JP4673693B2 - Tandem valve type throttle body - Google Patents

Description

  The present invention relates to a throttle body that controls the amount of air flowing toward an engine, and in particular, a main throttle valve that is mechanically opened and closed by an accelerator in an intake passage that is formed through the throttle body, and a main throttle valve The present invention relates to a tandem valve type throttle body in which a sub-throttle valve that is electrically opened and closed by a motor is disposed in a further upstream intake passage.

  Such a tandem valve type throttle body is disclosed in Japanese Patent Application Laid-Open No. 2003-83171 filed by the present applicant.

  In such a tandem valve type throttle body, an intake passage is drilled through the throttle body, and a main throttle valve is attached to a main throttle valve shaft that is mechanically operated by a driving vehicle to open and close the intake passage. Is done. A sub-throttle valve is attached to a sub-throttle valve shaft that is electrically rotated by a motor in the intake passage upstream of the main throttle valve, and the intake passage upstream of the main throttle valve is electrically connected by the sub-throttle valve. Open and close.

On the other hand, an actuator case is formed by a gear case and a motor case. A motor and a gear are arranged in the actuator case. The rotation of the motor is decelerated by the gear and the sub throttle valve shaft is rotated by the output gear. Thus, the sub throttle valve electrically opens and closes the intake passage upstream of the main throttle valve.
JP 2003-83171 A

  According to such a tandem valve type throttle body, as shown in FIG. 2 of the publication, the motor is accommodated in the motor case, the gear is accommodated in the gear case, and the motor case and the gear case are arranged at the open ends. In this manner, an actuator case is formed, and the motor and the gear portion are accommodated in the actuator case to form a motor actuator.

  A bearing boss insertion hole is formed in the left end of the gear case, and a bearing boss formed so as to protrude rightward from the throttle body is inserted into the bearing boss insertion hole, whereby the motor actuator is connected to the throttle body. And the output gear is connected to the end of the sub throttle valve shaft.

When the motor rotates, the rotation of the motor is transmitted from the motor gear attached to the output shaft of the motor to the output gear, the rotation is decelerated, and the decelerated rotation is transmitted from the output gear to the sub throttle valve shaft. Thus, the sub throttle valve shaft can be decelerated and rotated according to the rotation of the motor, so that the opening degree of the sub throttle valve can be controlled to an appropriate opening degree by the motor. (In the above, the left and right are the same as in FIG. 2, and the names have been changed to new names.)
According to such a conventional tandem valve type throttle body, the bearing boss insertion hole is formed in the left end of the gear case, and the gear and the motor are arranged to the right from the bearing boss insertion hole.

  According to the above, since the heavy motor is arranged on the right side of the gear portion formed of a synthetic resin material and relatively light, the center of gravity of the entire motor actuator is greatly separated from the bearing boss insertion hole to the right. A large bending moment in the clockwise direction in FIG. 2 of the publication is applied to the bearing boss insertion hole of the gear case. Therefore, many man-hours for development, such as a vibration resistance test, are required to set the thickness, strength, and bearing length of the bearing boss insertion hole.

  In addition, according to the above, the motor including the gear protrudes greatly from the side wall of the throttle body in the right direction. This is particularly the case where the throttle body is disposed so as to be directly exposed and the two-wheeled vehicle on which the occupant rides is laid. The degree of freedom of mounting is hindered.

  Furthermore, when a motor actuator according to a tandem valve type multiple throttle body in which a plurality of throttle bodies are arranged on the side is adopted, the motor actuator is a sub-throttle of the outermost throttle body constituting the multiple throttle body. According to this, rotation of the output gear of the motor actuator is directly transmitted only to the outermost sub throttle valve shaft, and the sub throttle valve shaft in the other throttle body is All will be rotated indirectly. In addition, the overall width of the multiple throttle body is increased. There is a problem.

