JPH0741890Y2 - Mounting structure for intake manifold, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of Invention] (Industrial field of application) The present invention is to mount and fix a mounted body such as an intake manifold to a mounting body such as a cylinder head constituting an engine through an elastic gasket. The present invention relates to a mounting structure for the purpose of improving the mounting bolt tightening structure.

(Prior Art) An engine body is composed of a crankcase, a cylinder head, and the like, and an intake manifold, an exhaust manifold, and the like are attached and fixed to the cylinder head.
Despite the use of a damping structure in the engine body, it easily vibrates as the engine is driven, and part of it is transmitted to the attached body such as the intake manifold or the exhaust manifold. On the engine body,
Various vibration modes are generated in various directions, and the mounted body having a relatively large surface area receives the vibration from the engine main body to perform its expanding action and expand the vibration noise.

Therefore, in order to damp the vibration transmitted from the mounting body side, which is the engine body, to the mounted body such as the intake manifold, the gasket interposed between these is replaced with an elastic material such as a rubber material to obtain a cushioning effect. The so-called rubber floating structure is often used. However, unless the tightening force of the mounting bolts for mounting and fixing the mounting body to the mounted body is made constant, the pressing force against the elastic gasket is partially different and the airtightness cannot be maintained, or the elastic gasket itself May be crushed.

3 and 4 show a conventional mounting structure.
First, referring to FIG. 3, in the drawing, 1 is a mounting body such as a cylinder head, 2 is a mounted body such as an intake manifold, and a rubber material is provided between the mounting body 1 and the mounted body 2. The elastic gasket 3 made of is interposed. A screw hole 4 is formed in the mounting body 1, and a through hole is formed in the mounted body 2 and the elastic gasket 3 so as to communicate with the screw hole 4.
5,5 are drilled. Reference numeral 6 denotes a mounting bolt, which is inserted into the screw hole 4 through the through holes 5 and 5, and a tip screw portion 6a thereof is screwed into the screw hole 4. A spacer 7 is fitted to the peripheral surface of the stem portion 6b of the mounting bolt 6 with a small gap, and the spacer 7 is interposed between the head 6c of the mounting bolt 6 and the mounted body 2. Will be done. Further, a coil spring 8 is provided between the head portion 6c of the mounting bolt 6 and the mounted body 2, and the coil spring 8 surrounds the portion of the spacer 7 protruding from the mounted body 2.

In this way, by using the spacer 7, the tightening force, which is the screw insertion depth of the mounting bolt 6, becomes constant, and the tightening length L ₀ for the elastic gasket 3 becomes constant. The coil spring 8 applies a constant spring load to the elastic gasket 3 via the mounted body 2 and elastically suppresses the vibration transmitted from the mounting body 1 to the mounted body 2.

FIG. 4 shows a structure in which a desired effect is obtained without using the spacer 7 as shown in FIG. That is, the configuration other than the stem portion 6b ₁ of the mounting bolt 6A to be described later, because it is exactly the same as those shown in FIG. 3, the description applies to the figure is omitted. Since the thread diameter of the threaded portion 6a of the mounting bolt 6A is a condition for setting the axial force of the mounting bolt itself, the thread diameter is the same as that shown in FIG. As shown, the stem portion 6b ₁ of the mounting bolt 6A is large becomes diameter than the screw diameter of the screw portion 6a. The diameter of the stem portion 6b ₁ is substantially the same as the outer diameter of the spacer 7, and is brought into contact with the tip face of the above the mounting member 2. By forming a so-called shoulder pad, the same action as that of the spacer 7, that is, the tightening length L ₀ for the elastic gasket 3 can be set to be the same.

(Problems to be solved by the invention) However, in the structure shown in FIG. 3, it is necessary to manufacture and manage the spacer 7 in order to set the tightening length L ₀ of the mounting bolt 6, which requires a mounting work, which is troublesome. Cost is adversely affected. Further, in order to insert the spacer 7, the attached body 2 must be provided with a through hole 5 having a large diameter. The intake manifold, which is the body 2 to be attached, has a complicated shape with many irregularities as is well known, and there is almost no unnecessary space for further weight reduction. In addition, it is very difficult in terms of design to increase the diameter of the through hole 5.

The spacer shown in FIG. 4 does not require the spacer 7 described above, but a commercially available one cannot be used because the stem 6b ₁ of the mounting bolt 6 has a large diameter. It needs to be newly manufactured and managed, which is time-consuming and adversely affects the cost. Moreover, from where the diameter of the stem portion 6b ₁ is the same as the spacer 7, a large similarly diameter of holes 5 provided in the mounting member 2, a similar problem.

The present invention was made in view of the above circumstances, and the purpose thereof is to set the tightening length of the mounting bolt without using a separate part or a specially manufactured mounting bolt. An object of the present invention is to provide a mounting structure for an intake manifold or the like, which is possible only by partially changing the shape of mounting bolts and contributes to cost reduction in terms of the number of parts and mass productivity.

[Constitution of device]

(Means for Solving the Problems) That is, the present invention is to mount and fix a mounted body such as an intake manifold to a mounting body such as a cylinder head through an elastic gasket, and to provide a screw hole in the mounting body, A through hole is formed in the mounting body and the elastic gasket so as to communicate with the screw hole, a mounting bolt is screwed into the screw hole through the through hole, and the head of the mounting bolt and the mounted body are attached. A coil spring for maintaining a constant pressing force against the elastic gasket is interposed between them, and a projecting portion is integrally projected at the tip of the thread portion of the mounting bolt, and this projecting portion is provided at the tip of the screw hole. It is a mounting structure for an intake manifold or the like characterized in that it is abutted against an abutting hole that is integrally connected to the section.

