ES2702399T3 - Structure of the intake system of the power unit - Google Patents

Abstract

An intake system structure of a power unit (5), which is mounted on a vehicle (1), and in which an internal combustion engine (2) and a power transmission (3) are integrated with each other, An air filter (50) is disposed in a position remote from a part of the cylinder (44) of the internal combustion engine (2), an accelerator body (52) is placed in a position near the part of the cylinder (44). ) and the air filter (50) and the throttle body (52) are connected to each other by a connecting pipe (51), a regulating member (54), to regulate the throttle body (52) to rotate around the the axis of an intake passage (52a) thereof, regulates the throttle body (52) in a position in the direction of rotation about the axis with respect to the part of the cylinder (44), the throttle body (52) being assembled to the part of the cylinder (44) through an inlet manifold (53) and fully supported by the part of the cylinder (44); and in the throttle body (52), a cylindrical connecting part (60) to the connecting tube (51) is provided with a positioning part (61) to position the connecting tube (51) in the direction of rotation, an end downstream of the connecting tube (51) is provided with a side of the tube connecting the cylindrical part (56) for connection to the throttle body (52), characterized in that the side of the tube connecting the cylindrical part ( 56) is provided with a coupling part (58) composed of two projections projecting towards the side of the accelerator body (52), the engaging part (58) composed of the two projections holds the positioning part (61) between them to engage with them, thereby performing the positioning in the direction of rotation about the axis of the tube side connecting the cylindrical part (56), and the positioning part (61) is a projecting part (61) for an idle air screw (62) provided swim in the throttle body (52).

Description

DESCRIPTION

Structure of the intake system of the power unit

Technical field

The invention relates to an intake system structure of a power unit provided with an internal combustion engine, which is mounted on a vehicle, particularly on the small vehicle.

Background of the technique

In an intake system of a power unit, which is mounted on a vehicle, particularly on a small vehicle and is constructed so that an internal combustion engine and a power transmission are integrated together at the rear, as shown in the following patent literature 1, an accelerator body is provided between the internal combustion engine and an air filter, and is connected to the air filter via a connecting tube. In the end part of the downstream side of the connecting tube, the inlet part of the upstream side of the throttle body is adjusted, and the periphery thereof is clamped by a clamping band to be fixed and supported.

Patent Literature

[Patent Literature 1] JP-A No. 2006-291777 (Figure 2, Figure 3)

[Patent Literature 2] US6006712 A

[Patent Literature 3] US5341773 A

Summary of the invention

Technical problem

However, as shown in patent literature 1 above, the power unit is configured so that the air filter is provided in a position remote from the cylinder part of the internal combustion engine and the throttle body is positioned in a position near the part of the cylinder, resulting in the disadvantage that since the connecting tube is generally a comparatively long member, the position of rotation around a tube axis in the clamping portion may vary in the adjustment. When a fixation is made with a variation in the alignment in the direction of rotation, there is a risk that the distortion of the shape or the like is caused by the torsional tension.

To perform such alignment accurately, a complicated structure and problematic connection work is needed. Patent literature 2 and 3 also show the background of the related art.

The invention has been made to address the above problem in an intake system of a power unit mounted on a vehicle at the rear and provides an intake system structure of a power unit, which can improve the function of the power system. Admission and connection capacity in a simple constitution while holding down the space.

Solution to the problem

In order to achieve the above objective, the invention described in claim 1 provides a structure of intake system of a power unit, which is mounted on a vehicle and is constructed in such a way that an internal combustion engine and a transmission of power are integrated together, an air filter is provided in a position remote from a part of the cylinder of the internal combustion engine, an accelerator body is placed in a position near the cylinder part and the air filter and the body of the accelerator are connected together by a connecting tube, wherein a regulating member about the axis of an intake passage regulates the throttle body at a position in the direction of rotation about the anterior axis with respect to the part of the cylinder , assembling the throttle body to the cylinder part through an intake manifold and supporting it integrally, and in the throttle body, a part Cylindrical connection to the connection tube is provided with a positioning part to position the connection tube in the direction of rotation.

The invention described in claim 2 provides an intake system structure of a power unit according to claim 1, wherein the positioning part is placed in a position to engage with a hooking part provided on the side of the tube that connects the cylindrical part of the connection tube to the throttle body.

The invention described in claim 3 provides a structure of intake system of a power unit according to claim 2, wherein the positioning part is a protruding part for an idle air screw provided in the throttle body.

The invention described in claim 4 provides an intake system structure of a power unit according to claim 3, wherein the positioning part is provided offset to one side with respect to the axis of the intake passage, as seen in FIG. the vertical direction.

The invention described in claim 5 provides an intake system structure of a power unit according to claim 3 or 4, wherein in the throttle body, the cylindrical connecting part to the connecting tube is off-centered to one side with With respect to the axis of the intake passage, the side of the tube connecting the cylindrical part of the connection tube is offset in a manner similar to the side of the throttle body with respect to the axis of the intake passage on the side of the tube in the connection tube.

The invention described in claim 6 provides an intake system structure of a power unit according to claim 5, wherein the connecting tube includes a linear part for a predetermined distance on the upstream side of the connecting tube side. the cylindrical part.

The invention described in claim 7 provides an intake system structure of a power unit according to claim 6, wherein a cable guide part projects onto the outer surface of the linear part on the side where the side of the The tube connecting the cylindrical part is off center with respect to the axis of the intake passage on the side of the tube, and the cable guide part includes a recessed part where a cable is hooked.

The invention described in claim 8 provides an intake system structure of a power unit according to claim 7, wherein the cable is an accelerator cable, which is bent backwards as a U-shape from an accelerator drum adjusted at the end of the right or left shaft of an accelerator valve shaft provided in the throttle body oriented in the width direction of the vehicle, which penetrates the outside of the throttle body in the connecting tube and is placed in the front of the vehicle.

