JPH0540285Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a throttle body for an internal combustion engine.
In particular, the present invention relates to a multiple throttle body having a plurality of intake valves and a common valve shaft that pivotally supports the throttle valves of each intake barrel.

<Prior Art> Conventionally, high-output, large-displacement engines have used multiple throttle bodies in which a plurality of intake barrels are arranged in parallel in order to suck in a large amount of air. In a multiple throttle body, when the throttle valves of each intake barrel are supported by one common valve shaft so as to be interlocked, the valve shaft is supported at both ends of the valve shaft and at a partition wall between the intake barrels. It is preferable to support the valve shaft of the throttle valve with a ball bearing as disclosed in Japanese Utility Model Application No. 60-175879, since this reduces the frictional force between it and the throttle body body due to suction negative pressure and allows for smooth rotation. .

Ball bearings are normally attached to the throttle body from the outside along the axial direction of the valve stem for structural reasons such as airtightness.
The valve shaft has a structure in which both ends are supported by ball bearings, and the center part is directly supported by a bearing hole provided in the partition between the intake barrels. However, because the load in the radial direction is concentrated on this partition wall due to negative suction pressure than on both ends, the frictional force generated between the valve shaft and the bearing hole prevents the smooth operation of the throttle valve. There was a problem.

<Problems to be solved by the invention> Therefore, the purpose of the invention is to attach a ball bearing that receives a load in the radial direction to the partition wall between the intake barrels to support the valve shaft, so that the throttle body can be moved by the suction negative pressure. It is an object of the present invention to provide a multiple throttle body that can reduce the frictional force generated between the throttle body and the main body, thereby making the operation of the throttle valve smoother.

<Means for solving the problem> According to the present invention, the above purpose is achieved by
A multiple throttle body comprising: a plurality of intake barrels, and a common valve shaft rotatably supported by a throttle body main body to pivotally support the throttle valves of both intake barrels, the throttle body having a common valve shaft rotatably supported by the throttle body main body, A bearing hole that airtightly penetrates the valve shaft and a groove opened in a direction transverse to the bearing hole are provided in a partition wall between the valve shafts, and a spacer member that holds a ball bearing that supports the valve shaft is located in the groove. This is achieved by providing a multiple throttle body that is press-fitted into the throttle body.

<Function> In this way, by press-fitting the spacer member that holds the ball bearing into the groove provided in the partition wall of the throttle body main body, the valve shaft can be secured while ensuring airtightness in the partition wall. can be supported by ball bearings.

<Embodiments> The present invention will now be described in detail with reference to specific embodiments with reference to the accompanying drawings.

FIG. 1 shows a multiple throttle body to which the present invention is applied. This multiple throttle body is a two-unit type in which two intake barrels 2 and 3 of the same shape are arranged side by side in a throttle body main body 1, and intake passages 4 and 5 are provided inside in the vertical direction as shown in the figure. There is. In the throttle body body 1,
Butterfly-type throttle valves 6 and 7 are rotatably supported on a common valve shaft 8 to open and close each intake passage 4 and 5. The valve shaft 8 passes through the throttle body main body 1 in a direction orthogonal to the intake passages 4 and 5, and is rotatably supported at both ends 9 and 10 and at a central portion 11 thereof.

One end 9 of the valve shaft 8 substantially airtightly passes through a bearing hole 13 of a boss portion 12 protruding from one side of the throttle body main body 1 and is supported by a bearing 14 . In this embodiment, the bearing 14 is a sealed deep groove ball bearing that receives a load in the radial direction. A sealing material 15 and a sleeve 16 are attached to the outside of the bearing 14, and a throttle lever 17 is fixed to the outer end of the end portion 9 with a nut 18 to prevent it from coming off. The throttle lever 17 is always urged by a return spring 19 in the direction in which the throttle valves 6 and 7 are closed.

The other end 10 of the valve shaft 8 is substantially airtightly fitted into a bearing hole 21 of another boss portion 20 protruding from the side opposite to the boss portion 12 of the throttle body main body 1.
It is directly supported by the throttle body main body 1. A connecting lever 22 is secured to the tip of the end portion 10 with a nut 23 so as to be able to rotate integrally with the valve shaft 8 . A throttle opening sensor 24 is fixed to the outer end of the boss portion 20, and the arm 2
5 is engaged with the connecting lever 22. Like the throttle lever 17, the connecting lever 22, together with the arm 25, is always urged in the closing direction of the throttle valves 6 and 7 by a return spring 26.

