JPS599365A - Internal combustion engine cooling system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cleaning device for an internal combustion engine, which is suitable for an internal combustion engine mounted on a motorcycle.

Internal combustion engines (C) for motorcycles, etc. have a transmission booth with a crank case and a transmission case installed below the cylinder block, and the engine crankshaft and output shaft are installed side by side within this transmission case. However, it is known that these are connected via an automatic continuously variable transmission so that the gear ratio can be automatically changed depending on the throttle operation of the engine and the driving conditions of the vehicle. However, the continuously variable transmission is generally housed in a sealed transmission case, and has heat generating parts such as the drive and the contact part between the driven pulley and l/belt, as well as other equipment such as the clutch and reducer. As the transmission case is accommodated, the temperature of the transmission booth tends to rise to below zero, and this tendency is particularly strong in cases where the transmission case is made more compact.

The present invention has been made in consideration of the above-mentioned circumstances, and is designed to effectively cool the inside of the transmission case of an engine, by directing cooling air to the continuously variable transmission side of the transmission case. Open the exhaust air on the side of the case that goes away from the continuously variable transmission, and then open the crank in the transmission case.
1 and the output shaft, a cooling air passage is formed in the axial direction thereof, and the cooling air passage is communicated with the air guide port and the air exhaust port.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which the present invention device is implemented in a two-cycle internal combustion engine for a motorcycle will be described below with reference to the drawings.

In the following description, "front, rear" and "left, right" refer to the body frame i/' of the motorcycle.

In FIG. 1, a two-stroke internal combustion engine is mounted on a body frame F of a motorcycle. The main body E of this organization is
The transmission case 2 includes a cylinder block 1 that is tilted forward with respect to the vehicle body frame FVc, and a transmission case 2 that is integrally connected to the lower part of the block 1. A mission chamber 4 is formed at the rear thereof.

The transmission case 2 is constructed by integrally connecting the left and right cover cases 22 and 23 to the right side of the case main body 2 having two left and right sides 711. Transmission case 2. A crankshaft 5 is rotatably supported in the crank chamber 3, and a piston 8 which is slidably fitted into a cylinder 7 is connected to a crank bin 51 of the crankshaft 5. In the transmission case 2's miso/control chamber 4, there is an output of 1fQt+
9 is rotatably supported by the crank +]l+ 5 and Y row (・).

Inside one side of the transmission case 2, the crank east ()
5 and the output speed 19, a +7 belt type automatic continuously variable transmission T is installed. This transmission T is conventionally known, so to briefly explain its structure, a drive pulley 10 is provided at the right end of the crankshaft 5, and a drive pulley 10 is provided at the right end of the output shaft 9. A driven pulley 11 with a large diameter is also provided, and those boots IJ 1
An endless V-belt 12 is suspended between 0 and 11. The drive pulley 10 is a fixed drive pulley half 10 fixed to the crankshaft 5. and a movable drive gear half body 10□ which is slidably supported in the axial direction on the crankshaft 5, and this movable drive gear half body 10□ is
Under centrifugal force, this is fixed into a fixed drive boob half10. The driven pulley 11 is equipped with a fixed driven pulley 11 fixed to a hollow pulley shaft 14 rotatably supported on the output shaft 9. ．． and a movable driven bogie half 1 that can slide axially on the pulley shaft 14.
12, this movable driven pulley half 11
2 is biased toward the fixed driven pulley half 111 by the pulley A 15.

An automatic starting centrifugal clutch C is provided on the output shaft 9 and inside the driven pulley 11. This centrifugal clutch C
is also conventionally known, so to briefly explain its structure, a clutch weight 16 is attached to the end of the pulley 14.
The drive plates 1 to 17 supporting the -1 are fixed and the clutch shaft 18 is spline-engaged to the output
In this case, when the clutch outer 19 is fixed and the rotation speed exceeds a set value, the clutch weight 16 or the clutch outer 19 is engaged and connected to the pulley bar 114 or the output shaft 9. Become ℃・ro.

