JP2013032734A - Throttle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a throttle device mounted in a multi-cylinder engine of a two-wheel vehicle or the like which is easily disposed in a limited space, in which the throttle device, an accelerator cable joining an accelerator grip to an accelerator operation amount detection mechanism can be easily routed.SOLUTION: The throttle device is provided including; a throttle body 10 which demarcates throttle bores 11; throttle valves 20; a throttle shaft 30; a drive mechanism 40 which rotationally drives the throttle shaft, a plurality of fuel injection valves 50 which are arranged and mounted in one side part of the throttle body in order to inject fuel into the throttle bores; and the accelerator operation amount detection mechanism 70 which is mounted in the throttle body in order to detect the operation amount of an accelerator grip via the accelerator cable. The accelerator operation amount detection mechanism 70 is disposed on the same side as the one side part in which the plurality of the fuel injection valves are arranged. Consequently, the throttle device can be easily disposed in the limited space of the two-wheel vehicle and the accelerator cable can be easily routed.

Description

  The present invention relates to a throttle device mounted on an engine mounted on a motorcycle or the like, and more particularly to a throttle device that opens and closes a throttle valve by a drive source such as a motor.

  As a conventional throttle device, a throttle body that defines a plurality of throttle bores communicating with an intake passage of an engine, a plurality of throttle valves that open and close the throttle bore, a throttle shaft that rotatably supports a plurality of throttle valves, and a throttle shaft , A plurality of fuel injection valves mounted on the throttle body for injecting fuel into each throttle bore, and the amount of rotation of the accelerator grip in conjunction with the accelerator grip provided on the handle of the motorcycle. The throttle opening detection mechanism mounted on the throttle body on the opposite side of the fuel injection valve with the throttle bore being detected, and the rotation of the accelerator opening detection mechanism and the throttle shaft disposed on one end side of the throttle shaft Interlocking mechanism etc. What had example is known (e.g., see Patent Document 1).

By the way, when this throttle device is mounted on a motorcycle engine, in a horizontal type in which the throttle bore is arranged in a substantially horizontal direction, the fuel injection valve is generally positioned on the upper side. Therefore, the accelerator cable (outer cable, inner cable) connected to the accelerator opening detection mechanism is once extended downward, bent in a U-shape and extended upward, and the frame of the motorcycle. It will be connected to the accelerator grip along the line.
Such a layout of the accelerator cable requires a space for arranging a U-shaped bent portion, and a U-shaped region accumulates water drops that have entered the accelerator cable (outer cable). There is a risk of causing rust, freezing and the like.

  On the other hand, in the downdraft type in which the throttle bore is arranged substantially vertically, since the throttle body is generally arranged close to the engine, it is difficult to install such a throttle device. In this case, the throttle body is separated from the engine to some extent to secure an extra space between the fuel injection valve and the accelerator opening detection mechanism, and the fuel injection valve and the rear of the throttle body. It is necessary to secure an extra space for arranging the other of the accelerator opening detection mechanism, and it is difficult to collect and arrange the parts with respect to the engine.

JP 2007-198355 A

  The present invention has been made in view of the above circumstances, and its object is to simplify the structure, reduce the number of parts, consolidate parts, downsize the apparatus, etc. Provided is a throttle device that can be easily arranged in a limited space in a multi-cylinder engine mounted in a vehicle and that can easily handle an accelerator cable that connects an accelerator grip and an accelerator opening detection mechanism. It is in.

A throttle device according to the present invention is supported by a throttle body that defines a plurality of throttle bores, a plurality of throttle valves that respectively open and close the plurality of throttle bores, and a plurality of throttle valves that rotate integrally. Via a throttle shaft, a drive mechanism for rotationally driving the throttle shaft, a plurality of fuel injection valves mounted on one side of the throttle body to inject fuel into a plurality of throttle bores, and an accelerator cable An accelerator opening degree detecting mechanism mounted on the throttle body for detecting the opening degree of the accelerator grip, and the accelerator opening degree detecting mechanism is arranged on the same side as one side where a plurality of fuel injection valves are arranged. ing.
According to this configuration, since the plurality of fuel injection valves and the accelerator opening detection mechanism are disposed on one side (the same side) of the throttle body that defines the plurality of arranged throttle bores, the throttle device As a result, the overall size can be reduced by integrating the parts, and the other side of the throttle body can be effectively utilized when the throttle device is mounted on the engine.
Further, when this throttle device is mounted on a motorcycle engine, the horizontal type in which the throttle bore (in the axial direction thereof) is oriented in a substantially horizontal direction is disposed once while the fuel injection valve is positioned on the upper side. There is no need to bend upward in a U-shape after extending downward, and the accelerator cable can be easily routed, and water droplets etc. can accumulate in the accelerator cable and prevent rust, freezing, etc. can do.
Also, in the downdraft type in which the throttle bore (in the axial direction thereof) is arranged in a substantially vertical direction, the other side of the throttle body is arranged close to (opposed to) the engine, and one side of the throttle body ( By arranging the multiple fuel injection valves and the accelerator opening detection mechanism) in the direction away from the engine, it is easy to handle the accelerator cable in the same way as above while achieving the integration of parts as a motorcycle. In addition, it is possible to prevent water droplets or the like from accumulating in the accelerator cable and causing rust and freezing.

