JP6125297B2 - Throttle body assembly with bypass controller - Google Patents

Description

  The present invention rotatably supports a valve shaft of a throttle valve on a throttle body having an intake passage that is opened and closed by a throttle valve, and a throttle drum operated by a driver is connected to one end of the valve shaft, A throttle body assembly in which a throttle sensor for detecting a rotation angle of the other end of the valve shaft as a throttle valve opening is attached to a throttle body, wherein the bypass bypasses the throttle valve and is connected to an intake passage. A valve guide hole interposed in the bypass, a control valve that is slidably and non-rotatably fitted in the valve guide hole, and opens and closes the bypass, and an electric motor disposed coaxially with the control valve, It comprises a screw mechanism that converts the rotation of the output shaft of the electric motor into axial movement and transmits it to the control valve. Those comprising a bypass controller ゝ relates to an improvement.

  Such a throttle body assembly with a bypass control device is already known as disclosed in Patent Document 1 below.

JP 2007-332829 A

  In a conventional throttle body assembly with a bypass control device, the bypass and valve guide holes are all formed in the throttle body. By assembling the control valve, screw mechanism, and electric motor sequentially, it cannot be said that the assemblability is good. Further, in order to lengthen the downstream passage of the bypass and prevent foreign matter from entering the valve hole by the blown-back gas, it is necessary to enlarge the throttle body in the axial direction of the intake passage, so it is difficult to reduce the size of the throttle body.

  The present invention has been made in view of such circumstances, and the bypass control device can be formed and assembled separately from the throttle body assembly so that it is easy to form and assemble, and is compact. An object of the present invention is to provide a throttle body assembly with a bypass control device.

In order to achieve the above object, the present invention provides a throttle body having an intake passage that is opened and closed by a throttle valve, rotatably supporting the valve shaft of the throttle valve, and is operated by an operator at one end of the valve shaft. A throttle body assembly, wherein a throttle sensor is connected to the throttle body for detecting the rotation angle of the other end of the valve shaft as the opening of the throttle valve, and bypasses the throttle valve. A bypass connected to the intake passage, a valve guide hole interposed in the bypass, a control valve which is slidably and non-rotatably fitted in the valve guide hole, and opens and closes the bypass, and is coaxial with the control valve And the rotation of the output shaft of the electric motor is converted into axial movement to the control valve. In a device including a bypass control device including a reaching screw mechanism, a separate control base is joined to an attachment surface formed on one side of the throttle body between the throttle drum and the throttle sensor, and the attachment surface is attached to the attachment surface. A first communication groove connected to the downstream end of the bypass upstream passage and a second communication groove connected to the upstream end of the bypass downstream passage, the control base body including the valve guide hole and the first communication groove an inlet hole communicating the communication groove in the valve guide hole, and said second communicating grooves form a metering hole is opened and closed by the control valve communicates with the said valve guide hole, this measuring bore, said downstream passageway, and a downstream end which opens into the intake passage along the axis of the intake passage disposed offset from each other, and is bent therebetween middle passage, the downstream end, slot The first, wherein the intake pipe of Rubodi engine is longitudinal grooves formed in the joining end face to be joined.

Further, in addition to the first feature, the second feature of the present invention is that the second communication groove and the vertical groove communicate with each other through a hole that is connected at an angle .

According to the present invention, in addition to the second feature, the hole is bent at a right angle from the downstream end of the second communication groove and extends toward the intake passage, and a horizontal hole bent from the downstream end of the vertical hole. and third, comprising the a.

The present invention, in addition to the third feature, the vertical hole, in a plan view of the throttle body as viewed from the mounting surface side, a fourth feature in that arranged so as to overlap with the valve shaft.

