JPH0627852Y2 - Resin member mounting structure using bolts - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a mounting structure for fixing a resin member to a predetermined assembly member by a bolt, and more particularly, a mounted portion of the resin member is fixed to the assembly member. The present invention relates to a mounting structure for firmly fixing bolts in a state of separating the gap.

(Background Art) When a resin member is bolted to a predetermined assembly member at its attached portion, a female screw portion that can be screwed with a bolt is provided on the assembly member, while a bolt insertion hole is provided at the attached portion of the resin member. A bolt is screwed onto the female thread portion of the assembly member while being inserted into the bolt insertion hole so that the mounted portion of the resin member is pinched between the head of the bolt and the assembly member. It is generally done.

However, in such a mounting structure, when a predetermined gap is inevitably formed between the mounting member and the mounted portion of the resin member due to the reasons of the mounting structure, etc. There is a problem that unnecessary stress is caused in the mounted portion of the resin member by the amount of eliminating the gap, and the resin member is damaged by the stress, or its durability is reduced. .

For example, in recent years, attempts have been made to resinize a reservoir tank of a type directly above a pump (hereinafter simply referred to as a power steering tank) used in a hydraulic system of a power steering of an automobile. When a mounting structure similar to that of a conventional metal power steering tank is adopted as the above, that is, as shown in FIG. 4, a plurality of mounting brackets 6 are provided so as to surround the vane pump 4 from the resin tank main body 2. To extend
When the tank main body 2 is bolted to the vane pump 4 in the mounting brackets 6, the tank main body 2 is mounted between the mounting brackets 6 and the vane pump 4 so that the tank main body 2 can be assembled to the vane pump 4. , It is necessary to form a predetermined gap C as shown in FIG.

Therefore, when the conventional bolt mounting structure of the resin member is adopted in mounting the power steering tank to the vane pump, as shown in FIG. 6, by tightening the bolt 9 to the female screw portion 8 of the vane pump 4,
The clearance between the vane pump 4 and the mounting bracket 6 is deformed so as to eliminate the clearance C. As a result, stress is caused at the base end of the mounting bracket 6, and the mounting bracket 6 is easily damaged at the base end. However, there is a problem that the durability of the vane pump 4 is significantly reduced.

(Problem to be Solved) The present invention has been made in view of such circumstances, and the problem to be solved is that the mounted portion of the resin member and the assembly member are in the screwed state of the bolt. In the case where a predetermined gap is inevitably formed between the resin member and the attached portion of the resin member without eliminating the gap, that is, without substantially deforming the attached portion of the resin member. In order to provide a mounting structure for a resin member that can be firmly bolted to the assembly member.

(Solution) In order to solve such a problem, in the present invention, a bolt is used as a mounting structure for bolting a resin member to a predetermined assembly member at a mounted portion thereof. A structure in which a screwable nut member is fixed to a mounted portion of a resin member, and a bolt is screwed into the nut member so as to penetrate therethrough and screwed into a female screw portion provided in the assembly member. Was adopted.

(Operation) In such a resin member mounting structure, when the resin member is bolted to the assembly member at the mounted portion, the bolt is screwed into the nut member fixed to the mounted portion of the resin member. In the penetrated state, the bolt is further threaded without applying a large force in the axial direction of the bolt to the mounted part of the resin member. Without substantially changing the relative positional relationship in, that is, in the case where a predetermined gap is formed between the mounted portion of the resin member and the assembly member, without eliminating the gap, The bolt can be screwed into the female thread portion of the assembly member.

Then, in this state, the bolt is further screwed, and the bolt is tightened until it does not screw further due to the contact of the head of the bolt with the mounted portion. Rotation of the bolt in the direction of pulling out is prevented due to the contact, and as a result, the mounted portion of the resin member is attached to the assembly member with an initial gap between it and the assembly member. In contrast, it will be fixedly attached via bolts.

