JP6202530B2 - Engine intake air amount control device - Google Patents

Description

The present invention relates to an intake air amount control device for an engine, and in particular, a throttle body having an intake passage and a pair of bearing holes provided in the throttle body across the intake passage so as to cross the intake passage, and at one end a throttle lever a valve shaft integrally having, attached to the valve shaft, the throttle valve for opening and closing the intake passage by the rotation of the valve shaft, is connected between the front Symbol throttle lever and the throttle body, closing of the throttle valve the throttle lever A return spring provided with a closing biasing force for biasing in the direction and a thrust biasing force for biasing the throttle lever axially outward, and an axial movement of the valve shaft by the thrust biasing force of the return spring. A thrust stopper mounted on the valve shaft so as to abut against the outer surface of the throttle body opposite to the throttle lever, A movable stopper provided on the throttle lever, a fixed stopper formed integrally with the throttle body so as to face the movable stopper, and screwed to the fixed stopper, the movable stopper is used as a valve closing biasing force of the return spring. The present invention relates to an improvement of an eaves provided with an adjustment bolt that receives the resistance against the throttle and adjusts the idle opening of the throttle valve.

  Such an intake air amount control device for an engine is already known as disclosed in Patent Document 1.

JP 2007-64014 A

  When assembling such an intake air amount control device, first, the valve shaft is inserted into the bearing hole of the throttle body while connecting the return spring between the throttle body and the throttle lever, and in particular against the thrust biasing force of the return spring. After the valve shaft has been fully pushed into the bearing hole, a thrust stopper is attached to the valve shaft on the side opposite to the throttle lever to prevent the valve shaft from being removed from the bearing hole. The adjustment bolt is screwed into the mounting and fixing stopper to receive the movable stopper, and the position of the movable stopper, that is, the idle opening of the throttle valve is adjusted by adjusting the advance and retreat of the adjustment bolt.

  By the way, conventionally, a thrust stopper is prepared with the other hand while the operator holds the valve shaft fully pushed into the bearing hole against the thrust urging force of the return spring with the other hand. Since it was mounted on the shaft, it was not only bad in assembling, but also burdened the workers.

  The present invention has been made in view of such circumstances. The temporary fixing step for temporarily holding the state where the valve shaft is inserted into the bearing hole and the step for mounting the thrust stopper on the valve shaft are performed separately. An object of the present invention is to provide an intake air amount control device for an engine having good assemblability.

In order to achieve the above object, the present invention has a throttle body having an intake passage and a pair of bearing holes provided in the throttle body across the intake passage so as to cross the intake passage, and a throttle lever is integrated at one end. a valve shaft having a mounted on the valve shaft, the throttle valve for opening and closing the intake passage by the rotation of the valve shaft, is connected between the front Symbol throttle lever and the throttle body, the throttle lever in the closing direction of the throttle valve A return spring to which a valve closing biasing force to be biased and a thrust biasing force to bias the throttle lever axially outward, and axial movement of the valve shaft by the thrust biasing force of the return spring are regulated. Therefore, a thrust stopper attached to the valve shaft so as to contact the outer surface of the throttle body opposite to the throttle lever, and the throttle A movable stopper provided on the bar, a fixed stopper formed integrally with the throttle body so as to oppose the movable stopper, and screwed to the fixed stopper, the movable stopper resists the valve closing biasing force of the return spring. And an adjusting bolt for adjusting the idle opening of the throttle valve. In the intake air amount control device for an engine, the return spring is connected between the throttle body and the throttle lever. However, when the valve shaft is inserted into the bearing hole, a temporary fixing mechanism is provided that receives the valve closing biasing force and the thrust biasing force of the return spring and prevents the valve shaft from being detached by the thrust biasing force. This is the first feature.

  According to the present invention, in addition to the first feature, the temporary fixing mechanism includes the movable stopper, the fixed stopper that receives the valve closing biasing force of the return spring via the movable stopper, and the fixed stopper. A second feature is that it is formed of a restriction projection that is formed and abuts against the axially outer end surface of the movable stopper to prevent the valve shaft from being detached.

