JP2004124874A - Throttle body device for engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve assemblability, and to reduce the manufacturing cost of a throttle body with sensors for an engine by housing a throttle sensor and an intake air temperature sensor in a common unit housing to form a unit, and fitting it to a throttle body all at once. <P>SOLUTION: This throttle body with sensors for an engine is formed by fitting the throttle sensor 17 for electrically detecting opening of a throttle valve 11 and the intake air temperature sensor 18 for electrically detecting the intake air temperature inside an intake air passage 10 to the throttle body 5 provided with a throttle valve 11 in the intake air passage 10 thereof. In this throttle body with sensors for an engine, the throttle sensor 17 and the intake air temperature sensor 18 are installed in the common unit housing 20, which is fastened to the throttle body 5 by bolts, to form a sensor unit 19. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a throttle body device for an engine applied to an engine of a vehicle such as a motorcycle or an automobile. In particular, the present invention relates to a throttle body provided with a throttle valve for opening and closing the intake passage in an intake path. And an intake air temperature sensor for electrically detecting an intake air temperature in an intake passage.
[0002]
[Prior art]
Such a motorcycle throttle body device is already known, for example, as disclosed in Patent Document 1 below.
[0003]
[Patent Document 1]
Japanese Utility Model Laid-Open No. 3-122246 [0004]
[Problems to be solved by the invention]
In the conventional engine throttle body device, the throttle sensor and the intake air temperature sensor are individually attached to the throttle body, so that the assemblability is poor and it has been difficult to reduce the manufacturing cost.
[0005]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a throttle sensor and an intake air temperature sensor are housed in a common unit housing to form a unit, which is attached to a throttle body at once to improve assemblability. It is another object of the present invention to provide the engine throttle body device capable of reducing the manufacturing cost.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a throttle body having an intake passage, a throttle valve for opening and closing the intake passage, a throttle sensor for electrically detecting the opening of the throttle valve, and an electric sensor for detecting the intake air temperature in the intake passage. In a first aspect of the invention, a throttle unit and an intake air temperature sensor are mounted in a common unit housing screwed to the throttle body. The feature of.
[0007]
According to the first feature, after assembling the sensor unit and assembling the throttle body and the throttle valve in parallel, the throttle body device can be obtained by connecting them at once. This makes it possible to efficiently assemble the throttle body device and to perform a performance test of the sensor unit before attaching the unit to the throttle body.
[0008]
According to the present invention, in addition to the first feature, the unit housing is integrally formed with a hollow cylindrical body that penetrates a side wall of the throttle body and faces a closed end to an intake passage. A second feature is that the intake air temperature sensor is housed with the sensor element brought into close contact with the inner surface of the tip portion.
[0009]
The sensor element corresponds to a thermistor 35 in an embodiment of the present invention described later.
[0010]
According to the second feature, the intake air temperature sensor is housed in a hollow cylindrical body having a closed end integrated with the unit housing, thereby preventing dust and waterproofing of the intake air temperature sensor without using a special sealing member. The temperature of the intake air in the intake passage can be accurately detected by bringing the sensor element of the intake air temperature sensor into close contact with the inner surface of the closed end of the hollow cylindrical body.
[0011]
Further, in addition to the first or second feature, the present invention is characterized in that the hollow cylinder is arranged on a plane including the axis of the intake passage and the axis of the throttle valve in parallel with the axis of the throttle valve. 3.
[0012]
According to the third feature, the length of the hollow cylinder is minimized, and the sensor unit can be made compact.
[0013]
Still further, according to the present invention, in addition to any one of the first to third features, a common circuit board on which a detection circuit corresponding to each of a throttle sensor and an intake air temperature sensor is printed is mounted in the unit housing. Is a fourth feature.
[0014]
According to the fourth feature, the electrical connection between the throttle sensor and the intake air temperature sensor and the circuit board can be easily automated, thereby improving the productivity and further reducing the manufacturing cost.
[0015]
Still further, according to the present invention, in addition to the fourth feature, a single coupler is provided on the unit housing, which collectively includes connection terminals electrically connected to a throttle sensor and an intake air temperature sensor via the circuit board. The fifth feature is that they are integrally formed.
