JPH064045Y2 - Engine intake control valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an intake control valve device installed in an intake passage for controlling an intake air amount of an engine.

(Prior Art) A throttle body of an intake system including a liquid fuel carburetor and a fuel injection device, a throttle valve provided in a gas fuel mixer to control an engine rotation speed, and an intake manifold provided with an engine combustion. The shut-off valve for improvement, operability, and output improvement is generally a butterfly valve, and a valve shaft with a valve plate that opens and closes the intake passage is placed across the intake passage and rotatably supported by the body. .

(Problem to be Solved by the Invention) The valve shaft of the throttle valve or the shutoff valve, that is, the intake control valve is inserted into the shaft mounting hole of the body and is rotatably supported by a slide bearing or a rolling bearing. The valve is designed so that it will not be disassembled and reassembled after manufacturing and assembling so that the idling position will not be disturbed and the operation of the engine will be hindered. That is, when the valve shaft is supported by a rolling bearing, the outer ring and the inner ring are pressed into the inner peripheral surface of the shaft mounting hole and the outer peripheral surface of the valve shaft, respectively, or the rolling bearing is set in a floating state to the outer side. The structure is such that it cannot be disassembled unless a retainer with packing is pressed in and removed. Therefore, even if foreign matter such as carbon contained in the air in the intake passage enters through the gap between the valve shaft and the shaft mounting hole on the intake passage and adheres to the inside of the rolling bearing as the engine runs, only the rolling bearing is removed to clean it. However, if foreign matter accumulates, it will hinder the normal rotation of the valve shaft. In such a case, the throttle body of the flanger intake system of the carburetor supporting the throttle valve and its valve shaft must be replaced, which imposes a heavy economic burden on the user.

In view of these circumstances, the present invention was devised for the purpose of providing an intake control valve device capable of easily removing a rolling bearing from a shaft mounting hole.

(Means for Solving the Problems) The present invention relates to an intake control valve device for an engine in which a valve shaft is rotatably supported by a body across an intake passage and a valve plate for opening and closing the intake passage is attached to the valve shaft. As means for solving the above-mentioned problems, there are rolling bearings in a floating state with respect to the inner peripheral surface of the shaft mounting hole formed in the body and the outer peripheral surface of the valve shaft, and the outer peripheral surface of the valve shaft. A retainer having a packing in contact with a surface and floating with respect to an inner peripheral surface of the shaft mounting hole, and a retaining member are disposed in the shaft mounting hole so as to surround the valve shaft, and the retaining member. Has a notched annular shape and is removably fitted into an annular groove provided in the shaft mounting hole to hold the rolling bearing and the retainer.

In addition to the above, an elastic washer is arranged between the rolling bearing and the retainer.

(Operation) The rolling bearing rotatably supports the valve shaft on the body, and the retainer packing blocks the atmosphere and the intake passage. When the retaining member is contracted and removed from the annular groove and pulled out from the shaft mounting hole, the retainer and rolling bearing in the floating state are taken out from the shaft mounting hole.

(Example) The Example of this invention is described based on drawing.

FIG. 1 shows an example in which the present invention is applied to a throttle body of an intake system, in which a valve shaft 3 is provided on both sides of a shaft mounting hole across the center of an intake passage 2 formed in a body 1 composed of a throttle body. 4, the disc-shaped valve plate 5 is fixed to the valve shaft 3 to open and close the intake passage 2.

A rolling bearing 6, an elastic washer 7, a retainer 8, and a retaining member 9 are sequentially arranged in the shaft mounting hole 4 so as to surround the valve shaft 3 from the inner side, that is, the intake passage 2 side toward the outer side, that is, the atmosphere side.

Referring to FIG. 1 and FIG. 2 in which a part thereof is enlarged, the rolling bearing 6 has its outer ring 6a and inner ring 6b press-fitted into the inner peripheral surface of the shaft mounting hole 4 and the outer peripheral surface of the valve shaft 3. It surrounds the valve shaft 3 in a floating state without moving. Retainer 8 is a ring
A structure in which a packing 11 composed of an O-ring, a felt ring, etc. is mounted and held on the inner peripheral surface of 10 and the packing 11 is in contact with the outer peripheral surface of the valve shaft 3 and the ring body 10 is the inner peripheral surface of the shaft mounting hole 4. The valve shaft 3 is surrounded in a floating state without being pressed into. The retaining member 9 has a notched annular shape, and an annular groove 12 formed in the shaft mounting hole 4 is fitted therein, and an inner peripheral edge portion thereof projects into the shaft mounting hole 4. The elastic washer 7 is formed by a conical or other dish-shaped washer, and is installed between the rolling bearing 6 and the retainer 8 so that the rolling bearing 6 is pressed against the step portion 4a of the shaft mounting hole 4 by its elastic force. Are pressed against the retaining member 9 to prevent their movement in the thrust direction.

Since the retaining member 9 contracts when it is sandwiched at both ends and comes out of the annular groove 12, the retaining member 9 is extracted from the shaft mounting hole 4 and then the relay 8, elastic washer 7, and rolling bearing 6 are sequentially removed from the shaft mounting hole 4. In this case, if the retaining member 9 of one shaft mounting hole 4 is removed and the valve shaft end is directed downward, the retainer 8, the elastic washer 7, and the rolling bearing 6 are dropped as they are and taken out from the shaft mounting hole 4. The valve shaft 3 can be cleaned or replaced and reassembled without removing it.

(Effect of the Invention) As described above, according to the present invention, a roller bearing that rotatably supports the valve shaft and a retainer having a packing that isolates the intake air 6 from the atmosphere are provided in both the shaft mounting hole and the valve shaft. Since it is placed in a floating state without being press-fitted and is held in the shaft mounting hole by a notch-shaped retaining member, it can be used as a retainer bearing with a very simple operation of contracting and removing the retaining member. Can be removed, cleaning can be done without inconvenience that the valve shaft is removed and the idling position is disturbed, and parts can be easily inspected and replaced, reducing the economic burden on users.

Further, when the elastic washer is arranged between the rolling bearing and the retainer, there is an advantage that the movement of these in the thrust direction is eliminated and the valve shaft can be stably supported.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG.
It is an expanded partial view of a figure. 1 ... Body, 2 ... Intake passage, 3 ... Valve shaft, 4 ... Shaft mounting hole, 5 ... Valve plate, 6 ... Rolling bearing, 7 ... Elastic washer, 8 ... Retainer, 9 ... Retaining member, 11 …… packing, 12 …… annular groove,

Claims (2)

[Scope of utility model registration request] 1. An intake control valve device for an engine, wherein a valve shaft is rotatably supported by a fuselage across an intake passage, and a valve plate for opening and closing the intake passage is attached to the valve shaft. A rolling bearing (6) which is in a floating state with respect to the inner peripheral surface of the shaft mounting hole (4) and the outer peripheral surface of the valve shaft (3), and the valve shaft.
A retainer (8) having a packing (11) in contact with the outer peripheral surface of (3) and floating relative to the inner peripheral surface of the shaft mounting hole (4);
The retaining member (9) surrounds the valve shaft (3) and the shaft mounting hole
(4), the retaining member (9) has a notched annular shape, and is removably fitted into an annular groove (12) provided in the shaft mounting hole (4) so that the rolling bearing ( 6) and retainers (8)
Intake control valve device holding. 2. The intake control valve device for an engine according to claim 1, wherein an elastic washer (7) is arranged between the rolling bearing (6) and the retainer (8).