According to the first aspect of the present invention, a separate control base is joined to the attachment surface formed on one side of the throttle body between the throttle drum and the throttle sensor, and the bypass surface is connected to the attachment surface. A first communication groove connected to the downstream end of the upstream passage and a second communication groove connected to the upstream end of the downstream downstream passage are formed. The control base includes the valve guide hole and the first communication groove. an inlet hole communicating with the valve guide hole, the so a second communicating groove to form a metering hole is opened and closed by the control valve communicates with the said valve guide hole, the throttle body and the control body to divide the bypass In addition to the throttle body assembly, a control valve, a screw mechanism, and an electric motor are incorporated into the control base body. By configuring the bypass control device, it becomes possible to assemble the throttle body assembly and the bypass control device in parallel, and after assembling them, combining both to complete the assembly, Assemblability is improved and assembly efficiency is increased. Moreover bypass control device, would be positioned between the throttle drum and the throttle sensor, the amount of projection from the throttle body assembly of the bypass control device is suppressed as small as possible, compact the throttle body assembly with a bypass control device Can be achieved. Furthermore, in the bypass, and the measurement hole, the downstream passage and a downstream end which opens into the intake passage along the axis of the intake passage disposed offset from each other, and octopus is bent therebetween middle passage Even when engine blowback gas enters the vertical groove vigorously and flows backward in the downstream passage, the blowback gas passes through a long flow path and reaches the turning hole until it reaches the metering hole. The foreign matter such as soot that is attenuated in the direction perpendicular to the axis of the measuring hole and travels in the minor axis direction of the measuring hole is difficult to enter the measuring hole. Thus, it is possible to prevent problems such as clogging of the measuring hole due to the foreign matter and floating of the control valve that may occur when the foreign matter enters the measuring hole. In addition, since foreign matters such as eaves do not easily enter the measuring hole, a long flow path to reach the measuring hole is not necessary, and the downstream side of the throttle body can be made compact.

According to the third aspect of the present invention, the engine blow-back gas that flows backward in the downstream passage collides with a plurality of corners while passing through a longer flow path without increasing the throttle body before reaching the metering hole. By doing so, the energy is effectively attenuated, and the clogging of the measuring hole due to foreign matters such as soot contained in the blown-back gas and problems due to the foreign matters can be prevented.

According to the fourth feature of the present invention, the vertical hole is arranged so as to overlap the valve shaft in a plan view of the throttle body as viewed from the mounting surface side. By arranging the valve shaft, the distance between the joint end surface to which the intake pipe of the engine is joined and the throttle valve is reduced, so that the installation space for the intake pipe is increased between the engine and the throttle valve. The intake pipe layout is improved.

The rear view of the throttle body assembly with a bypass intake control device concerning the embodiment of the present invention. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. FIG. 4 is a sectional view taken along line 4-4 of FIG.

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

  First, in FIGS. 1 to 3, reference numeral 1 is a throttle body connected to an intake pipe 35 of an engine for a motorcycle, for example, and has an intake passage 2 communicating with the inside of the intake pipe 35 at the center. A valve shaft 3 a of a butterfly throttle valve 3 that opens and closes the intake passage 2 is rotatably supported by the throttle body 1. A throttle drum 4 that is operated by a driver via a throttle wire is fixed to one end of the valve shaft 3a, and a throttle sensor that detects the rotation of the other end of the valve shaft 3a as the opening of the throttle valve 3. 9 is attached to the throttle body 1. The throttle body assembly A is configured as described above.

  A mounting surface 1a parallel to the axis X of the intake passage 2 is formed on one side of the throttle body 1 between the throttle drum 4 and the throttle sensor 9, and the control base 5 of the bypass control device B is formed on the mounting surface 1a. They are stacked and fastened by a plurality of bolts 6 in the illustrated example. The throttle body 1 is made of a light alloy, and the control base 5 is made of a synthetic resin.

  A bypass 13 that bypasses the throttle valve 3 and is connected to the intake passage 2 is formed from the throttle body 1 to the control base 5, and the configuration of the bypass 13 will be described below.

  The throttle body 1 is formed with an upstream passage 14 having an upstream end opened in the intake passage 2 upstream from the throttle valve 3 and a downstream passage 15 having a downstream end opened in the intake passage 2 downstream from the throttle valve 3. In addition, a first communication groove 16 that is continuous with the downstream end of the upstream passage 14 and a second communication groove 17 that is continuous with the upstream end of the downstream passage 15 are formed on the mounting surface 1 a. An O-ring 23 surrounding each of the first and second communication grooves 16 and 17 is attached to the attachment surface 1 a so as to be in close contact with the joint surface of the control base 5.

Further, as clearly shown in FIG. 2, the downstream passage 15 has a vertical hole 15a that is bent at a right angle below the downstream end of the second communication groove 17 and extends to the intake passage 2 side, and a downstream end of the vertical hole 15a. a horizontal hole 15b to more bent at a right angle to the horizontal direction, extends orthogonally downward from the downstream end of the horizontal hole 15b is composed of a longitudinal groove 15c to reach the intake passage 2, vertical grooves 15c of that is, the throttle body 1 Formed on the joining end face 1b to which the intake pipe 35 of the engine is joined. An O-ring 24 surrounding the intake passage 2 and the vertical groove 15c is attached to the joint end surface 1b so as to be in close contact with the joint end surface of the intake pipe 35.