The said structure WHEREIN: The structure arrange | positioned between the some fuel injection valves can be employ | adopted for the throttle opening detection mechanism in the arrangement direction of a throttle bore.
According to this configuration, by disposing the accelerator opening detection mechanism between the fuel injection valves, it is possible to arrange the accelerator opening detection mechanism closer to the throttle body, and further downsizing the entire device. Can be achieved.

The above configuration further includes a delivery pipe disposed substantially in parallel with the throttle shaft to supply fuel to the plurality of fuel injection valves, and the accelerator opening detection mechanism includes two fuel injection valves of the plurality of fuel injection valves. It is possible to adopt a configuration that is disposed in a region that does not protrude outward from the delivery pipe in the axial direction of the throttle bore.
According to this configuration, the accelerator opening detection mechanism is disposed between the fuel injection valves so as not to protrude outward from the delivery pipe in the axial direction of the throttle bore, so that the delivery pipe is used as a reference for the outer contour of the device. Thus, further downsizing of the entire apparatus can be achieved, and the accelerator cable can be more easily routed.

In the above configuration, the accelerator opening detection mechanism is configured to rotate the rotating member that connects the accelerator cable interlocked with the rotation of the accelerator grip, the sensor rotating shaft that fixes the rotating member so as to rotate integrally, and the sensor rotating shaft. A configuration including a holder that is movably supported and is detachably fixed to the throttle body, and a sensor unit that is provided on the holder and detects the rotation angle of the sensor rotation shaft can be employed.
According to this configuration, when the accelerator grip is rotated, the rotating member and the sensor rotating shaft rotate via the accelerator cable, and the sensor unit detects the rotation angle of the sensor rotating shaft, whereby the accelerator opening is detected. The
Here, since the accelerator opening detection mechanism is composed of a rotating member, a sensor rotating shaft, a holder, a sensor unit, and the like, the structure can be simplified.

In the above configuration, the sensor rotation shaft is rotatably supported by the holder via the bearing including the inner ring and the outer ring, and the sensor rotation shaft makes the inner ring engage with the outer ring and contacts one end portion of the inner ring in the axial direction thereof. The rotary member has a reduced diameter portion that defines a step to be moved, and the rotating member is fixed to the sensor rotation shaft with a spacer that is fitted on the reduced diameter portion and is in contact with the other end portion of the inner ring. be able to.
According to this configuration, the sensor rotation shaft is rotatably supported via the bearing, and the inner ring of the bearing is firmly held between the sensor rotation shaft and the rotation member with the spacer interposed therebetween. It can be shortened and its fall (tilt) can be prevented, and highly accurate detection becomes possible. Further, since the sensor rotation shaft can be shortened, the accelerator opening detection mechanism can be easily disposed between the fuel injection valves whose intervals are set according to the pitch of the throttle bores.

In the above configuration, the accelerator opening detection mechanism includes a bracket that fixes the outer cable of the accelerator cable, and the bracket is detachably fixed to the holder to adjust the wiring direction of the accelerator cable. can do.
According to this configuration, the accelerator cable can be easily routed (wired) according to various motorcycles by appropriately adjusting the mounting direction of the bracket.

In the above configuration, the plurality of fuel injection valves have a connector for electrical connection, and the accelerator opening detection mechanism has a connector for electrical connection, and the connector of the fuel injection valve and the accelerator opening detection mechanism A configuration in which the connector is oriented so as to face substantially the same direction can be adopted.
According to this configuration, when the throttle device is mounted on the engine of a two-wheeled vehicle, the wiring on the two-wheeled vehicle side can be easily connected to these connectors, and assembly on a production line or the like is facilitated.