A gear case 20 is formed at the center of the rear part of the transmission booth 2 so as to surround the left half of the output shaft 9, and a reduction gear mechanism G is incorporated into this gear case 20. A reduction shaft 21 is rotatably supported in the gear case 20 in parallel with the output l11]9, and the reduction shaft 21vC is integrally provided with a large-diameter first reduction gear 22 and a small-diameter second reduction gear 23. The first reduction gear 22 is meshed with a drive gear 24 that is integral with the output shaft 9, and the second reduction gear 23 is a large diameter gear that is integral with a final shaft 26 that is rotatably fitted into the left end of the output shaft 9. It meshes with the third reduction gear 25. The final shaft 26 is rotatably supported by the gear case 20, and its left half protrudes outside the gear case 20. A driving tin rocket 28 of a chain reduction gear mechanism 27 is fixed thereto, and this sprocket 28 is connected to an endless chain drive 29. tL7+ is linked to the rear wheel (not shown) via. Therefore, when the crankshaft 5 is rotated by the drive of the engine E, this rotation is transmitted to the output shaft 9 via the V-belt type automatic continuously variable transmission T, the centrifugal clutch C1, and the reduction gear mechanism G, and then from this to the final It is transmitted to the rear wheels via the shaft 26 and the cheno reduction mechanism 27.

On the left side of the final shaft 26 is a left cover case 22.
The pedal, which is rotatably supported by the pedal, is arranged in tandem on the same axis as the final axis 26, and this pedal! The moving axis 30 to 9 is a chain! , 1! It is linked to a pedal crank (not shown) via a g-movement mechanism 31. A clutch ring 32 is slidably fitted around the 91st round of the final shaft 26 and the pedal drive shaft 30, and the clutch ring 32 is slidably connected to the final shaft 26 and the pedal drive shaft 30. The operating handle 33 is connected.The clutch ring 32 is in the engaged position as shown in FIG.
The motion shaft 30 and the final shaft 26 are connected, and the final shaft 26 can be driven by the driver's pedal depression, making it possible to travel by pedaling. In addition, when the handle 33 is moved to the left as shown by the chain line in Figure 1, the clutch ring 32 is also shifted to the left, and the final shaft 2
6 and the pedal drive 1lill130 should be disconnected.

An alternator A is connected to the left end of the crank M5.

Further, a pinion shaft 34 is provided between the crankshaft 5 and the output shaft 9, and an internal gear 36 connected to the starting kick shaft is meshed with a pinion 35 at the left end of the pinion shaft 34, and an internal gear 36 is engaged with the right end of the pinion shaft 34. The starting gear 37 is connected to the crankshaft 5
'' - can be engaged with and disengaged from the driven gear 38.

Note that Ac and Ca in FIG. 1 are an air cleaner and a carburetor of the intake system of the engine body E.

Incidentally, a new cooling device is provided in the transmission case 2 to effectively cool the continuously variable transmission T, centrifugal clutch C, reduction gear mechanism G, and generator A incorporated therein. Next, the specific configuration of this cooling device will be explained.

As shown in FIGS. 1, 2, and 7, an inner case 40 is fixed to the inner wall of the right cover case 23 of the transmission case 2, and an air guide passage 41 is formed between the inner case 40 and the transmission case 2. Ru. The air guide passage 41 has an opening 1-1 in the rear wall of the transmission case 2, and the air cleaner 4
3, and this air 1-43 person [1] is opened to the atmosphere. In addition, the output +144 of the conductive m path 41
is connected to the air guide 45 which is opened to the inner case 40 on the side of the driven booby 11. Note that the air guide passage 41 is connected to the right cover case 2. It may be formed by looking at it.

At the right end of the output 1 drawer 9, a water linori board 46 (of the certificate) is fixed, and the periphery of this water draining board 46 is connected to the air guide [14].
5 is on the way. 4. As clearly shown in FIG. 7, the C cover case 23 and the inner case 40
A drain passage 47 leading to the drain passage 47 is formed, and an outlet 148 of this drain passage 47 is opened at the lower part of the transmission case 2, and a porous material 49 is provided there. Driven pulley 1
1 fixed side driven pulley half 11. A suction fan 50 is provided on the back side of the transmission case 2, and this suction fan 50 introduces clean outside air from the air cleaner 43 into the transmission case 2 through the air guide passage 41 when the driven pulley 11 rotates. . Also, on the back of Drive Boo January 00 Fixed Drive Boo Half Holiday 101 is +! An L stirring blade 51 is integrally provided, and this stirring blade 51 acts to stir the cooling air introduced into the transmission case 2 and cause the cooling air to flow in the radial direction.

3. As shown in FIG. 5, inside the transmission case 2, the outer circumference of the automatic continuously variable transmission 1''
A cooling air passage 52 is provided between the output shaft 9 and the output shaft 9, and further below them.
, 53 and 54 are formed, and their flow paths 52, 5
3 and 54, the cooling air should flow sequentially as shown by the solid line arrows in Figure 3.4.5.