[0016]
According to the fifth feature, the connection between the throttle sensor and the intake air temperature sensor and the electronic control unit can be completed by a single connection between the coupler and the corresponding external coupler, thereby improving the mountability on the vehicle. Can be good.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below based on preferred embodiments of the present invention shown in the accompanying drawings.
[0018]
1 is a side view of a motorcycle according to an embodiment of the present invention, FIG. 2 is an enlarged view of an engine portion in FIG. 1, FIG. 3 is an enlarged side view of a throttle body device in FIG. 2, and FIG. FIG. 5 is a view taken in the direction of the arrow 5 in FIG. 4, and FIG. 6 is a sectional view taken along the line 6-6 in FIG.
[0019]
In the following description, front and rear, left and right refer to a motorcycle as a reference.
[0020]
First, in FIG. 1, a power unit Up is suspended on a body frame F of a scooter type motorcycle M behind a step floor S via a horizontal pivot shaft Pv so as to be vertically swingable. The rear cushion C is attached between the power units Up.
[0021]
The power unit Up includes a fuel injection engine E having a forwardly inclined cylinder portion 2 protruding from the crankcase 1 and a transmission T for extending the transmission case 3 rearward from one side of the crankcase 1. At the rear end of the transmission case 3, a rear wheel Wr driven by the power of the engine E via a transmission T is supported. A luggage box Bx capable of accommodating a helmet or the like is mounted on the body frame F above the power unit Up, and a riding seat (not shown) also serving as a lid is mounted on the luggage box Bx.
[0022]
As shown in FIG. 2, a pair of left and right protruding walls 1a rotatably supported at both ends of the pivot shaft Pv are integrally formed at an upper portion of the crankcase 1, and between the two protruding walls 1a. In addition, an intake pipe 4 extending rearward from the upper part of the cylinder portion 2 is disposed close to the upper surface of the pivot shaft Pv, and a throttle body 5 is connected to a rear end of the intake pipe 4. A space 8 corresponding to a predetermined vertical stroke of the power unit Up is secured between the throttle body 5 and the luggage box Bx.
[0023]
An electromagnetic fuel injection valve 7 for injecting fuel toward an internal intake port 6 is mounted on the cylinder section 2.
[0024]
3 to 6, a throttle body 5 has an intake path 10 extending in the front-rear direction of the motorcycle M connected to the inside of the intake pipe 4, and a butterfly type throttle disposed in an intermediate portion of the intake path 10. The valve 11 is supported by a valve shaft 12 that extends through the middle part of the throttle body 5 and extends in the left-right direction of the motorcycle M. Therefore, by rotating the valve shaft 12, the throttle valve 11 can be opened and closed.
[0025]
At one end of the valve shaft 12, an operation wire 13 to be operated by a user of the motorcycle M is connected, and a throttle drum 14 wound around the operation is fixed to the throttle drum 14. A return spring 15 biasing in the direction is connected. Thus, the throttle drum 14 connected to the valve shaft 12 rotates in the opening direction of the throttle valve 11 by pulling the operation wire 13, and can rotate in the closing direction of the throttle valve 11 by the urging force of the return spring 15.
[0026]
As shown in FIG. 6, the other end of the valve shaft 12 opposite to the throttle drum 14 has a throttle sensor 17 for electrically detecting the opening of the throttle valve 11 and a temperature of the intake air in the intake passage 10. A sensor unit 19 having an intake air temperature sensor 18 for electrically detecting is attached.
[0027]
In the above, the throttle body 5, the throttle valve 11, the valve shaft 12, and the sensor unit 19 are components of the throttle body device Tb.
[0028]
A unit housing 20 of the sensor unit 19 has a mounting flange 21a on one end outer periphery and a synthetic resin housing main body 21 having the other end opened, and a synthetic resin lid plate for sealing the open surface of the housing main body 21. The mounting flange 21a is joined to the mounting surface 5a of the throttle body 5 on the side from which the other end of the valve shaft 12 protrudes by a pair of upper and lower screw members 23a and 23b. Reference numeral 20 is fixed to the throttle body 5. At this time, a positioning cylindrical portion 24 protruding from the outer end of the housing body 21 is fitted into a positioning recess 25 formed concentrically with the valve shaft 12 on the mounting surface 5a.
[0029]
A throttle sensor 17 and an intake air temperature sensor 18 are mounted in the housing body 21, and a common circuit board 26 is sandwiched between the housing body 21 and the cover plate 22.
