JP5288335B2 - Waterproof structure of the throttle device - Google Patents

Description

  The present invention relates to a waterproof structure for a throttle device, and more particularly to a waterproof structure for a throttle device that prevents water droplets from entering the throttle body.

As shown in FIGS. 6 and 7, a throttle device 114 attached to the engine 106 is disposed in the engine room 104 of the vehicle formed by the dash panel 103. The throttle device 114 includes a throttle body 113. The throttle body 113 is fixed to the body mounting portion 115 of the intake manifold 109 by a plurality of mounting bolts 116. In addition, a valve bracket 118 to which a control valve (VSV) 117 is attached is fixed to the intake manifold 109 together with the throttle body 113 by an attachment bolt 116.
The throttle body 113 has an intake passage 119 through which air flows from above to below the vehicle. A cylindrical portion 121 that connects the downstream end of the intake hose 120 is provided on the upper portion of the throttle body 113. The downstream end of the intake hose 120 is fastened to the cylindrical portion 121 by a throttle body side clamp 122. The upstream end of the intake hose 120 is fastened to the hose connection portion 124 of the air cleaner 112 by an air cleaner side clamp 123.
Further, in the throttle body 113, a pedestal portion 126 in which the outer peripheral wall 125 of the intake passage 119 is thicker than the cylindrical portion 121 is provided below the cylindrical portion 121, and the throttle shaft 127 penetrates the pedestal portion 126. A through-hole 128 is formed toward the vehicle front-rear direction. The throttle shaft 127 includes a throttle valve 129.
A throttle lever 132 is fitted on the front side of the throttle shaft 127. A return spring 135 is disposed between the stepped portion 133 on the end surface of the throttle lever 132 and the annular front groove portion 134 on the front end surface of the pedestal portion 126. An accelerator cable 136 is connected to the throttle lever 132.
A throttle sensor 138 as an auxiliary device is connected to a rear end portion of the rear of the vehicle protruding from the through hole 128 of the throttle shaft 127. The throttle sensor 138 is covered with a rubber sensor cover 141. A joint surface 139 is formed between the pedestal 126 and the throttle sensor 138.
Between the throttle shaft 127 and the through hole 128, a front seal ring 157 on the front side and a rear seal ring 158 in the vicinity of the rear joint surface 139 are disposed in the axial direction.

Japanese Utility Model Publication 2-54338

  The throttle valve device according to Patent Document 1 is provided with waterproof and shielding means including a cover member that rotates together with a throttle shaft or rocks with a rocking member and shields the throttle sensor from the outside of the throttle body.

  However, conventionally, as shown in FIG. 7, when the vehicle travels on the submerged channel, the water hitting the dash panel 103 rebounds, and the water droplet hits the intake hose 120 and the valve mounting bracket 118 and flows downward (open arrow). Then, the water droplets accumulate on the upper surface of the pedestal portion 126 and in particular enter the inside of the throttle body 113 from the rear seal ring 158 via the joint surface 139 on the throttle sensor 138 side at the rear of the vehicle, For this reason, there is a disadvantage that the inside of the throttle body 113 is corroded.

  Accordingly, an object of the present invention is to provide a waterproof structure for a throttle device that improves the waterproof property of the throttle device without complicating the structure of the throttle device.

  According to the present invention, a cylindrical portion for connecting an intake hose is provided at an upper portion of a throttle body having an intake passage through which air flows downward from above the vehicle, and an outer peripheral wall of the intake passage is located below the cylindrical portion. In the waterproof structure of the throttle device, in which a thick pedestal portion is provided, a through hole through which the throttle shaft passes is formed in the pedestal portion, and an auxiliary machine is connected to an end portion of the throttle shaft protruding from the through hole. A plate-shaped waterproof cover provided with a cover portion that covers a joint surface between the pedestal portion and the auxiliary machine and has a hole portion through which the cylindrical portion passes is arranged at the outer periphery of the cylindrical portion. And

  The waterproof structure of the throttle device according to the present invention eliminates the need for newly adding a sealing part, prevents water droplets from entering the inside of the throttle body, and prevents parts inside the throttle body from corroding.