  The present invention has been made in view of the above problems, and a gear case in which a gear portion is housed and a motor case in which a motor is housed are connected to each other at open ends. The case is a tandem valve type throttle body that is inserted into and supported by the throttle body through a bearing boss insertion hole formed in the motor case. In particular, a bending moment by the motor is applied to the bearing boss insertion hole of the motor case. Providing a tandem valve type throttle body that is reduced and has high vibration resistance, and that the lateral length of the throttle body in the longitudinal direction of the sub throttle valve shaft can be shortened. The main purpose is to provide a body. Another object of the present invention is to provide a tandem valve type multiple throttle body equipped with a suitable motor actuator that is mounted on a multiple throttle body in which a plurality of throttle bodies are arranged on the side.

To achieve the above object, the present invention provides a main throttle valve attached to a mechanically operated main throttle valve shaft and an auxiliary throttle valve supported by the throttle body in an intake passage that penetrates the throttle body. A tandem valve type throttle body, which is provided in an intake passage upstream of a main throttle valve and disposed in an intake passage upstream of a main throttle valve and is rotated by a motor. A motor case having a bearing boss insertion hole that protrudes from a bearing boss that supports one end of the shaft and fits on the outer periphery of the bearing boss is positioned at the bottom of the motor case and closer to the intake passage. The end of the gear case is formed so as to face the opposite side of the throttle body, and the opening end of the gear case whose bottom is shallower than the motor case is bolted to the opening end of the motor case. The case and the motor case are bolted to the throttle body, and the motor is arranged in the motor case, and the gear part that decelerates the rotation of the output shaft of the motor and transmits it to the sub throttle valve shaft is arranged in the gear case. and, output gear the gear unit, a motor gear is fixed to the output shaft, and an intermediate gear that will be supported by a support shaft supported at both ends to the motor case and the gear case, which is fixed to the sub-throttle valve shaft The intermediate gear is formed in parallel in two stages along the longitudinal direction of the support shaft, with a large-diameter intermediate gear meshing with the motor gear and a small-diameter intermediate gear meshing with the output gear. The small-diameter intermediate gear is arranged on the opening end side of the gear case, and the motor projects from the opening end of the motor case into the gear case so that the large-diameter intermediate teeth Of the first, characterized in that arranged close to the side surface of the opening end side of the gear case.

  According to the present invention, in addition to the first feature, the throttle body and the second throttle body are arranged such that the sub-throttle valve shafts are coaxially arranged with each other, and the motor case and the gear between the throttle bodies. The bearing bosses that are juxtaposed so as to sandwich the case and project from one side wall of the second throttle body facing the throttle body to support the sub throttle valve shaft on the second throttle body side are fitted. A second feature is that a second bearing boss insertion hole is provided in the gear case, the output gear is connected to the sub throttle valve shafts of the two throttle bodies, and the two throttle bodies are bolted to each other.

  According to the first aspect of the present invention, a motor having a bearing boss insertion hole that projects from a bearing boss that supports one end of the sub-throttle valve shaft on one side wall of the throttle body and fits to the outer periphery of the bearing boss. The case is formed so that the bottom part is located on the intake passage side from the one side wall and the opening end faces the side opposite to the throttle body. The open end of the shallow gear case is bolted, and the gear case and motor case are bolted to the throttle body, the motor is placed in the motor case, and the rotation of the output shaft of the motor is reduced in the gear case. By arranging the gear portion that transmits to the sub throttle valve shaft, the center of gravity of the motor housed in the motor case can be drawn toward the opening end side of the motor case. In, according to when the bearing boss insertion hole is bored open to the open end of the motor case and inserted in the bearing boss of the throttle body can greatly reduce the bending moment by the motor acting on the bearing boss insertion hole. According to the above, the thickness of the bearing boss insertion hole portion of the motor case and the increase in the bearing length are suppressed, and the tandem valve type throttle body can be reduced in weight and size. In addition, the motor having a large physique is arranged toward the center side of the intake passage of the throttle body, whereby the overall width along the longitudinal axis direction of the sub throttle valve shaft of the throttle body can be shortened.