The invention described in claim 9 provides an intake system structure of a power unit according to one of claims 3 to 8, wherein a storage box of the vehicle is placed on the throttle body and the connecting tube, and a sight glass of the idle air screw is provided in the lower part of the storage box.

Advantageous effects of the invention

In the intake system structure of the power unit according to the invention of claim 1, the positioning part in the direction of rotation of the connecting tube is provided in the cylindrical connecting part of the throttle body positioned in the direction of rotation with respect to the cylinder part of the internal combustion engine, so that precise connection is easily achieved, so that variation in positioning in the direction of rotation of the tube and distortion of tube shape can be reduced connection due to variation.

As a result, it is possible to obtain the intake unit structure of the power unit, which can improve the function of the intake system and the connection capacity in a simple constitution while restricting the space for the intake system of the unit of power.

According to the invention of claim 2, the connection tube can be positioned in the direction of rotation simultaneously with the connection of the connecting tube to the throttle valve, so that the working capacity is improved in addition to the effect of the invention of the claim 1

According to the invention of claim 3, the protruding part for the idle air screw also serves as the positioning part, so that the accelerator body can be prevented from becoming larger and larger in addition to the effect of the invention of claim 2.

According to the invention of claim 4, the projection of the positioning part in the height direction can be reduced so that the accelerator body can be prevented from becoming larger and larger in addition to the effect of claim 3.

According to the invention of claim 5, the cylindrical connecting part of the throttle body is formed eccentric to the intake passage, so that even when the side of the tube connecting the cylindrical part of the connecting tube is formed eccentric to the intake passage On the side of the tube, the positioning in the direction of rotation of the connecting tube can eliminate the eccentricity of the axes of both intake passages, smooth the connection between the throttle body and the connecting tube, and also achieve performance stability in the internal combustion engine in addition to the effect of claim 3 or claim 4.

According to the invention of claim 6, the retention in the connection work can be improved by the linear part so that the working capacity can be improved and the change of position in the direction of rotation can be avoided, in addition to the effect of the invention of claim 5.

According to the invention of claim 7, the cable guide part is provided in the linear part of the connecting tube, so that the space for guiding the cable can be easily secured and the design performance of the cable in the vehicle can be further improve the effect of the invention of claim 6.

According to the invention of claim 8, the throttle cable is retained through the guide part of the cable in the connecting tube, so that the throttle cable can be placed lower and the seat height can be reduced, in addition to the effect of the invention of claim 7.

According to the invention of claim 9, even when the upper sides of the throttle body and connecting tube are covered with the large storage box, the idle air screw can be inspected without removing the storage box, so that the working capacity can be improved in addition to the effect of the invention of one of claims 3 to 8.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a general diagram for explaining a motorcycle in which a power unit is assembled according to an embodiment of the invention.

Figure 2 is a left side view of the main part composed mainly of a power unit and an intake system in its periphery according to the embodiment of the invention.

Figure 3 is a plan view of the main part composed mainly of a power unit and an intake system in its periphery according to the embodiment.

Figure 4 (a) is a plan view, with broken portions, showing an air filter box and a connecting tube in the present embodiment. (b) is a left side view, with broken portions, showing the air filter case and the connecting tube, in the direction of arrow Ivb in Figure 4 (a).

Figure 5 (a) is a front end view of the connection tube in the direction of arrow Va in Figure 4 (a), and (b) is a sectional view of the connection tube in the direction of the arrow Vb in Figure 4 (a).

Fig. 6 (a) is a right side view of an accelerator body according to the embodiment, and (b) is a rear view of the throttle body in the direction of arrow VIb in Fig. 6 (a). (a) is equivalent to a view in the direction of arrow VIa (b), and part Vic in (a) is a partial sectional view in the direction of arrow VIc in (b).

Figure 7 (a) is a right side view of the throttle body according to the embodiment, (b) is a front view of the throttle body in the direction of the arrow VIIb in Figure 7 (a). (a) is equivalent to a view in the direction of arrow VIIa, and part VIIc in figure 7 (b) is a partial sectional view in the direction of arrow VIIc in figure 7 (a).

Figure 8 (a) is a sectional elevation of the throttle body in the direction of arrow VIIIa in Figure 6, and (b) is a sectional elevation of the throttle body in the direction of arrow VIIIb in the figure 6

Figure 9 is a plane partially in section of the vicinity of a bypass valve in the start state of the accelerator body in the direction of arrow IX in Figure 6.

Figure 10 is a left side view of the main part composed mainly of a power unit and an intake system in its periphery according to a modified form of the embodiment.

Figure 11 is a plan view of the main part composed mainly of the power unit and the intake system in its periphery according to the only modified form of the embodiment.

Description of the realizations

An intake system structure of a power unit according to an embodiment of the invention will now be described with reference to Figure 1 to Figure 9. The directions as the front, the rear, the left, the right, the upper part and the lower part depend on the directions of a vehicle in the state where a power unit according to the embodiment is mounted on a vehicle, particularly on the small size vehicle, such as a motorcycle. In the drawings, the arrow F designates the front side of the vehicle, L the left side of the vehicle, R the right side of the vehicle and U the upper side of the vehicle, respectively.

In the drawings, an empty arrow designates the intake air flow to an internal combustion engine, a small arrow m designates the inactive air flow, and a small arrow n designates the bypass air flow, usually in the state Of start.

Figure 1 is a left side view of a motorcycle 1 as a vehicle according to the present embodiment. The motorcycle 1 includes a power unit below a seat 6, in which an internal combustion engine 2 and a power transmission 3 to a rear wheel are integrated with each other, and a power unit 5 is pivotally adjusted to the frame of the body 4, and the internal combustion engine 2 is a four stroke single cycle internal combustion engine. The power unit 5 is mounted on the motorcycle 1 with a crankshaft 8 of a power unit case 7 oriented in the width direction of the motorcycle 1.