As clearly shown in FIG.
] 56 is opened [-], and a louver 57 is installed at the exhaust port 56.
be formed.

Next, the operation of the embodiment of the present invention will be explained.

When the automatic continuously variable transmission T is now driven by the operation of the engine H, the suction fan 50 fixed to the fixed driven pulley half 11° of the driven pulley 11 moves to the air cleaner 437 as shown by the solid line in FIGS. Clean cooling air of 'J・') is sucked into the transmission case 2 through the air guide i!
As a result, it is blown away in the radial direction, and the right case horn bar 2. The water is drained to the outside from the drain 48 shown by the dotted line in FIG.

The cooling air from which moisture has been removed is forced to be sent in the radial direction of the driven booby 11 by the suction fan 50.

The pressurized cooling of the outer periphery of the driven pulley 11 flows through the cooling air passage 52 between the automatic continuously variable transmission 1 and the transmission case 2 to the dry pulley 10, and the fixed side drive pulley of the 8 pulley 10 is partially suspended. The V-belt 12 of the automatic continuously variable transmission T is stirred by the stirring blade 51 provided in the automatic continuously variable transmission T.
This effectively cools the heat generating parts such as the friction 1 contact part of the driven pulley 11 or the drive pulley 10. The cooling air that has cooled the automatic continuously variable transmission 1' passes between the drive pulley 10 and the driven boob 911 as shown in Figures 2 and 3.
Cooling J formed between the crankshaft 5 and the output 1lQb 9
! After cooling the centrifugal clutch C and the reduction gear case 2.0 through the clutch outer 19 and the outer periphery of the reduction gear case 20, it flows through the i passage 53 along the axial direction of the transmission case 2. It reaches the opposite side of the automatic continuously variable transmission 1', where some of the cooling air passes through the outer circumference of the generator A and cools the generator A. As shown in Figures 4 and 5, the cooling air that sequentially forcedly cools the automatic continuously variable transmission T, centrifugal clutch C, reduction gear mechanism G, and generator A in the transmission case 2 is shown in Figures 4 and 5. Crankshaft 5 as shown
and exhaust air t15 through the cooling air passage 54 under the output shaft 9.
It should be released to the outside from 6.

By the way, the heat generating parts such as the contact parts between the automatic continuously variable transmission 1゛θ bar I' belt 12 and the drive pulleys 10 and 0 and driven pulleys 11 are forcibly sucked into the transmission case 2 by the suction fan 5o. 1 between the crankshaft 5 and the output 1 sleeve 9.
Even if the transmission case 2 is made more compact by shortening the distance between the lungs, it is possible to prevent an excessive rise in temperature inside the case 2, and the l/belt 120
Do everything you can to prevent deterioration due to heat generation.

Furthermore, since the driven pulley 11 is rotated at high speed as the vehicle speed increases by -1, the amount of cooling air sucked by the suction fan 5o increases as the rotational speed of the driven pulley 11 increases, that is, the amount of heat generated by the heat generating section increases. The number increases as the size increases, and the cooling family is efficient and there is no fan loss.

As described above, according to the present invention, the cooling air guide 1'' 45 is opened on the side of the continuously variable transmission T of the transmission case 2, and the side of the case 2 from which the continuously variable transmission 1'' also goes away. Exhaust air "1"
56 is opened, and cooling air passages 53 and 54 are formed between the crankshaft 5 and the output shaft 9 in the axial direction thereof, and these cooling air passages 53 and 54 are communicated with the air guide port 45 and the air exhaust port 56. Therefore, after effectively cooling the heat generating part of the continuously variable transmission T in the transmission case 2, the cooling air is used to cool the centrifugal clutch C1, reduction gear mechanism G, generator A, etc. in the transmission case 2. It can be cooled and the service life of the continuously variable transmission T and other equipment can be increased.

Furthermore, even if the effective volume of the transmission case 2 is reduced, the case 2
It is possible to suppress excessive temperature rise inside the transmission case 2.
When making the case 2 more compact, there are no restrictions due to the temperature rise inside the case 2.

