JPH0642138Y2 - Gasket positioning device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket positioning device.

[0002]

2. Description of the Related Art For example, it is well known that a metal gasket formed by laminating thin metal plates is used as a gasket for sealing a joint surface between a cylinder body and a cylinder head of an internal combustion engine. The metal gasket seals by utilizing the elastic force of beads or wire rings. That is, a bead surrounds the periphery of a sealing hole such as a cylinder hole provided in a thin metal plate and projects in a cross-sectional shape such as a corrugated shape. Sealing is performed by utilizing the elastic force of the wire ring arranged in. In order to integrate the wire ring with the gasket body made of a metal plate, the metal plate is folded back around the periphery of the seal hole or assembled with a grommet made of a metal plate.

By the way, for example, the head gasket of an internal combustion engine has a problem that the cylinder hole may interfere with the piston unless it is accurately arranged on the joint surface. As described above, as a means for accurately positioning the gasket, conventionally, a plurality of positioning pins (dowel pins) are planted in a member that is on the lower side during assembly, such as a cylinder body, and the positioning pins are inserted into the gasket. By providing a positioning hole (dowel hole) for insertion and inserting the positioning hole into the positioning pin, the gasket is arranged at the correct position on the joint surface. At that time, the diameter of the hole,
It has been conventionally practiced to make the size a little larger than the pin diameter within the tolerance range to facilitate insertion and improve the assembly work efficiency.

[0004]

By the way, the positioning pin as a whole has a dowel shape slightly protruding from the joint surface. Moreover, as described above, since the conventional positioning hole is made larger than the positioning pin, there is a problem that the gasket easily comes off from the pin. Further, when it is composed of a large number of members such as an internal combustion engine and is mass-produced, generally, the assembly work is performed on an assembly line. The assembly line is configured to move the machine being assembled to the work position of the next step after each assembly step. The head gasket is also assembled to the internal combustion engine on such an assembly line. However, if the cylinder body on which the gasket is mounted shakes during the next process, the gasket may come off the positioning pin. In particular, in a V-type engine in which the deck surface on which the head gasket is placed is inclined, the positioning hole tends to come off the positioning pin.

Moreover, in the automatic assembly line, it is automatically checked whether or not the parts are arranged at the proper positions. In this case, if the head gasket is out of the normal position or has fallen off, the work of returning it to the normal position becomes troublesome. Therefore, when the V-type engine is assembled on the automatic assembly line, if the head gasket is easily disengaged from the positioning pin, the assembly line may often stop.

Therefore, the present invention provides a gasket positioning device in which the positioning hole of the gasket is easily fitted to the positioning pin that is erected on the joint surface, and the once-fitted gasket is prevented from coming off from the pin. The purpose is to do.

[0007]

In order to achieve the above object, the structure of a gasket positioning device of the present invention is such that a plurality of gasket positioning pins are erected on a lower member on which the gasket is placed, and at least 1 A neck with a reduced diameter is formed between the tip of the two positioning pins and the body, and the tip side of the neck is extended to the side of the positioning pin to form an overhang, and a positioning hole is formed in the gasket. When the gasket is placed on the joint surface and the gasket moves to the tip side of the positioning pin, the peripheral edge of the positioning hole enters the neck portion and is caught by the overhang portion.

The shape of the neck is not particularly limited, but it should be formed in a groove shape extending in the circumferential direction of the positioning pin and having a bottom with a predetermined width in the axial direction of the pin, particularly a groove having a U-shaped cross section. You can By providing a predetermined width in the pin axis direction, the gasket component plate can be sufficiently fitted into the neck portion. Further, the protruding portion may be discontinuous in the circumferential direction of the positioning pin, that is, may be partially protruded, but it is normally protruded continuously. Further, the projecting portion may be formed in a spiral shape. Further, the joint surface side of the neck portion may be formed into a conical surface shape toward the peripheral surface of the positioning pin. The inclined surface widens the inlet so that the peripheral edge of the positioning hole easily enters the groove, and the gasket component plate in the groove easily slides on the inclined surface and returns to the original position.