As shown in Figure 1 to Figure 3, in the motorcycle 1 according to the present embodiment, a pair of right and left front forks 12 to which a front wheel 11 is rotated are pivoted in a head tube 10. located in the front end portion of the body frame of the vehicle 4 in a steerable manner through a steering rod 13. A steering handle 14 is mounted on the upper part of the steering rod 13.

The vehicle body frame 4 is an underbone type formed by extending a main frame 15 obliquely back to the underside from the head tube 10 and making a lower part between the head tube 10 and the seat 6 for an occupant , so that the ease of riding astride is improved. A footrest 16 on which the feet of a driver sitting on the seat 6 are placed is placed on the bottom.

The rear end part of the main frame 15 is attached to the lateral middle part of a transverse frame 17 which extends laterally in the longitudinal middle part of the lower part of the vehicle body. A pair of right and left pivoting plates 19 supporting the front of the power unit 5 to oscillate vertically through a suspension link 18 are attached to the right and left end portions of the cross frame 17.

In addition, the front end portions of a right rear frame pair 20R and left rear frame 20L are respectively attached to the right and left ends of the transverse frame 17.

The right and left rear frames 20L, 20R extend backwards obliquely upwards from the transverse frame 17, and are bent to tilt smoothly. Furthermore, in the middle of extending obliquely upwards, the right and left rear frames are connected and joined together by a transverse member 21 formed to be bent and projected towards the upper front part of the vehicle, and connected and joined together by an element of connection 22 oriented horizontally in the direction of the width of the vehicle at its rear ends.

The left rear frame 20L and the right rear frame 20R are constructed so that the left rear frame 20L is formed to move towards a lower side from the right rear frame 20R in the positions to be connected to the transverse member 21, and a part of left connection 23L of the left rear frame 20L to the transverse member 21 is positioned lower than a right connection part 23R of the right rear frame 20R to the transverse member 21.

The seat 6 having seating surfaces for a driver's seat and a rear seat in the front and rear are placed on the right and left rear frames 20L, 20R.

A storage box 24 is provided below the front of the seat 6 between the right and left rear frames 20L, 20R, and a fuel tank 25 is provided below the rear part of the seat 6.

In Figure 1, the reference number 26 is a front fender, 27 is a rear fender, 28 is a rear light, 29 is a main stand and 30 is a side stand.

The body frame of the vehicle 4 is covered with a body cover 31 composed mainly of synthetic resin, and in the front part of the body of the vehicle, a front light 32 is placed on the body cover 31.

The power unit 5 is formed by integrating the internal combustion engine in the front with a power transmission 3 to the left of the rear part, and a suspension part 40 is provided in the lower part of the front of the engine. power unit box 7.

In the suspension part 40, the power unit 5 is supported on a pivot plate 19 through a suspension link 18 to oscillate vertically, and also the left side of the rear of the power unit 5 is supported on the right and left rear frames 20L, 20R through a rear cushion 33 to approach and separate from each other.

A rear wheel 34 is positioned in the rear end portion of the power transmission 3 provided on the rear-end side of the power unit case 7.

As shown in Figure 2 and Figure 3, a cylinder block 41, a cylinder head 42 and a cylinder head cover 43 are clamped and stacked, sequentially, to lean forward substantially horizontally at the front of the housing of the power unit 7 to thereby constitute a cylinder part 44 of the internal combustion engine 2.

An exhaust pipe 45 is mounted extending from the cylinder head 42 downward and a little forward, and the exhaust pipe 45 extends rearwardly under the crankcase, is diverted to the right and connected to a muffler 46 placed in the right side of the vehicle body (see figure 1).

An air filter 50 is supported at a position remote from the cylinder part 44 of the internal combustion engine 2 on the power transmission 3 on the left side of the rear wheel 34, and an accelerator body 52 is disposed at a position near the part of the cylinder 44. The air filter 50 and the throttle body 52 are connected to each other by a connecting tube 51.

The throttle body 52 is located above the power unit 5 and just above the suspension part 40 provided in the lower part of the power unit 5 for holding the power unit 5 in the frame of the vehicle body 4 .

The downstream side of the throttle body 52 is fastened to the upstream side of an inlet manifold 53 by a bolt 54, and the downstream end of the inlet manifold 53 is mounted and fixed to the cylinder head 42 by a bolt. 55 to communicate with an intake port, not shown, that is provided in the cylinder head 42.

Therefore, the intake manifold 53 is regulated to rotate about the axis of an intake passage and is mounted on the cylinder part 44 by the bolt 55, and the throttle body 52 is regulated to rotate about the axis Y (see Figures 6, 7) of the intake passage 52a and is mounted on the intake manifold 53 by the bolt 54, so that the throttle body 52 is assembled to the cylinder part 44 through the intake manifold. 53 and is supported integrally with the position thereof in the direction of rotation about the axis Y regulated by the bolt 55 which serves as a regulating member about the axis Y of the intake passage 52a.

The air purified by the air filter 50 is fed to the cylinder head 42 of the internal combustion engine 2 through the respective intake passages of the connection pipe 51, the throttle body 52 and the intake manifold 53 .

The lower part of a fuel injector 35 for injecting fuel into an inlet port not shown is fitted to the top of the inlet manifold 53, and one end of a fuel pipe 37, the other end being connected to a fuel pump. fuel 36 of the fuel tank 25, connected to the fuel injector 35, and fuel is supplied from the fuel tank 25 to the cylinder head 42 by the fuel injector 35.

As shown in Figure 4, the air filter 50 is constructed by providing a filter element 50b in an air filter box 50a. The interior of the air filter box 50a is divided by the filter element 50b positioned as a plate with the faces pointing in the lateral direction, an input port 50c from the outside is provided on the side of the left surface of the element of filter 50b, and a clean side chamber 50d is provided on the side of the right surface. The connecting tube 51 is connected to the clean side chamber 50d, into which an inlet portion 51b of an inlet passage of the tube side 51a is inserted.

