JP4939472B2 - V-type engine throttle body assembly - Google Patents

Description

  The present invention relates to a throttle body assembly disposed between a first bank and a second bank, which are disposed offset from each other in the axial direction of a crankshaft in a V-type engine. The first and second throttle bodies that are offset to correspond to the offset between the two banks to be connected, and the first and second side surfaces along the offset direction of the first and second throttle bodies are connected to each other. The present invention relates to an improvement in a bag made up of a connecting plate and a second connecting plate that connects the other side surfaces of the first and second throttle bodies along the offset direction.

Conventionally, as a throttle body assembly for a V-type engine, one side surfaces of the first and second throttle bodies are connected to each other by a first connecting plate, and the other side surfaces are connected to each other by a second connecting plate. This is already known as disclosed in Patent Document 1 below.
JP 2001-115919 A

  In the throttle body assembly of the V-type engine described in Patent Document 1, the first and second throttle bodies are arranged without being offset in the axial direction of the crankshaft shaft. 2 Since one side surface portion and the other side surface portions of the throttle body are aligned with each other, two connecting plates parallel to the one side surface portion and the other side surface portion of the first and second throttle bodies are respectively provided. Fastening with a fastening member from the outside can be easily performed. However, in correspondence with the offset between the first and second banks along the axial direction of the crankshaft of the engine, the two first and second throttle bodies arranged parallel to the first and second throttle bodies are arranged offset. In order to connect the connecting plates by the above-described conventional method, among the one side surface portion and the other side surface portion of the first and second throttle bodies, the one side surface portion and the other side surface portion located inside in the offset direction are provided with the offset It is necessary to project a fastening boss so that it is aligned with one side surface portion and the other side surface portion that are located outside in the direction, which is not preferable because the throttle body assembly is increased in size.

  The present invention has been made in view of such circumstances, and connects the two connecting plates to the first and second throttle bodies while minimizing the overhang of the fastening bosses in the first and second throttle bodies. Accordingly, an object of the present invention is to provide a compact V-type engine throttle body assembly.

  In order to achieve the above object, the present invention provides a throttle body assembly disposed between first and second banks disposed offset from each other in the axial direction of a crankshaft in a V-type engine, First and second throttle bodies that are offset to correspond to the offset between the two banks to be connected to the first and second banks, respectively, and one of the first and second throttle bodies along the offset direction. In a throttle body assembly for a V-type engine, comprising: a first connecting plate that connects side portions; and a second connecting plate that connects the other side portions along the offset direction of the first and second throttle bodies. Among the one side surface portion and the other side surface portion of the first and second throttle bodies, the one side surface portion and the other side surface portion positioned outward in the offset direction include And an outward outward boss for fastening the second connecting plate from the inside with a fastening member, and the first and second connecting plates from the outside on the one side surface portion and the other side surface portion located inward in the offset direction, respectively. A first feature is that the inner bosses to be fastened by the inward fastening members are formed. The first and second connecting plates respectively correspond to a right connecting plate 4 and a left connecting plate 5 in an embodiment of the present invention described later, and the outward fastening member and the inward fastening member are outward fastening. It corresponds to the bolt 8 and the inward fastening bolt 9 respectively.

  In addition to the first feature, the present invention has a second feature in that the outer boss of each throttle body is protruded longer than the inner boss toward the other throttle body.

  Furthermore, in addition to the first or second feature, the present invention has a third feature in that the outer boss and the inner boss in each throttle body are offset from each other along the axial direction of each throttle body in a side view. To do.

  According to the first feature of the present invention, the first and second connecting plates can be connected to the first and second throttle bodies while minimizing the extension of the inner boss of each throttle body in the offset direction. This makes it possible to make the throttle body assembly compact. In addition, since the protrusion of the inner boss in the offset direction can be reduced, when each throttle body is molded by casting, the release property of the molded product becomes good, which can contribute to the improvement of productivity.

  According to the second feature of the present invention, the first and second connecting plates can be shortened by the amount by which the outer boss of each throttle body protrudes to the other throttle body longer than the inner boss. It is possible to contribute to strengthening the rigidity of the first and second connecting plates, and hence to the rigidity of the throttle body assembly, and to avoid interference with the inner boss of the tool when fastening to the outer boss. .

  According to the third feature of the present invention, when the connecting plate is fastened to the inner surface of the outer boss of each throttle body with the outward fastening member, a tool such as a box wrench to be used is interfered with the inner boss of the throttle body. Therefore, the outward fastening member can be easily tightened.

  Hereinafter, embodiments of the present invention will be described based on preferred examples shown in the accompanying drawings.