Further, in addition to the above, it is secured to the gear unit, a motor gear which is fixed to the output shaft, and an intermediate gear that will be supported by a support shaft supported at both ends to the motor case and the gear case, the sub throttle valve shaft The intermediate gear includes a large-diameter intermediate gear that meshes with the motor gear, and a small-diameter intermediate gear that meshes with the output gear, and is formed in parallel in two stages along the longitudinal direction of the support shaft. The small-diameter intermediate gear is arranged on the opening end side of the gear case, and the motor is protruded into the gear case from the opening end of the motor case, so that the side surface of the large-diameter intermediate gear on the opening end side of the gear case The motor gear rotation can be reduced in two stages and output from the output gear toward the sub-throttle valve shaft, thereby improving the controllability of the sub-throttle valve shaft by the motor. Not only can you The distance between the center of the motor and the center of the output gear can be reduced. According to this, the bending moment by the motor with respect to the bearing boss insertion hole of the motor case is further reduced, and the vibration resistance of the motor and the gear part is improved. In particular, it is possible to provide a tandem valve type throttle body suitable for two-wheeled vehicles, three-wheeled buggy vehicles, outboard motors, and the like used in environments with severe vibration conditions compared to four-wheeled vehicles. Further, according to the fact that the entire width of the throttle body in the longitudinal axis direction of the sub throttle valve shaft can be shortened, the mountability to a two-wheeled vehicle in which the throttle body is disposed between both feet of the occupant can be improved.

  According to the second feature of the present invention, when the motor case and the gear case are arranged between the opposing surfaces of the two throttle bodies arranged side by side, the pitch of both throttle bodies can be effectively shortened. The full width W of the throttle body in the longitudinal axis direction of the sub-throttle valve shaft of the tandem valve type multiple throttle body can be shortened, which can greatly improve the degree of freedom of mounting in a narrow storage space such as a motorcycle.

  A first embodiment of a tandem valve type throttle body according to the present invention will be described below with reference to FIG.

  A is a motor actuator that includes a gear part G and a motor M inside, and the rotation of the motor M is decelerated by the gear part G and output. Reference numeral 1 denotes a gear case having a gear housing recess 1a inside, the depth of the bottom of which is shallower than a motor case 3 to be described later, and its open end 1b is directed rightward. The gear part G is arrange | positioned in the gear accommodation recessed part 1a. The gear portion G is composed of a motor gear G1, an intermediate gear G2, and an output gear G3 connected to the output shaft Mb of the motor M from the upper side to the lower side. A large-diameter intermediate gear G21 and a small-diameter intermediate gear G22 are formed in parallel in two stages along the longitudinal direction XX, and the small-diameter intermediate gear G22 is disposed on the opening end 1b side of the gear case 1.

  Further, the output gear G3 is provided with a connection hole G3a having a D-shaped cross section for inserting a sub throttle valve shaft, which will be described later, toward the side. Reference numeral 1c denotes a first mounting boss provided in the vicinity of the opening end 1b of the gear case 1, and a first mounting hole 1d is formed through the first mounting boss 1c toward the opening end 1b. .

Reference numeral 3 denotes a motor case having a motor housing recess 3a. The bottom of the motor case is located on the intake passage 7a side of the throttle body 6 from one side wall of the throttle body 6 described later, and the opening end 3b is the throttle body 6. Directed to the opposite side. A bearing boss insertion hole 3d is formed below the motor case 3 so as to face the output gear G3 and extend from the opening end 3b of the motor case 3 toward the opposite side surface 3c (right side in FIG. 1). The The motor M is inserted and disposed in the motor housing recess 3a of the motor case 3. In this state, the opening end 1b of the gear case 1 and the opening end 3b of the motor case 3 are brought into contact with each other, and the motor actuator A Is formed.
1 of the motor M protrudes into the gear housing recess 1a on the left side from the opening end 3b of the motor case 3, and the left side surface Ma is a side surface G21a on the opening end side of the large-diameter intermediate gear G21. (Equivalent to the right side surface of the large-diameter intermediate gear in FIG. 1)

