JPH085412Y2 - Belt drain mechanism room drainer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a drainage device for a belt transmission mechanism room such as a unit swing type engine of a motorcycle.

(Prior Art) A scooter type motorcycle uses a unit swing type engine. This is one in which a swing case is connected from one side of the crank case to the rear, the rear wheel is pivotally supported at the rear part, and the engine and the rear wheel are integrated, and the front part is a frame that can swing up and down freely. Is supported by the shock absorber unit and the rear portion is supported by the shock absorber unit, so that the shock absorber is suspended at the rear portion of the vehicle body.

The swing case is formed by covering the case body with a cover, and houses a transmission mechanism that transmits power from the crankshaft to the rear wheels. A V-belt transmission mechanism is generally used for the primary conduction. Since the V-belt transmission mechanism dislikes oil, most of the inside of the swing case is partitioned as a dry belt transmission mechanism chamber. However, in such a narrow space, heat generated due to a severe action is accumulated and the temperature of the belt and the pulley rises, which affects the life of the belt and the shifting function.

Therefore, in order to suppress this temperature rise, a method of circulating cooling air in the swing case is adopted. As the cooling air, a part of the cylinder cooling air is sent from the front part of the swing case and discharged from the rear part. The inlet and outlet of the cooling air are formed integrally with a part of the manufacturing cover.

On the other hand, when the cooling air is introduced in this way, water may mix with the air and enter the swing case. Since it is not preferable for the V-belt transmission mechanism to have water as much as oil, a water draining device for preventing a large amount of water from accumulating is provided.

As shown in FIG. 9, in the water draining device, in the lower bottom portion of the swing case, the upper edge of the gasket c interposed between the mating surfaces of the case body a and the cover b projects above the mating surface, and the bottom of the cover b is formed. A groove d is formed in the
Through this, the water that has entered from the inlet of the cooling air is guided to the drainage portion arranged at the lowest portion.

The water draining portion is formed around a water draining hole which is formed by vertically cutting out the cover side of the mating surface of the case body a and the cover b. Above the water draining hole, an expansion chamber formed by a gasket c having a recess and a through hole is continuous, so that the water guided to the groove d passes over the gasket c and temporarily moves to the case body a side. After coming out, it is necessary to pass through the through hole of the gasket and be guided to the water drain hole, resulting in insufficient water drainage.
There is a problem. Further, the protrusion of the gasket c is prone to fall down, and the shape of the concave groove d is collapsed to cause unstable water flow.

(Problems to be Solved by the Invention) The present invention has been made to solve the above-described problems, and the protruding posture of the gasket is stable, the water circulation groove is stably and correctly maintained, and An object of the present invention is to provide a drainage device for a belt speed change mechanism chamber that allows water to smoothly flow from a groove to a drainage port.

[Constitution of device]

(Means for Solving the Problem) With the above-mentioned object, the drainage device of the belt transmission mechanism chamber of the present invention has a substantially U-shaped cross-section case body 14a having an open outer side, and a forward direction inside the case body 14a. Placed drive shaft
A V-belt transmission mechanism A for transmitting power between the driven shaft 19 and the driven shaft 19 arranged behind the cover 17, and a cover 14b for covering the case main body accommodating the V-belt transmission mechanism A from the outer open side.
A gasket 16 interposed between the mating surfaces of the case body 14a and the cover 14b, an outside air introduction port 25 for introducing outside air into a closed space B formed by the case body 14a and the cover 14b,
A discharge port 26 for discharging the atmosphere in the closed space B to the outside, and a discharge port for discharging the water accumulated in the lower part of the closed space B to the outside.
37, respectively, and the gasket 1 of the case body 14a
The thickness T1 of the mating surface with 6 is thicker than the thickness T2 of the mating surface with the gasket 16 of the cover 14b, and the width of the gasket 16
T3 is made wider than the wall thickness T1 of the case body 14a,
A drain port 37 is provided between the bottom surface of the cover 14b and the gasket 16.
It has a structure in which a water flow groove 28 leading to the water is formed.

(Operation) With this structure, since the thickness of the mating surface on the case body side is thicker than that on the cover side, the gasket is supported reliably and stably, and the posture of the protrusion is It stabilizes and guides running water smoothly and smoothly without breaking the formation of the water flow groove between the cover and the gasket.

Thus, the water that has entered the belt transmission mechanism chamber together with the cooling air is quickly drained, and the belt transmission mechanism is guaranteed its functionality for a long time by suppressing the temperature rise and preventing water from getting wet.

(Embodiment) A description will be given below of a drawing which is an embodiment of the present invention.

 FIG. 8 shows an example of the scooter.

A front wheel 1 steered by a steering wheel 3 and a rear wheel 2 driven by an engine 4 are arranged in front and rear, and a space between the steering wheel 3 and a seat 5 is lowered so that a step board 6 is laid and a seat 5
Is placed on the rear body 8 which also serves as the storage box 7,
The engine 4 is arranged under the rear body 8.