[Brief explanation of drawings]

Fig. 1 is a side view of an internal combustion engine equipped with the device of the present invention mounted on the body frame of a motorcycle, Fig. 2 is a developed sectional view taken along the line II-II of Fig. 1, and Fig. 3 is Fig. 2 III-
A sectional view of the transmission booth along line Ill, FIG.
Figure 5 is a cross-sectional view of the transmission case taken along line IV--IV, Figure 5 is a cross-sectional view taken along line V-V in Figure 2, Figure 6 is a side view of figure 2, line ■, and Figure 7 is a side view taken along line 11-1. 1-■1 A developed cross-sectional view is shown. 1... Cylinder block, 2... Transmission case, 3...
・Crank chamber, 4...Mission chamber, 5...Crankshaft, 9...Output shaft, 45...Air guide [-1, 56...
・Exhaust air [-1, I-... Automatic continuously variable transmission. Patent applicant Honda Motor Co., Ltd. -40? Figure 71. Indication of the case 1982 Patent Application No. + 18280 2, Title of the invention Cooling device for internal combustion engine 3, Person making the amendment Relationship to the case Patent applicant name (532) Honda Motor Co., Ltd. 4th generation
Mr. 105 Address: 4-4-5 Shinbashi, Minato-ku, Tokyo No. 7 Mura Building 5, Amendment Order Nikkan October 7, 1982) -] (Date of dispatch = October 26, 1981) 6. Target of correction Contents of correction 1, page 5, line 7 of the specification...1 Transmission case2. -1 ・Toorona... ``
Transmission case 2”... is corrected. 2゜Specification No. 600, Line 8, ・['71tJrrvD-1...It says...
"Moveable -1...and correction 1-ro. :Uh, Akira fIO, page 6, line 11, ...[-closer]...toorona, 1 closer." ...I am corrected. 1゜4, Meibu 1, the last line of page 6, is corrected as ``formation''...toruna, 1 composition''... 5. In the second line of page 7 of the specification, the statement ``1-approaching-1'' was corrected to ``[-approaching-1...'' J-ru]. 6. Specification Secretary 7 Wataru No. 15. 16th. Line 17, page 8, no. Line 9, ...[-gear case]...Tooruna, ...[Reduction gear case-1...] is corrected. 7゜Specification, page 8, line 13, [Engine/? Correct the statement ``driving the engine'' to ``driving the engine.'' 8゜Details 1. 10th white end line - 11th page 2nd line, [-1st
．． 2...Transmission case 2"...Please correct it as follows. [Not shown in Figures 1, 2 and 7] 5) Right cover case 2. An inner case 40, which is a part of the transmission case 2, is fixed to the inner wall of the transmission case 2. This inner case 40 and the right cover case 2. 19. On the last line of page 11 of the specification, the statement ``li7: j constant one-law drift'' is corrected to ``rriffi constant drip''. 10 Page 12, line 3 of the specification. ...[Clean outside air 1]...Corrected it to "clean cooling air"...1-ro. 11 Details! ``12th auto, line 14, ・[Flow passageway''... and e)ru] ・[Cooling air passage-1...'' and corrected ``1-ru.'' 12. Specification, page 13, In the first line, ``Institution L゛''... was corrected to read ``1 institution.'' 13 In the specification, page 13, line 11, the statement ``Right case cover 1...'' is corrected to [-Right cover case''... 14. Page 14, line 2 of the specification: ・[Fixed side drive pulley half-off”...Don't go through...[Fixed drive pulley half-closed]... Corrected. 15 Specification, page 14, lines 4 and 5, ・[Aro ℃・14 j...Correct Aro to...[and -1...]. 16 Specification No. 160, line 9, ...[Continuously variable transmission 1'',]...toorona..."Continuously variable transmission 1"...is corrected. 17. Page 16, line 12 of the specification: ``A, etc.''...... ``A, etc.''
...I am corrected. 18 Specification, page 17, No. 6. In line 7, ``Cross-sectional view'' is corrected to ``1-side 1-1''. 19 Correct all sections of the drawing as separate groups. that's all

Claims (1)

[Claims] Below the cylinder block (1), there is a crank chamber (
Transmission case (2) with a transmission case (3) and a mission room (4)
) are arranged in series, and a crankshaft (5) is installed in the transmission case (2).
and an output shaft (9) are arranged in parallel, and a continuously variable transmission (7') connecting the crankshaft (5) and the output shaft (9) is provided on one side of the transmission case (2). provided, the crankshaft (5
) in which the rotation of the engine is transmitted to the output shaft (9) via the continuously variable transmission (7'), cooling air is provided to the continuously variable transmission (T) side of the transmission case (2). Wind guide 1]
(45), and an air exhaust port (56) is opened on the side of the case (2) that goes away from the continuously variable transmission (T);
Cooling air passages (53, 54) are formed between the crankshaft (5) and the output shaft (9) in the axial direction thereof, and the cooling air passages (53° 54) are connected to the air guide port (45). A cooling device for the internal combustion engine that communicates with the exhaust port (56).