JPH0630458U - Washer - Google Patents

Abstract

(57) [Abstract] [Purpose] With a simple structure, when mounting a head cover on a cylinder head, it is intended to reliably transmit the stress due to tightening of bolts and to improve the sealing performance by packing. [Structure] The area of the contact surface of the washer rubber integrally joined to the annular metal plate that contacts the head cover is equal to or greater than the tightenable area per bolt of the packing. The fastening force generated by tightening the bolts can be effectively transmitted to the seat surface of the washer of the head cover, and as a result, the packing sandwiched between the cylinder head and the head cover can be reliably deformed. Therefore, the airtightness between the cylinder head and the head cover can be improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of the structure of a washer that is tightened together for the purpose of stress distribution and detent when tightening bolts.

[0002]

[Prior art]

 Conventionally, when bolts are tightened together, they are tightened together for the purpose of stress distribution and detents.The washer structure is made by bonding a steel plate of the same shape to an elastic material such as annular rubber, or by baking. It is common that it is formed as a laminated integral structure.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional one, in the case where the elastic material such as rubber and the plate body of the steel plate are bonded or baked to form a washer as a laminated integrated structure, for example, after packing is clamped to the cylinder head, When the head cover and bolts are used to fix the head cover, as the bolts are tightened, the stress generated by tightening the bolts is transmitted to the packing through the elastic rubber that forms the washer's laminated structure. At this time, compared with the surface area of the upper surface of the annular rubber that constitutes the washer, the surface area of the upper surface of the packing that is sandwiched between the head cover and the cylinder head and fixed by the bolt with the hermeticity between the head cover and the cylinder head is larger than the surface area of the upper surface. Since it becomes smaller, the stress caused by tightening the bolt The distribution is not evenly distributed, and only the annular rubber that constitutes the washer is compressed rather than the compression of the packing, and the packing is not sufficiently fixed to maintain its tightness. There is a point that causes leakage.

When the tightening force by the bolts is increased in order to prevent engine oil or the like from leaking due to insufficient stress distribution by the annular rubber forming the washer, the annular rubber forming the washer is increased. If the bolts are damaged, the stress generated by tightening the bolts cannot be transmitted sufficiently, and problems such as falling off due to a decrease in bolt mounting strength may occur.

In order to effectively transmit the stress caused by tightening the bolts, it is possible to increase the area of the seat surface of the washer in the head cover, but in the limited space such as the engine room, the design is not possible. It is possible that the seat surface of the washer cannot be enlarged.

[0006] Therefore, the present invention is intended to improve the drawbacks of the above-mentioned conventional ones, and to securely fix them with bolts with a simple structure.

[0007]

[Means for Solving the Problems]

 Therefore, in a washer rubber that is integrated with an annular metal plate, the area of the contact surface of the washer rubber that abuts the head cover has a plurality of locking holes arranged in the packing that is interposed between the head cover and the cylinder head. The area is equal to or more than the area that can be tightened per bolt passing through.

[0008]

[Action]

 With the above configuration, when the head cover holds the packing and is to be fixed to the cylinder head, by tightening this washer together with the bolt, the tightening force generated by tightening the bolt is By expanding the washer rubber that is integrally joined to the annular metal plate that makes up the structure in the circumferential direction, the area that can be fixed with one bolt that penetrates the multiple locking holes arranged in the packing Since the area of the contact surface of the washer rubber that expands in the circumferential direction with the head cover is equal to or greater than that, the tightening force of the bolt is effectively applied to the seat surface of the head cover. It becomes possible to transmit, and the packing that is interposed between the cylinder head and the head cover can be easily deformed. While preventing loosening, to maintain the sealing property can be firmly fixed.

Further, even if the seat area of the washer in the head cover cannot be effectively secured, by tightening the bolt, the tightening force generated by tightening the bolt gradually forms the washer. The washer rubber that will be deformed will follow the shape of the head cover, and this deformation of the washer rubber along the shape of the head cover will allow it to be fixed with a single bolt that penetrates multiple locking holes arranged in the packing. The area of the contact surface of the washer rubber to the head cover is equal to or larger than the area of the head cover, so that the tightening force by tightening the bolts can be transmitted effectively and reliably to the seat surface of the head cover. As a result, the packing sandwiched between the cylinder head and the head cover is sufficiently deformed to improve the airtightness. Can be raised.

[0010]

【Example】

 The invention will be further described with reference to the embodiments shown in the drawings. (1) is a head cover mounting part having a washer (2) according to an embodiment of the present invention, and this head cover mounting part (1) is a cylinder head (3) and a cylinder head (3) sealed with this cylinder head (3). Head cover (5) fixed via packing (4) which is sandwiched to maintain the property, and further includes a bolt (6) for integrally fixing the cylinder head (3) and the head cover (5). .

The washer (2) is a bolt for integrally fixing the cylinder head (3) and the head cover (5) via the packing (4) and inserting the bolt through hole (9) of the washer (2). This washer (2) is fastened together with (6), and this washer (2) contacts the head cover (5) of this washer rubber (8) in the washer rubber (8) which is integrated with the annular metal plate (7). The area (S1) of the abutting surface to be brought into contact with the bolt (6) penetrating through a plurality of locking holes (10) arranged in the packing (4) interposed between the head cover (5) and the cylinder head (3). ) The area is equal to or more than the area (S2) that can be tightened by one piece.

