JP3966660B2 - Intake air amount control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
According to the present invention, at least one end of a valve shaft to which a throttle valve is fixed protrudes from an intake passage body, and an inner ring provided in a ball bearing between the intake passage body and the valve shaft and a throttle lever fixed to the one end of the valve shaft. A distance collar is sandwiched between them, and the operating force from the input lever fixed to the cylindrical lever collar surrounding the distance collar is transmitted to the throttle lever via the operating force transmission spring, and the throttle valve is closed. Synthetic resin for ensuring the relative sliding of the throttle lever and lever collar by surrounding the distance collar with a coiled return spring that exerts a spring force to urge the throttle lever and a spring force to bring the lever collar close to the throttle lever One washer made of throttle lever and distance collar It relates intake air amount control device sandwiched between the bar color.
[0002]
[Prior art]
Conventionally, such an intake air amount control device is configured as shown in FIG. 5. A throttle lever 19 is fixed to one end of a valve shaft to which the throttle valve 14 is fixed, and an inner ring 28 a of the ball bearing 28, the throttle lever 19, A distance collar 30 is sandwiched between the ring collars, and a ring-shaped washer 37 is sandwiched between the outer end of the lever collar 32 surrounding the distance collar 30 and the throttle lever 19 as shown by a chain line. .
[0003]
[Problems to be solved by the invention]
However, in the above conventional apparatus, when the distance collar 30, the throttle lever 19, the lever collar 32 including the input lever 20, the washer 37, and the return spring 36 are assembled, as shown by the solid line in FIG. It tends to come off from the outer periphery of 30. This is because when the assembly is performed while pressing the throttle lever 19 against the intake passage body 13 side against the spring force of the return spring 36, the ring-shaped washer 37 is throttled by the lever collar 32 by the spring force of the return spring 36. This is because the lever 19 is pushed, and it is difficult to assemble the distance collar 30, the throttle lever 19, the lever collar 32, the washer 37, and the return spring 36 while preventing the washer 37 from being displaced. .
[0004]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide an intake air amount control device that facilitates assembly work by preventing the washer from being displaced.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, an intake passage body that forms an intake passage, an annular step portion that faces outward, and a screw shaft portion that protrudes from the center portion of the step portion are provided on one end side. And at least one end projecting from the intake passage body so as to be rotatably supported by the intake passage body, and a butterfly shape fixed to the valve shaft so that the opening degree of the intake passage can be controlled A throttle valve, a ball bearing provided between the intake passage body and the valve shaft, a cylindrical distance collar that surrounds the valve shaft by bringing an inner end into contact with an outer surface of an inner ring provided in the ball bearing, A throttle lever that is fastened to the screw shaft portion of the valve shaft and abuts against the outer end of the distance collar, and enables relative rotation within a limited range of the throttle lever. A cylindrical lever collar surrounding the distance collar, an input lever fixed to the lever collar so as to be able to input an operating force and disposed on the inner side of the throttle lever, and an operating force from the input lever Operating force transmitting spring for transmitting the pressure to the throttle lever, spring force for biasing the throttle lever toward the closing side of the throttle valve, and biasing the lever collar in a direction to bring the lever collar closer to the throttle lever A coiled return spring that exerts a spring force to surround the lever collar, and is sandwiched between one of the throttle lever and the distance collar and the lever collar to ensure relative sliding of the throttle lever and the distance collar. A synthetic resin washer disposed substantially coaxially with the valve stem In the intake air quantity control apparatus comprising, characterized in that to hold the inner circumference of the washer to the outer periphery of the distance collar including a washer holding means for placing said washer substantially coaxial with the valve axis.
[0006]
According to such a configuration, when the distance collar, the throttle lever, the lever collar including the input lever, the washer, and the return spring are assembled, it is possible to prevent the washer from being displaced. Assembling work can be facilitated by preventing the deviation.
