becomes.

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