The connecting tube 51 is a cylinder made of rubber or resin, which is provided with a reinforcing rib 51c formed on the outer surface and has a cylindrical section, so that the connecting tube can cope with vibration, displacement and the heat between the connection devices.

On the side opposite to the inlet portion 51b of the upstream end inserted into the clean side chamber 50d, the downstream end of the connecting tube 51 is provided with a side of the tube connecting the cylindrical portion 56 for connection to the body of the accelerator 52 downstream.

The connecting tube 51 is provided with a linear part 51d extending for a predetermined distance on the upstream side of the side of the tube connecting the cylindrical part 56.

As shown in Fig. 5 (a), the T-axis on the side of the tube connecting the cylindrical part 56 is offset to one side (upwards, side U in the drawing) with respect to the S axis of the intake passage on the side of tube 51a in connection tube 51.

The side of the tube connecting the cylindrical part 56 is provided with a hook part 58 (see also figure 4) which includes two projections projecting towards the throttle body 52 in the directions of the axes S, T on the side eccentric with the S axis of the inlet passage on the side of the tube 51a.

As shown in Fig. 5 (b), the outer surface of the linear part 51d is provided with a cable guide part 57 projecting on the off-side side of the tube connecting the cylindrical part 56 with the axis S of the passage inlet side of the tube 51a, and the guide portion of the cable 57 includes a recessed portion 57a (see also Figure 4) where the cable is hooked. Like the cable to be hooked, when an accelerator cable 66 is hooked as mentioned below, it is especially effective, but even when the other various cables (including pipes) are used for power, electricity and fluids, the cable it can be placed further down in a space in the connecting tube 51, so that the space guiding the cable can be easily secured.

As shown in Figure 6, the throttle body 52 is provided with a cylindrical connection part 60 to the connection pipe 51, and the Z axis of the cylindrical connection part 60 is off-centered to one side (upwards, U-side). in the drawing) with the Y axis of the intake passage 52a in the throttle body 52.

The cylindrical connecting part 60 is provided with a positioning part 61 for positioning the connecting tube 51 in the direction of rotation around the T axis on the side of the tube connecting the cylindrical part.

The positioning part 45 is placed in a position to engage with a hook part 58 provided on the side of the connecting tube connecting the cylindrical part of the connecting tube 51 in the cylindrical connecting part 60 of the throttle body 52, and in the present embodiment, the positioning part of a projecting part 61 for an idle air screw 62 provided in the throttle body 52.

The positioning part 61 is, as shown in FIG. 6 (b), provided in a displaced position to one side (the left side, L side in the drawing) with the Y axis of the intake passage 52a of the throttle body 52, as seen in the vertical direction.

When the connecting tube 51 constructed, in this way, is connected to the throttle body 52, the tip of the connecting cylindrical part 60 of the throttle body 52 is inserted into the side of the tube connecting the cylindrical part 56, and the T axis of the tube side connecting the cylindrical portion 56 is aligned with the Z axis of the cylindrical connection part 60.

In addition, the two projections of the hook part 58 on the side of the tube connecting the cylindrical part 56 are engaged to hold the positioning part 61 of the cylindrical connecting part 60 between them, thereby positioning the side of the connecting pipe. the cylindrical part 56 in the direction of rotation about the axis T. As a result, the connecting tube 51 is positioned in the direction of rotation, so that the axis S of the intake passage on the side of the tube 51a is aligned with the axis And of the intake passage 52a in the throttle body 52, thereby communicating both intake passages 51a, 52a together as predetermined.

The outer periphery of the side of the tube connecting the cylindrical portion 56 where the tip of the connecting cylindrical portion 60 of the throttle body is inserted in the interior in a predetermined connection condition as described above, is held by a band of fixation (see figure 4).

As described above, the throttle body 52 is regulated at the position in the direction of rotation about the Y axis by the bolt 54 which serves as a regulating member to regulate rotation about the Y axis of the intake passage 52a, and assembled to the cylinder part 44 and supported integrally through the input manifold 53, so that the connecting tube 51 is regulated in the rotational position about the axis S with respect to the power unit 5 as well.

As shown in Figures 6 and 7, the intake passage 52a of the throttle body 52 is provided with a throttle valve 63 of the throttle type positioned to open and close the intake passage, and an accelerator valve shaft 64 that the throttle valve is supported rotatably on both the right and left side walls, which cross the intake passage 52a horizontally with the axis V oriented in the width direction of the vehicle.

In the throttle valve shaft 64, an accelerator drum 65 is secured to the end of the shaft projecting to the right of the accelerator body 52 (direction R in the drawing), an accelerator cable 66 and a return spring 67 for energizing the throttle valve 63 in the closing direction are connected to the throttle drum, and the throttle cable 66 is towed by an accelerator operating element not shown, thereby opening the throttle valve 63.

The throttle cable 66, as shown in Figures 2 and 3, is pulled back from the accelerator drum 65, engages the recessed portion 57a of the cable guide portion 57, is bent backward as a way of U, and placed on the front of the motorcycle 1.

The throttle cable 66 is penetrated and placed through the throttle cable tube.

A throttle opening sensor 68 formed separately from the throttle body 52 fits an outer wall of the throttle body 52 where the other end (the left end, the L-end direction in the drawing) of the thrust shaft projects. throttle valve 64.

The throttle opening sensor 68 which detects an accelerator opening is adjusted to the throttle body 52 with a sensing portion 68a thereof aligned with the V axis of the throttle valve shaft 64, and also fixes the throttle body 52 from the left side by means of a sensor fixing bolt 69.