  On the other hand, the control base 5 has a rectangular cross-section valve guide hole 7 with its own axis Y directed in a direction orthogonal to the axis X of the intake passage 2, and an inflow that communicates the first communication groove 16 with the valve guide hole 7. A hole 11 and a measuring hole 10 communicating with the second communication groove 17 in the valve guide hole 7 are formed. Thus, the bypass 13 includes the upstream passage 14, the first communication groove 16, the inflow hole 11, the valve guide hole 7, the second communication groove 17, and the downstream passage 15 (vertical hole 15a, horizontal hole 15b, and vertical groove 15c). The

  The measuring hole 10 has a long hole shape whose long diameter is directed in the direction of the axis Y of the valve guide hole 7. Between the fully open position A and the fully closed position B to open and close the measuring hole 10 (the upper half of FIG. 3). The control valve 12 that moves through the valve guide hole 7 is slidably fitted in the valve guide hole 7.

  Thus, the metering hole 10 opened and closed by the control valve 12 and the downstream end portion of the bypass 13 opened to the intake passage 2, that is, the longitudinal groove 15 c are arranged with an offset S from each other along the axis X of the intake passage 2. The intermediate path between them is formed to be bent. Further, the vertical hole 15a in the intermediate portion of the downstream passage 15 is arranged so as to overlap the valve shaft 3a in a plan view of the throttle body 1 as viewed from the mounting surface 1a side of the throttle body 1.

The control valve 12 has a control wall 12a slidably brought into contact with the control inner side surface 8a of the valve guide hole 7 with the lower side surface as the control outer side surface 8b, and rises from both left and right ends of the control wall 12a. A pair of side walls 12b, 12b facing both the left and right inner surfaces; a front end wall 12c that stands up from the front end of the control wall 12a on the bottom side of the valve guide hole 7 and connects between the front end portions of the side walls 12b, 12b; control wall 12a and the rear end of both side walls 12 b, 12 b have been more and inward flange 12d protruding inward, the control wall 12a and the opposite surface at an a box-shaped and open surface 12e Therefore, the control valve 12 is slidable in the axial direction in the valve guide hole 7 having a rectangular cross section, but cannot rotate.

  Further, the control base 5 is provided with a motor mounting hole 19 having a diameter larger than that of the valve guide hole 7, which is connected to the opening end of the valve guide hole 7 via a step portion 18, and a stator 20 a of the electric motor 20 is mounted on the control base 5. The At that time, a seal member 21 made of an elastic material such as rubber is sandwiched between the front end surface of the stator 20a and the step portion 18 and is in close contact with the outer peripheral surface of the output shaft 20b of the electric motor 20. The output shaft 20b of the electric motor 20 can be rotated forward and backward, and the control valve 12 is connected to the output shaft 20b via a screw mechanism 25.

  The screw mechanism 25 is connected to the control valve 12 through a detent means and is connected to a slide piece 27 that synchronously opens and closes the control valve 12 and an output shaft 20b of the electric motor 20, and is controlled by the slide piece 27. The screw shaft 29 is screwed into a screw hole 28 provided along the sliding direction of the valve 12. The screw hole 28 is formed in a bag shape having a dead end portion 28a. The slide piece 27 is formed on the outer periphery of a cylindrical shaft 27a that passes through the U-shaped inward flange 12d of the control valve 12 and is disposed in the control valve 12, and a closed end wall 27b at the front end of the cylindrical shaft 27a. The cylindrical shaft 27a is provided with a bag-like screw hole 28 into which the screw shaft 29 is screwed.

  A coil spring 33 is contracted between the outward flange 27c and the inward flange 12d. Due to the set load of the coil spring 33, the control valve 12 moves rearward with respect to the slide piece 27, that is, toward the electric motor 20 side. As a result, the front end wall 12c of the slide piece 27 is held in contact with the outward flange 27c. Thereby, the slide piece 27 and the control valve 12 are connected to each other without backlash in the axial direction.

  Thus, the axis Y of the valve guide hole 7 becomes the common axis Y of the control valve 12, the electric motor 20 and the screw mechanism 25, and extends in a direction perpendicular to the axis X of the intake passage 2.

  The detent means includes a key groove 36 formed on the outer end surface of the closed end wall 27b of the slide piece 27 and a key that projects from the inner end surface of the front end wall 12c of the control valve 12 and engages with the key groove 36. 37, and the engagement between the key groove 36 and the key 37 prevents the slide piece 27 and the control valve 12 from rotating relative to each other. The bypass control device B is configured as described above.