[0030]
The throttle sensor 17 includes a rotor 28 rotatably loosely fitted into a stepped support hole 27 formed in the housing body 21, and a conductive brush 40 protruding from an end surface of the rotor 28 toward the circuit board 26. , 40 and a resistor 41 which is printed on the circuit board 26 and in which the conductive brushes 40, 40 are in sliding contact. The rotor 28 is connected to the other end of the valve shaft 12 when the rotor 28 is fitted in the support hole 27. It has connecting holes 29 for fitting and connecting, and U-shaped leaf springs 30 for eliminating backlash are inserted into these fitting connecting portions. A support shaft 31 coaxially arranged with the valve shaft 12 is provided on an end surface of the rotor 28, and the support shaft 31 is rotatably supported by a support hole 32 provided in the circuit board 26.
[0031]
On the circuit board 26, a first detection circuit for detecting an opening degree of the throttle valve 11, that is, a rotation angle of the valve shaft 12 as a voltage between both ends of the resistor 41 is printed.
[0032]
A ventilation groove 10a extending along a plane P including the axis A of the intake path 10 and the axis B of the valve shaft 12 is formed on an inner wall of the intake path 10 upstream of the throttle valve 11, and a unit housing 20 is formed. A relatively thin hollow cylindrical body 33 is integrally formed through the through hole 34 in the side wall of the throttle body 5 so that the closed end portion 33a faces the ventilation groove 10a. At this time, the hollow cylindrical body 33 is disposed parallel to the valve shaft 12 on the plane P.
[0033]
The intake air temperature sensor 18 includes a thermistor 35 that is in close contact with the inner surface of the closed distal end portion 33a of the hollow cylindrical body 33, and a terminal 36 that extends from the thermistor 35 and is connected to a second detection circuit printed on the circuit board 26. The second detection circuit is configured to detect a resistance value of the thermistor 35 that changes according to a change in intake air temperature as a voltage. After housing the intake air temperature sensor 18, the synthetic resin 43 is potted in the hollow portion of the hollow cylindrical body 33.
[0034]
2 to 4, a single coupler 37 is integrally connected to the mounting flange 21a around the lower screw member 23b which joins the mounting flange 21a of the unit housing 20 to the mounting surface 5a of the throttle body 5. The coupler 37 is disposed immediately below the throttle body 5 and behind the pivot shaft Pv. A reinforcing rib 45 following the mounting flange 21a is integrally provided on the back surface of the coupler 37.
[0035]
The coupler 37 includes first and second connection terminals 38 connected to a first detection circuit on the circuit board 26 corresponding to the throttle sensor 17 and a second detection circuit on the circuit board 26 corresponding to the intake air temperature sensor 18, respectively. 39 are provided. The connection port 37a of the coupler 37 faces the same side as the throttle drum 14.
[0036]
Thus, the detection signals of the throttle sensor 17 and the intake air temperature sensor 18 are input to a control unit (not shown) through the coupler 37 and the external coupler 44 connected thereto, and the control unit accordingly responds to the fuel injection valve. 7, a valve opening signal is output.
[0037]
A seal member 42 for sealing the opening of the through hole 34 and the positioning recess 25 is interposed between the joint surfaces of the throttle body 5 and the unit housing 20.
[0038]
Next, the operation of this embodiment will be described.
[0039]
A throttle body 5 is connected to a rear end of an intake pipe 4 arranged close to an upper surface of a pivot shaft Pv that supports the power unit Up so as to be able to swing up and down, and a throttle drum 14 is provided on one side of the throttle body 5. A sensor unit 19 having a throttle sensor 17 and an intake air temperature sensor 18 is disposed on the side, and a single coupler 37 connected to both the sensors 17 and 18 is disposed immediately below the throttle body 5 and behind the pivot shaft Pv. Therefore, the dead space behind the pivot axis Pv can be used for installing the coupler 37, and therefore, between the throttle body 5 and the luggage box Bx thereabove, the power unit Up, which is not obstructed by the coupler 37 at all. A sufficient space 8 for vertical swing can be secured, and the capacity of the luggage box Bx is reduced. There is no need to lack.