A start air control valve 70 as an actuator that controls the throttle body 52 is mounted on the throttle body 52 above the throttle opening sensor 68 side by side. The start air control valve 70 is mounted on the throttle body 52 with two mounting bolts of the valve 71 juxtaposed near the accelerator opening sensor 68 from the same direction in the longitudinal direction of the vehicle.

The start air control valve 70 is constructed by a solenoid valve, and controls the combustion air (bypass air at the start) supplied by an opening of the throttle valve 63, bypassing the throttle valve 63 upon starting the internal combustion engine 2.

As shown in Figure 6 (b) and Figure 8, the combustion air passes from the upstream side of the throttle valve 63 of the throttle body 52, ie, a bypass air groove 72 formed and projected to the intake passage 52a of the connecting cylindrical part 60 through the bypass air inlet orifice 73 as indicated by a small arrow n to enter the start air control valve 70.

As shown in Fig. 9, the start-off bypass air controlled by the start-air control valve 70 is supplied from the throttle valve 63 to the intake passage 52a of the downstream side (the intake manifold side 53). ) as shown in Figure 7 (b) through a bypass air supply orifice 74 as indicated by the small arrow n.

The positioning part 61 engaged with the engaging part 58 on the side of the connecting tube 51 is a projecting part 61 to which the idle air screw 62 is screwed and adjusted.

An idle air adjusting valve 75 is provided which includes the idle air screw 62 for adjusting the amount of combustion air supply necessary (idle air), which is supplied even when the throttle valve 63 is closed in the idle state of the internal combustion engine 2.

As shown in Figure 6 and Figure 8 (b), the idle air enters the idle air adjusting valve 75 from the upstream side of the throttle valve 63 of the throttle body 52, i.e. from an idled air slot 76 formed and projected to the intake passage 52a of the cylindrical connection part 60, as indicated by a small arrow m, and passes through the idle air adjustment valve 75 according to an opening of the valve preset by the amount of screw of the idle air screw 62. The idle air set by the idle air adjusting valve 75 is passed through the idle air supply port 77 as indicated by a small arrow m, and is supplied to the intake passage 52a on the downstream side (the intake manifold side 53) from the throttle valve 63 as shown in Figure 7 (b).

Although the idle air supply is pre-set according to the characteristics and working conditions of the individual bodies of the machine, it can be readjusted with the idle air screw 62.

As shown in Figure 2, although the storage box 24 is placed on the throttle body 52 and the connecting tube 511, the lower part of the storage box 24 is provided with a sight glass 86 to facilitate inspection of the screw of idle air 62. The sight 86 is closed, generally, with a cover 87 made of rubber, resin or the like.

As shown in Figure 6 (a), the throttle opening sensor 68 and the start air control valve 70 are vertically juxtaposed and mounted on the throttle body 52, the two valve mounting bolts 71 of the starter air control valve 70 are disposed side by side in the longitudinal direction of the vehicle, and the fastening pin of the sensor 69 of the accelerator opening sensor 68 is placed in the vertical line P between the two bolts of valve assembly 71.

Therefore, mutual interference of the sensor fixing bolt 69 and the valve mounting bolts 71 can be avoided.

A first wiring coupler 80 which connects the throttle opening sensor 68 to the outside and a second wiring coupler 81 which connects the start air control valve 70 to the outside are positioned separately by facing forward in the direction of intersection with the V-axis of the throttle valve shaft 64.

The first wiring coupler 80 is fitted on the throttle opening sensor 68 provided on the throttle valve shaft 64 to steer in the same direction with the substantially vertical positions equal to the Y axis of the intake passage 52a. However, the second wiring harness 81 of the start air control valve 70 is located away from the intake passage 52a of the throttle body 52.

Then, the W axis of the second wiring harness 81 is placed with a gradient at an acute angle 0 to the Y axis of the intake passage 52a to be positioned along the intake passage 52a, and a cable (b) of the second coupler of wiring 81 approaches, substantially, towards the same direction of a wiring (a) from the first wiring harness 80, so that the wiring (a), (b) (see figures 2 and 3) can easily be put together .

As shown in Figure 2 and Figure 3, the frame of the vehicle body 4 of the motorcycle 1 includes a pair of right and left rear frames 20L, 20R and a transverse member 21 mounted therebetween, the transverse member 21 positioned opposite the first and second wiring harnesses 80, 81 and the cables (a), (b) of the first and second wiring harnesses 80, 81 are guided to an area surrounded by the transverse member 21, the frames Rear right and left 20K, 20R, and the upper part of the power unit 5.

The cable (a) and the cable (b) are bent to the left and the rear of the vehicle in the previous area, and are joined in a bundle or a cable (c) joined together as a cable collector.

Although the cables (a), (b) of the first and second wiring harnesses 80, 81 are bent backwards in a straight line in the illustrations shown in Figure 2 and Figure 3, the cables can be rotated largely in the area above, placed along the transverse member 21, once supported, and then folded back.

In that case, the transverse member 21 is curved to project upwards and towards the front of the vehicle, so that the curvature of the cables (a), (b) of the first and second wiring harnesses 80, 81 can be keep large, and the rolling amount of the internal combustion engine 2 can be increased.

The cable (c) moves to the right in the direction of the width of the vehicle in front of the rear wheel 34, is bent forward again as a U-shape, and is included with a cable (d) of a starter 82 placed on the upper part of the power unit 5, or attached to a cable (e) as a cable collector, and placed forward to the right of the power unit 5.

The cable (e) is bent backwards near a right connection part 23R of the transverse member 21 and the right rear frame 20R (part C in figure 3), locked along the right rear frame 20R suitably by a clamp of cable collector 85, extended to a control unit (a programmed fuel injection control unit) 83 fitted to the rear of the right rear frame 20R, and connected to the control unit 83.

The cable (e) is largely arranged as a U-shape in a front area and behind the folded part C near the right connection part 23L, so as to provide a sufficient bending margin between the side of the oscillating power unit 5 and the frame side of the vehicle body 4.