The engine 4 is a unit swing type that is integrated with the rear wheel 2. A support arm 9 at the lower front is pivotally supported by a frame 10 so as to be vertically swingable, and an upper rear is supported by a buffer unit 11.
Suspended.

In the unit swing type engine, as shown in FIGS. 1 and 2, a crankcase 13 is connected behind a cylinder 12 that tilts substantially horizontally forward, and a swing case 14 is integrated from one side of the crankcase 13 to the rear. Is connected to the rear axle 15, and a rear axle 15 is provided at the rear portion thereof, and the rear wheel 2 positioned immediately behind the crankcase 13 is pivotally supported by the rear axle 15.

The swing case 14 is configured to be vertically separable into two parts, and is formed by combining a case body 14a having a substantially U-shaped cross section that is open to the outside and a cover 14b that covers the case body 14a from the outside. A gasket 16 is provided on the mating surface.

In the swing case 14, a drive V pulley 18 is mounted on a crankshaft 17 protruding as a drive shaft, and a V belt 21 is suspended between the drive V pulley 20 mounted on an intermediate shaft 19 serving as a driven shaft. Then, the V-belt transmission mechanism A is equipped as the primary conduction. Reference numeral 22 is a centrifugal shoe-type starting clutch interposed between the driven V pulley 20 and the intermediate shaft 19.

The other end of the intermediate shaft 19 plunges into an independent gear chamber 23 and forms a secondary transmission with the rear axle 15 as a gear transmission mechanism 24.
Is equipped with. The gear chamber 23 is a wet type in which oil is sealed, and the inside of the swing case 14 is a sealed belt transmission mechanism chamber B, and the sealed chamber B is set to a dry type.

Next, the cover 14b of the swing case 14 is provided with an outside air introduction port 25 for cooling air at a front portion thereof and an outlet port 26 for cooling air at a rear portion thereof. The outside air inlet 25 is a swing case 14
A part of the air blown by the cylinder cooling blower fan 27, which is formed on the cover 14b side and is pivotally supported on the other end of the crankshaft 17, is routed through a duct (not shown). It is sufficient that the outside air as the cooling air is guided from the outside air introduction port 25 into the belt transmission mechanism chamber B. The cooling air is also sucked by the pulley fan 18 provided in the drive pulley 18.

The introduced cooling air passes through the swing case 14 and is discharged to the outside from the outlet 26. Meanwhile, V belt
21 and drive and driven V pulleys 18, 20 carry out heat generation to suppress temperature rise, prevent deterioration of V belt 21, etc., and stabilize gear shifting performance.

On the other hand, the mating surface between the case body 14a and the cover 14b at the lower bottom of the swing case 14 is set such that the wall thickness T ₁ on the case body 14a side is thicker than the wall thickness T ₂ on the cover 14b side as shown in FIG. There is. The width T ₃ of the gasket 16 interposed in this portion is set to be wider than the thickness T _{1 of the} mating surface on the case body 14a side. That is, T ₂ <T ₁ <T ₃ , the upper edge of the gasket 16 is projected, and the bottom surface of the cover 14b and the gasket 1
A water circulation groove 28 is formed between the groove 6 and the groove 6. Case body 14a
The gasket 16 interposed between the cover 14b and the cover 14b is located outside the belt line of the V-belt 21 of the V-belt transmission mechanism A.

In this case, since the water flow groove 28 formed between the bottom surface of the cover 14b and the gasket 16 has a wall thickness T1 on the case body 14a side that is larger than the wall thickness T2 on the cover 14b side, the water flow groove 28 extends in the direction orthogonal to the gasket surface. The weak gasket 16 can be effectively prevented from collapsing, and the water passage can be secured stably and without collapsing.
In the usage pattern as shown in FIG. 9, the gasket 16 may fall down and the water passage may not be stably secured. The V-belt speed change mechanism A is weak against water, and if water gets on it, the speed change function is impaired.
It is important to secure 28 on the cover 14b side stably.

At the lowest part of the swing case 14, as shown in FIG. 7, a draining part 29 leading to the drainage port 37 is arranged. First, the drainage portion 29 is provided with a drainage hole 30 by a vertical groove formed on the mating surface of the gasket 16 and the cover 14b.
A recessed chamber 31 and an expansion chamber 33 formed by a gasket extension 16a having a through hole 32 are connected above the water drain hole 30.
Further, in the lower part, the expansion chamber 3 formed by the recessed chambers 34a and 34b formed in the case body 14a and the cover 14b, respectively.
5 are serially installed. The expansion chamber 35 is partitioned by the gasket 16b,
A through hole 36 is formed in the gasket 16b. Then, a drainage port 37 is opened on the inner surface of the recessed chamber 34a on the case body 14a side.