  According to the throttle device having the above configuration, a space limited in a multi-cylinder engine mounted on a two-wheeled vehicle or the like, while achieving simplification of the structure, reduction of the number of parts, integration of parts, miniaturization of the apparatus, and the like. In addition, the accelerator cable that connects the accelerator grip and the accelerator opening detection mechanism can be easily routed.

1 is an external side view showing a two-wheeled vehicle equipped with an engine equipped with a throttle device according to the present invention. 1 is an external perspective view showing an embodiment of a throttle device according to the present invention. FIG. 3 is an external perspective view showing a state in which a part of an accelerator opening detection mechanism is cut in the throttle device shown in FIG. 2. FIG. 3 is a plan view of the throttle device shown in FIG. 2. FIG. 3 is a side view of the throttle device shown in FIG. 2. FIG. 3 is a partial cross-sectional view showing an accelerator opening detection mechanism included in the throttle device shown in FIG. 2. 1 is a schematic diagram showing a state (horizontal type) in which a throttle device according to the present invention is mounted on a multi-cylinder engine mounted on a motorcycle. 1 is a schematic diagram showing a state (downdraft type) in which a throttle device according to the present invention is mounted on a multi-cylinder engine mounted on a motorcycle.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, this throttle device is mounted on a multi-cylinder engine (here, a three-cylinder engine) mounted on a motorcycle.
As shown in FIG. 1, the two-wheeled vehicle is connected to the upstream side of the multi-cylinder engine 1, a throttle device M that is attached to a plurality of intake ports of the multi-cylinder engine 1 via a connecting member 2, and the throttle device M. An intake system 3, an accelerator grip 4 rotatably provided on the handle, an accelerator cable 5 (an outer cable 5 a and an inner cable 5 b) connected between the accelerator grip 4 and the throttle device M are provided.

  As shown in FIGS. 2 to 4, the throttle device M includes a throttle body 10 that defines a plurality (three in this case) of throttle bores 11 extending in the direction of the axis S, and a plurality of throttle bores 11 that open and close each of the throttle bores 11. (Three here) throttle valve 20, a throttle shaft 30 supported by the throttle body 10 for integrally rotating the plurality of throttle valves 20, and a throttle body 10 for rotationally driving the throttle shaft 30. The drive mechanism 40, a plurality of (here, three) fuel injection valves 50, which are arranged and mounted on one side (U side) of the throttle body 10 to inject fuel into the plurality of throttle bores 11, A delivery pipe 60 fixed to the throttle body 10 to supply fuel to the fuel injection valve 50, an accelerator An accelerator opening detection mechanism 70 mounted on one side (U side) of the throttle body 10 so as to detect the opening of the accelerator grip 4 via the cylinder 5, and a throttle body so as to detect the opening position of the throttle valve 20. 10 is provided with a position sensor 80 or the like attached to one end of the sensor 10.

As shown in FIGS. 2 to 5, the throttle body 10 includes a first body 10 </ b> A and a second body 10 </ b> B that are divided so as to be coupled by a fastening screw B <b> 1.
As shown in FIGS. 2 to 4, the first body 10A includes two throttle bores 11 arranged in the direction of the axis L of the throttle shaft 30, connecting portions 11a and 11b formed at both ends of the throttle bore 11, and a throttle shaft. The bearing hole 12 that rotatably supports 30, the two mounting portions 13 that mount the fuel injection valve 50, the boss portion 14 that mounts the accelerator opening detection mechanism 70, the case portion 15 that houses the drive mechanism 40, and the cover portion 16 and a plurality of connecting portions 17 for connecting the second body 10B.
As shown in FIGS. 2 to 5, the second body 10 </ b> B includes one throttle bore 11 arranged in the axis L direction of the throttle shaft 30, connecting portions 11 a and 11 b formed at both ends of the throttle bore 11, and a throttle shaft. A bearing hole 12 that rotatably supports 30, a single mounting portion 13 for mounting the fuel injection valve 50, a plurality of connecting portions 18 for connecting the first body 10 </ b> A, and a mounting portion for mounting the position sensor 80. 19 etc.

Here, in the throttle body 10 in a state where the first body 10A and the second body 10B are coupled, the three mounting portions 13 are arranged on one side (U side) of the throttle body 10 at equal intervals. The boss portion 14 is formed on the same side as the two mounting portions 13 and between the two mounting portions 13 with respect to the throttle bore 11 of the first body 10A.
The case part 15 and the cover part 16 are partially on the side opposite to the side where the three mounting parts 13 and the boss part 14 are arranged in the throttle body 10 in which the first body 10A and the second body 10B are coupled. It is formed to protrude.