[0007]
According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, the washer holding means projects radially outward from the outer end of the distance collar and contacts the inner surface of the throttle lever. The washer formed in a ring shape surrounding the outer periphery of the distance collar is sandwiched between the inner surface of the collar and the outer end surface of the lever collar, and according to such a configuration, the distance In the state where the washer is mounted on the outer periphery of the collar, even if the washer is pushed by the lever collar on which the spring force of the return spring acts, the washer does not come off the outer periphery of the distance collar only by contacting the collar. Assembling work can be facilitated by preventing the washer from being displaced.
[0008]
According to a third aspect of the invention, in addition to the configuration of the first aspect of the invention, the washer holding means is formed in a ring shape surrounding the outer periphery of the distance collar, and the outer end surface of the lever collar and the throttle A cylindrical portion that is integrally connected to the inner periphery of the washer sandwiched between the inner surfaces of the lever and extends to the opposite side of the throttle lever, and is provided on the inner periphery of the outer end portion of the lever collar so that the cylindrical portion can be inserted. According to such a configuration, the cylindrical body is inserted into the recess at the inner periphery of the outer end of the lever collar, and the distance collar is inserted into the lever collar to perform the assembly. Even if the washer is pushed by the lever collar on which the spring force of the spring acts, the cylindrical part integrated with the washer is held on the outer periphery of the distance collar, so the washer is Without deviating from the outer periphery of the stance color, the assembling work can be facilitated to prevent the axial misalignment of the washer may occur.
[0009]
Further, the invention according to claim 4 is characterized in that, in addition to the configuration of the invention according to claim 3, the cylindrical portion is lightly press-fitted into the recess, and according to this configuration, the washer is temporarily attached to the lever collar. Since the assembly can be performed in a fixed state, the assembly operation is further simplified.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.
[0011]
1 to 3 show a first embodiment of the present invention. FIG. 1 is an overall plan view of an intake air amount control device, FIG. 2 is a side view taken along the arrow 2 in FIG. 1, and FIG. FIG.
[0012]
1 and 2, the intake air amount control device is for a V-type two-cylinder engine mounted on a motorcycle, for example, and first and second throttle bodies individually corresponding to each cylinder of the engine. 11A and 11B.
[0013]
The first and second throttle bodies 11A and 11B can control the opening degree of the intake passages 12 in the intake passage bodies 13 forming the intake passages 12 connected to the intake ports of the cylinders in the engine. A butterfly throttle valve 14 is rotatably supported, and is arranged so as to be paired with each other at two positions spaced in a direction perpendicular to the rotation axis of each throttle valve 14. Is done.
[0014]
The intake passage bodies 13 of the throttle bodies 11A, 11B have the same shape, and both intake passages 12 are set on a straight line L passing through the axes of the intake passages 12 of the intake passage bodies 13 respectively. Are arranged symmetrically with respect to the center C therebetween. The intake passage bodies 13 are arranged at intervals in a direction parallel to the rotation axis of the throttle valves 14 and the intake passage bodies 13 are paired with a pair of connecting members 15 forming a substantially right-angled quadrilateral. , 16, and the connecting members 15, 16 are formed in a flat plate shape parallel to the straight line L.
[0015]
Each throttle valve 14 is fixed to a valve shaft 17 that is rotatably supported by the intake passage body 13 and is attached to one end of the valve shaft 17 protruding from the intake passage body 13 of the first throttle body 11A. The throttle lever 19 is fixed, and the throttle drum 18 is fixed to one end of the valve shaft 17 protruding from the intake passage body 13 of the second throttle body 11B. Moreover, the valve shaft 17 on the first throttle body 11A side is provided with an input lever 20 that can be rotated relative to the throttle lever 19 within a limited range, and the input lever 20 and the throttle drum 18 are interlocked. It is connected via a member 21. Thus, by rotating the throttle drum 18 with a throttle wire (not shown), the valve shafts 17 are rotated in conjunction with each other, and the opening degree of each throttle valve 14 is controlled in conjunction. An opening degree sensor S for detecting the opening degree of the throttle valve 14 is attached to the intake passage body 13 of the second throttle body 11B, and is opened to the other end of the valve shaft 17 on the side opposite to the throttle drum 18. The degree sensor S is connected.