The gasket of the present invention can be applied to all gaskets, but when it is applied to a metal laminated gasket, the gasket positioning plate of the gasket arranged at a position facing the body portion of the positioning pin has a gasket positioning hole. When the gasket is placed on the joint surface, when the gasket moves to the tip side of the positioning pin on any one of the gasket constituent plates arranged on the joint surface side from the overhang portion,
It can be carried out by providing a pin hole that can be easily hooked on the projecting portion.

The part where the positioning pin is provided is not particularly limited. For example, a member for joining via a gasket may be provided coaxially with a bolt for tightening, and a hole for inserting the bolt may be opened in the positioning pin, or it may be provided at a dedicated position separately. When an external force acts on the gasket and the gasket is disengaged from the positioning pin, in most cases, the joint surface is inclined, and a force that intersects the axial direction of the positioning pin acts on the gasket. Therefore, for example, even when the pin hole is larger than the protruding portion, such as a positioning hole, the peripheral edge of the pin hole is caught in the protruding portion,
The gasket is prevented from coming off the locating pin. The pin hole that prevents the pin from coming out of the projecting portion can be a positioning hole or a hole other than the positioning hole.

The object to which the present invention is applied is not particularly limited, and can be applied to any case where the gasket is accurately positioned and placed on the lower member. For example, it can be effectively applied to a case where a gasket is attached to a flange of a pipe which is attached in the lateral direction. In this way, when the gasket mounting flange is arranged in the vertical direction, it should be understood that the lower member on which the gasket is mounted refers to the flange provided with the positioning pin.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings by an embodiment using a metal laminated gasket.
The metal laminated gasket (hereinafter simply referred to as a gasket) used in the first embodiment shown in FIGS. 1 and 2 is a head gasket of a multi-cylinder internal combustion engine (not shown) and has a cylinder hole Hc.
A plurality of bolt holes Hb are provided around, and water holes Hw, oil holes Ho, etc. are provided at predetermined positions, respectively, and further, at two locations (one location is not shown) on the diagonal line of the gasket 1. A positioning hole Hd is provided coaxially with the bolt hole Hb. As shown in FIG. 2, the gasket 1 is composed of three metal plates that substantially cover the entire area of the gasket 1, that is, an upper plate 2, a middle plate 4, and a lower plate 6, and the cylinder hole Hc , A bead (not shown) for sealing the water hole Hw and the oil hole Ho is provided in the middle plate. Reference numeral 8 in FIG. 1 indicates that the lower plate 6 is a cylinder hole Hc.
It is a folded-back portion that is folded back on the upper plate 2 at the peripheral edge of, and combustion gas is prevented from entering between the laminated plates 2, 4, and 6.

As shown in FIG. 2, the positioning pin 12 erected in the cylinder body 10 which is the lower member of the gasket 1 is projected above the gasket 1 and a head bolt (not shown) is attached. It is a cylindrical member having a hole 14 penetrating therethrough. Then, between the body portion 16 of the positioning pin 12 and the chamfered tip end portion 18 of the positioning pin 12, a neck portion 19 having a groove shape with a U-shaped cross section is formed in the circumferential direction of the pin, and the neck portion 19 is formed. A side wall (22) on the tip side is cut up at a right angle (horizontal direction in the drawing) with respect to the peripheral surface of the body (16) to form an overhanging portion (20).

The positioning hole Hd is formed in the lower plate 6 (FIG. 2), and the pin hole 24 of the middle plate 4 has a larger diameter than the positioning hole Hd. The width of the neck portion 19 (groove width in this embodiment)
Is wider than the thickness of the lower plate 6, and the peripheral edge 26 of the positioning hole Hd (FIG. 1) easily fits into the neck portion 19, the peripheral edge 26 is caught by the overhanging portion 20, and the gasket 1 is prevented from coming out of the positioning pin 12. I was made to do it. Further, the hole diameter Dd of the positioning hole Hd is set to a value equal to or larger than the diameter Dp of the positioning pin 12, but equal to or smaller than the tolerance Δ required for positioning the gasket (Dd ≦ Dp + Δ), as in the conventional case. Hole 28 on the upper plate 2
Is larger than the positioning pin 12 as long as it does not interfere with the positioning pin 12. In addition, in this embodiment, FIG.
The portion indicated by reference numeral 29 was used as a positioning portion for a cylinder head (upper member) (not shown) mounted on the gasket 1. Further, in the case shown in FIG. 2, the hole 28 is set to the positioning hole Hd.
Can also be