[0040]
By the way, when assembling the throttle body device Tb, the sensor unit 19 is assembled by attaching the throttle sensor 17 and the intake air temperature sensor 18 to the unit housing 20 in advance, and the performance of the sensors 17 and 18 is checked. When the throttle valve 11 is mounted on the throttle body 5 and the mounting flange 21a of the unit housing 20 is fixed to the mounting surface 5a of the throttle body 5 by screw members 23a and 23b, the valve shaft 12 of the throttle valve 11 is throttled. In addition to fitting into the connection hole 29 of the rotor 28 of the sensor 17, the distal end 33 a of the hollow cylindrical body 33 containing the intake air temperature sensor 18 faces the ventilation groove 10 a of the intake passage 10, and the throttle body device Tb Can be assembled at once.
[0041]
As described above, the assembly of the sensor unit 19 and the assembly of the throttle body 5 and the throttle valve 11 are performed in parallel, and then they are combined to obtain the throttle body 5 with the sensor at once. This can be performed, and the performance test of the sensor unit 19 can be executed before the sensor unit 19 is attached to the throttle body 5.
[0042]
Further, a common circuit board 26 on which a detection circuit corresponding to each of the throttle sensor 17 and the intake air temperature sensor 18 is printed is mounted in the unit housing 20. The automatic connection can be easily automated, and the productivity can be further improved, and the production cost can be further reduced.
[0043]
Further, the unit housing 20 is integrally formed with a single coupler 37 having first and second connection terminals 38 and 39 corresponding to the throttle sensor 17 and the intake air temperature sensor 18, respectively. However, since it faces the same side as the throttle drum 14, the work of connecting the operation wire 13 to the throttle drum 14 and the work of connecting the external coupler 44 to the coupler 37 on the motorcycle M assembly line. It can be easily performed by one worker on one side of the motorcycle M on one side, and the connection between the throttle sensor 17 and the intake air temperature sensor 18 and the electronic control unit (not shown) can be made by one connection of the coupler 37 and the external coupler 44. The connection can be completed, and the mountability to the motorcycle M is good.
[0044]
Further, although the coupler 37 is disposed below the throttle body 5 different from the position of the sensor unit 19 in the throttle body 5, the coupler 37 is integrally connected to the unit housing 20 so as to be supported by the mounting flange 21 a of the unit housing 20. Therefore, a mounting member dedicated to the coupler 37 is not required, which can contribute to simplification of the structure.
[0045]
In addition, since the coupler 37 is integrated with the mounting flange 21a near the lower screw member 23b for fixing the mounting flange 21a of the unit housing 20 to the throttle body 5, the rigidity at the base of the coupler 37 is lower. Since the rigidity is strengthened by the reinforcing ribs 45 on the back surface of the coupler 37, the coupler 37 can sufficiently withstand the pull-out load from the external coupler 44.
[0046]
Further, since the intake air temperature sensor 18 is housed in the hollow cylindrical body 33 having a closed end integrated with the unit housing 20, dust and water resistance of the intake air temperature sensor 18 can be achieved without using a special sealing member. In addition, since the thermistor 35 of the intake air temperature sensor 18 is closely attached to the inner surface of the closed distal end portion 33a of the hollow cylindrical body 33, the intake air temperature in the intake passage 10 can be accurately detected. In addition, since the hollow cylinder 33 is disposed parallel to the axis A of the valve shaft 12 on a plane P including the axis A of the intake passage 10 and the valve axis B, the length of the hollow cylinder 33 is minimized. , The sensor unit 19 can be made compact.
[0047]
The present invention is not limited to the above embodiment, and various design changes can be made without departing from the gist of the present invention. For example, the present invention is also applicable to automobile engines.
[0048]
【The invention's effect】
As described above, according to the first aspect of the present invention, a throttle sensor for electrically detecting the opening degree of a throttle valve, a throttle sensor for electrically detecting the opening of the throttle valve, In an engine throttle body device equipped with an intake air temperature sensor for electrically detecting the temperature, the sensor unit is configured by mounting the throttle sensor and the intake air temperature sensor in a common unit housing screwed to the throttle body. After the assembly of the sensor unit and the assembly of the throttle body and the throttle valve are performed in parallel, the throttle body device can be obtained by connecting them at once. This makes it possible to efficiently assemble the throttle body device and to perform a performance test of the sensor unit before attaching the unit to the throttle body.