[0016]
On each side of the intake passage bodies 13 in each of the throttle bodies 11A and 11B, a pair for injecting fuel into the intake passages 12 on the downstream side of the throttle valves 14 provided in the throttle bodies 11A and 11B. The fuel injection valves V and V are respectively attached so that the axes are arranged in a plane perpendicular to the axis of the valve shaft 17.
[0017]
The fuel injection valves V, V... Are respectively sandwiched between the intake passage bodies 13 and valve support members 23 attached to the intake passage bodies 13. The valve support member 23 has a fuel passage leading to the rear ends of the fuel injection valves V, V and is fastened to the intake passage body 13. The valve support member 23 is connected to the pair of valve support members 23, 23 for each throttle body 11 A, 11 B. Are connected to both ends of substantially U-shaped pipes 24, 24 communicating with the fuel passage, and to valve support members 23, 23 for attaching the fuel injection valves V, V to the first and second throttle bodies 11A, 11B. Are connected to both ends of a substantially U-shaped pipe 25 communicating with the fuel passage. A fuel inflow joint 26 for connection to a fuel supply pump (not shown) is attached to the valve support member 23 for attaching the fuel injection valve V to the second throttle body 11B, and the fuel injection valve V to the first throttle body 11A. A regulator 27 for returning excess fuel to a fuel tank (not shown) is connected to the valve support member 23 for attaching the fuel.
[0018]
In FIG. 3, one end side of the valve shaft 17 on the first throttle body 11A side protrudes outward from the intake passage body 13 with a ball bearing 28 interposed between the intake passage body 13 and the first throttle body 11A. A ball bearing 29 is interposed between the other end of the valve shaft 17 and the intake passage body 13. Moreover, a stepped portion 17a facing outward is formed on one end side of the valve shaft 17, and a screw shaft portion 17b protruding outward from the central portion of the stepped portion 17a is integrally projected.
[0019]
The protruding portion from the intake passage body 13 on one end side of the valve shaft 17 is surrounded by a cylindrical distance collar 30A in which the inner end abuts against the outer surface of the inner ring 28a of the ball bearing 28, and the distance collar 30A. The throttle lever 19 is brought into contact with the outer end of the motor. Thus, the screw shaft portion 17b of the valve shaft 17 is inserted through the central portion of the throttle lever 19, and the throttle lever 19 is moved by tightening the nut 31 screwed into the screw shaft portion 17b. The distance collar 30A is clamped between the inner ring 28a of the ball bearing 28 and the throttle lever 19 and is rotated together with the throttle lever 19 so as to be clamped between the outer end of the collar 30A and the nut 31. To do.
[0020]
The distance collar 30A is surrounded by a cylindrical lever collar 32A, and the input lever 20 is fixed to the outer periphery of the lever collar 32A so as to be positioned on the inner side of the throttle lever 19. The input lever 20 is provided with a connecting pin 33 having an axis parallel to the valve shaft 17, and the interlocking member 21 is connected to the connecting pin 33. In other words, the operating force input to the throttle drum 18 of the second throttle body 11B is input to the input lever 20 via the interlocking member 21.
[0021]
The input lever 20 and the throttle lever 19 are provided with opposing plate portions 20a and 19a facing each other in the circumferential direction of the valve shaft 17, and a shaft 34 having one end fixed to the input plate portion 19a is provided with the opposing plate portion 20a. The other end of the shaft 34 can be engaged with the outer surface side of the opposing plate portion 20a. In addition, a coil-shaped operating force transmission spring 35 surrounding the shaft 33 is provided between the opposing plate portions 19a and 20a so that the input lever 20, that is, the lever collar 32A is located with respect to the throttle lever 19 and the distance collar 30A. The operating force transmission spring 35 transmits the operating force from the input lever 20 to the throttle lever 19.
[0022]
The distance collar 32A is surrounded by a coiled return spring 36. One end of the return spring 36 is brought into contact with the input lever 20 and engaged with the throttle lever 19, and the other end of the return spring 36 is connected to the intake passage. It is brought into contact with the body 13 and engaged with the intake passage body 13. The return spring 36 exerts a spring force for urging the throttle lever 19 toward the closing side of the throttle valve 14 and a spring force for urging the lever collar 32A in a direction in which the lever collar 32A is brought closer to the throttle lever 19.