  As described above, since the throttle body 10 is divided in the region where the drive mechanism 40 is disposed, components included in the drive mechanism 40 (such as a connecting gear connected to the throttle shaft 30) can be easily provided to the throttle shaft 30. Moreover, since the drive mechanism 40 is accommodated and enclosed by the case part 15 and the cover part 16, interference with other components etc. can be prevented and functional reliability can be ensured.

  As shown in FIG. 2, the three throttle valves 20 are disposed in the corresponding throttle bores 11 after the throttle shaft 30 is rotatably supported by the throttle body 10, and are fastened to the throttle shaft 30 by screws B <b> 2. The throttle bore 11 is opened and closed integrally with the throttle shaft 30.

The throttle shaft 30 is formed of a single shaft having a circular cross section, and in the region surrounded by the case portion 15 and the cover portion 16 of the first body 10A in the direction of the axis L, a connecting gear (not shown) of the drive mechanism 40 is provided. Are detachably connected so that the rotational driving force by the drive mechanism 40 is transmitted.
That is, the throttle shaft 30 is inserted into the bearing hole 12 of the first body 10A with a connecting gear (not shown) connected in advance, and after being inserted into the bearing hole 12 of the second body 10B, The two bodies 10B are fastened and fixed to the first body 10A using the screws B1, so that the two bodies 10B are supported so as to be rotatable about the axis L with respect to the throttle body 10.

The drive mechanism 40 rotates the throttle shaft 30, and includes a motor (not shown) housed in the case portion 15 and the cover portion 16, and a gear train (not shown) for transmitting the rotational force of the motor to the throttle shaft 30. And a connecting gear that meshes with the gear train and is connected to the throttle shaft 30.
The motor is a torque motor that generates a rotational driving force (torque) by rotating within a predetermined angle range. The motor main body accommodated in the case portion 15 and the cover portion 16, a pinion directly connected to the rotation shaft, and a cover The connector part 41 etc. for performing the electrical connection fixed to the part 16 are provided.

The three fuel injection valves 50 include a main body 51 including an electromagnetic valve attached to the attachment part 13 of the throttle body 10, a connection part 52 connected to the delivery pipe 60, a connector 53 for electrical connection, and the like. The fuel is injected from the slot bore 11 toward the intake passage of the engine.
That is, as shown in FIGS. 2 to 4, the three fuel injection valves 50 are arranged at equal intervals in the arrangement direction (axis L direction) of the three throttle bores 11 on one side (U side) of the throttle body 10. It is installed in an array.
As shown in FIGS. 3 to 5, the connector 53 is oriented outward (upward in FIG. 5) in a direction (axis V) substantially perpendicular to the axis S.

As shown in FIGS. 2 to 4, the delivery pipe 60 is disposed on one side (U side) of the throttle body 10 that is substantially parallel to the throttle shaft 30 (axis L thereof) and in which three fuel injection valves 50 are arranged. It is arranged, connected to the connecting portions 52 of the three fuel injection valves 50, and fixed to the throttle body 10 with screws or the like.
The delivery pipe 60 functions as a common pipe that supplies fuel to each fuel injection valve 50.

As shown in FIGS. 2 to 4 and 6, the accelerator opening detection mechanism 70 is disposed on one side (U side) of the throttle body 10, that is, on the same side as the plurality of fuel injection valves 50, and the throttle opening detection mechanism 70. It is arranged between the two fuel injection valves 50 in the arrangement direction of the bores 11 (axis L direction).
Here, as shown in FIGS. 2 to 6, the accelerator opening detection mechanism 70 is rotated around the axis L2 by the holder 71 that is detachably fixed to the boss portion 14 of the throttle body 10 by screws B3. A sensor rotation shaft 72 that is freely supported, a bearing 73 that rotatably supports a part of the sensor rotation shaft 72, a sensor unit 74 that is provided in the holder 71 and detects a rotation angle of the sensor rotation shaft 72, and a sensor rotation shaft 72, a rotating member 75 that is fixed so as to rotate integrally with the accelerator 72 and that is connected to the accelerator cable 5 that is interlocked with the rotation of the accelerator grip, a spacer 76 that is interposed between the rotating member 75 and the bearing 73, and the rotating member 75. The holder 71 for fixing the outer cable 5a of the accelerator cable 5 and the return spring 77 held by the holder 71 so as to urge the rotation to the rest position. Fixed bracket 78, and a connector 79 or the like for electrically connecting the sensor unit 74.