  FIG. 1 is a side view of a main part of a V-type engine of a motorcycle including a throttle body assembly according to the present invention, FIG. 2 is an enlarged view of the throttle body assembly in FIG. 1, and FIG. 4 is a view taken in the direction of arrow 4 in FIG. 3, FIG. 5 is a sectional view taken along line 5-5 in FIG. 3, and FIG. 6 is a side view showing a state immediately after the assembly of the throttle body assembly.

  First, in FIGS. 1 and 2, a V-type engine E mounted on a body frame F of a motorcycle includes a first bank B1 on the front side of the vehicle body and a second bank B2 on the rear side of the vehicle body. The second banks B1 and B2 are arranged such that their cylinder axes C1 and C2 open in a V shape around the crankshaft 1 that is horizontally arranged in the vehicle width direction of the motorcycle. In the following description, front / rear / left / right refers to the body of a motorcycle on which the V-type engine E is mounted.

  Between the first and second banks B1 and B2, there is a throttle body assembly TA formed by coupling the first and second throttle bodies T1 and T2 attached to the intake port openings 2 and 2 to each other. A common air cleaner 3 for filtering the intake air of the first and second throttle bodies T1, T2 is disposed above the common air cleaner 3. A valve shaft 11 a of a throttle valve 11 that opens and closes each intake passage 10 is rotatably supported in a posture parallel to the crankshaft 1 on the first and second throttle bodies T1 and T2.

  As shown in FIG. 3, the first and second throttle bodies T1, T2 are arranged with a certain distance e offset from each other in the axial direction of the crankshaft 1 in plan view. The offset e corresponds to the distance at which the first and second banks B1, B2 are offset from each other in the axial direction of the crankshaft 1. These first and second throttle bodies T1 and T2 are connected to each other via right and left connecting plates 4 and 5 to constitute a throttle body assembly TA.

  A connection structure of the right and left connection plates 4 and 5 to the first and second throttle bodies T1 and T2 will be described with reference to FIGS.

  In this embodiment, as shown in FIG. 3, the first throttle body T1 is offset to the right with respect to the second throttle body T2. Therefore, the right side surface of the first throttle body T1 is the second throttle body. The left side surface of the second throttle body T2 is located on the outer side in the offset e direction from the left side surface of the first throttle body T1.

  Therefore, as shown in FIGS. 3, 4 and 6, a pair of upper and lower outer bosses 6 are formed integrally on the right side surface of the first throttle body T1 so that the right connecting plate 4 overlaps the inner side surface. A single inner boss 7 is formed on the right side surface of the throttle body T2 so that the right connecting plate 4 overlaps the outer surface. The inner surface of the outer boss 6 and the outer surface of the inner boss 7 are connected to the right connecting plate 4. Are arranged in parallel with each other with a distance corresponding to the plate thickness in the direction of the offset e.

  As shown in FIGS. 2, 3 and 6, a pair of upper and lower outer bosses 6 are integrally formed on the left side surface of the second throttle body T2 so that the left connecting plate 5 overlaps the inner side surface. On the left side of the body T1, a pair of upper and lower inner bosses 7 are formed to overlap the left connecting plate 5 on the outer side. Also in this case, the inner side surface of the outer boss 6 and the outer surface of the inner boss 7 are formed so as to be parallel to each other with a distance corresponding to the thickness of the left connecting plate 4 in the offset e direction. All the outer bosses 6 and the inner bosses 7 are provided with screw holes.

  Thus, on the right side of the first and second throttle bodies T 1, T 2, the right connecting plate 4 is superimposed on the inner surface of the outer boss 6 and the outer surface of the inner boss 7. The right connecting plate 4 is fastened to the outer boss 6 by screwing an outward fastening bolt 8 penetrating from the inside into the screw hole of the outer boss 6, and is inwardly penetrating the right connecting plate 4 from the outer side. The fastening bolt 9 is fastened to the inner boss 7 by screwing into the screw hole of the inner boss 7.

  On the left side of the first and second throttle bodies T1 and T2, the left connecting plate 5 is overlapped with the inner side surface of the outer boss 6 and the outer side surface of the inner boss 7. The left connecting plate 5 is fastened to the outer boss 6 by screwing outward fastening bolts 8 penetrating from the inside into the screw holes of the outer boss 6, and inward penetrating the left connecting plate 5 from the outer side. The fastening bolt 9 is fastened to the inner boss 7 by screwing into the screw hole of the inner boss 7.

  In the above, the outer boss 6 in each throttle body T1, T2 is formed so as to protrude longer than the inner boss 7 toward the other throttle body. Further, the outer boss 6 and the inner boss 7 in each throttle body T1, T2 are offset from each other along the axis direction of each throttle body T1, T2, that is, the axis direction of each intake passage 10 in a side view.