That is, even if a predetermined gap is provided between the attached portion of the resin member and the assembly member, the resin member is attached to the assembly member at the attached portion without deforming the attached portion. Since it can be fixed by bolts, it is possible to satisfactorily avoid the generation of unnecessary stress in the attached portion.

(Example) In order to clarify the present invention more concretely,
An embodiment of the case where the present invention is applied to the mounting of the resin power steering tank of the type directly above the pump used in the hydraulic system of the power steering of an automobile as described above will be described in detail with reference to the drawings.

First, FIG. 1 shows a vane pump 10 as an assembly member.
The mounting state of the resin power steering tank 12 as a resin member is schematically shown. There, 14
Is a tank main body that constitutes the power steering tank 12 together with the tank lid 16, and a plurality of mounting brackets 18 as attached parts are extended from the bottom wall of the tank main body 14 so as to surround the upper portion of the vane pump 10. ing. Then, as shown in FIG. 2, the power steering tank 12 has a plurality of mounting brackets 18 extending from the tank body 14 and is attached to the vane pump 10.
It is fixed to the bolt 20 with.

Here, each mounting bracket 18 corresponding to the formation site of the female screw portion 22 of the vane pump 10 to which the bolt 20 is screwed
A stepped hole 26 having a large diameter portion at a predetermined length portion on the vane pump 10 side is formed in each of the portions in a state of penetrating the mounting bracket 18 in the plate thickness direction. A metal nut 30 having an internal thread portion 28 that can be screwed into the bolt 20 is press-fitted and fixed into the stepped hole 26.

The nut 30 has a structure in which an annular flange 32 is integrally provided at one end of the outer peripheral portion of the nut 30. The outer surface shape of the nut 30 corresponds to the inner surface shape of the stepped hole 26 of the mounting bracket 18. There is. The flange 32 is press-fitted into the stepped hole 26 in a state of contacting the stepped surface of the stepped hole 26. Further, the female screw portion 28 that can be screwed into the bolt 20 is the flange 3 of the inner peripheral portion of the nut 30 here.
It is formed only in a predetermined length portion on the formation end side of 2, and the remaining portion of the inner peripheral portion of the nut 30 is a loose fitting portion 34 having an inner diameter larger than the outer diameter of the bolt 20.

By the way, each mounting bracket 18 of the power steering tank 12
For convenience of mounting the power steering tank 12 on the vane pump 10, as shown in FIG.
The power steering tank 1 is installed at the mounting position for the vane pump 10.
In the state where 2 are arranged, they are provided so as to form a predetermined gap (usually, a gap of about 0.5 to 1 mm): C with the vane pump 10, which is shown in FIG. Thus, here the bolt 20 is threaded into the female thread of the nut 30 with the head 36 abutting against the mounting bracket 18 and its rotation blocked, the gap C being substantially unchanged. The mounting brackets 18 are fixed to the vane pump 10 by being screwed into the portion 28 and the female screw portion 22 of the vane pump 10, respectively, whereby the power steering tank 12 is fixedly attached to the vane pump 10.

That is, when fixing the mounting bracket 18 of the power steering tank 12 to the vane pump 10 with the bolt 20,
First, as shown in FIG. 3, in a state where the power steering tank 12 is arranged at an assembly position with respect to the vane pump 10, the bolt 20 is screwed into the female screw portion 28 of the nut 30, and in this state, the mounting bracket 18 is not deformed. Without applying unnecessary force to the bolt 20 in the axial direction of the bolt 20,
Is threaded onto the female screw portion 22 of the vane pump 10. Then, the bolt 20 is further advanced from this state, and the head 36 of the bolt 20 contacts the mounting bracket 18, and the bolt 20 is tightened to a position where the rotation of the bolt 20 is blocked by the contact.

