JP4168974B2 - Throttle control device for motorcycle - Google Patents

Description

  The present invention relates to a throttle body for controlling air supplied to an engine in a fuel injection device, and more particularly to a throttle control device mounted for a motorcycle.

A conventional throttle body will be described with reference to FIG.
FIG. 2 is a longitudinal sectional view of the throttle body.
Reference numeral 10 denotes a throttle body having an intake passage 11 penetrating therethrough laterally. Both ends of the throttle valve shaft 12 crossing the intake passage 11 are rotatably supported by the throttle body 10.
In addition, a throttle valve 13 for opening and closing the intake passage 11 is disposed in the intake passage 11, and the throttle valve 13 is attached to the throttle valve shaft 12, and the throttle valve 13 is adjusted according to the rotation of the throttle valve shaft 12. The intake passage 11 is opened and closed.
The other end 12a of the throttle valve shaft 12 projects rightward from the other outer wall 10a (right side in FIG. 2) of the throttle body 10, and a drive lever 14 is integrally attached to the other end 12a. The
Reference numeral 15 denotes a rotating shaft standing on the other outer wall 10a of the throttle body 10, and a throttle lever 16 is screwed to the rotating shaft 15 with a nut.
The throttle lever 16 is engaged with a valve opening accelerator wire and a valve closing accelerator wire (not shown), and the other end of the accelerator wire is connected to an accelerator grip. Here, when the accelerator grip is rotated by the driver, this rotation is transmitted to the throttle lever via the accelerator wire, and the throttle lever 16 is rotated according to the rotation of the accelerator grip.
A link lever 17 connects the throttle lever 16 and the drive lever 14, and the rotation of the throttle lever 16 is transmitted to the drive lever 14 via the link lever 17. The throttle lever 16 and the drive lever 14 are thus connected via the link lever 17 in order to make the rotation of the accelerator grip and the opening characteristic of the throttle valve 13 non-linear.
Thus, the throttle lever mechanism T formed by the throttle lever 16, the link lever 17, and the drive lever 14 is attached to the other end 12a of the throttle valve shaft 12.
Also, other side wall 10a of the throttle body 10, the lever housing wall portion 10b which surrounds the outer periphery of the throttle lever mechanism T including the other end 12a of the throttle valve shaft are integrally formed, the right side of the lever housing wall 10b The opening 10 c is closed by the cover 18.
The throttle lever mechanism T is disposed in the storage space formed by the lever storage wall portion 10b and the cover 18 as described above when the throttle body 10 is mounted on a motorcycle that is directly exposed to the outside air. To protect from external obstacles or from mud splashes.
Reference numeral 19 denotes an opening sensor that is engaged with and arranged at one end 12b of the throttle valve shaft 12 protruding from the outer wall 10d on one side of the throttle body 10, and an output signal of the opening sensor 19 is sent to an ECU (not shown). Input and used for various controls.

According to such a conventional throttle control device, the throttle lever mechanism T including the throttle lever 16, the link lever 17, and the drive lever 14 is attached toward the other outer wall 10a of the throttle body 10, and further, the lever storage wall. The cover 18 is attached to the opening 10c of the portion 10b .
On the other hand, the opening degree sensor 19 is attached toward one end 12b of the throttle valve shaft 12 of the outer wall 10d on one side of the throttle body 10.
According to the above, the assembling work is performed from opposite directions different from each other, and the efficiency of the assembling work cannot be improved.
Further, when the maintenance work of the throttle lever mechanism T and the opening degree sensor 19 is performed in a state where the throttle body is mounted on the two-wheeled vehicle, the work is performed from different directions, and the maintenance workability is inferior.
Further, since the drive lever 14 is attached to the other end 12 a of the throttle valve shaft 12, the other end 12 a of the throttle valve shaft 12 has a flattening portion for suppressing the rotation of the drive lever 14 relative to the throttle valve shaft 12. 12c is formed, and a flattening groove of the opening degree sensor 19 is locked to one end 12b of the throttle valve shaft 12 , and therefore a flattened portion 12d is formed at one end 12b of the throttle valve shaft 12.
In this way, by machining and forming the flattened portions 12c and 12d at both ends of the throttle valve shaft 12 made of a round material , it is necessary to reverse the flattened portions 12c and 12d when machining the throttle valve shaft 12. Therefore, it is difficult to reduce the manufacturing cost of the throttle valve shaft 12.
Furthermore, the lead wire of the opening sensor 19 is on the one side outer wall 10d side of the throttle body 10, and the accelerator wire is on the other side outer wall 10a side of the throttle body 10.
In this way, the lead wire and the accelerator wire are disposed on both sides across the intake passage 11 of the throttle body 10 in the case where the throttle body is disposed in a narrow space below the seat as in a two-wheeled vehicle. The work is difficult.