Further, the bearing boss insertion hole 3d of the motor case 3 is disposed facing the output gear G3. (At least the bearing boss insertion hole 3d faces the connection hole G3a of the output gear G3)
Reference numeral 3e denotes a second mounting boss provided in the vicinity of the opening end 3b of the motor case 3. The second mounting boss 3e is drilled through the second mounting hole 3f toward the opening end 3b. Is done.

  In the motor actuator A, a mounting boss 4 is formed by the first mounting boss 1c and the second mounting boss 3e, and a concentric mounting hole 5 is formed by the first mounting hole 1d and the second mounting hole 3f. The

  Reference numeral 6 denotes a throttle body having an intake passage 7 formed through the inside thereof. The intake passage 7 is mechanically controlled by a main throttle valve (not shown), and is upstream of the main throttle valve (an air cooler close to the atmosphere). The sub-throttle valve 8 is arranged in the intake passage 7a (referred to as the side) to control the opening of the upstream intake passage 7a.

  The sub-throttle valve 8 is attached to a sub-throttle valve shaft 9 that is rotatably supported by the throttle body 6 across the intake passage 7a. The left end portion of the sub-throttle valve shaft 9 has a throttle body. 6 is supported by a bearing boss 6a formed on one side wall. The motor actuator is attached to the throttle body 6 by the following. The outer periphery of the bearing boss 6a of the throttle body 6 is inserted and supported in a bearing boss insertion hole 3d formed in the motor case 3 of the motor actuator A. At this time, the bearing boss 6a protrudes leftward from the left end surface 6a1. A projecting end portion 9a having a D-shaped cross section formed at the left end of the sub throttle valve shaft 9 is inserted into and connected to the connection hole G3a of the output gear G3.

  Further, a mounting boss 4 including a first mounting boss 1c and a second mounting boss 3e is formed at the lower end of the motor actuator A in the figure, and is formed by a first mounting hole 1d and a second mounting hole 3f. A bolt T is inserted into the mounting hole 5, and the motor actuator A is screwed and fixed to the left end of the throttle body 6 by screwing the bolt T toward the throttle body 6.

  According to such a tandem valve type throttle body, the rotation of the motor M is decelerated by the motor gear G1, the intermediate gear group G2, and the output gear G3, and the decelerated rotation of the output gear G3 is caused by the sub-throttle valve shaft 9 through the connection hole G3a. The sub-throttle valve 8 is controlled to open and close by the motor M.

  Here, in the intermediate gear group G2, the large-diameter intermediate gear G21 and the small-diameter intermediate gear G22 are formed in parallel in two stages along the longitudinal direction XX of the support shaft 2, so that the rotation of the motor M is The motor gear G1 and the large-diameter intermediate gear G21 are decelerated by one step, and the small-diameter intermediate gear G22 and the output gear G3 are decelerated by two steps.

  According to the above, since the rotation of the motor gear G1 is decelerated by two stages and the rotation of the sub throttle valve shaft 9 is controlled via the output gear G3, the rotation controllability of the sub throttle valve 8 can be greatly improved. Further, according to the above, when the motor is subjected to two-stage deceleration, the small-diameter intermediate gear G22 and the large-diameter intermediate gear G21 of the intermediate gear group are formed in two stages in parallel along the longitudinal direction XX of the support shaft 2. Therefore, the distance B between the center of the motor M and the center of the output gear G3 can be reduced. According to this, the bending moment by the motor M with respect to the bearing boss insertion hole 3d of the motor case 3 can be reduced. Suitable for motorcycles with severe vibration conditions.