  According to the first feature of the present invention, by adopting a temporary fixing mechanism that holds the valve shaft in a state of being inserted into the bearing hole, the valve shaft is inserted, temporarily fixed, and the thrust stopper when the intake air amount control device is assembled. This can be divided into a mounting process, which improves work efficiency and shortens the assembly time cycle.

  According to the second feature of the present invention, the movable stopper and the fixed stopper can be used as they are in the temporary fixing mechanism, the structure can be simplified, and an increase in cost can be suppressed.

1 is a longitudinal sectional side view of an intake air amount control device for an engine according to an embodiment of the present invention. FIG. 3 is a partially longitudinal side view of the intake air amount control device. FIG. The assembly process explanatory drawing of the said intake amount control apparatus.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 3, an intake air amount control device D of the present invention is mainly used for a motorcycle engine, and includes a throttle body 1 attached to the engine. The throttle body 1 has an intake passage 2 in the center, and the intake passage 2 communicates with an intake port (not shown) of the engine via an intake pipe I connected to the downstream end of the throttle body 1.

  First and second bearing bosses 3, 4 projecting outward are formed on the left and right side walls of the throttle body 1 facing each other across the intake passage 2, and are coaxial with the bearing bosses 3, 4. The valve shaft 7 traversing the intake passage 2 is rotatably supported by the horizontal bearing holes 5 and 6 arranged side by side. Seal members 8 and 9 are respectively interposed between the first and second bearing bosses 3 and 4 and the valve shaft 7.

  A drum-type throttle lever 12 is integrally connected to one end of the valve shaft 7 in advance, and the valve shaft 7 and the throttle lever 12 are a single component. A butterfly throttle valve 10 that opens and closes the intake passage 2 according to the rotation of the valve shaft 7 is fixed to the valve shaft 7 with screws 11. The throttle valve 10 is opened and closed by rotating the throttle lever 12 via an operation wire 13 by a throttle grip (not shown) operated by a motorcycle operator.

  A return spring 15 surrounding the first bearing boss 3 is connected between the throttle body 1 and the throttle lever 12. The return spring 15 is a torsion coil spring having one end locked to the first locking portion 16 of the throttle body 1 and the other end locked to the second locking portion 17 of the throttle lever 12. The return spring 15 is provided with a valve closing biasing force that biases the throttle lever 12 in the closing direction of the throttle valve 10 and a thrust biasing force that biases the throttle lever 12 outward in the axial direction.

  In order to hold the valve shaft 7 in a predetermined axial position against the thrust biasing force, a thrust stopper 18 that comes into contact with the outer end surface of the second bearing boss 4 is mounted in the locking groove 19 on the outer periphery of the valve shaft 7. . For this thrust stopper 18, for example, a circlip is used.

  Between the throttle body 1 and the throttle lever 12, an idle adjusting device 20 for adjusting the idle opening of the throttle valve 10 is provided. The idle adjusting device 20 is integrated with the reverse T-shaped movable stopper 21 bent from the outer periphery of the throttle lever 12 toward the first bearing boss 3 and the side surface of the throttle body 1 on the first bearing boss 3 side. A fixed stopper 22 that is erected and faces the tip of the movable stopper 21, and an adjustment bolt that is screwed into the screw hole 24 of the fixed stopper 22 and receives the movable stopper 21 against the valve closing biasing force of the return spring 15. 25. A lock nut 26 is screwed onto the adjustment bolt 25.

  A control block 27 is joined to the second bearing boss 4. The control block 27 is connected to the other end of the valve shaft 7 and detects the opening of the throttle valve 10, and is upstream of the throttle valve 10. An intake air temperature sensor 29 for detecting the intake air temperature in the side intake passage 2 is provided.