FIG. 1 is a cross-sectional view of the throttle device taken along line II of FIG. (Example) FIG. 2 is a perspective view of the waterproof cover. (Example) FIG. 3 is a perspective view of the throttle device. (Example) FIG. 4 is a plan view of the throttle device. (Example) FIG. 5 is a schematic plan view of the front portion of the vehicle. (Example) FIG. 6 is a plan view of a conventional throttle device. (Conventional example) 7 is a cross-sectional view of the throttle device taken along line VII-VII in FIG. (Conventional example)

  The present invention eliminates the need to add a new seal part, prevents water droplets from entering the inside of the throttle body, and corrodes the parts inside the throttle body. This is realized by arranging a plate-shaped waterproof cover provided in a part and provided with a cover portion covering the joint surface between the pedestal portion and the auxiliary machine on the outer periphery of the cylindrical portion.

1 to 5 show an embodiment of the present invention.
In FIG. 5, 1 is a vehicle, 2 is a body frame, 3 is a dash panel, and 4 is an engine room.
An engine 6 supported by a mount device 5 is mounted in the vehicle 1 in the engine room 4. The engine 6 is a so-called horizontal engine in which a crankshaft is disposed in the vehicle width direction (vehicle left-right direction).
The engine 6 is provided with an exhaust device 8 provided with an exhaust manifold 7 at the front, and an intake device 10 provided with an intake manifold 9 at the rear. Further, air that guides air from the front of the vehicle at the top. An air cleaner 12 having an introduction duct 11 is attached.

Further, the engine 6 is provided with a throttle device 14 having a throttle body 13.
The throttle body 13 is fixed to the throttle body mounting portion 15 of the intake manifold 9 by a plurality of mounting bolts 16. In addition, a valve bracket 18 to which a control valve (VSV) 17 is attached is fixed to the intake manifold 9 together with the throttle body 13 with an attachment bolt 16.
As shown in FIG. 1, the throttle body 13 has an intake passage 19 through which air flows from above to below the vehicle.
A cylindrical portion 21 that connects the downstream end of the intake hose 20 is provided on the upper portion of the throttle body 13. The downstream end of the intake hose 20 is fastened to the cylindrical portion 21 by a throttle body side hose clamp 22. The upstream end of the intake hose 20 is fastened to the hose connection portion 24 of the air cleaner 12 by an air cleaner side hose clamp 23.

Further, as shown in FIG. 1, in the throttle body 13, a pedestal portion 26 in which the outer peripheral wall 25 of the intake passage 19 is thicker than the cylindrical portion 21 is provided below the cylindrical portion 21. A through hole 28 through which the throttle shaft 27 passes is formed in the vehicle longitudinal direction. A throttle valve 29 is attached to the throttle shaft 27.
The throttle shaft 27 is rotatably supported by the pedestal portion 26 by a front needle bearing 30 in front of the vehicle with respect to the through hole 28 and a rear needle bearing 31 in the rear of the vehicle with respect to the through hole 28.
A throttle lever 32 is fitted on the front side of the throttle shaft 27. A return spring 35 is disposed between a step portion 33 on the end surface of the throttle lever 32 on the throttle body 13 side and an annular front groove portion 34 on the front end surface of the pedestal portion 26. As shown in FIGS. 3 and 4, an accelerator cable 36 is connected to the throttle lever 32.
Further, a connecting portion 37 is connected to a rear end portion of the rear side of the vehicle protruding from the through hole 28 of the throttle shaft 27, and a throttle sensor 38 as an auxiliary machine is connected to the connecting portion 37. The throttle sensor 38 is joined at a joint surface 39 with the rear surface of the pedestal portion 26 so as to accommodate the connecting portion 37 in the central recess 40 and is covered with a rubber sensor cover 41. The sensor cover 41 is fitted and attached to the rear protrusion 42 at the rear end of the pedestal portion 26.