The wall thickness difference between the case body 14a and the cover 14b mating surface gradually disappears as it approaches the water draining portion 29, and
31 In front of the front wall, it is set to be on the same plane. Make sure that the upper edge of the gasket 16 is at the same height
38 is formed (FIG. 6).

In this way, the water that has entered from the outside air introduction port 25 together with the cooling air immediately falls down, is collected in the water flow concave groove 28, and flows backward. The front wall of the concave chamber 31 makes the concave groove 28 a dead end, so it bypasses the case body 14a side through the notch 38, passes through the through hole 32 and enters the expansion chamber 33, and then from the drain hole 30. It falls into the expansion chamber 35 and is discharged to the outside through the through hole 36 and the drainage port 37.

During this time, the water flows smoothly without staying, and the drainage performance is high. Therefore, it is possible to reliably prevent the occurrence of a trouble in which the V-belt gets wet and slips, and the deceleration function is degraded.

Since the water draining section 29 has a maze structure with some expansion chambers, it is possible to prevent the muddy water splashed from the rear wheels from entering the swing case 14.

Further, since the thickness of the mating surface of the case body 14a is set to be thicker, the holding force of the gasket is high, the protruding attitude of the upper edge is difficult to collapse, and the shape of the concave groove 28 is maintained for a long period of time.
The above-mentioned water removal action is stable for a long time.

[Effect of device]

As described above, in the water drainage device for the belt transmission mechanism chamber according to the present invention, the wall thickness T1 of the contact surface of the case body 14a with the gasket 16 is equal to the wall thickness T1 of the contact surface with the gasket 16 of the cover 14b.
2 and the width T3 of the gasket 16 is wider than the wall thickness T1 of the case body 14a.
Since the water flow groove 28 leading to the drainage port 37 is formed between the bottom surface of 4b and the gasket 16, it is possible to prevent the gasket from falling and to stably and reliably secure the water flow groove.
V of the belt speed change mechanism in which the protruding posture of the gasket is stable, the drainage is properly guided, and the water can flow out from the water flow groove to the drainage port without smoothly accumulating the cooling air. Effectively prevents the belt from getting wet.

[Brief description of drawings]

FIG. 1 is a side view of a swing case of a motorcycle unit swing type engine according to an embodiment of the present invention with a cover removed, FIG. 2 is a cross-sectional plan view of the unit swing type engine of FIG. 1, and FIG. 2 is an enlarged side view of the main part of the cover taken along the line AA in FIG. 2, FIG. 4 is a developed view showing the mating surface of the drainage part in FIG. 1, and FIG. 6 is an enlarged sectional view taken along the line CC in FIG. 1, FIG. 7 is an enlarged sectional view taken along the line D-D in FIG. 1, and FIG. 8 is a scooter-type motorcycle. Fig. 9 is a side view of Fig. 9 and Fig. 9 is a sectional view showing a main part of a conventional water draining device. 13 …… Crank case, 14 …… Swing case, 14a…
… Case body, 14b …… Cover, 15 …… Rear axle, 1
6 …… Gasket, 17 …… Crank shaft, 18 …… Drive V pulley, 20 …… Driven V pulley, 21 …… V belt, A …… V belt transmission mechanism, B …… V belt transmission mechanism chamber (closed chamber ), 25 …… Outside air inlet, 26 …… Outlet, 28
…… Water circulation groove, 29 …… Drainage part, 30 …… Drainage hole,
33,35 …… Expansion chamber, 37 …… Drainage port, 38 …… Notch.

Claims (1)

[Scope of utility model registration request] 1. A case body having a substantially U-shaped cross section whose outer side is open.
14a and a drive shaft 17 arranged in front of the case body 14a.
V for transmitting power between the driven shaft 19 and the driven shaft 19 arranged behind it.
The belt transmission mechanism A, a cover 14b for covering the case body accommodating the V-belt transmission mechanism A from the outside open surface side, the gasket 16 interposed between the mating surfaces of the case body 14a and the cover 14b, and the case body 14a. The outside air introducing port 25 for introducing outside air into the closed space B formed by the cover 14b, the discharge port 26 for discharging the atmosphere in the closed space B to the outside, and the water accumulated in the lower part of the closed space B to the outside. Outlet to discharge to 37
And a gasket 16 of the case body 14a.
The thickness T1 of the mating surface with the gasket is made thicker than the thickness T2 of the mating surface with the gasket 16 of the cover 14b, and the width of the gasket 16 is
T3 is made wider than the wall thickness T1 of the case body 14a,
A drain port 37 is provided between the bottom surface of the cover 14b and the gasket 16.
A drainage device for a belt speed change mechanism chamber, characterized in that a water circulation groove 28 that communicates with the belt is formed.