JPH10306736A - Throttle body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a stopper fixing boss of a main body made of a resin from bring deformed by an impact exerted on the stopper. SOLUTION: A throttle body comprises: a main body 1 forming an intake passage 2; a throttle shaft 3 rotatably disposed in the main body 1; and a throttle valve 4 fixed to the throttle shaft 3. The main body 1 is made of a resin, wherein a metallic core 5 is insert-molded to form the intake passage 2 in the vicinity of the throttle valve 4. A stopper fixing boss 10 for fixing a stopper 13 for restricting rotation of the throttle valve 4 is provided in the main body 1. A core bar part 17 capable of fixing the stopper 13 thereto is formed in the core 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a throttle body for an engine.

[0002]

2. Description of the Related Art An example of a conventional throttle body will be described with reference to FIGS. 9 is a partially broken side view, and FIG. 10 is a partially broken front view. As shown in FIG. 10, the throttle body includes a substantially cylindrical body main body 1 forming an intake passage 2, a throttle shaft 3 rotatably provided on the body main body 1, and a throttle body attached to the throttle shaft 3. A throttle valve 4 that can open and close the intake passage 2; The body 1
Is, for example, a resin manufactured by an injection molding method,
A metal core 5 forming the intake passage 2 near the throttle valve 4 is integrally formed by insert molding. Such a throttle body is, for example,
No. 51902.

The throttle shaft 3 is supported by bearings 6 of the core 5 via bearing bushes 61 with both ends protruding from the outer surface of the body 1. A throttle lever 7 is attached to one end (left end in FIG. 10) of the throttle shaft 3 by fastening a fixing nut 8. The throttle lever 7 is provided with an accelerator wire linked to an accelerator pedal (not shown). Further, the throttle lever 7 is provided with a protruding contact piece 14 that can contact a stopper 13 described later.

[0004] A return spring 9 for urging the throttle lever 7 in the fully closing direction is interposed between the throttle lever 7 and the body 1. Further, a boss 10 for attaching a stopper is projected from an outer surface of the body 1. As shown in FIG. 9, a metal screw member 11 having a female screw 12 is provided on the stopper mounting boss 10 by insert molding. A stopper 13 made of a metal screw is screwed to the female screw 12 of the screw member 11. The contact piece 14 of the throttle lever 7 urged in the closing direction of the throttle valve 4 by the return spring 9 is brought into contact with the stopper 13. Thereby, the stopper 13 is connected to the throttle valve 4
Functions as a fully-closed stopper that regulates the rotation of the
The fully closed opening degree (gap between the throttle valve 4 and the core 5) of the throttle valve 4 is regulated to a predetermined amount. A lock nut 15 is screwed to the stopper 13.

[0005]

In the conventional throttle body described above, when the throttle valve 4 is rapidly closed, the contact piece 14 of the throttle lever 7 is moved to the stopper 13.
May give a large impact force. Therefore, for example, when a large impact force is applied to the stopper 13 at high temperature or high humidity, the stopper mounting boss 10 of the resin body 1 may be deformed. If the throttle valve 4 is excessively closed due to the deformation of the stopper mounting boss portion 10, an operation failure such as the throttle valve 4 sticking to the metal core 5 will be caused. Conventionally, in order to prevent deformation of the stopper mounting boss portion 10, a resin material having excellent strength at high temperature and high humidity (for example, glass fiber reinforced phenol resin, glass fiber Although reinforced polyphenylene sulfide resin (PPS) is used, such a resin material is expensive, and therefore, a solution is eagerly desired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to prevent deformation of a stopper mounting boss of a resin body body due to an impact applied to the stopper. It is to provide a throttle body that can be prevented.

[0007]

According to a first aspect of the present invention, there is provided a body for forming an intake passage, a throttle shaft rotatably provided on the body.
A throttle valve attached to the throttle shaft and capable of opening and closing the intake passage; the body is made of a resin obtained by insert molding a metal core forming an intake passage near the throttle valve; A throttle body in which a stopper mounting boss portion for mounting a stopper for regulating is provided on the body main body, and a core metal portion to which the stopper can be mounted is formed in the core. is there. According to the throttle body of the first aspect, the impact applied to the stopper is received by the metal core of the metal core, so that the deformation of the stopper mounting boss of the resin body can be prevented.

According to a second aspect of the present invention, there is provided a body main body forming an intake passage, a throttle shaft rotatably provided in the body main body, and a throttle valve attached to the throttle shaft and capable of opening and closing the intake passage. The body body is made of a resin obtained by insert molding a metal core forming an intake passage near a throttle valve, and a stopper mounting boss portion for mounting a stopper for restricting rotation of the throttle valve is provided on the body body. Wherein a cored bar having a tip protruding near the stopper mounting boss is formed in the core. According to the throttle body of the second aspect, the core mounting portion formed on the metal core reinforces the stopper mounting boss portion of the resin body main body.
The deformation of the stopper mounting boss of the resin body body due to the impact applied to the stopper can be prevented.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments 1 and 2 of the present invention will be described. In each embodiment, a part of the conventional example is modified, so the modified part will be described in detail, and the parts which are considered to be the same or substantially the same configuration as the conventional example will be denoted by the same reference numerals and will be repeated. Description is omitted. Embodiment 1 Embodiment 1 will be described with reference to FIGS. FIG. 1 is a partially cutaway side view of the throttle body, and FIG. 2 is a cutaway front view of the same part. In the present embodiment, the screw member 11 in the conventional example (see FIGS. 9 and 10) is eliminated, and the core 5 is formed with a metal core 17 projecting substantially in an L shape. A female screw 18 for attaching a stopper is formed at the tip of the cored bar 18. This core 5 is shown in plan view in FIG. 3 and in side view in FIG. As shown in FIGS. 1 and 2, the metal core 17 is inserted into the body 1 and the stopper mounting boss 10, so that its appearance is almost the same as that of the conventional example. The female screw 18 of the metal core 17 has
The stopper 13 is screwed similarly to the conventional example.