As shown in FIG. 4, a temporary fixing mechanism 32 is provided between the throttle body 1 and the throttle lever 12. The temporary fixing mechanism 32 connects the return spring 15 between the throttle body 1 and the throttle lever 12 while connecting the valve shaft. 7 is inserted into the bearing holes 5 and 6, the valve closing biasing force and the thrust biasing force of the return spring 15 are received to prevent the valve shaft 7 from being detached due to the thrust biasing force. Specifically, the temporary fixing mechanism 32 includes an inverted T-shape of the movable stopper 21, and the fixing stopper 22 for receiving the valve closing biasing force of the spring 15 back through the movable stopper 21, this solid It is formed of a regulation protrusion 33 that is formed on the constant stopper 22 and prevents the valve shaft 7 from being detached by contacting the axially outer end surface of the distal end portion of the movable stopper 21.

  Next, the operation of this embodiment will be described.

In assembling the intake air amount control device D, the following steps are sequentially performed.
[Insertion of valve shaft 7, temporary fixing process]
First, while connecting the return spring 15 between the throttle body 1 and the throttle lever 12, the valve shaft 7 is inserted into the bearing holes 5 and 6 of the throttle body, and the throttle lever 12 is resisted against the thrust biasing force of the return spring 15, The throttle lever 12 is sufficiently pushed down so that the lower end portion of the inverted T-shaped movable stopper 21 goes below the restriction projection 33 of the fixed stopper 22. At that time, the adjusting bolt 25 is not yet screwed into the fixing stopper 22. Of course, when the valve shaft 7 is inserted into the bearing holes 5 and 6, a position where the movable stopper 21 does not interfere with the fixed stopper 22 is selected.

After sufficiently pushing down the throttle lever 12, the front end of the movable stopper 21 is brought into contact with the side surface of the fixed stopper 22 below the restricting projection 33 while utilizing the valve closing biasing force of the return spring 15. Then, the push-down force of the throttle lever 12 is released. Then, the throttle lever 12 is pushed up together with the valve shaft 7 by the thrust urging force of the return spring 15. However, as shown in FIG. Thus, the upward movement of the throttle lever 12 is immediately stopped, the separation of the valve shaft 7 from the bearing holes 5 and 6 due to the thrust biasing force of the return spring 15 can be prevented, and the valve shaft 7 is temporarily stopped. Therefore, the throttle body 1 with the valve shaft 7 can be moved to the next step without the operator continuing to push the throttle lever 12.
[Installation process of thrust stopper 18]
In this step, the thrust stopper 18 is prepared, and the throttle lever 12 is pushed down again to expose the locking groove 19 on the valve shaft 7 outside the outer end surface of the second bearing boss 4. A thrust stopper 18 is attached to the. Therefore, when the push-down force of the throttle lever 12 is released, the thrust stopper 18 comes into contact with the outer end surface of the second bearing boss 4, thereby preventing the axial movement of the valve shaft 7 due to the thrust biasing force of the return spring 15. An axial position is determined. At this time, the upper surface of the distal end portion of the movable stopper 21 is in a state of being spaced downward from the restricting protrusion 33 of the fixed stopper 22 (see FIG. 2).
[Throttle valve installation process]
Next, in the intake passage 2 of the throttle body 1, the throttle valve 10 is fixed to a predetermined mounting surface formed in advance on the valve shaft 7 with screws 11.
[Idle opening adjustment process]
Next, the adjusting bolt 25 is screwed into the screw hole 24 of the fixed stopper 22 so that the tip of the adjusting bolt 25 protrudes from the side surface of the fixed stopper 22 to receive the movable stopper 21 against the closing force of the return spring 15. Then, the tip of the adjustment bolt 25 is moved forward and backward to move the movable stopper 21 forward and backward, and the idle opening of the throttle valve 10 is adjusted.

  At this time, since the upper surface of the distal end portion of the movable stopper 21 is spaced downward from the restriction projection 33, even when the distal end portion of the movable stopper 21 comes directly below the restriction projection 33 during adjustment of the idle opening degree, the restriction projection 33. Can be adjusted without any interference. After the adjustment, the adjustment bolt 25 is fixed to the fixing stopper 22 by the lock nut 26.