Also, the left side surface Ma of the motor M to be housed and arranged in the motor case 3, as well as projects from the open end 3b of the motor case 3 in the gear housing recess 1a on the left side of the large-diameter intermediate gear G21, the open end 3b It is arranged in the vicinity of the side surface G21a.

  According to the above, the center of gravity of the motor M arranged in the motor case 3 can be drawn toward the opening end 3b side of the motor case 3, and the bearing boss insertion hole 3d opened in the opening end 3b of the motor case 3 is provided in the throttle body 6. The bending moment due to the motor M applied to the bearing boss insertion hole 3d can be greatly reduced, and the thickness and the bearing length of the bearing boss insertion hole 3d can be set very easily. Further, according to the above, the gear case 1 is arranged on the outer side (in the direction away from the throttle body 6) with the contact surface of the opening end 1b of the gear case 1 and the opening end 3b of the motor case 3 as a reference, and the inner side Since the motor case 3 is disposed on the (throttle body 6 side), the motor M having a large physique relative to the gear portion G can be disposed in the projection surface of the throttle body 6, and according to this, the sub-throttle valve shaft The total width W including the motor actuator A of the throttle body 6 in the direction of the longitudinal axis 9 can be reduced.

  As described above, according to the tandem valve type throttle body of the present invention, the rotation of the motor is decelerated by two stages, and the rotation controllability of the sub throttle valve 8 can be greatly improved. Further, the distance B between the center of the motor M and the center of the output gear G3 can be reduced, and the center of gravity of the motor M can be drawn toward the opening end 3b side of the motor case 3, whereby the bearing boss insertion hole 3d of the motor case 3 can be obtained. Can be greatly reduced, and is particularly suitable as a tandem valve type throttle body mounted on a motorcycle having severe vibration conditions.

  Further, according to the fact that the motor M having a large physique is disposed on the throttle body 6 side from the contact portion of both opening ends and on the projection surface of the throttle body 6, the full width including the motor actuator A of the throttle body 6 is obtained. W can be reduced, and the mountability to a two-wheeled vehicle that is limited to a narrow range of the storage space can be improved.

Next, a second embodiment of the tandem valve type throttle body of the present invention will be described with reference to FIG.
This embodiment is a multiple throttle body in which a plurality of throttle bodies are arranged on the side, and only the parts different from FIG. 1 will be described, and the same structural parts are denoted by the same reference numerals and the description thereof is omitted. In this example, a throttle body 10 on one side is arranged on the right side in FIG. 2, and a throttle body 20 on the other side is arranged on the left side in this example. In the intake passage 11a of the throttle body 10 on the one side and upstream of the main throttle valve, the sub throttle valve shaft 12 on the one side is rotatably supported and arranged. The side sub throttle valve 13 is attached to the one side sub throttle valve shaft 12 to open and close the intake passage 11a.
The left end portion of the sub throttle valve shaft 12 on one side is further leftward than the left end surface 10a1 of a bearing boss 10a (hereinafter referred to as a first bearing boss 10a) formed on the left side wall of the throttle body 10 on one side. A first protruding end portion 12a having a D-shaped cross section is formed at the protruding left end.

  The throttle body 20 on the other side is disposed on the left side of the throttle body 10 on the one side, and is located on the intake passage 21a that is the intake passage 21 and upstream of the main throttle valve. The shaft 22 is rotatably supported across the shaft, and the other side sub-throttle valve 23 is attached to the other side sub-throttle valve shaft 22 to open and close the intake passage 21a.