  The throttle control device for a motorcycle according to the present invention is made in view of the above problems, and improves the throttle body assembly workability and improves the workability of the throttle valve shaft, thereby reducing the manufacturing cost of the throttle body. An object of the present invention is to provide a throttle body that is suitable for use in a two-wheeled vehicle by reducing and improving the connectivity of lead wires and accelerator wires of an opening sensor.

In order to achieve the above object, the throttle control device for a motorcycle according to the present invention has an intake passage that passes through the inside of the throttle body and that is rotatably supported by the throttle body across the intake passage. In the throttle body with the throttle valve attached to open and close the passage,
A lever housing wall portion that opens outwardly with an outer opening is formed integrally with one side outer wall of the throttle body, and the outer opening is closed by a cover to form a lever housing chamber.
A drive lever fixedly disposed at one end of the throttle valve shaft;
A throttle lever fixed to a rotary shaft disposed away from the throttle valve shaft and locked to an accelerator wire operated by a driver;
A throttle lever mechanism constituted by a link lever for connecting the drive lever and the throttle lever is housed and disposed in the lever housing chamber;
Further, the opening sensor is attached to the cover so as to be locked to one end of the throttle valve shaft and detect the rotation angle of the throttle valve shaft.

According to the throttle control device of the present invention, the assembly of the throttle lever mechanism, the cover, and the opening sensor are all performed in one direction with respect to the throttle body, so that the assembly workability can be improved.
Further, since the processing of the flattening portion with respect to the throttle valve shaft only needs to be performed at one end of the throttle valve shaft, the workability of the throttle valve shaft can be improved, and the manufacturing cost of the throttle body can be effectively reduced.
In addition, the lead wire of the opening sensor and the accelerator wire connected to the throttle lever mechanism are arranged on one side of the throttle body, so the connectivity of the lead wire and the accelerator wire after the throttle body is mounted on a motorcycle can be improved. In addition, the maintenance workability can be improved.
In addition, the throttle lever mechanism, cover, and opening sensor are concentrated on the outer wall on one side of the throttle body, and the outer wall on the other side of the throttle body can be neatly organized. It is.
Furthermore, the opening degree sensor is attached to the throttle body via a cover. According to this, when the throttle body is heated by heat conduction from the engine or by the vaporization of fuel injected into the intake passage. When cooled, these heats are not easily transmitted directly to the opening sensor, which is preferable for maintaining the output characteristics of the opening sensor.

An embodiment of a throttle body for a motorcycle according to the present invention will be described below with reference to FIG.
In addition, the same code | symbol is used about the same structure part as FIG.
The other end 12a of the throttle valve shaft 12 is rotatably supported on the other outer wall 10a of the throttle body 10, and one end 12b protrudes leftward from the one outer wall 10b of the throttle body 10 and is rotatably supported. A flat portion 12d is formed on 12b.
Further, a drive lever 14 is screwed and fixed to one end 12b of the throttle valve shaft by a nut 1, and this drive lever 14 is connected to a throttle lever 16 constituting a throttle lever mechanism T via a link lever 17. The
The throttle lever mechanism T is disposed so as to face one side outer wall 10b of the throttle body 10.

Further, a lever housing wall 10e surrounding the throttle lever mechanism is integrally formed on one side outer wall 10b of the throttle body 10, and an outer opening 10f of the lever housing wall 10e opens toward the left. To do.
Reference numeral 2 denotes a cover that closes the outer opening 10f of the lever housing wall 10e. The cover 2 has a hole 2a through which a flattening portion 12d formed at one end 12b of the throttle valve shaft 12 is rotatably inserted. And then drilled.

Next, assembly of the throttle control device will be described.
The throttle valve shaft 12 traverses the intake passage 11 and is rotatably supported by the throttle body 10. The other end 12a of the throttle valve shaft 12 is rotatably supported by the throttle body 10a, and one end 12b is It is rotatably supported by the side outer wall 10b and is arranged to protrude further leftward than the one side outer wall 10b.
A drive lever 14 is screwed and fixed to one end 12 b of the throttle valve shaft by a nut 1, and this drive lever 14 is connected to a throttle lever 16 attached to a rotary shaft 15 via a link lever 17. .
According to the above, the throttle lever mechanism T including the drive lever 14, the link lever 17, and the throttle lever 16 is disposed on the one side outer wall 10b of the throttle body 10, and the throttle lever mechanism T is disposed inward of the lever housing wall portion 10e. Be placed.
Next, the cover 2 is attached toward the outer opening 10f of the lever housing wall 10e, and the outer opening 10f is closed. At this time, the flattened portion 12d of the one end 12b of the throttle valve shaft 12 is a cover. The second hole 2a is disposed so as to protrude rightward.
Next, the opening sensor 19 is screwed and fixed on the cover 2 with screws 3, and at this time, the flattening groove 19 a of the opening sensor 19 is engaged with the flattening portion 12 d of the throttle valve shaft 12. .