  Thus, when assembling the throttle body assembly TA, first, for example, the right connecting plate 4 is fastened to the outer boss 6 of the first throttle body T1 by the outward fastening bolts 8 and the inner side of the second throttle body T2. The boss 7 is fastened with an inward fastening bolt 9. By the way, since the outer boss 6 and the inner boss 7 of each throttle body T1, T2 are offset from each other along the axial direction of the intake passage 10 in a side view, the outward fastening bolt 8 is tightened with a box wrench. In operation, the box wrench does not interfere with the left inner boss 7 of the first throttle body T1, and therefore, the operation of tightening the outward fastening bolt 8 can be easily performed.

  Next, in the same manner, the left connecting plate 5 is fastened to the outer boss 6 of the second throttle body T2 by the outward fastening bolt 8, and the inner boss 7 of the first throttle body T1 is fastened by the inward fastening bolt 9. Conclude.

  Thus, of the right and left side portions of the first and second throttle bodies T1 and T2, the right side surface portion of the first throttle body T1 and the left side surface portion of the second throttle body T2 that are located outward in the offset e direction. The outer boss 6 for fastening the right and left connecting plates 4 and 5 from the inside with the outward fastening bolts 8 respectively, and the right side surface portion of the second throttle body T2 and the first throttle body positioned inward in the offset e direction Since the inner bosses 7 for fastening the first and second connecting plates 4 and 5 with the inward fastening bolts 9 from the outside are formed on the left side surface portion of the T1, respectively, the inner bosses 7 of the throttle bodies T1 and T2 are First and second throttle bodies with the right and left connecting plates 4 and 5 being parallel to each other while minimizing overhang in the offset e direction Can be linked to 1, T2, can be made compact the throttle body assembly TA. Further, since the protrusion of the inner boss 7 in the direction of the offset e can be reduced, when the throttle bodies T1 and T2 are molded by casting, the mold releasability is improved and the productivity is improved. obtain.

  On the other hand, since the outer boss 6 of each throttle body T1, T2 is longer than the inner boss 7 and protrudes toward the other throttle body, the right and left connecting plates 4 and 5 are shortened in the front-rear direction by that amount. Thus, the rigidity of the right and left connecting plates 4 and 5 can be enhanced, and the rigidity of the throttle body assembly TA can be enhanced.

  3 and 4 again, after the throttle body assembly TA is assembled, the valve shaft 11a of the throttle valve 11 of one of the first and second throttle bodies T1, T2 (in the illustrated example, the valve shaft on the first throttle body T1 side). A throttle drum 12 is fixed to 11a), and an opening operation wire 13 and a closing operation wire 14 are connected to the throttle drum 12. By alternately pulling these wires by reciprocating rotation of the accelerator grip of the motorcycle, the throttle drum 12 can be rotated in the opening / closing direction of the throttle valve 11.

  The rotation of the throttle drum 12 is transmitted to the other valve shaft 11a through the interlocking mechanism 15. This interlocking mechanism includes a first throttle lever 16 rotatably supported on the other valve shaft 11a (the valve shaft 11a on the second throttle body T2 side in the illustrated example), and the same mechanism adjacent to the first throttle lever 16. The second throttle lever 17 fixed to the valve shaft 11a, the link 18 connecting the throttle drum 12 and the first throttle lever 16, the first and second throttle levers 16 and 17, and the both throttle levers 16 are connected. , 17 and a tuning screw 19 capable of adjusting the mutual phase. Thus, the mutual adjustment of the phase between the first and second throttle levers 16 and 17 can synchronize the throttle valves 11 and 11 of the first and second throttle bodies T1 and T2.

  In FIGS. 3 and 5, electromagnetic first and second fuel injection valves I1 and I2 are mounted on the first and second throttle bodies T1 and T2 on the sides facing each other. The injection valves I1 and I2 inject fuel toward the downstream side of the corresponding intake passages 10 and 10, respectively. A fuel distribution pipe D for distributing fuel from a common fuel supply system 20 is connected to the first and second fuel injection valves I1 and I2.

  As clearly shown in FIG. 5, the fuel distribution pipe D is composed of first and second distribution pipes 221 and 222 that are individually molded from synthetic resin and separated from each other. The first distribution pipe 221 includes a first connection cap 241 fitted in a liquid-tight manner on the outer periphery of the fuel inlet cylinder portion 30 of the first fuel injection valve I1 via a seal member 29, and a bottomed cylindrical first connection cylinder. 251 and a pair of first fastening bosses 261 are integrally formed, and the joint pipe 23, the first connection cap 241 and the first connection cylinder 251 communicate with each other inside.