  The right end portion of the other side sub-throttle valve shaft 22 is further to the right than the right end surface 20a1 of a bearing boss 20a (hereinafter referred to as a second bearing boss 20a) formed on the right side wall of the throttle body 20 on the other side. A second protruding end 22a having a D-shaped cross section is formed at the protruding right end. The throttle body 10 on one side and the throttle body 20 on the other side are arranged side by side with the sub-throttle valve shafts 12 and 22 arranged coaxially. That is, the left end surface 10a1 of the first bearing boss 10a of the throttle body 10 on one side and the right end surface 20a1 of the second bearing boss 20a of the throttle body 20 on the other side are arranged to face each other.

  Reference numeral 14 denotes a first mounting boss that protrudes leftward from the throttle body 10 on one side. Reference numeral 24 denotes a second mounting boss that protrudes rightward from the throttle body 20 on the other side. The throttle bodies 10 and 20 are integrally connected to each other by connecting the first and second connection bosses 14 and 24 with bolts 7.

  Next, the motor actuator A will be described. The motor actuator A is the same as the motor actuator shown in FIG. 1 except for the following differences.

  Only different parts will be described. Under the motor case 3, the first bearing boss insertion hole 15 faces the right side surface of the output gear G3 and extends from the opening end 3b of the motor case 3 toward the opposite side surface 3c (right side in FIG. 2). Is drilled. A second bearing boss insertion hole 25 faces the left side surface of the output gear G3 below the gear case 1 and extends from the opening end 1b of the gear case 1 toward the opposite side surface 1c (left side in FIG. 2). It is drilled through. The first bearing boss insertion hole 15 and the second bearing boss insertion hole 25 are formed concentrically.

  The motor actuator A is disposed between the opposing surfaces of the adjacent throttle body 10 on one side and the throttle body 20 on the other side, and is attached as follows.

  The outer periphery of the first bearing boss 10a of the throttle body 10 on one side is inserted into and supported by the first bearing boss insertion hole 15 formed in the motor case 3 of the motor actuator A. At this time, the first bearing boss 10a A first projecting end portion 12a having a D-shaped cross section formed at the left end of one side sub throttle valve shaft 12 projecting leftward from the left end surface 10a1 is inserted from the right into the connection hole G3a of the output gear G3. Connected.

  On the other hand, the outer periphery of the second bearing boss 20a of the other throttle body 20 is inserted into and supported by the second bearing boss insertion hole 25 formed in the gear case 1 of the motor actuator A. At this time, the second bearing boss is inserted. A second projecting end 22a having a D-shaped cross section formed at the right end of the other sub throttle valve shaft 22 projecting to the right of the right end surface 20a1 of 20a is inserted from the left into the connection hole G3a of the output gear G3. Connected.

  In addition, in the figure of the motor actuator A, a mounting hole 5 formed by a first mounting hole 1d and a second mounting hole 3f inside a mounting boss 4 formed by a first mounting boss 1c and a second mounting boss 3e formed at the lower end. A bolt T is inserted therein, and the bolt T is screwed toward the throttle body 10 on one side, whereby the motor actuator A is screwed and fixed to the left end of the throttle body 10 on one side.

  Furthermore, the right end surface 24a of the second connecting boss 24 of the other throttle body 22 is brought into contact with the left end surface 14a of the first connecting boss 14 of the throttle body 10 on one side. Then, a bolt T is inserted into the first connecting boss 14, and the bolt is screwed toward the first connecting boss 14 of the throttle body 10 on one side to thereby throttle the throttle body 10 on one side and the throttle body 20 on the other side. Are arranged and fixed next to each other, and the motor actuator A is fixedly arranged between the opposing surfaces of the throttle body 10 on one side and the throttle body 20 on the other side.

  According to the above, the rotation of the motor M is decelerated by the motor gear G1, the intermediate gear group G2, and the output gear G3, and the decelerated rotation of the output gear G3 is the first of the sub throttle valve shaft 12 on the one side from the connection hole G3a. 1 is transmitted to the projecting end portion 12a, whereby the sub throttle valve 13 on one side of the throttle body 10 on one side is controlled to open and close by the motor M.