Since the present invention has the above-mentioned structure, when the head cover (5) is sandwiched between the cylinder head (3) and the packing (4) and is fixed to the cylinder head (3), By tightening the washer (2) together with the bolt (6), the bolt (6) is passed through the bolt through hole (9) of the washer (2) and the locking hole (10) of the packing (4), and the cylinder head ( The tightening force generated by tightening into 3) expands the washer rubber (8) that is integrally joined to the annular metal plate (7) forming the washer (2) in the circumferential direction, and the packing (4) The washer rubber (8) that expands in the circumferential direction is applied to the head cover more than the area (S 2) that allows tightening per bolt (6) that penetrates a plurality of locking holes (10). Contact Since the surface area (S1) is the same or larger, the fastening force of the bolt (6) can be effectively transmitted to the seat surface (11) of the head cover (5). The fastening force effectively transmitted to the seat surface (11) of the head cover (5) via the washer rubber (8) forming the washer (2) is the same as that of the cylinder head (3). This facilitates tight fastening with the head cover (5) and allows the packing (4) interposed between them to be easily deformed, and prevents the bolt (6) from loosening due to vibration, while also preventing the cylinder head (3) from being loosened. ) And the head cover (5) can be firmly fixed while maintaining the airtightness.

Even if the seat area (11) of the washer (2) in the head cover (5) cannot be effectively secured, the bolt (6) can be tightened to tighten the bolt (6). The washer rubber (8) that forms the washer (2) gradually deforms due to the tightening force generated by tightening the washer (2) in close contact with the head cover (5). Due to the deformation of the head cover (5) along the shape of the head cover (5), the area (S2) that can be tightened per bolt (6) that penetrates the plurality of locking holes (10) arranged in the packing (4) Since the area (S1) of the contact surface of the washer rubber (8) with the head cover (5) is equal to or more than that, the fastening force by tightening the bolt (6) is effective and reliable. To the head It can be transmitted to the seating surface (11) of the cover (5), and as a result, the packing (4) sandwiched between the cylinder head (3) and the head cover (5) is sufficiently deformed so that the cylinder head ( The hermeticity between 3) and the head cover (5) can be improved.

If the seat surface (11) of the washer (2) cannot be effectively secured in the head cover, replace the washer rubber (8) forming the washer (2) with the washer rubber (8). Is clamped by a metal plate (7) having the same shape as the annular metal plate (7) integrally joined together, so that the fastening force of the bolt (6) can be effectively transmitted. Further, the washer (2) is provided with a flange (12) so that it can be locked to the edge of the head cover (5) (Fig. 3), so that the head cover (5) can be attached to the cylinder head (3). ) Is fixed, the bolt (6) goes through the bolt through hole (10) of the washer (2 ′) and is rotated together with the bolt (6) of the washer (2) when rotated. Can be prevented.

FIG. 4 shows a fixing plate (13) according to a second embodiment of the present invention, which is a packing (4) sandwiched between the head cover (5) and the cylinder head (6). It has the same shape as the above, and a metal plate (14) and a fixing plate gum (15) having the same shape are integrally joined. The fixing plate (13) fixes all the head covers (5) with bolts (5). By integrating the washer (2) that is fastened together with 6), the area (S1) of the contact surface of the fixing plate (13) that comes into contact with the head cover (5) is reduced to the bolt in the packing (4). (6) Since the tightening area per bolt (S2) can be made equal or more, the fastening force of the bolt (6) can be effectively applied to the head cover (5). It is possible to ensure the transmission and ensure a sufficient hermeticity, and at the same time, improve the workability of attaching the head cover (5) to the cylinder head (3).

[0016]

[Effect of device]

 As described above, the area (S1) of the contact surface of the washer rubber that composes the washer that is used together with the bolt when fixing the head cover to the cylinder head is the bolt 1 in the packing interposed between the cylinder head and the head cover. By making the tightening area (S2) equal or larger than the tightening area per book, the tightening force generated by tightening the bolts can be effectively transmitted to the cylinder head, and the cylinder head and the head cover can be connected. Since it is possible to reliably deform the packing that is interposed between the cylinder head and the head cover, it is possible to reliably improve the sealing performance between the cylinder head and the head cover. It has an excellent effect that it can be surely prevented.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a head cover mounting portion including an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a washer.

FIG. 3 is an enlarged perspective view of a washer having a collar portion.

FIG. 4 is an enlarged perspective view of a fixing plate according to a second embodiment of the present invention.

[Explanation of reference symbols] 1 head cover mounting part 2, 2'washer 3 cylinder head 4 packing 5 head cover 6 bolt 7 metal plate 8 washer rubber 9 bolt through hole 10 locking hole 11 seat surface 12 collar part 13 fixing plate 14 metal plate 15 Fixing plate rubber

Claims (1)

[Scope of utility model registration request] 1. A washer rubber united with an annular metal plate, wherein a plurality of contact surface areas of the washer rubber abutting against a head cover are arranged on a packing interposed between the head cover and the cylinder head. A washer that has an area equal to or greater than the tightening area per bolt that penetrates the stop hole.