The center portion 11 of the valve shaft 8 passes through bearing holes 28 and 29 of the center partition wall portion 27 of the throttle body main body 1 in a substantially airtight manner and is supported by a bearing 30. As shown in FIG. 3, the bearing 30 has an outer ring 30a inserted into a circular hole 3 in a rectangular spacer member 31 having approximately the same width.
2 and are integrally fixed. On the other hand,
In the center partition wall 27 of the throttle body main body 1,
As shown in FIG. 2, a deep groove 33 having approximately the same width as the spacer member 31 is formed from the lower end surface 1a. The bearing 30 is press-fitted into the deep groove 33 and integrally with the spacer member 31 . As described above, since the throttle body main body 1 leaves partition wall portions of a certain thickness on both sides of the bearing 30, airtightness in the central portion 11 is ensured and intake air leakage is prevented. In this embodiment, similarly to the bearing 14 of the end portion 9, a sealed deep groove ball bearing that receives a load in the radial direction is used as the bearing 30.

The valve stem 8 is attached to the throttle body body 1 in the following manner.
Attach to. First, the spacer member 31 that integrally holds the bearing 30 is inserted into the groove 33 into the opening 3 of the end surface 1a.
Press fit from 0a, align the inner ring 27b with the bearing hole 28, and fix it. Next, the valve stem 8 is inserted through the bearing hole 13 of the boss portion 12 with the end portion 10 first. The end portion 10 is fitted into the bearing hole 21, and the central portion 11 is fitted into the inner ring 30b of the bearing 30. The valve shaft 8 has stepped portions 34 and 35 whose diameter is enlarged at the portion passing through the intake barrel 3, and the stepped portions 34 are brought into contact with the end surface of the inner ring 30b. A bearing 1 is attached to the end 9 of the valve shaft 8.
4 is fitted with its inner ring 14a in contact with the stepped portion 35, and is press-fitted into the boss portion 12 and fixed at the same time as the valve shaft 8 is inserted.

A sleeve 16 and a sealing material 1 are placed on the outside of the bearing 14.
5. Attach the return spring 19, throttle lever 17, etc., and screw the nut 18 onto the outer end of the valve shaft 8. Similarly, the opposite end 10 has a boss portion 2.
Connecting lever 22 and return spring 26 inside
etc., and screw together the nut 23. both nuts 1
By tightening 8 and 23, the inner ring 14a of the bearing 14 is pressed against the stepped portion 35 via the sleeve 16, and the inner ring 30b of the bearing 30 is pressed against the stepped portion 34. By mounting the valve stem 8 in this manner, airtightness in the central partition wall portion 27 and the boss portion 12 is ensured.

In the above-described embodiment, the groove of the central partition into which the bearing is press-fitted was formed on the lower surface of the throttle body, but it may also be formed on the side of the throttle body. Furthermore, both intake barrels are not limited to having the same shape, but may have different diameters. Furthermore, the present invention can be applied to a one-bore throttle body and carburetor. In addition, various modifications and changes may be made to the above embodiments within the technical scope of the present invention.
It can be implemented with modifications.

<Effects of the invention> As described above, according to the invention, a groove is formed in the center partition of the throttle body main body, and a spacer member that holds the bearing is press-fitted into this groove, so that the valve shaft can be attached to the center partition. Since the valve can be supported by a bearing while ensuring airtightness at the part, the frictional force generated between the throttle body and the main body due to suction negative pressure can be reduced, allowing the throttle valve to operate more smoothly. , its operability and reliability are improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the throttle body. FIG. 2 is a bottom view of the throttle body shown in FIG. FIG. 3 is a front view showing the bearing mounted on the spacer member. 1... Throttle body body, 2, 3... Intake barrel, 6, 7... Throttle valve, 8... Valve shaft,
27...Central partition part, 28, 29...Bearing hole, 3
0... Bearing, 31... Spacer member, 33...
groove.

Claims (1)

[Claims for Utility Model Registration] A multiple valve system comprising two intake barrels arranged in parallel and a common valve shaft rotatably supported by a throttle body body to pivotally support the throttle valves of both intake barrels. The throttle body is provided with a bearing hole that airtightly penetrates the valve shaft and a groove opened in a direction transverse to the bearing hole in a partition wall between the two intake barrels of the throttle body main body, A multiple throttle body characterized in that a spacer member that holds a ball bearing that supports the is press-fitted into the groove.