In addition, the transverse member 21 is formed and bent to project up towards the front of the vehicle, and the left rear frame 20L is formed in a different position under the right rear frame 20R, so that the transverse member 21 approaches the first and second wiring harnesses 80, 81, thereby facilitating the removal of the cables (a), (b) of the first and second wiring harnesses 80, 81.

Although the inlet manifold 53 is provided independently of the cylinder head 42 of the internal combustion engine 2, and is secured and fixed to the cylinder head 42 by the bolt 55, an insertion area A for a manifold fitting fitter input 53 to the cylinder head 42 is superimposed on the first and second wiring harnesses 80, 81 as seen in the vehicle width direction (see FIG. 2), and is positioned on the central side of the body of the vehicle. vehicle (see Figure 3) of the first and second wiring harnesses 80, 81 as seen in the vertical direction, thereby facilitating the clamping and securing of the input manifold.

Although the throttle body 52 is fastened and attached to the intake manifold 53 by the bolt 54, the joining portions of the first and second wiring harnesses 80, 81 to the cables (a), (b) are located in the manifold of entrance 53 next to the connecting face B (see Figures 2, 3) of the intake manifold 53, whereby the throttle valve 63 can be placed close to the combustion chamber of the internal combustion engine 2.

In the previous embodiment, the following effects occur.

That is, since the cylindrical connecting part 60 of the throttle body 52 positioned in the direction of rotation to the cylinder part 44 of the internal combustion engine 2 is provided with the positioning part 61 in the direction of rotation of the connection 51, the variation in alignment in the direction of rotation of the connecting tube 51 and the distortion of shape due to variation can be reduced.

Since the positioning part 61 is placed in a position to engage with the engaging part 58 provided on the side of the tube connecting the cylindrical part 56 of the connecting tube 51 in the body of the accelerator 52, the positioning of the tube is performed. connection 51 in the direction of rotation simultaneously with the work to connect the connection tube 51 to the accelerator valve 52 to improve the working capacity.

Since the positioning part 61 is the protruding part for the idle air screw 62 provided in the accelerator body 52 and the protruding part also serves as the positioning part 61, it can be prevented that the throttle body is made each bigger time

Further, since the positioning part 61 is provided eccentrically on one side of the Y axis of the intake passage 52a, the projection of the positioning part 61 in the height direction can be reduced so that the throttle valve 52 can be improved. .

Since the cylindrical connection part 60 to the connection tube 51 in the throttle body 52 is formed eccentrically on one side with the Y axis of the intake passage 52a, and the side of the tube connecting the cylindrical portion 56 of the connection tube 51 is formed eccentric to a side similar to the side of the throttle body 52 with the axis S of the intake passage of the tube side 51a in the connection tube 51, even when the cylindrical connecting part 60 of the throttle body 52 is formed eccentric with the inlet passage 52a and the side of the tube connecting the cylindrical portion 56 of the connecting tube 51 is formed eccentric with the inlet passage on the side of the tube 51a, positioning itself in the direction of rotation of the connecting tube 51 can eliminate the misalignment of the Y, S axes of both intake passages 52a, 51a and smooth the connection between the throttle body 52 and the connecting tube 51 and achieve a stabilization of the performance in the combustion engine internal drive 2.

Since the connecting tube 51 is provided with the linear part for the predetermined distance on the upstream side of the side of the tube connecting the cylindrical part 56, the retention in the connection work can be improved with the linear part 51d to improve the ability to work and avoid changing position in the direction of rotation.

Since the cable guide part 57 projects on the outer surface of the linear part 51d on the eccentric side of the tube side connecting the cylindrical part 56 with the axis S of the inlet passage of the tube side 51a, and the Cable guide part 57 is provided with the recessed portion 57a where the cable is hooked, the space for guiding the cable can be easily secured to improve the performance of the cable design on the motorcycle 1.

Further, since the cable is an accelerator cable 66, which is positioned extending from the throttle drum 65 mounted on the end of the right shaft of the throttle valve shaft 64 provided in the throttle body 52 to be oriented in the direction of the width of the vehicle, which penetrates to the outside of the throttle body 52, bent rearwardly as a U-shape in the connecting tube 51 towards the front of the motorcycle, the throttle cable 66 can be placed further down to lower the height of the seat 6.

Since the storage box 24 of the motorcycle 1 is placed on the throttle body 52 and the connecting tube 51, and the sight window 86 for the idle air screw 62 is provided in the lower part of the storage box 24 , even when the upper body of the accelerator 52 and the connecting tube 51 are covered with the large storage box 24, the idle air screw 62 can be inspected without removing the storage box 24 to improve the capacity of work.

Furthermore, in the motorcycle 1, in which the internal combustion engine 2 and the power transmission 3 to the rear wheel 34 are integrated and the power unit 5 which is pivotably mounted in the body frame of the vehicle 4 is provided under the seat 6, the throttle body 52 for controlling the intake amount of the internal combustion engine 2 is provided between the power unit 5 and the seat 6, the accelerator opening sensor 68 for detecting the opening of the accelerator is provided at the end of the axle shaft of the throttle valve 64 provided in the throttle body 52 for orienting in the direction of the width of the vehicle, in addition, the control valve of the starter air 70 as the actuator for controlling the throttle body 52 is mounted on the throttle body 52 near the throttle opening sensor 68 from the same direction, and the first wiring coupler 80 s e connects the throttle opening sensor 68 to the outside and the second wiring coupler 81 that connects the start air control valve 70 to the outside are separately placed in the same direction in the front and rear and also side by side in the direction of intersection with the throttle valve shaft 64, whereby a plurality of independent sensors are mounted to each other, the start air control valve 70 as an actuator and the opening of the accelerator 68 to the throttle body 52 in the same direction, so that the machining performance of the throttle body 52 can be improved.