  Next, the operation of this embodiment will be described.

  When the throttle valve 3 is fully closed, an electronic control unit (not shown) starts up the engine based on information on the engine operating conditions such as the throttle valve opening, the engine intake negative pressure, the intake air temperature, the engine temperature, and the engine speed. In order to obtain the optimum opening degree of the control valve 12 corresponding to the engine operating conditions, such as during fast idling, normal idling, and engine braking, the power supply to the electric motor 20 is controlled to output the output shaft 20b of the electric motor 20 Is rotated forward or reverse. When the output shaft 20b rotates or reversely rotates, the rotation is transmitted to the control valve 12 as an axial displacement through the slide piece 27 while being decelerated by the screw mechanism 25. Therefore, the control valve 12 has a measuring hole due to the axial displacement. The opening area to ten valve guide holes 7 can be finely adjusted. Thereby, the intake air amount of the engine flowing through the bypass 13 is finely controlled, and it is possible to cope with engine starting, fast idling, normal idling, engine braking, and the like.

  In particular, the metering hole 10 opened and closed by the control valve 12 has a long hole shape with a long diameter in the sliding direction of the control valve 12, so that the effective opening area is finely adjusted according to the sliding of the control valve 12. Can be adjusted.

  In this case, the pressing force to the control inner surface 8a side due to gravity and the suction force due to the negative intake pressure of the engine acting on the control outer surface 8b of the control valve 12 from the measuring hole 10 simultaneously act on the control valve 12, By these, the contact | adhesion power between the control outer side surface 8b and the control inner side surface 8a is strengthened.

  If the throttle valve 3 is opened, an amount of intake air corresponding to the opening degree is supplied to the engine through the intake passage 2, and the engine moves to the output operation range.

  In such a bypass control device B of the throttle body assembly A, a separate control base body 5 is joined to the attachment surface 1a of the throttle body 1 provided between the throttle drum 4 and the throttle sensor 9, and the attachment surface 1a. Are formed with a first communication groove 16 connected to the downstream end of the upstream passage 14 of the bypass 13 and a second communication groove 17 connected to the upstream end of the downstream passage 15 of the bypass 13. A guide hole 7, an inflow hole 11 that communicates the first communication groove 16 with the valve guide hole 7, and a measurement hole 10 that communicates the second communication groove 17 with the valve guide hole 7 and is opened and closed by the control valve 12 are formed. The valve guide hole 7, the control valve 12 and the electric motor 20 are provided with their common axis Y oriented in a direction perpendicular to the axis X of the intake passage 2, and the measuring hole 1. Is formed in the shape of a long hole whose major axis is directed in the direction of the common axis Y, the bypass 13 is divided and processed into the throttle body 1 and the control base 5, and the processing can be easily performed. The control base body 5 includes the control valve 12, the screw mechanism 25, and the electric motor 20 separately from the throttle body assembly A to constitute the bypass control device B. Therefore, the throttle body assembly A and the bypass control device B Assembling can be performed in parallel, and after assembling them, they are combined to complete the assembly, so that the assembling property is improved and the assembling efficiency is improved. Moreover, since the bypass control device B is disposed between the throttle drum 4 and the throttle sensor 9, the amount of overhang of the bypass control device B from the throttle body assembly A is suppressed as much as possible, and the bypass control device B is provided. The throttle body assembly A can be made compact.

  Further, in the bypass 13, the measuring hole 10 and the vertical groove 15 c are arranged with an offset S from each other along the axis X of the intake passage 2, and the downstream passage 15 connecting therebetween is perpendicular to the downstream end of the second communication groove 17. A vertical hole 15a that is bent and extends toward the intake passage 2, a horizontal hole 15b that is bent from the downstream end of the vertical hole 15a, and a vertical groove 15c that is bent from the downstream end of the horizontal hole 15b and opens into the intake passage 2. For example, when the throttle valve 3 is closed and the engine is decelerated, even if the engine blowback gas enters the vertical groove 15c and flows backward in the downstream passage 15, the blowback gas remains Before reaching the measuring hole 10, energy is effectively attenuated by colliding with a plurality of bending angles while passing through a long flow path, and further proceeding in the minor axis direction of the measuring hole 10 perpendicular to the axis of the measuring hole 10. soot Foreign matter is unlikely to enter the measurement hole 10, and as a result, foreign matters such as soot contained in the blown-back gas are separated in the middle, and the measurement hole 10 is clogged by the foreign matter or the foreign matter enters the measurement hole 10. Thus, problems such as floating of the control valve 12 that can occur can be prevented. In addition, since foreign matters such as eaves hardly enter the measuring hole 10, a long flow path to reach the measuring hole 10 is not necessary, and the downstream side of the throttle body 1 can be made compact.