According to the throttle body of this embodiment, since the impact applied to the stopper 13 is received by the metal core 17 of the metal core 5, the deformation of the stopper mounting boss 10 of the resin body 1 can be prevented. . This allows
The malfunction of the throttle valve 4 due to the deformation of the conventional stopper mounting boss 10 can be avoided. Also,
Even if an expensive resin material having excellent high-temperature strength and high-humidity strength is not used for the resin material of the body body 1, inexpensive resin materials (for example, glass fiber reinforced polyamide resin (PA), glass fiber reinforced polybutylene terephthalate resin (PBT)) ))
Therefore, the cost of the resin material of the body 1 can be reduced. The present invention does not limit the resin material. This embodiment corresponds to the first aspect of the present invention.

Since the strength of the stopper mounting boss 10 of the body 1 can be ensured by the metal core 17 of the core 5, the shape of the stopper mounting boss 10 can be reduced in size. .

A metal core 5 for supporting a throttle shaft 3 to which a throttle valve 4 is attached has a female screw 1
Since the core metal part 17 having the core 8 is formed, even if the core 5 moves with respect to the body main body 1, the positional relationship between the core 13 and the stopper 13 screwed to the female screw 18 of the core metal part 17 is kept constant. By doing so, it is possible to prevent a malfunction in which the throttle valve 4 sticks to the core 5.

Embodiment 2 Embodiment 2 will be described with reference to FIGS. FIG. 5 is a partially cutaway side view of the throttle body, and FIG. 6 is a cutaway front view of the same part. In this embodiment, the screw member 11 in the conventional example (see FIGS. 9 and 10) is not removed and is used as it is.
0 is formed. As shown in FIG. 6, the distal end portion 20 a of the cored bar portion 20 protrudes near the screw member 11,
It is separated from the screw member 11 with a required gap. This core 5 is shown in plan view in FIG. 7 and in side view in FIG. As shown in FIGS. 5 and 6, since the core metal part 17 is inserted into the body main body 1 and the stopper mounting boss part 10, the appearance is almost the same as that of the conventional example.

According to the throttle body of the present embodiment, the metal core portion 20 formed on the metal core 5 reinforces the boss portion 10 for attaching the stopper of the resin body body 1, so that the resin member is formed by the impact applied to the stopper 13. The deformation of the stopper mounting boss portion 10 of the body 1 can be prevented. Therefore, the same operation and effect as those of the first embodiment can be obtained. This embodiment corresponds to the second aspect of the present invention.

According to the present embodiment, a standardized commercially available nut can be used for the screw member 11, and the cored bar portion 17 having the female screw 18 on the core 5 as in the first embodiment is formed. Since the shape of the core 5 is simpler than the case where the core 5 is manufactured, the manufacturing of the core 5 is easy, which is advantageous for cost reduction.

The present invention is not limited to the above embodiment, but can be modified without departing from the spirit of the present invention. For example, the present invention can be implemented in a throttle body provided with a full-open stopper that restricts rotation of the throttle lever 7 in the opening direction.

[0017]

According to the present invention, it is possible to prevent the stopper boss of the resin body from being deformed by the impact applied to the stopper.

[Brief description of the drawings]

FIG. 1 is a partially broken side view of a throttle body according to a first embodiment.

FIG. 2 is a partially cutaway front view of a throttle body.

FIG. 3 is a plan view of a core.

FIG. 4 is a side view of a core.

FIG. 5 is a partially broken side view of a throttle body according to a second embodiment.

FIG. 6 is a partially cutaway front view of the throttle body.

FIG. 7 is a plan view of a core.

FIG. 8 is a side view of the core.

FIG. 9 is a partially cutaway side view of a throttle body showing a conventional example.

FIG. 10 is a partially cutaway front view of the throttle body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body main body 2 Intake passage 3 Throttle shaft 4 Throttle valve 5 Core 10 Stopper mounting boss part 13 Stopper 17 Core part 20 Core part

Claims (2)

[Claims] A body that forms an intake passage; a throttle shaft rotatably provided in the body;
A throttle valve attached to the throttle shaft and capable of opening and closing the intake passage; the body is made of a resin obtained by insert molding a metal core forming an intake passage near the throttle valve; A throttle body in which a stopper mounting boss portion for mounting a stopper for regulating is provided on the body main body, wherein a core metal portion to which the stopper can be mounted is formed in the core. 2. A body main body forming an intake passage, a throttle shaft rotatably provided in the body main body,
A throttle valve attached to the throttle shaft and capable of opening and closing the intake passage; the body is made of a resin obtained by insert molding a metal core forming an intake passage near the throttle valve; A stopper mounting boss portion for mounting a stopper for regulating is a throttle body provided on the body main body, and a core metal portion having a tip protruding near the stopper mounting boss portion is formed on the core. Throttle body characterized by doing.