When the accelerator grip 4 is rotated, the rotating member 75 and the sensor rotating shaft 72 are rotated via the accelerator cable 5, and the sensor unit 74 detects the rotation angle of the sensor rotating shaft 72. The amount of rotation, that is, the accelerator opening is detected.
Here, the accelerator opening degree detection mechanism 70 includes a holder 71, a sensor rotating shaft 72, a sensor unit 74, a rotating member 75, a return spring 77, a bracket 78, and the like. Therefore, simplification of the structure, miniaturization, etc. can be achieved.

  As shown in FIGS. 2 to 4 and 6, the holder 71 is capable of rotating a flange portion 71 a having a hole through which a screw B <b> 3 to be fixed to the boss portion 14 of the throttle body 10 and a sensor rotating shaft 72 are rotatable. A bearing hole 71b to be supported, a fitting hole 71c to which the bearing 73 is fitted, a cylindrical portion 71d to which the return spring 77 is externally fitted and held, a latching portion 71e for latching one end 77a of the return spring 77, and a sensor unit 74 Is provided with a flange portion 71f having a screw hole for fixing the screw with a screw B4.

  As shown in FIG. 6, the sensor rotation shaft 72 includes a large diameter portion 72a supported by the bearing hole 71b of the holder 71, a reduced diameter portion 72b that defines a step 72b ′ to be supported by the bearing 73, and a reduced diameter portion 72b. Further, the fixing member 72c is formed so as to be non-rotatably fitted to the rotating member 75, the washer 72c ′ is passed through and the nut 72c ″ is screwed, and the sensor unit 74 is partially connected. 72d and the like.

As shown in FIG. 6, the bearing 73 includes an inner ring 73a fitted to the reduced diameter portion 72b of the sensor rotating shaft 72, an outer ring 73b fitted to the fitting hole 71c of the holder 71, and between the inner ring 73a and the outer ring 73b. Are provided with a plurality of rolling elements 73c interposed in a freely rotatable manner.
Here, as shown in FIG. 6, the inner ring 73 a is externally fitted to the reduced diameter portion 72 b and has one end in the direction of the axis L <b> 2 in contact with the step 72 b ′ and the other end in contact with the spacer 76. Is arranged.

  The sensor unit 74 includes a movable part (not shown) connected to the connection part 72d of the sensor rotating shaft 72 and a fixed part, and the relative movement amount of both is a contact type (variable resistor etc.) or a non-contact type ( By detecting with a magnetic sensor or the like, the rotation angle of the sensor rotation shaft 72 is detected.

As shown in FIGS. 2 to 6, the rotating member 75 includes a substantially rectangular fitting hole 75 a that is externally fitted to the fixed portion 72 c, a drum portion 75 b around which the inner cable 5 b of the accelerator cable 5 is wound, and a return spring 77. The other end portion 77b of the bracket 78 includes a latching portion 75c, a contact portion 75d that abuts against the stopper portion 78b of the bracket 78, and the like.
As shown in FIG. 6, the spacer 76 is fitted on the reduced diameter portion 72 b of the sensor rotation shaft 72, and one end of the spacer 76 abuts on the other end of the inner ring 73 a of the bearing 73 in the axial direction L 2. The end portion is formed so as to contact one side surface of the rotation member 75.
The rotating member 75 is externally fitted to the fixed portion 72c of the sensor rotating shaft 72 with the spacer 76 abutting on the other end portion of the inner ring 73a being fitted to the reduced diameter portion 75b, and the washer 72c ′ and It is fixed to the sensor rotating shaft 72 using a nut 72c ″.

  Here, the sensor rotating shaft 72 is rotatably supported by the holder 71 via the bearing 73, and the inner ring 73a of the bearing 73 is firmly held between the sensor rotating shaft 72 and the rotating member 75 with the spacer 76 interposed therebetween. Therefore, it is possible to prevent the tilt (inclination) of the sensor rotation shaft 72 while shortening the sensor rotation shaft 72, and therefore, highly accurate detection is possible. Further, since the sensor rotation shaft 72 can be shortened, the accelerator opening detection mechanism 70 can be easily disposed between the fuel injection valves 50 whose intervals are set according to the pitch of the throttle bores 11.