Now, as shown in FIG. 2, when the positioning hole Hd of the gasket 1 is normally fitted to the positioning pin 12, an unexpected external force acts and the gasket 1 moves from the joint surface 30 of the cylinder body 10. It is assumed to be lifted (not shown). Such external force is usually applied to the gasket 1 on the joint surface.
Includes component force in the direction parallel to 30. Therefore, any part of the peripheral edge 26 of the positioning hole Hd (on the left side in FIG. 3) fits into the neck portion 19 and is caught by the overhanging portion 20,
The positioning hole Hd can be prevented from coming off the positioning pin 12. A stud bolt (not shown)
Even when using, the gasket 1 cannot be positioned unless the positioning pin 12 shown in FIG. 2 is attached around the stud bolt.

FIG. 3 is a modification of the first embodiment, in which the neck 19
The side wall 32 of the cylinder body 10 side is formed into a truncated cone-shaped inclined surface to increase the opening width. This way, the positioning holes
The edge 26 of the Hd fits easily into the neck 19 and the locating pin
The effect of preventing protrusion from 12 is improved, and the peripheral edge 26 easily slides down the slope, so that it is easy to return to the original position. Each of the gaskets 1 described above is composed of three plates, but the present invention is not limited to this, and can be implemented with any number of laminated layers required for the gasket 1.

[0017]

As described above, since the gasket positioning device of the present invention is configured, the gasket can be accurately positioned and placed on the lower member such as the cylinder body, and the bolt can be mounted. If the member suddenly moves or tilts before tightening with, the positioning hole engages with the overhanging portion of the positioning pin and prevents the gasket from coming off the positioning pin. Positioning of an upper member such as a cylinder head can also be used, and assembly work efficiency can be improved. Therefore, the present invention can be applied to, for example, an automatic assembly line in which the joining surface of the lower member on which the gasket is mounted is inclined, such as a V-type engine, or when the gasket is misaligned, it is difficult to repair it. This is effective in preventing the gasket from being displaced.

[Brief description of drawings]

FIG. 1 is a partial plan view of a metal laminated gasket used in a gasket positioning device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the essential parts of the gasket positioning device of the first embodiment.

FIG. 3 is a cross-sectional view showing a modified example of the first embodiment.

[Explanation of symbols]

1 Gasket (Metal Laminated Gasket) 2 Upper Plate (Gasket Composition Plate) 4 Middle Plate (Gasket Composition Plate) 6 Lower Plate (Gasket Composition Plate) 10 Cylinder Body (Lower Member) 12 Positioning Pin 16 Body 18 Tip 19 Neck 20 Overhang 26 Peripheral 30 Bonding surface Hd Positioning hole

Claims (5)

[Scope of utility model registration request] 1. A plurality of positioning pins for the gasket are erected on a lower member on which the gasket is placed, and a neck having a reduced diameter is formed between the tip of at least one of the positioning pins and the body. The tip of the neck is extended to the side of the positioning pin to form a protrusion, and a positioning hole is provided in the gasket.When the gasket is placed on the joint surface, the gasket moves to the tip of the positioning pin. Then, the gasket positioning device in which the peripheral edge of the positioning hole enters the neck portion and is caught by the overhang portion. 2. The gasket positioning device according to claim 1, wherein the neck portion is formed in a groove shape extending in the circumferential direction of the positioning pin. 3. The gasket positioning device according to claim 2, wherein the neck portion is formed in a groove shape having a U-shaped cross section. 4. The gasket positioning device according to claim 1, wherein the joint surface side of the neck portion is formed into a conical surface shape toward the peripheral surface of the positioning pin. 5. A gasket is formed by laminating a plurality of metal plates, and a gasket positioning hole is provided in the metal plate arranged at a position facing the body of the positioning pin, and the gasket is placed on the joint surface. When the gasket is moved to the tip side of the positioning pin, a pin hole is provided on any one of the metal plates arranged on the joint surface side of the overhanging part of the positioning pin so that the pin easily catches on the overhanging part. Claims 1, 2, 3
Or the gasket positioning device of 4.