JP2020076354A - Throttle device - Google Patents

Abstract

To provide a throttle body which is reduced in size.SOLUTION: A throttle device (10) has a throttle body (30) having a boss (32) for supporting a shaft (12) of a throttle valve (11), and an insulator (20) having a fitting part (21) fit into an external peripheral face (35) of an opening end (34) of the throttle body (30). The boss (32) is protruded to the outside of the throttle body (30) in a radial direction, and a region including an end part (37) of the boss (32) at the opening end (34) side is underfilled. A tip face (21a) of the fitting part (21) is located in the underfilled region (V).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a throttle device connected to an insulator.

  The engine is provided with a throttle device for controlling the intake air amount. As a conventional technique related to such a throttle device, there is a technique disclosed in Patent Document 1.

  The throttle device disclosed in Patent Document 1 is provided in an engine of a motorcycle, and includes a throttle body having an intake passage, a throttle valve rotatably supported by the throttle body to open and close the intake passage, and a throttle valve. Also has a fuel injection device provided in the throttle body downstream. The throttle body is connected to the intake port of the engine via an insulator.

JP, 2014-145349, A

  When reducing the size of the throttle device disclosed in Patent Document 1, it is conceivable to set the intake passage short. The boss that supports the shaft of the throttle valve projects radially outward of the outer peripheral surface of the throttle body. Further, the end portion (fitting portion) of the insulator is fitted to the outer peripheral surface of the throttle body.

  Therefore, if the dimension from the boss to the opening end of the throttle body is set to be short, when the insulator is inserted into the throttle body, the tip of the insulator and the boss may interfere with each other, and the predetermined insertion dimension may not be secured.

  An object of the present invention is to provide a miniaturized throttle body.

According to the invention according to claim 1, a throttle body having a boss that supports the shaft of the throttle valve,
A throttle device having an insulator having a fitting portion fitted to the outer peripheral surface of the opening end of the throttle body,
The boss projects outward from the diameter of the throttle body,
A portion of the boss including an end portion on the opening end side is lacking in thickness, and a tip of the fitting portion is located in the lacking area. A device is provided.

    In the first aspect, the throttle body includes the boss that supports the shaft of the throttle valve. A portion of the boss including the end portion on the opening end side of the throttle body is lacking. The tip of the fitting portion of the insulator is located in the region of the throttle body where the wall thickness is reduced.

  Compared with the case where the boss is not thinned, the insertion dimension of the fitting portion of the insulator can be secured. Therefore, the dimension from the boss of the throttle body to the opening end can be set short. The throttle body can be downsized.

FIG. 1A is a cross-sectional view of a throttle device connected to an insulator. FIG. 1B is an enlarged view of a main part of FIG. FIG. 2A is an operation diagram of the embodiment. FIG. 2B is a diagram illustrating a comparative example.

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the description, Us indicates the upstream side and Ds indicates the downstream side.
<Example>

  FIG. 1A shows a throttle device 10 provided on a two-wheeled vehicle. The throttle device 10 is connected to the intake port of the cylinder head of the engine EN via the insulator 20.

  The throttle device 10 includes a throttle body 30 having an intake passage 31, a throttle valve 11 provided in the throttle body 30 for opening and closing the intake passage 31, and a shaft 12 of the throttle valve 11 protruding outwardly of the throttle body 30. A first boss 32 that supports one end 12a, a first bearing 13 provided on the first boss 32, and a first boss 32 that projects radially outward of the throttle body 30 and supports the other end 12b of the shaft 12. The second boss 33, the second bearing 14 provided on the second boss 33, the lever 15 that is fixed to the one end 12 a of the shaft 12 and rotates the shaft 12, and the first boss 32 and the lever 15. It has a case 16 surrounding the periphery, and a control device 17 provided on the throttle body 30 to press the lever 15 to control the idle opening of the throttle valve 11.

  On the downstream side of the intake passage 31, the outer peripheral surface 35 of the opening end 34 of the throttle body 30 is fitted into the inner peripheral surface 22 of the fitting portion 21 of the insulator 20.

  Please refer to FIG. 1B and FIG. The first boss 32 has a cylindrical shape. The lower portion 36 of the first boss 32 is lacking in a side surface 38 including an end portion 37 on the opening end 34 side and an inside 39 thereof. A surface 32a of the first boss 32, which is lacking in thickness and faces the opening end 34 side, and the distal end surface 21a of the fitting portion 21 are in contact with each other. The dimension in which the throttle body 30 is inserted into the fitting portion 21 of the insulator 20 is D. The dimension from the center C of the first boss 32 to the open end 34 is L1.

  The second boss 33 (see FIG. 1A) also has the same shape as the first boss 32. The description of the second boss 33 will be omitted.

  Next, the effect of the embodiment will be described.

  Reference is made to FIG. In the throttle device 100 of the comparative example, the downstream end 104 of the boss 102 is not thinned. The end 104 of the boss 102 and the tip 107 of the fitting portion 106 of the insulator 105 are in contact with each other. Therefore, if the dimension L2 from the center C of the boss 102 of the throttle body 101 to the opening end 103 is shortened, the dimension inserted into the fitting portion 106 of the insulator 105 becomes shorter than the predetermined dimension D.

  Please refer to FIG. 1B and FIG. In the throttle device 10 of the embodiment, the lower portion 36 of the first boss 32 is lacking in the side surface 38 including the end portion 37 on the open end 34 side and the inside 39 thereof. The surface 32a facing the opening end 34 side due to lack of thickness and the tip end surface 21a of the fitting portion 21 are in contact with each other. Therefore, even if the dimension from the center C to the opening end 34 is set as short as L1, the predetermined insertion dimension D can be obtained. Therefore, the throttle body 30 can be downsized.

  The present invention is not limited to the examples as long as the effects and advantages of the present invention are exhibited. For example, the surface 32a of the first boss 32 and the tip surface 21a of the insulator 20 do not have to be in contact with each other. It suffices if the tip end surface 21a of the insulator 20 is located within the region V (FIG. 1B) where the wall thickness is lacking.

  The throttle device of the present invention is suitable for a two-wheeled vehicle.

10 ... Throttle device 11 ... Throttle valve 12 ... Shaft 20 ... Insulator 21 ... Fitting part 21a ... Tip surface 22 ... Inner peripheral surface 30 ... Throttle body 31 ... Intake passage 32 ... First boss 32 ... Surface 33 facing the insulator ... Second boss 34 ... Opening end 35 ... Outer peripheral surface 36 ... Lower part 37 ... End 38 ... Side 39 ... Inside D ... Insertion dimension L1 ... Dimension from center of boss to opening end

Claims (1)

A throttle body with a boss that supports the axis of the throttle valve;
A throttle device having an insulator having a fitting portion fitted to the outer peripheral surface of the opening end of the throttle body,
The boss projects outward from the diameter of the throttle body,
A portion of the boss including the end portion on the opening end side is lacking in thickness,
The throttle device, wherein the tip of the fitting portion is located in the region where the wall thickness is reduced.

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