Further, since the first and second wiring harnesses 80, 81 are positioned to perform the wiring in the direction of intersection with the throttle valve shaft 64, the projection towards the throttle valve shaft can be avoided, and even more so that the directions of the first and second wiring couplings 80, 81 are equal longitudinally, the working capacity for pulling, collecting and connecting the cables (a), (b) can be improved.

Since the throttle opening sensor 68 and the start air control valve 70 are positioned side by side in the vertical direction in the throttle body 52, and the second wiring coupler 81 of the throttle control valve starter air 70 is located away from the intake passage 52a of the throttle body 52 is arranged with a gradient at an acute angle 0 along the intake passage 52a, the cable (a) of the first wiring harness 80 and the cable (b) of the second wiring harness 81 are brought together, the cables (a), (b) can be easily joined to reduce the tensile space of the cables (a), (b).

In the motorcycle 1, the suspension part 40 holding the power unit 5 in the body frame of the vehicle 4 is provided below the power unit 5, and the throttle body 52 is located just above the part of the vehicle. suspension 40 and above the power unit 5, so that the cable parts (a), (b) of the first and second wiring harnesses 80, 81 are arranged to be balanced in the longitudinal direction of the motorcycle 1 to the balance the power unit 5 caused by the displacement of the motorcycle 1. Therefore, the rolling in the direction of the width of the vehicle and in the vertical direction can be restricted, the wiring structure of the throttle body can be miniaturized, so that the limitations in the width of the body of the vehicle and the height of the seat 6 in Motorcycle 1 can be easily removed.

The frame of the vehicle 4 of the motorcycle 1 includes the right and left rear frames 20L, 20R, and the cross member 21 mounted therebetween, the transverse member being positioned in front of the first and second wire couplers 80, 81 and the cables (a ), (b) the first and second wiring harnesses 80, 81 are guided to the area surrounded by the transverse member 21, the right and left rear frames 20L, 20R and the upper part of the power unit 5, so that the cables (a), (b) are protected by transverse member 21, and space for wiring works is increased.

The cables (a), (b) are folded back on the back of the motorcycle 1 in the anterior area, then they are joined in the cable (c), they are traversed in the direction of the width of the vehicle in front of the wheel rear 34, bent backwards as a U-shape, and connected to the wire (d) of the starter motor 82 positioned on the top of the power unit 5, so that the wiring can be made at the periphery of the motor 2 internal combustion more efficiently.

Since the transverse member 21 is formed and bent to project upward towards the front of the vehicle of the motorcycle 1, the curvature of the cables (a), (b) of the first and second wiring harnesses 80, 81 can be maintained Large to increase the amount of rocking of the internal combustion engine 2. In this way, you can improve the comfort of driving the motorcycle 1.

Since the right and left rear frames 20L, 20R are formed in vertically different positions from each other, so that the transverse member 21 approaches the first and second wiring harnesses 80, 81, the tensile performance of the cables (a), (b) from the first and second wiring harnesses 80, 81.

According to the present embodiment, in one of the accelerator opening sensors 68 and the starting air control valve 70, the two valve mounting bolts 71 which are mounting members of the start air control valve 70 they are disposed side by side in the longitudinal direction of the motorcycle 1 and, on the other hand, the fixing bolt of the sensor 69, which is an articulated element of the accelerator opening sensor 68, is placed on the vertical line P between the valve mounting bolts 71, so that mutual interference of the throttle opening sensor 68 and the start air control valve 70 can be avoided, and the throttle opening sensor 68 and the throttle control valve can be prevented. Start air 70 can be brought together. Therefore, the throttle body 52 and the wiring structure thereof can be miniaturized.

The throttle body 52 is clamped in the intake manifold 53 provided independently of the cylinder head 42 of the internal combustion engine 2, the insertion area A of the adjustment fitting of the intake manifold 53 to the cylinder head 42 overlaps to the first and second wiring harnesses 80, 81 as viewed in the width direction of the vehicle, and is positioned on the central side of the vehicle body from the first and second wiring harnesses 80, 81 as seen in FIG. vertical direction, so that while the throttle body 52 and the cylinder head 42 are brought together to achieve miniaturization, clamping and fixing of the intake manifold 53, since the separate body can be provided. Therefore, the productivity of the cylinder head 42 can be improved by providing the intake manifold 53 as the separate body.

In the throttle body 52, with respect to the joining face B to the input manifold 53, the joining portions of the first and second wiring harnesses 80, 81 to the cables (a), (b) are both located in the side of the intake manifold 53, whereby the throttle body 52 can be further miniaturized and the throttle valve 63 can be positioned close to the combustion chamber of the internal combustion engine. Therefore, the responsiveness of the internal combustion engine 2 can be increased and miniaturization and performance improvement can be achieved.

Although the above description refers to an embodiment of the invention, it goes without saying that the mode can be partially modified within the scope of the essence of the invention.

For example, a modified form in which the arrangement of the cables of the first and second wiring harnesses 80, 81 is varied will now be described simply with reference to Fig. 10 and Fig. 11.

The present modified form is similar to the previous embodiment, except that the arrangement of the cables is different, and in Figure 10 and Figure 11, the same reference numbers are given to the same parts, or the description is deleted, and the different points will be described.

As shown in Figure 10 and Figure 11, a wire a 'and a wire b' of the first and second wiring couplings 80, 81 are guided to an area surrounded by a transverse member 21 in front of the first and second wiring couplings 80, 81, right and left rear frames 20L, 20R, and the upper part of a power unit 5, once rotated to the left near the transverse element 21 (part D in figure 3), then bent backwards as a U-shape, supported along the transverse member 21, or tied in a bundle or post in a cable collector to form a cable attached c '.