In the [insertion and temporary fixing step of the valve shaft 7], the locking groove 19 of the valve shaft 7 may be exposed to the outside of the outer end surface of the second bearing boss 4 when the valve shaft 7 is temporarily fixed. it can. In this case, the thrust stopper 18 can be mounted in the locking groove 19 without depressing the throttle lever 12 again in the [thrust stopper 18 mounting step], but the [idle opening adjusting step] is performed in the movable stopper 21. It is necessary to set the mounting surface of the throttle valve 10 on the valve shaft 7 so that the front end portion of the valve and the restriction projection 33 do not interfere with each other.
[Control block installation process]
Finally, the control block 27 equipped with the throttle sensor 28 for detecting the opening of the throttle valve 10 and the intake air temperature sensor 29 is attached to the second bearing boss 4, and the assembly of the intake air amount control device D is completed.

  As described above, according to the present invention, when the intake air amount control device D is assembled, it can be divided into [insertion of valve shaft 7 and temporary fixing process] and [mounting process of thrust stopper 18]. Efficiency can be improved and the assembly time cycle can be shortened.

  In addition, the temporary fixing mechanism 32 that holds the valve shaft 7 in the state of being inserted into the bearing holes 5 and 6 is formed on the movable stopper 21 and the fixed stopper 22, and comes into contact with the outer end surface in the axial direction of the movable stopper 21. Since the control projection 33 is configured to prevent the valve shaft 7 from being detached, the movable stopper 21 and the fixed stopper 22 can be used as they are for the temporary fixing mechanism 32, the structure can be simplified, and the cost can be reduced. Can suppress the rise.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to it, A various design change is possible in the range which does not deviate from the summary.

D ... Intake amount control device 1 ... Throttle body 2 ... Intake passage 5, 6 ... Bearing hole 7 ... Valve shaft 10 ... Throttle valve 12 ..... throttle lever 15 ... return spring 18 ... thrust stopper 21 ... movable stopper 22 ... fixed stopper 25 ... adjusting bolt 28 ... throttle sensor 32 ... ... Temporary fixing mechanism 33 ... Regulating protrusion

Claims (2)

A throttle body (1) having an intake passage (2) and a pair of bearing holes (5, 6) provided in the throttle body (1) across the intake passage (2) and crossing the intake passage (2) And a valve shaft (7) integrally having a throttle lever (12) at one end, and a throttle valve (10) attached to the valve shaft (7) and opening and closing the intake passage (2) by rotation of the valve shaft (7). a) pre-SL is connected between the throttle lever (12) and the throttle body (1), wherein the closing biasing force for biasing the closing direction of the throttle valve of the throttle lever (12) (10), and the throttle lever ( 12) A return spring (15) to which a thrust urging force is urged outward in the axial direction is applied, and the axial movement of the valve shaft (7) by the thrust urging force of the return spring (15) is restricted. Therefore, the throttle lever 12) a thrust stopper (18) mounted on the valve shaft (7) so as to contact the outer surface of the throttle body (1) opposite to the throttle body (1), and a movable stopper (21) provided on the throttle lever (12). A fixed stopper (22) formed integrally with the throttle body (1) so as to face the movable stopper (21), and screwed to the fixed stopper (22), and the movable stopper (21) is In an intake air amount control device for an engine, comprising an adjustment bolt (25) for receiving the valve closing biasing force of a return spring (15) and adjusting an idle opening of the throttle valve (10).
The valve shaft (7) is connected to the bearing hole (5) while the return spring (15) is connected between the throttle body (1) and the throttle lever (12) between the throttle lever (12) and the throttle body (1). 6), a temporary fixing mechanism (32) for receiving the valve closing biasing force and the thrust biasing force of the return spring (15) and preventing the valve shaft (7) from being detached by the thrust biasing force when inserted into the return spring (15). An intake air amount control device for an engine characterized by comprising: The intake air amount control apparatus for an engine according to claim 1,
The temporary fixing mechanism (32) includes the movable stopper (21), the fixed stopper (22) that receives the valve closing biasing force of the return spring (15) via the movable stopper (21), and the fixed stopper. A restriction projection (33) that is formed on the stopper (22) and prevents the valve shaft (7) from detaching by coming into contact with the axially outer end surface of the movable stopper (21). Engine intake air amount control device.

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