  The return spring 77 is a torsion type coil spring as shown in FIGS. 2 to 6, and is fitted and held in the cylindrical portion 71d of the holder 71. One end 77a of the return spring 77 is attached to the latching portion 71e of the holder 71. The other end 77b is latched by the latching portion 75c of the rotating member 75, and exerts an urging force for rotating the rotating member 75 and the sensor rotating shaft 72 to a predetermined rest position and returning them. ing.

2, 4 and 5, the bracket 78 is detachably fixed to the holder 71 using a screw B5, and a fixing portion 78a for fixing the outer cable 5a of the accelerator cable 5 is rotated. A stopper 78b is provided to abut the abutting portion 75d of the member 75 to stop it at the rest position.
The fixing portion 78a serves to direct the extension direction when the accelerator cable 5 extends toward the accelerator grip. Here, as shown in FIG. 5, the fixing portion 78a is perpendicular to the axis S (axis V). The accelerator cable 5 is formed so as to be inclined at a predetermined angle toward the R side.
Here, the bracket 78 is formed so as to be fixed and attached to the holder 71 at a predetermined angle. However, in order to adjust the wiring direction (extension direction) of the accelerator cable 5, the bracket 78 is attached to the holder 71. It may be formed so that the inclination angle can be adjusted.
In this case, by appropriately adjusting the mounting direction of the bracket 78, the accelerator cable 5 according to various two-wheeled vehicles can be easily routed (wired).

The connector 79 electrically connects the accelerator opening detection mechanism 70 (sensor unit 74). As shown in FIGS. 3 to 5, the connector 79 faces outward in a direction substantially perpendicular to the axis S (axis V). (Upward in FIG. 5).
That is, the connector 79 of the accelerator opening detection mechanism 70 and the connector 53 of the fuel injection valve 50 are oriented so as to face substantially the same direction (outwardly perpendicular to the axis S).
Accordingly, when the throttle device M is mounted on the engine 1 of a motorcycle, the wiring on the motorcycle side can be easily connected to the connectors 79 and 53, and assembly on a production line or the like is facilitated.

The accelerator opening detection mechanism 70 having the above-described configuration is disposed between the two fuel injection valves 50 among the plurality of fuel injection valves 50 in the arrangement direction of the slot bores 11, and accordingly, the accelerator opening detection mechanism 70 correspondingly. 70 can be disposed close to the throttle body 10, and further downsizing of the entire apparatus M can be achieved.
Further, as shown in FIG. 5, the accelerator opening detection mechanism 70 is located outside the delivery pipe 60 between the two fuel injection valves 50 of the plurality of fuel injection valves 50 and in the axis S direction of the throttle bore 11. Since the device M can be arranged on the two-wheeled vehicle using the delivery pipe 60 as a reference of the outer contour of the device M, the layout in the two-wheeled vehicle can be easily performed. Further downsizing of the entire device M can be achieved, and the accelerator cable 5 can be more easily handled.

The position sensor 80 detects the rotation angle of the throttle shaft 30, and as shown in FIGS. 2 to 5, a sensor main body 81, a sensor main body 81 fixed to the mounting portion 19 using a screw B 6, A connector 82 that is integrally formed and oriented outward (substantially upward in FIG. 5) in a direction (axis V) perpendicular to the axis S is provided.
As the sensor body 81, a contact type or non-contact type sensor can be adopted as long as it can detect the rotation angle of the throttle shaft 30.
Since the connector 82 is oriented so as to face substantially the same direction (outwardly perpendicular to the axis S) together with the connector 79 of the accelerator opening detection mechanism 70 and the connector 53 of the fuel injection valve 50, the throttle device M Can be easily connected to the connector 82 with respect to the connector 82, and assembly on a production line or the like is facilitated.

  As described above, according to the throttle device M having the above-described configuration, the plurality of fuel injection valves 50 and the accelerator opening detection mechanism 70 are arranged on one side (the same side) of the throttle body 10 with respect to the throttle bore 11. ), The overall size can be reduced by consolidating the parts of the throttle device M, and the other side of the throttle body 10 is effectively used when the throttle device M is mounted on the engine. can do.

Further, the advantages of the throttle device M will be further described.
First, as shown in FIG. 7, when the throttle device M is mounted on a two-wheeled vehicle engine 1 (horizontal type) so that the throttle bore 11 is oriented in a substantially horizontal direction, the fuel injection valve 50 is mounted on the two-wheeled vehicle. As shown in FIG. 1, the accelerator cable 5 can be directly extended to the upper side and connected to the accelerator grip 4 while being positioned on the upper side. The accelerator cable 5 can be easily routed, and water droplets or the like can be prevented from accumulating in the accelerator cable 5 (outer cable 5a), thereby preventing rust, freezing, and the like.