  Further, the vertical hole 15a in the intermediate portion of the downstream passage 15 is disposed so as to overlap the valve shaft 3a in a plan view of the throttle body 1 as viewed from the mounting surface 1a side of the throttle body 1, and therefore, in the throttle body 1, By disposing the valve shaft 3a so as to overlap the hole 15a, the distance between the joint end surface to which the engine intake pipe 35 is joined and the throttle valve 3 is reduced. Therefore, between the engine and the throttle valve 3, The installation space for the intake pipe is increased, and the layout of the intake pipe is improved.

  The present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention.

A ··· Throttle body assembly B ··· Bypass control device S ··· Offset X ···································· Motor common axis 1 ... throttle body 1a ... mounting surface 2 ... intake passage 3 ... throttle valve 3a ... valve shaft 4 ... throttle drum 5 ... Control base 7 ... Valve guide hole 10 ... Metering hole 11 ... Inflow hole 12 ... Control valve 13 ... Bypass 14 ... On Flow passage 15 ... Downstream passage 15a ... Vertical hole 15b ... Horizontal hole 15c ... Vertical groove 16 ... First communication groove 17 ... Second communication groove 20 ... Electric motor 20b ... output shaft 25 ... screw mechanism 35 ... intake pipe

Claims (4)

A valve shaft (3a) of the throttle valve (3) is rotatably supported on a throttle body (1) having an intake passage (2) opened and closed by the throttle valve (3), and one end portion of the valve shaft (3a). Further, a throttle sensor (9) is connected to a throttle drum (4) operated by a driver and detects the rotation angle of the other end of the valve shaft (3a) as an opening of the throttle valve (3). A throttle body assembly attached to (1), wherein a bypass (13) bypassing the throttle valve (3) and connected to the intake passage (2), and a valve guide hole interposed in the bypass (13) (7), a control valve (12) that is slidably and non-rotatably fitted in the valve guide hole (7) to open and close the bypass (13), and the control valve (12) An electric motor (20) arranged coaxially, and a screw mechanism (25) for converting the rotation of the output shaft (20b) of the electric motor (20) into axial movement and transmitting it to the control valve (12). In what comprises a bypass control device comprising:
A separate control base (5) is joined to a mounting surface (1a) formed on one side of the throttle body (1) between the throttle drum (4) and the throttle sensor (9), and the mounting surface ( 1a) includes a first communication groove (16) connected to the downstream end of the upstream passage (14) of the bypass (13) and a second communication groove (connected to the upstream end of the downstream passage (15) of the bypass (13) ( 17), and the control base (5) includes the valve guide hole (7), and the inflow hole (11) communicating the first communication groove (16) with the valve guide hole (7). the second communicating groove (17) to form a measuring bore (10) which is opened and closed by the control valve (12) communicated with said the valve guide hole (7), wherein the this measuring bore (10) A downstream end opening to the intake passage (2) of the downstream passage (15) And arranged offset (S) with one another along the axis (X) of the airways (2), and is bent therebetween middle passage, the downstream end portion, an intake pipe of the engine of the throttle body (1) ( 35) A throttle body assembly with a bypass control device, characterized in that it is a longitudinal groove (15c) formed in a joining end face (1b) to which 35) is joined . The throttle body assembly with a bypass control device according to claim 1,
The second communication groove (17) and the vertical groove (15c) communicate with each other by holes (15a, 15b) that are connected at an angle to each other, and a throttle with a bypass control device Body assembly. The throttle body assembly with a bypass control device according to claim 2 ,
The holes (15a, 15b) are bent at a right angle from the downstream end of the second communication groove (17) and extend toward the intake passage (2), and from the downstream end of the vertical hole (15a). A throttle body assembly with a bypass control device, characterized by comprising a lateral hole (15b) that bends. The throttle body assembly with a bypass control device according to claim 3 ,
With a bypass control device, wherein the vertical hole (15a) is arranged so as to overlap the valve shaft (3a) in a plan view of the throttle body (1) viewed from the mounting surface (1a) side Throttle body assembly.

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