In this way, as shown in FIG. 2, the bolt 20 is attached to the mounting bracket 18 and further to the vane pump 10 while maintaining the initial gap C between the mounting bracket 18 and the vane pump 10. Therefore, the mounting bracket 18, and thus the power steering tank 12, is fixed to the vane pump 10 without deformation of the mounting bracket 18, that is, without causing stress to the mounting bracket 18. Then, the bolt 20 can be fixedly attached. In FIG. 2, 38 is the head 36 of the bolt 20 and the mounting bracket 1.
It is a washer that is interposed between the and 8.

As described above, according to the mounting structure of the present embodiment, the mounting brackets 18 are mounted on the vane pump 10 while substantially maintaining the initial clearance C between each mounting bracket 18 of the power steering tank 12 and the vane pump 10. Since the bolts can be fixedly fixed, the power steering tank 12 can be fixed to the vane pump 10 without causing stress on the base end of the mounting bracket 18.
The mounting bracket 18 and thus the power steering tank 12 can be prevented from being damaged relatively early by such stress.

Further, according to the mounting structure of this embodiment, the mounting bracket 1
Since 8 is not deformed, it is not always necessary to keep the clearance C between the mounting bracket 18 of the power steering tank 12 and the vane pump 10 as small as possible. In this way, the conditions for forming the mounting bracket 18 are relaxed. Therefore, there is an advantage that the degree of freedom in designing the power steering tank 12 is improved accordingly.

As described above, one embodiment of the present invention has been described in detail. However, this is a literal example, and the present invention is not specifically limited to the above and within the scope of the invention.
It goes without saying that the present invention can be carried out in a mode in which various changes, corrections and improvements are made.

For example, in the above-described embodiment, the nut 30 as the nut member is press-fitted and fixed to the mounting bracket 18 as the mounted portion, but the nut member may be inserted into the mounted portion by an insert molding method or the like. It is also possible to fix it by the method of.

Further, in the above-mentioned embodiment, the example in which the present invention is applied to the installation of the resin power steering tank of the type directly above the pump used in the hydraulic system of the power steering of the automobile to the vane pump has been described. The mounting structure according to the present invention can also be applied to the mounting of the members.

(Effects of the Invention) As is apparent from the above description, according to the mounting structure according to the present invention, even when a predetermined gap is provided between the mounted portion of the resin member and the assembly member, Since the resin member is firmly bolted to the assembly member at the mounted portion without deforming the mounting portion, it is possible to satisfactorily avoid unnecessary stress from being generated in the mounted portion of the resin member by tightening the bolt. Therefore, it is possible to largely prevent the resin member from being damaged or easily damaged by the stress, and to greatly improve the durability of the resin member. Further, since the same effect can be obtained regardless of the size of the gap between the attached portion of the resin member and the assembly member, except when the size of the gap is particularly limited, There is also an advantage that the degree of freedom in designing the resin member can be improved.

[Brief description of drawings]

FIG. 1 is an external view schematically showing an example in which the mounting structure of the present invention is applied to a vane pump of a power steering tank of a type directly above a pump used in a hydraulic system for power steering of an automobile, and FIG. FIG. 3 is an enlarged cross-sectional view of the relevant part. FIG. 3 is a cross-sectional view corresponding to FIG. 2 in a state in which the power steering tank is arranged at the assembly position with respect to the vane pump of FIG. Figures 4, 5 and 6 show
FIGS. 3A and 3B are views corresponding to FIGS. 1, 3, and 2, respectively, for explaining a conventional mounting structure. 10: Vane pump (assembly member) 12: Power steering tank (resin member) 14: Tank body 18: Mounting bracket (attached part) 20: Bolt, 22: Female thread part 30: Nut, 36: Head part

Claims (1)

[Scope of utility model registration request] 1. A mounting structure for bolting a resin member to a predetermined assembly member at a mounting portion thereof, wherein a nut member screwable to the bolt is mounted to the resin member. A resin member using a bolt, which is fixed to an internal threaded portion provided on the assembly member in a state in which the bolt is screwed into the nut member to penetrate the nut member. Mounting structure.