According to the above, the throttle valve shaft 12 is rotatably supported on the throttle body 10, the drive lever 14 is screwed to one end 12b of the throttle valve shaft 12, and the lever housing wall 10e and the cover for covering it 2, a lever storage chamber A is formed , and a throttle lever mechanism T including a drive lever 14, a link lever 17, and a throttle lever 16 is stored and disposed in the lever storage chamber A.
Further, an opening sensor 19 is screwed on the cover 2, and a flattening groove 19 a of the opening sensor 19 is engaged with a flattening portion 12 d of the throttle valve shaft 12.

  Accordingly, when an accelerator grip (not shown) is rotated by the driver and the throttle lever 16 is rotated by the accelerator wire, the rotation of the throttle lever 16 is transmitted to the drive lever 14 via the link lever 17, thereby the throttle valve. The shaft 12 rotates, and the throttle valve 13 controls the opening and closing of the intake passage 11 according to the rotation operation of the accelerator grip.

According to the throttle control device of the present invention as described above, the assembly direction of the throttle lever mechanism T composed of the drive lever 14, the link lever 17, and the throttle lever 16, the assembly direction of the cover 2, the assembly direction of the opening sensor 19, Are all performed on one side of the throttle body 10 (left side in FIG. 1), so that the assembly workability can be greatly improved.
Further, the chamfered portion formed on the throttle valve shaft 12 is only required to form a chamfered portion 12d at one end 12b, so that the workability of the throttle valve shaft 12 can be improved. Can be reduced.
Further, the throttle lever mechanism T, the cover 2 and the opening degree sensor 19 are intensively arranged on one side outer wall 10b of the throttle body 10, and the other side outer wall 10a of the throttle body 10 can be neatly assembled. In the case where the throttle body 10 is arranged so as to be directly exposed to the outside air like a two-wheeled vehicle, the appearance can be simply summarized, and the degree of freedom in the design of the two-wheeled vehicle can be improved.
Further, according to the fact that the accelerator wire for connecting the throttle lever 16 and the accelerator grip and the lead wire extending from the opening sensor 19 can be arranged together on one side of the throttle body 10, the throttle is placed in a narrow space below the seat of the motorcycle. In the state where the body 10 is mounted, the connection workability of the wire and the lead wire can be greatly improved.
Further, the opening sensor 19 is attached to the throttle body 10 via the cover 2. Especially when the cover 2 is formed of a synthetic resin material, the heat conduction between the throttle body 10 and the opening sensor 19 is effective. Therefore, the characteristics of the opening sensor can be stably maintained without being influenced by the temperature change of the throttle body.

The principal part longitudinal cross-sectional view which shows one Example of the throttle control apparatus which becomes this invention. The principal part longitudinal cross-sectional view which shows the conventional throttle control apparatus.

Explanation of symbols

2 Cover 10 Throttle body 10b One outer wall 10e Lever storage wall 10f Outer opening 12 Throttle valve shaft 12b One end 19 Opening sensor T Throttle lever mechanism

Claims (1)

In a throttle body in which an intake passage penetrates the inside of the throttle body and a throttle valve that opens and closes the intake passage is attached to a throttle valve shaft that is rotatably supported by the throttle body across the intake passage.
A lever housing wall (10e) that opens outwardly with an outer opening (10f) is formed integrally with one side outer wall (10b) of the throttle body (10), and the outer opening (10f) is formed by a cover (2). The lever storage chamber (A) is formed by being closed,
A drive lever (14) secured to one end (12b) of the throttle valve shaft (12);
A throttle lever (16) fixed to a rotary shaft (15) disposed away from the throttle valve shaft (12) and locked to an accelerator wire operated by a driver;
A throttle lever mechanism (T) constituted by a link lever (17) for connecting the drive lever (14) and the throttle lever (16) is accommodated in the lever accommodating chamber;
The two-wheeled vehicle according to claim 1, further comprising an opening sensor (19) attached to one end (12b) of the throttle valve shaft (12) and detecting the rotation angle of the throttle valve shaft (12). Throttle control device.

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