(Operation) When the threaded portion of the mounting bolt is screwed into the threaded hole of the mounting body, the projecting portion integrally projecting at the tip of the threaded portion is continuously connected to the tip end of the threaded hole. It abuts the end face of the hole, so that the tightening length of the mounting bolt is always constant and the spring load of the coil spring is kept constant.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In the figure, 10 is a mounting body such as a cylinder head, 11 is a mounted body such as an intake manifold, and an elastic gasket 12 made of a rubber material is interposed between the mounting body 10 and the mounted body 11. . The mounting body 10 is provided with a screw hole 13 having the same screw diameter and the same length as the conventional one, and the tip end of the screw hole 13 has a diameter smaller than the screw diameter and has a flat tip surface for abutting. The holes 14 are arranged in series. The total depth L ₁ of the screw hole 13 and the butting hole 14 from the surface of the mounting body 10 needs to be set accurately. Through holes 15, 15 are formed in the attached body 12 and the elastic gasket 12 at positions communicating with the screw holes 13. These through holes 15,
The diameter of 15 is the minimum diameter necessary for inserting the stem portion 16b of the mounting bolt 16 described later. That is, the stem portion 16b of the mounting bolt 16 is the screw portion 1 that is screwed into the screw hole 13 described above.
The commercially available bolt which has the same diameter as 6a and is usually used may be used as it is. However, the protrusion 17 is integrally connected to the tip of the screw portion 16a. The protruding portion 17 has a diameter that allows it to be inserted into the abutting hole 14, and its tip surface is also flat. In actual production, the tip of a commercially available long bolt may be ground, the screw may be dropped to form a circular shape, and the tip surface may be flat. However, it is the total length of the mounting bolt 16, from the tip of the protrusion 17 to the head 16
The length up to c must be set accurately. A coil spring 18 is interposed between the head portion 16c of the mounting bolt 16 and the mounted body 11 and the mounting bolt 16
The stem portion 16b protruding from the attached body 11 is bent.

Then, the elastic gasket 12 and the mounted body 11 are placed on the mounting body 10, and the through holes 15 and 15 are communicated with the screw holes 13. Then, attach the coil spring 18 to the stem 16b of the mounting bolt 16.
Is inserted and inserted into the through holes 15 and 15 and the screw hole 13 from the tip protruding portion 17, and the head portion 16c is further rotated to screw the screw portion 16a into the screw hole 13. The protrusion 17 reaches the abutment hole 14 through the screw hole 13 by a predetermined amount of screw insertion, and when further screwed, the tip end surface of the protrusion 17 abuts the end face of the abutment hole 14. The mounting bolt 16 cannot be screwed any further, and therefore the tightening length L ₀ is automatically set. No matter which part the mounting bolt 16 is tightened, the spring load of the coil spring 18 on the elastic gasket 13 is always constant, and a uniform pressing force is obtained against the elastic gasket 12 and the coil spring 18 is attached to the mounted body 11. Elastically suppress the transmitted vibration.

The mounting bolt 16 may be manufactured by processing the tip of a commercially available mounting bolt that is normally used, and does not need to be newly manufactured. Also,
Since the diameters of the through holes 15 and 15 can be such that the stem portion 16b of the mounting bolt 16 can be inserted, the diameter can be smaller than that of the conventional one, and the restriction on the design can be lessened.

[Effect of device]

As described above, according to the present invention, the tightening length is always made constant without using nerves in the screwing amount of the mounting bolt, and the spring load of the coil spring is set to a constant value to uniformly press the elastic gasket. The force is obtained and the vibration transmitted from the mounting body to the mounted body is reliably suppressed. In addition, the above mounting bolts do not require a slight modification on the commercially available ones that are usually used, and have no adverse effect on the cost.The diameter of the through hole drilled in the mounted body allows the stem of the mounting bolt to be inserted. With such a small diameter, there are various effects such as not being restricted by design.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention.
FIG. 1 is a vertical sectional view of an intake manifold mounting structure, FIG. 2 is an enlarged vertical sectional view of a part thereof, FIGS. 3 and 4 show different conventional examples of the present invention, and FIG. FIG. 4 is a vertical cross-sectional view of the mounting structure of the manifold, and FIG. 10 ... Mounting body (cylinder head), 11 ... Mounted body (intake manifold), 12 ... Elastic gasket, 13 ... Screw hole, 15 ... Through hole, 16 ... Mounting bolt, 16c (of mounting bolt)
Head, 18 ... Coil spring, 16a ... (of mounting bolt)
Screw part, 17… Projection part, 14… Abutting hole.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area F16B 35/00 M F16F 15/067

Claims (1)

[Scope of utility model registration request] 1. A mounting body, such as an intake manifold, is mounted and fixed to a mounting body, such as a cylinder head, via an elastic gasket, and the screw hole provided in the mounting body is communicated with the screw hole. Through holes formed in the mounting body and the elastic gasket, mounting bolts screwed into the screw holes through the through holes, and the heads of the mounting bolts and the mounted body. A coil spring for maintaining a constant pressing force against the elastic gasket, and a projecting portion integrally projecting at the tip of the thread portion of the mounting bolt and a continuous connection to the tip portion of the screw hole. And the abutment hole for holding the spring load of the coil spring constant by making the tightening length of the mounting bolt constant by abutting the end surface of the protruding portion of the mounting bolt. Mounting structure, such as the intake manifold, characterized.