  On the other hand, the decelerated rotation of the output gear G3 is simultaneously transmitted to the second projecting end 22a of the other side sub throttle valve shaft 22 through the connection hole G3a, whereby the other side sub throttle valve of the other side throttle body 20 is transmitted. The motor M is also controlled to open and close in synchronism with the sub throttle valve 13 on the one side.

  As described above, in the tandem valve type throttle body in which the throttle body 10 on one side and the throttle body 20 on the other side are disposed adjacent to each other and the motor actuator is disposed between the opposing side surfaces. As in the first embodiment, the rotation of the motor M is decelerated by two stages, and the rotation controllability of the sub throttle valve can be greatly improved.

  In addition, the distance B between the center of the motor M and the center of the output gear G3 can be reduced, and the center of gravity of the motor M can be drawn toward the opening end 3b side of the motor case 3. The bending moment by the motor with respect to the bearing boss insertion hole 15 and the second bearing boss insertion hole 25 of the gear case 1 can be greatly reduced, and the same effect as in the first embodiment can be achieved.

According to the second embodiment, the following effects can be further achieved.
The left end Ma of the motor M arranged in the motor case 3 is protruded into the gear case 1 from the opening end 3b of the motor case 3, and on the side surface G21a on the opening end side of the large-diameter intermediate gear G21 of the intermediate gear group G2. Since they are arranged close to each other, the right side surface 3h of the motor case 3 can be drawn to the left in FIG. 2, and the large-diameter intermediate gear G21 and the small-diameter intermediate gear G22 are arranged in two stages in parallel. Even when the intermediate gear group G2 is adopted, the length L of the motor M and the gear portion G in the longitudinal direction of the output shaft Mb is not affected at all by the gear width of the small-diameter intermediate gear G22. Can be determined shortly.
According to the above, the distance R between the left side surface 1h of the gear case 1 and the right side surface 3h of the motor case 3 can be reduced, and the distance from the open end 3b of the motor case 3 to the right side surface 3h of the motor case 3 is shortened. In particular, when the motor actuator A is disposed between the opposing surfaces of the throttle bodies 10 and 20 provided next to each other, the pitch P of both the throttle bodies 10 and 20 can be effectively shortened, and the tandem valve type The full width W of the throttle body in the longitudinal axis direction of the sub throttle valve shaft of the multiple throttle body can be shortened, which can greatly improve the degree of freedom of mounting in a narrow storage space such as a motorcycle.

  The motor case 3 is inserted and supported by the first bearing boss 10a of the throttle body 10 through the first bearing boss insertion hole 15, and the gear case 1 is inserted and supported by the second bearing boss insertion hole 25. By being inserted and supported by the second bearing boss 20a of the throttle body 20, the motor actuator A can be supported more firmly between the throttle bodies 10 and 20.

  Furthermore, in addition to the above, the fact that the motor actuator A is screwed to the throttle body by the bolt 7 through the mounting hole 5 formed in the mounting boss 4 makes it possible to more stably and reliably throttle the motor actuator A. It can be attached to the body and is particularly suitable for use in motorcycles with strong vibrations.

  Furthermore, the output gear G3 directly applies a rotational force to the one side sub-throttle valve shaft 12 and the other side sub-throttle valve shaft 22, so that both sub-throttle valve shafts can be made more synchronous. In addition, the rotation can be reliably controlled.

  Even when the one side sub-throttle valve shaft and the other side sub-throttle valve shaft are set as a single shaft and the intermediate portion thereof is connected to the connection hole G3a of the output gear G3, the output gear G3 is directed left and right. Thus, a rotational force can be applied to achieve the same effect as described above.

  Further, in this embodiment, two throttle bodies are arranged on the side, but the number of throttle bodies is not limited to that and can be applied to a triple or quadruple throttle body.

1 is a longitudinal sectional view showing a first embodiment of a tandem valve type throttle body according to the present invention. The longitudinal cross-sectional view which shows 2nd Example of the tandem valve type | mold throttle body which becomes this invention.