[0023]
Relative sliding of the throttle lever 19 and the lever collar 32A is ensured by a synthetic resin washer 37. The washer 37 is formed in a ring shape by synthetic resin and is arranged substantially coaxially with the valve shaft 17. The
[0024]
Thus, a collar portion 38 as a washer holding means for holding the inner periphery of the washer 37 on the outer periphery of the distance collar 30A and arranging the washer 37 substantially coaxially with the valve shaft 17 is provided outside the distance collar 30A. The flange 38 is integrally provided at the end so as to project radially outward from the outer end, the flange 38 abuts against the inner surface of the throttle lever 19, and the washer 37 is connected to the inner surface of the flange 38 and the inner surface of the flange 38. It is sandwiched between the outer end surfaces of the lever collar 32A.
[0025]
Next, the operation of the first embodiment will be described. The inner surface of the flange portion 38 that protrudes radially outward from the outer end of the distance collar 30A and contacts the inner surface of the throttle lever 19 and the outer end of the lever collar 32A. A ring-shaped washer 37 is sandwiched therebetween. Therefore, in the state where the washer 37 is mounted on the outer periphery of the distance collar 30A, even if the washer 37 is pushed by the lever collar 32A on which the spring force of the return spring 36 acts, the washer 37 only comes into contact with the flange portion 38. The distance collar 30A does not come off from the outer periphery.
[0026]
Accordingly, when the distance collar 30A, the lever collar 32A including the input lever 20, the washer 37 and the return spring 36 are assembled to the intake passage body 13, it is possible to prevent the washer 37 from being displaced. In addition, it is possible to prevent the shaft of the washer 37 from being displaced and facilitate the assembly work.
[0027]
FIG. 4 shows a second embodiment of the present invention, and parts corresponding to the first embodiment are given the same reference numerals.
[0028]
The protruding portion from the intake passage body 13 on one end side of the valve shaft 17 is surrounded by a cylindrical distance collar 30B that abuts the inner end on the outer surface of the inner ring 28a of the ball bearing 28. The distance collar 30A is surrounded by a cylindrical lever collar 32B capable of relative rotation within a limited range.
[0029]
Relative sliding of the throttle lever 19 and the lever collar 32B is performed by a synthetic resin washer 37 formed in a ring shape surrounding the outer periphery of the distance collar 30B and sandwiched between the outer end surface of the lever collar 32B and the inner surface of the throttle lever 19. A washer holding means 39 for holding the inner periphery of the washer 37 on the outer periphery of the distance collar 30B and arranging the washer 37 substantially coaxially with the valve shaft 17 is provided inside the washer 37. The cylindrical portion 40 is provided integrally with the circumference and extends on the opposite side of the throttle lever 19, and a concave portion 41 provided on the inner periphery of the outer end of the lever collar 32B so that the cylindrical portion 40 can be inserted. Is lightly press-fitted into the recess 41.
[0030]
According to the second embodiment, the return spring is obtained by inserting the distance collar 30B into the lever collar 32B and assembling it with the cylindrical portion 40 inserted into the recess 41 on the inner periphery of the lever collar 32B. Even if the washer 37 is pushed by the lever collar 32B on which the spring force of 36 acts, the cylindrical portion 40 integrated with the washer 37 is held on the outer periphery of the distance collar 30B, so that the washer 37 is detached from the outer periphery of the distance collar 30B. Therefore, it is possible to prevent the shaft of the washer 37 from being displaced and facilitate the assembly work.
[0031]
In addition, since the cylindrical portion 40 is lightly press-fitted into the concave portion 41, the assembling work can be further facilitated, and the assembling work can be performed with the washer 37 temporarily fixed to the lever collar 32B.
[0032]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.
[0033]
【The invention's effect】
As described above, according to the invention described in any one of claims 1 to 3, when the distance collar, the throttle lever, the lever collar including the input lever, the washer, and the return spring are assembled, the washer is misaligned. Therefore, it is possible to prevent the washer from being displaced and to facilitate the assembling work.