  On the other hand, when the throttle device M is mounted on the motorcycle engine 1 (down draft type) so that the throttle bore 11 is oriented substantially vertically or obliquely as shown in FIG. The other side (D side) of the throttle body 10 is disposed close to (opposed to) the engine 1 and one side of the throttle body 10 (the side on which the plurality of fuel injection valves 50 and the accelerator opening detection mechanism 70 are disposed) By arranging the U side) away from the engine 1 (backward of the motorcycle), it is possible to easily handle the accelerator cable 5 in the same manner as described above while achieving the integration of parts as a motorcycle. Further, it is possible to prevent water droplets or the like from accumulating in the accelerator cable 5 (outer cable 5a) and causing rust and freezing.

Next, the operation of the throttle device will be briefly described.
First, in a state where the accelerator grip 4 is returned to the rest position, the accelerator opening detection mechanism 70 detects that the accelerator opening is zero (rest position) via the accelerator cable 5, and the drive mechanism 40 The shaft 30 and the throttle valve 20 are positioned at a rest position (an idle opening or a default opening slightly larger than the idle opening).
The position sensor 80 detects the angular position of the throttle shaft 30 at the rest position and feeds back the detection signal to the control circuit of the drive mechanism 40.

When the accelerator grip 4 is appropriately rotated, the amount of rotation (accelerator opening) is detected by the accelerator opening detection mechanism 70 via the accelerator cable 4, and the detection signal is sent to the control circuit. The drive mechanism 40 is driven and controlled based on the control signal generated from the engine to rotate the throttle shaft 30 and the throttle valve 20 to an angular position corresponding to the rotation amount of the accelerator grip 4.
Then, according to the opening degree of the throttle valve 20, air flows in the throttle bore 11 from the R side to the F side, and fuel as required is injected from the fuel injection valve 50.
The position sensor 80 detects the angular position of the throttle shaft 30 in this state and feeds back the detection signal to the control circuit.

On the other hand, when the accelerator grip 4 is returned to the original rest position, the rotation amount (accelerator opening) is detected by the accelerator opening detection mechanism 70 via the accelerator cable 4, and the detection signal is sent to the control circuit, Based on a control signal generated from the control circuit, the drive mechanism 40 is drive-controlled, and the throttle shaft 30 and the throttle valve 20 are positioned at a rest position (an idle opening or a default opening slightly larger than the idle opening).
The position sensor 80 detects the angular position of the throttle shaft 30 in this state and feeds back the detection signal to the control circuit.

  As described above, the throttle device M does not directly open / close the throttle valve 20 (and the throttle shaft 30) by the accelerator cable 5, but performs the opening / closing drive by the drive mechanism 40 and the accelerator cable 5 has the accelerator opening degree. In a two-wheeled vehicle equipped with a multi-cylinder engine equipped with a throttle device that directly opens and closes the throttle valve using the accelerator cable 5, the accelerator grip is connected to the accelerator opening detecting mechanism 70 to detect the 4 and the accelerator cable 5 can be used, only the throttle device can be replaced with the throttle device M of the present invention, and the throttle valve 20 can be driven to open and close by the drive mechanism 40.

In the above embodiment, the three throttle valves 20 and the throttle bores 11 and the three fuel injection valves 50 are shown as a plurality of throttle valves and throttle bores and a plurality of fuel injection valves. However, the present invention is not limited to this. In the configuration including two or four or more throttle valves, throttle bores, and fuel injection valves, the configuration of the present invention can be adopted.
In the embodiment described above, the accelerator opening provided with the holder 71, the sensor rotating shaft 72, the bearing 73, the sensor unit 74, the rotating member 75, the spacer 76, the return spring 77, the bracket 78, and the connector 79 as the accelerator opening detecting mechanism. Although the detection mechanism 70 is shown, the present invention is not limited to this, and is arranged on the same side as the plurality of fuel injection valves with respect to the throttle bore in order to detect the rotation amount (accelerator opening) of the accelerator grip 4. As long as it is attached to the throttle body 10, an accelerator opening degree detection mechanism having another configuration can be employed.
In the above-described embodiment, the configuration in which the throttle body 10 is divided into the first body 10A and the second body 10B has been described. However, the present invention is not limited to this, and the configuration of the present invention is adopted in an integrated throttle body. It is also possible to do.