DESCRIPTION OF SYMBOLS 1 Gear case 1a Gear accommodation recessed part 1b Gear case opening end 2 Support shaft 3 Motor case 3a Motor accommodation recessed part 3b Motor case opening end 3d, 15 Bearing boss insertion hole 4 Mounting boss 5 Mounting hole 7, 11 Intake passage 6, 10 Throttle body 6a, 10a Bearing boss 8, 13 Sub-throttle valve 20 Second throttle body 20a Second throttle body bearing boss 9, 12 Sub-throttle valve shaft 22 Sub-throttle valve shaft on the second throttle body side 25 Gear case bearing boss insertion hole G gear unit G1 motor gear G2 intermediate gears G21 large-diameter intermediate gear G22 small intermediate teeth car
G21a Side surface on the open end side of the large diameter intermediate gear G3 Output gear M Motor

Claims (2)

A main throttle valve attached to a mechanically operated main throttle valve shaft and a throttle body (6, 10) are supported in an intake passage (7, 11) penetrating the throttle body (6, 10). A sub-throttle valve (8, 13) attached to the sub-throttle valve shaft (9, 12) and disposed in the intake passage (7, 11) upstream of the main throttle valve and rotated by a motor (M). In a tandem valve type throttle body comprising
A bearing boss (6a, 10a) that supports one end of the sub-throttle valve shaft (9, 12) protrudes from one side wall of the throttle body (6, 10) and is fitted to the outer periphery of the bearing boss (6a, 10a). The bottom of the motor case (3) having the bearing boss insertion holes (3d, 15) to be mated is positioned on the intake passage (7, 11) side from the one side wall, and the opening end (3b) is the throttle body ( 6, 10) facing the opposite side to the opening end (3b) of the motor case (3) and the opening end of the gear case (1) whose depth at the bottom is shallower than the motor case (3) ( 1b), and the gear case (1) and the motor case (3) are bolted to the throttle body (6, 10), and the motor (M) is mounted in the motor case (3). There is a motor in the gear case (1). M) gear portions (G) that decelerate the rotation of the output shaft (Mb) and transmit it to the sub-throttle valve shafts (9, 12) are arranged, respectively, and this gear portion (G) is disposed on the output shaft (Mb). a motor gear (G1) being fixed to the motor casing (3) and the support shaft supported at both ends on the gear casing (1) and the intermediate gear that will be supported by the (2) (G2), the sub-throttle valve shaft ( 9 and 12) and a large-diameter intermediate gear (G2) meshing with the motor gear (G1), and the output gear (G3). ) And a small-diameter intermediate gear (G2) that is formed in parallel along the longitudinal direction (XX) of the support shaft (2) in two stages. Arranged on the open end (1b) side of the gear case (1), the motor (M) is connected to the motor (M). A side surface (G21a) of the large-diameter intermediate gear (G21) on the open end (1b) side of the gear case (1) by projecting into the gear case (1) from the open end (3b) of the case (3). Tandem valve type throttle body, characterized by being placed close to The tandem valve type throttle body for a motorcycle according to claim 1,
The throttle body (10) and the second throttle body (20) are arranged such that the sub-throttle valve shafts (12, 22) are arranged coaxially with each other, and the motor is interposed between the throttle bodies (10, 20). The second throttle body is juxtaposed so as to sandwich the case (3) and the gear case (1), and protrudes from one side wall of the second throttle body (20) facing the throttle body (10). A second bearing boss insertion hole (25) into which a bearing boss (20a) supporting the sub throttle valve shaft (22) on the (20) side is fitted is provided in the gear case (1), and both the throttle bodies (10 , 20) is connected to the output gear (G3) to the sub-throttle valve shaft (12, 22), and the throttle bodies (10, 20) are bolted to each other. Body.

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