The transverse member 21 is formed and bent to project upward towards the front of a vehicle, the left rear frame 20L being formed in a different position under the right rear frame 20R, so that the transverse member 21 approaches the first and second wiring harnesses 80, 81. Therefore, in the present modified form, the pulling of the cables a ', b' of the first and second wiring harnesses 80, 81 is especially facilitated.

In a part D, a flexion margin with sufficient space for the wiring is obtained, in addition, since the transverse member 21 is formed and bent to project towards the front of the vehicle, bending the cables to ', b' from the first and second wiring harnesses 80, 81 and the attached cable c 'can be kept large to increase the amount of rocking of the internal combustion engine 2.

The cable c 'then extends from the vicinity of a right connection part 23R of the transverse member 21 and the right rear frame 20R along the right rear frame 20R, suitably blocked by a cable catcher clamp 85, extended to a control unit (a programmed fuel injection control unit) 83 fitted to the rear of the right rear frame 20R, and connected to the control unit 83.

According to the present modified form, the cables a ', b', c 'are thus maintained in the transverse member 21, whereby the range of rocking of the cables can be regulated and the wiring space can be reduced.

Although the motorcycle 1 is shown as a vehicle, especially the small vehicle in the previous embodiment and the modified form thereof, when adopting a similar power unit 5 and an accelerator body 52, the invention can be applied to the other modes, such as sandboxes with three wheels and four wheels.

List of reference signs

1 Motorcycle (vehicle)

2 Internal combustion engine

3 Power transmission

4 Frame of the vehicle body

5 Power unit

6 Seat

7 Power unit box

15 Main frame

17 Transverse frame

18 Suspension link

19 Pivot plate

20L Left rear frame

20R Right rear frame

21 Transverse member

24 Storage box

25 Fuel tank

34 Rear wheel

40 Suspension part

42 Cylinder head

44 Part of the cylinder

50 Air filter

50th Air filter box

50b Air filter element

50d Clean side camera

51 Connection tube

51th Step of lateral intake of the tube

51d Linear part

52 Throttle body

53 Input collector

54 Bolt (regulatory member)

55 Bolt

56 Cylindrical part of lateral connection of the tube

57 Guide part of the cable

57a Recessed part

58 Part of coupling

60 Cylindrical connection part.

61 Positioning part (outgoing part)

62 Idle air screw

63 Throttle valve

64 Throttle valve shaft

65 Throttle drum

66 Throttle cable

68 Throttle opening sensor 69 Sensor mounting bolt

70 Start air control valve 71 Valve mounting bolt

86 Peephole

87 Cover

a ~ e cable

a '~ c' cable

Claims (7)

A structure of the intake system of a power unit (5), which is mounted on a vehicle (1), and in which an internal combustion engine (2) and a power transmission (3) are integrated between yes, an air filter (50) is disposed in a position remote from a part of the cylinder (44) of the internal combustion engine (2), an accelerator body (52) is placed in a position near the part of the cylinder (44) and the air filter (50) and the throttle body (52) are connected to each other by a connecting tube (51), a regulating member (54), for regulating the throttle body (52) to rotate about the axis of an intake passage (52a) thereof, regulates the throttle body (52) at a position in the direction of rotation about the axis with respect to the part of the cylinder (44), the throttle body (52) being assembled to the cylinder part (44) through an intake manifold (53) and supported integrally by the cylinder part (44) ; Y in the throttle body (52), a cylindrical connection part (60) to the connecting tube (51) is provided with a positioning part (61) for positioning the connecting tube (51) in the direction of rotation, a end downstream of the connecting tube (51) is provided with a side of the tube connecting the cylindrical part (56) for connection to the throttle body (52), characterized in that the side of the tube connecting the cylindrical part (56) ) is provided with a coupling part (58) composed of two projections projecting towards the side of the accelerator body (52), the engaging part (58) composed of the two projections holding the positioning part (61) between to engage with them, thereby performing the positioning in the direction of rotation about the axis of the tube side connecting the cylindrical part (56), and the positioning part (61) is a projecting part (61) for a idle air screw (62) provided in the throttle body (52). The intake system structure of a power unit according to claim 1, wherein the positioning part (61) is provided offset on one side with respect to the axis of the intake passage (52a), as seen in the vertical direction. 3. The structure of the intake system of a power unit according to claims 1 or 2, wherein: in the throttle body (52), the cylindrical connection part (60) to the connection tube (51) is offset on one side with respect to the axis of the intake passage (52a); Y the side of the tube connecting the cylindrical part (56) of the connecting tube (51) is off-center in the same direction as a side in which the cylindrical connecting part (60) of the throttle body (52) is off-center with respect to to the axis of the intake passage (52a), with respect to the axis of the intake passage of the tube side (51a) in the connection tube (51). The intake system structure of a power unit according to claim 3, wherein the connecting tube (51) includes a linear part (51d) for a predetermined distance on the upstream side of the connecting tube side the cylindrical part (56). The intake system structure of a power unit according to claim 4, wherein a cable guide part (57) projects onto the outer surface of the linear part (51d) on the side where the side of the The tube connecting the cylindrical part (56) is off-centered with respect to the axis of the intake passage of the tube side (51a), and the cable guide part (57) includes a recessed portion (57a) where a cable is hooked. The intake system structure of a power unit according to claim 5, wherein the cable is an accelerator cable (66), which is bent backwards as a U-shape from an accelerator drum (65) adjusted at the ends of the right or left shaft of an accelerator valve shaft (64) provided in the throttle body (52) oriented in the width direction of the vehicle, which penetrates the outside of the throttle body (52) in the connecting tube (51) and arranged in the front part of a vehicle (1). The intake system structure of a power unit according to claim 1, wherein a storage box (24) of the vehicle (1) is disposed on the throttle body (52) and the connecting tube (51). ), and a sight glass (86) of the idle air screw (62) is provided in the lower part of the storage box (24).