  As described above, the throttle device according to the present invention easily achieves a limited space in a multi-cylinder engine while achieving simplification of the structure, reduction in the number of parts, integration of parts, miniaturization of the apparatus, and the like. As a throttle device for a multi-cylinder engine mounted on a motorcycle or the like that has a particularly limited space, the accelerator cable that connects the accelerator grip and the accelerator opening detection mechanism can be easily routed. It is of course suitable for vehicles equipped with other engines.

DESCRIPTION OF SYMBOLS 1 Multi-cylinder engine 2 Connecting member 3 Intake system 4 Accelerator grip 5 Accelerator cable 5a Outer cable 5b Inner cable M Throttle device 10 Throttle body 10A First body 10B Second body 11 Throttle bore S Axis 11a, 11b Connecting portion 12 Bearing hole 13 Mounting part 14 Boss part 15 Case part 16 Cover part 17, 18, Connection part 19 Mounting part 20 Throttle valve 30 Throttle shaft L Axis 40 Drive mechanism 50 Fuel injection valve 51 Main body part 52 Connection part 53 Connector 60 Delivery pipe 70 Accelerator opening Detection mechanism 71 Holder 71a Flange portion 71b Bearing hole 71c Fitting hole 71d Cylindrical portion 71e Hooking portion 71f Flange portion 72 Sensor rotation axis L2 Axis 72a Large diameter portion 72b Reduced diameter portion 72b ′ Step 72c Fixing portion 72c ′ Washer 72c ′ Nut 73 Bearing 73a Inner ring 73b Outer ring 73c Rolling element 74 Sensor unit 75 Rotating member 75a Fitting hole 75b Drum part 75c Hook part 75d Abutting part 76 Spacer 77 Return spring 77a One end part 77b Other end part 78 Bracket 78a Fixing part 78b Stopper 79 Connector 80 Position sensor B1, B2, B3, B4, B5, B6 Screw

Claims (7)

A throttle body that defines a plurality of throttle bores, a plurality of throttle valves that respectively open and close the plurality of throttle bores, and a throttle shaft that is supported by the throttle body to integrally rotate the plurality of throttle valves; A drive mechanism for rotationally driving the throttle shaft; a plurality of fuel injection valves mounted on one side of the throttle body to inject fuel into the plurality of throttle bores; and an accelerator via an accelerator cable An accelerator opening detection mechanism mounted on the throttle body to detect the opening of the grip, and
The accelerator opening detection mechanism is disposed on the same side as one side where the plurality of fuel injection valves are arranged,
A throttle device characterized by that. The accelerator opening detection mechanism is disposed between the plurality of fuel injection valves in the arrangement direction of the throttle bore.
The throttle device according to claim 1. A delivery pipe disposed substantially parallel to the throttle shaft to supply fuel to the plurality of fuel injection valves;
The accelerator opening detection mechanism is disposed between two fuel injection valves of the plurality of fuel injection valves and in a region that does not protrude outward from the delivery pipe in the axial direction of the throttle bore.
The throttle device according to claim 2. The accelerator opening detection mechanism includes a rotation member that connects an accelerator cable that is interlocked with the rotation of an accelerator grip, a sensor rotation shaft that fixes the rotation member so as to rotate integrally, and a rotation of the sensor rotation shaft. A holder that is freely supported and is detachably fixed to the throttle body, and a sensor unit that is provided on the holder and detects a rotation angle of the sensor rotation shaft.
The throttle device according to any one of claims 1 to 3, wherein: The sensor rotation shaft is rotatably supported by the holder via a bearing including an inner ring and an outer ring,
The sensor rotation shaft has a reduced diameter portion that defines a step that makes the inner ring fit externally and abuts one end of the inner ring in the axial direction thereof.
The rotating member is fixed to the sensor rotation shaft with a spacer that is fitted on the reduced diameter portion and is in contact with the other end of the inner ring.
The throttle device according to claim 4. The accelerator opening detection mechanism includes a bracket for fixing an outer cable of an accelerator cable,
The bracket is detachably fixed to the holder to adjust the wiring direction of the accelerator cable.
The throttle device according to claim 4 or 5, wherein The plurality of fuel injection valves have a connector for electrical connection;
The accelerator opening detection mechanism has a connector for electrical connection,
The connector of the fuel injection valve and the connector of the accelerator opening detection mechanism are oriented so as to face substantially the same direction,
The throttle device according to any one of claims 1 to 6, wherein:

Images