  In addition, the second distribution pipe 222 is liquid-tightly fitted to the outer circumference of the joint pipe 23 enabling the connection of the common fuel supply system 20 and the fuel inlet cylinder portion 30 of the second fuel injection valve I2 through the seal member 29. A second connection cap 242 to be mounted, a bottomed cylindrical second connection cylinder 252 and a pair of second fastening bosses 262 are integrally formed, and the second connection cap 242 and the second connection cylinder 252 are integrally formed. Communicates with each other inside. The joint pipe 23 can also be formed on the first distribution pipe 221 side.

  The first and second fastening bosses 261 and 262 are first screwed by screwing bolts 27 passing through the respective bolt holes 26a into screw holes 28 provided at predetermined positions of the first and first throttle bodies T1. And the second throttle bodies T1 and T2. The seal member 29 is mounted in the outer peripheral groove 31 of the fuel inlet cylinder 30 of each fuel injection valve I1, I2. At this time, the right connecting plate 4 is disposed adjacent to the first distribution pipe 221 and the left connecting plate 4 is disposed adjacent to the second distribution pipe 222, whereby the throttle body assembly TA can be made compact.

  The first and second connecting cylinders 251 and 252 are arranged coaxially so that the opening portions are opposed to each other, and free end portions of the communication pipe 33 are loosely fitted to both the connecting cylinders 251 and 252. Elastic seal members 34 and 34 (for example, O-rings) that are in close contact with the inner peripheral surfaces of the corresponding connecting cylinders 251 and 252 are attached to the annular grooves 35 and 35 on the outer periphery of both ends of the communication pipe 33. Thus, the communication pipe 33 and the elastic seal members 34, 34 constitute a communication means 36 that allows the first and second distribution pipes 221, 222 to communicate with each other and absorbs a positional shift therebetween.

  The interlocking mechanism 15 and the fuel distribution pipe D are all attached after the throttle body assembly TA is assembled.

  As mentioned above, although the Example of this invention was described, this invention is not limited to the said Example, A various design change can be performed in the range which does not deviate from the summary of this invention. For example, the number of outer bosses 6 and inner bosses 7 is arbitrary. Therefore, the shapes of the right and left connecting plates 4 and 5 connected to them are arbitrary such as a triangle and a quadrangle.

1 is a side view of a main part of a V-type engine of a motorcycle including a throttle body assembly according to the present invention. The enlarged view of the throttle body assembly in FIG. FIG. FIG. 4 is a view taken in the direction of arrow 4 in FIG. 3. FIG. 5 is a sectional view taken along line 5-5 of FIG. The side view which shows the state immediately after the assembly of the said throttle body assembly.

Explanation of symbols

E ··· V engine B1, B2 ··· First and second banks e ··· Offset 1 ··· Crankshaft 4 ··· First connecting plate (Right connecting plate)
5 ······ 2nd connecting plate (left connecting plate)
6 ··· Outer boss 7 ··· Inner boss 8 ··· Outward fastening member (outward fastening bolt)
9 ... Inward fastening member (Inward fastening bolt)
10: Intake passage

Claims (3)

Throttle body assembly (TA) arranged between first and second banks (B1, B2) arranged offset (e) in the axial direction of crankshaft (1) in V-type engine (E) The first and second throttles are offset to correspond to the offset (e) between the banks (B1, B2) to be connected to the first and second banks (B1, B2), respectively. A first connecting plate (4) for connecting the body (T1, T2) and one side surface portion of the first and second throttle bodies (T1, T2) along the offset (e) direction; In a throttle body assembly for a V-type engine, comprising a second connecting plate (5) for connecting the other side surfaces along the offset (e) direction of the second throttle body (T1, T2).
Of the one side surface portion and the other side surface portion of the first and second throttle bodies (T1, T2), the one side surface portion and the other side surface portion positioned outward in the offset (e) direction are connected to the first and second connection portions. An outer boss (6) for fastening the plates (4, 5) from the inside with an outward fastening member (8) is provided on one side surface and the other side surface located inward in the offset (e) direction. A throttle body assembly for a V-type engine, wherein inner bosses (7) are formed to fasten the first and second connecting plates (4, 5) from the outside with inward fastening members (9). The throttle body assembly for a V-type engine according to claim 1,
A throttle body assembly for a V-type engine, characterized in that an outer boss (6) in each throttle body (T1, T2) protrudes toward the other throttle body longer than an inner boss (7). The throttle body assembly for a V-type engine according to claim 1 or 2,
The outer boss (6) and the inner boss (7) of each throttle body (T1, T2) in a side view are offset from each other along the axial direction of each throttle body (T1, T2). V-type engine throttle body assembly.

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