[0034]
Moreover, according to the invention of Claim 4, an assembly | attachment operation | work can be made still easier.
[Brief description of the drawings]
FIG. 1 is an overall plan view of an intake air amount control device.
FIG. 2 is a side view taken along arrow 2 in FIG.
3 is a cross-sectional view taken along line 3-3 in FIG.
FIG. 4 is a cross-sectional view corresponding to FIG. 3 of the second embodiment.
FIG. 5 is a cross-sectional view corresponding to FIG. 3 of a conventional example.
[Explanation of symbols]
12 ... intake passage 13 ... intake passage body 14 ... throttle valve 17 ... valve shaft 17a ... step 17b ... screw shaft 19 ... throttle lever 20 ... input lever 28 ... Ball bearing 28a ... Ball bearing inner rings 30A, 30B ... Distance collars 32A, 32B ... Lever collar 35 ... Operating force transmission spring 36 ... Return spring 37 ... Washer 38... Collar part 39 as washer holding means... Washer holding means 40... Cylindrical part 41.

Claims (4)

An intake passage body (13) that forms the intake passage (12), an annular stepped portion (17a) facing outward, and a screw shaft portion (17b) protruding from the center of the stepped portion (17a) on one end side A valve shaft (17) that is rotatably supported by the intake passage body (13) with at least one end protruding from the intake passage body (13), and the opening degree of the intake passage (12) is controlled. A butterfly throttle valve (14) which is fixed to the valve shaft (17) as possible, a ball bearing (28) provided between the intake passage body (13) and the valve shaft (17), and the ball bearing ( A cylindrical distance collar (30A, 30B) that surrounds the valve shaft (17) with an inner end abutting against an outer surface of an inner ring (28a) included in the inner shaft (28a), and a screw shaft portion of the valve shaft (17) ( 17b) The distance collar (30A, 30B) that is connected to the outer end of the distance collar (30A, 30B) and the throttle lever (19) can be relatively rotated in a limited range to enable the distance collar (30A, 30B) 30B) and a cylindrical lever collar (32A, 32B), which is fixed to the lever collar (32A, 32B) so that an operating force can be input, and is disposed on the inner side of the throttle lever (19). An input lever (20), an operating force transmission spring (35) for transmitting an operating force from the input lever (20) to the throttle lever (19), and the throttle valve on the side where the throttle valve (14) is closed. The spring force for urging the lever (19) and the lever collar (32A, 32B) approaching the throttle lever (19) A coil-like return spring (36) that exerts a spring force to urge the lever collar (32A, 32B) to surround the lever collar (32A, 32B), the throttle lever (19), and the lever collar (32A, 32B) is sandwiched between one of the throttle lever (19) and the distance collar (30A, 30B) and the lever collar (32A, 32B) to ensure relative sliding of the valve shaft (17). In an intake air amount control device comprising a synthetic resin washer (37) disposed substantially coaxially, the washer (37) is held by holding the inner periphery of the washer (37) on the outer periphery of the distance collar (30A, 30B). ) Including washer holding means (38, 39) for arranging the valve shaft substantially coaxially with the valve shaft (17). Place. The washer holding means is a flange (38) projecting radially outward from the outer end of the distance collar (30A) and abutting against the inner surface of the throttle lever (19), and has an outer periphery of the distance collar (30A). The intake air amount control according to claim 1, wherein the washer (37) formed in a surrounding ring shape is sandwiched between an inner surface of the flange portion (38) and an outer end surface of the lever collar (32A). apparatus. The washer holding means (39) is formed in a ring shape surrounding the outer periphery of the distance collar (30B) and is sandwiched between the outer end surface of the lever collar (32B) and the inner surface of the throttle lever (19). A cylindrical portion (40) integrally connected to the inner periphery of (37) and extending on the opposite side of the throttle lever (19); and the cylindrical portion (40) can be inserted into the outside of the lever collar (32B). The intake air amount control device according to claim 1, further comprising a recess (41) provided on an inner periphery of the end portion. The intake air amount control device according to claim 3, wherein the cylindrical portion (40) is lightly press-fitted into the concave portion (41).

Images