[0049]
According to the second aspect of the present invention, in addition to the first aspect, the unit housing is integrally provided with a hollow cylindrical body that penetrates a side wall of the throttle body and faces a closed end to an intake path. The intake air temperature sensor was housed inside the hollow cylinder with the sensor element in close contact with the inner surface of the tip, so that the air intake temperature sensor was housed in a hollow cylinder with a closed end integrated with the unit housing. Without using a special sealing member, the intake air temperature sensor can be made dust-proof and waterproof, and the sensor element of the intake air temperature sensor can be brought into close contact with the inner surface of the closed end of the hollow cylinder, so that the inside of the air intake passage The intake air temperature can be accurately detected.
[0050]
According to a third aspect of the present invention, in addition to the first or second aspect, the hollow cylinder is disposed on a plane including the axis of the intake passage and the axis of the throttle valve, and the axis of the throttle valve is aligned with the axis of the throttle valve. Since they are arranged in parallel, the length of the hollow cylindrical body is minimized, and the sensor unit can be made more compact.
[0051]
According to a fourth aspect of the present invention, in addition to any one of the first to third aspects, a common circuit in which detection circuits respectively corresponding to a throttle sensor and an intake air temperature sensor are printed in the unit housing. Since the circuit board is mounted, the electrical connection between the throttle sensor and the intake air temperature sensor and the circuit board can be easily automated, and the productivity can be improved, and the production cost can be further reduced.
[0052]
According to a fifth aspect of the present invention, in addition to the fourth aspect, connection terminals electrically connected to the throttle sensor and the intake air temperature sensor via the circuit board are integrated in the unit housing. Since the single coupler provided is integrally formed, the connection between the throttle sensor and the intake air temperature sensor and the electronic control unit can be completed by a single connection between the coupler and the corresponding external coupler. Can be easily mounted.
[Brief description of the drawings]
FIG. 1 is a side view of a motorcycle according to an embodiment of the present invention. FIG. 2 is an enlarged view of an engine unit in FIG. 1. FIG. 3 is an enlarged side view of a throttle body device in FIG. FIG. 5 is a view taken in the direction of the arrow 5 in FIG. 4. FIG. 6 is a sectional view taken along the line 6-6 in FIG.
5 Throttle body 10 Intake path 11 Throttle valve 17 Throttle sensor 18 Intake path temperature sensor 19 Sensor unit 20 Unit housing 26, circuit board 33, hollow cylindrical body 33a, closed end 35 of hollow cylindrical body, sensor element (thermistor)
37 ··· Coupler 38, 39 ··· Coupler connection terminal A ····································· Throttle body device

Claims (5)

A throttle body (5) having a throttle valve (11) for opening and closing the intake passage (10); a throttle sensor (17) for electrically detecting the opening of the throttle valve (11); In the engine throttle body device equipped with an intake air temperature sensor (18) for electrically detecting the intake air temperature in
An engine characterized in that a sensor unit (19) is constructed by mounting a throttle sensor (17) and an intake air temperature sensor (18) in a common unit housing (20) screwed to a throttle body (5). Throttle body device. The throttle body device for an engine according to claim 1,
The unit housing (20) is integrally formed with a hollow cylindrical body (33) that penetrates the side wall of the throttle body (5) and faces the closed end (33a) to the intake passage (10). A throttle body device for an engine, wherein an intake air temperature sensor (18) is housed in a cylindrical body (33) with a sensor element (35) closely attached to an inner surface of a tip portion (33a) thereof. The throttle body device for an engine according to claim 1 or 2,
The hollow cylindrical body (33) is placed on a plane (P) including the axis (A) of the intake passage (10) and the axis (B) of the throttle valve (11) on the axis (B) of the throttle valve (11). A throttle body device for an engine, wherein the throttle body device is arranged in parallel with the engine. The throttle body device for an engine according to any one of claims 1 to 3,
A throttle circuit for an engine, wherein a common circuit board (26) on which detection circuits respectively corresponding to a throttle sensor (17) and an intake air temperature sensor (18) are mounted is mounted in the unit housing (20). Body equipment. The throttle body device for an engine according to claim 4,
A single unit housing (20) having connection terminals (38, 39) electrically connected to a throttle sensor (17) and an intake air temperature sensor (18) via the circuit board (26). A throttle body device for an engine, wherein the coupler (37) is integrally formed.

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