A plate-shaped waterproof cover 43 is disposed on the outer periphery of the cylindrical portion 21 of the throttle body 13. As shown in FIGS. 1 to 4, the waterproof cover 43 is made of a substantially rectangular thin plate material, has a larger outline than the outer wall surface of the throttle body 13 in plan view, and is a hole through which the cylindrical portion 21 passes. A rear cover portion 45 that is a cover portion that covers the joint surface 39 between the pedestal portion 26 and the auxiliary throttle sensor 38 from above, and a front cover portion 46 on the throttle lever 32 side. , A rotation direction positioning recess 47 is provided at the left corner.
As shown in FIG. 1, the waterproof cover 43 has an inner peripheral portion 48 of the hole portion 44 disposed on the cover installation step portion 50 of the upper portion 49 of the pedestal portion 26 and an upper surface of the cover installation step portion 50. By being sandwiched between the upper end 51 of the intake hose 20 from above, it is fixed to the throttle body 13.
As shown in FIG. 1, the outer end surface 52 of the rear cover portion 45 of the waterproof cover 43 is disposed outward from the inner end surface 53 of the sensor cover 41 by a distance L1. Further, the outer end surface 54 of the front cover portion 46 of the waterproof cover 43 is formed to protrude forward from the front end surface 55 of the pedestal portion 26 by a distance L2. Therefore, a labyrinth structure 56 is formed in the throttle body 13 by the sensor cover 41 and the rear cover portion 45.
With such a structure, as shown in FIG. 1, water drops (indicated by arrows) that adhere to the outer peripheral surface of the intake hose 20 and flow downward due to their own weight are received by the rear cover portion 45 of the waterproof cover 43, and The water droplet can be dropped and discharged outside the rear surface of the vehicle from the joint surface 39 between the pedestal portion 26 and the throttle sensor 38 by the labyrinth structure 56 including the sensor cover 41 and the rear cover portion 45. Accordingly, it is possible to prevent water droplets from collecting on the upper surface of the pedestal portion 26 and entering the inside of the throttle body 13 from the joint surface 39 to corrode the internal components. Further, since there is no need to newly add a dedicated seal part to the joint surface 39 between the pedestal portion 26 and the throttle sensor 38, the structure of the throttle device 14 is simplified, resulting in an increase in cost, weight, and assembly. Increase in man-hours can be prevented.
Further, as shown in FIG. 1, the waterproof cover 43 is fixed to the throttle body 13 while being sandwiched between the axial end surface 51 of the intake hose 20 and the upper surface of the pedestal portion 26. Accordingly, the waterproof cover 43 can be attached to the throttle body 14 without using a dedicated mounting member such as a bracket or a bolt, and the structure of the throttle device 14 can be prevented from becoming complicated.

Further, a front seal ring 57 is disposed between the throttle shaft 27 and the through hole 28 in front of the front needle bearing 30 and the rear seal ring 58 behind the rear needle bearing 31. And a washer (C-ring) 60 that restricts axial movement of the packing 59 and the throttle shaft 27 between the rear seal ring 58 and the throttle sensor 38 on the rear end side in the axial direction of the throttle shaft 27. Is arranged.
Thereby, it is not necessary to newly add a sealing part to the joint surface 39 between the pedestal portion 26 and the throttle sensor 38, and the waterproof effect on the washer 60 that restricts the axial movement of the throttle shaft 27 can be improved.

  The waterproof structure of the throttle device according to the present invention can be applied to various engines.

DESCRIPTION OF SYMBOLS 1 Vehicle 3 Dash panel 4 Engine room 6 Engine 12 Air cleaner 13 Throttle body 14 Throttle device 19 Intake passage 20 Intake hose 21 Cylindrical portion 25 Outer wall 26 Base portion 27 Throttle shaft 28 Through hole 29 Throttle valve 32 Throttle lever 36 Accelerator cable 38 Throttle Sensor (auxiliary machine)
39 Joining surface 41 Sensor cover 43 Waterproof cover 44 Hole 45 Rear cover (cover)
46 Front cover 47 Rotation direction positioning recess 56 Labyrinth structure 58 Rear seal ring (seal ring)
59 Packing 60 Washer

Claims (3)

  A cylindrical portion for connecting an intake hose is provided at the upper part of a throttle body having an intake passage through which air flows from the upper side to the lower side of the vehicle, and the outer peripheral wall of the intake passage is thicker than the cylindrical portion below the cylindrical portion In the waterproof structure of the throttle device in which a through hole through which the throttle shaft passes is formed in the pedestal portion, and an auxiliary machine is connected to the end of the throttle shaft protruding from the through hole, the cylindrical portion penetrates A throttle device characterized in that a plate-shaped waterproof cover provided with a cover portion covering a joint surface between the pedestal portion and the auxiliary machine is provided on the outer periphery of the cylindrical portion. Waterproof structure.   The waterproof structure for a throttle device according to claim 1, wherein the waterproof cover is sandwiched between an axial end surface of the intake hose and the pedestal portion.   A seal ring is disposed between the throttle shaft and the through hole, and a washer is disposed between the seal ring and the auxiliary machine in the axial direction of the throttle shaft to restrict the movement of the throttle shaft in the axial direction. The waterproof structure for a throttle device according to claim 1.

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