JPH0231061A - Case structure of power transmission device - Google Patents

Abstract

PURPOSE:To simplify a power transmission device and reduce its size by supporting a middle part of a rotary shaft common to a main and an auxiliary speed changer by a shaft bearing of a middle case, and extending a main speed changer case and a middle case to form a crank case. CONSTITUTION:A middle part of a counter shaft 22 common to a main and an auxiliary speed changer 3, 4 is supported by a shaft bearing 15b of a middle case 7, and a main speed changer case 6 and the middle case 7 are extended to form a crank case 9 of an internal combustion engine 1. Rotation of a crank shaft 11 is transmitted through the main and auxiliary speed changers 3, 4 to a main shaft 24. Rotary shafts 21, 28 of the main and auxiliary speed changers 3, 4 are disposed axially close to each other, so the axial length of a gear case 5 is short. In addition, because the gear case 5 and the crank case 9 are integrated, the crank shaft 11 and the main speed changer shaft 21 are disposed close to each other, so the whole device is composed low, and gears 12, 13 interlocking the shafts 11, 21 can be of small diameters.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an engine-integrated power transmission device used for driving a vehicle or the like.

(Prior art) Vehicles with a large number of gears or vehicles that use a transmission with a large deceleration rate have a large transmission, so
As shown in Figure 23, the transmission is generally made as a separate element from the engine, and these are mounted at appropriate locations on the vehicle body.

(Problems to be Solved by the Invention) According to the above-mentioned prior art, there are disadvantages in that the transmission is large and requires a large installation space because it is attached to the vehicle body separately from the engine.

Therefore, an object of the present invention is to simplify and downsize the power system by housing an engine, transmission, and differential in an integrated case, and also to make the transmission itself compact.

(Means for Solving the Problems) The above-mentioned problems of the present invention are as follows: (1) A gear-type main transmission and a sub-transmission that transmit the rotation of the crankshaft of an internal combustion engine to an output shaft are sequentially provided, and both transmissions are mounted in a gear case. In a case structure of a power transmission device in which the rotating shaft is accommodated and supported by a bearing provided in the case, an auxiliary transmission is provided on an extension of the axis of the main transmission, and a main transmission case, an intermediate case, and an auxiliary transmission case are provided. Both transmissions are housed in a gear case that is connected to the
The bearing provided in each case supports the end of the rotating shaft housed in each transmission, and the intermediate part of the rotating shaft common to both transmissions is supported by the bearing in the intermediate case, and the main transmission case Means characterized in that the intermediate case is extended to form a crankcase of an internal combustion engine; and 2. Means characterized in that the means of 1 above is provided with a differential case integrally protruding from the end face of the auxiliary transmission case. Solved by adding means.

(Function) By the means described above, the rotation of the crankshaft is transmitted to the output shaft via the main and sub-transmissions. The rotating shafts of the main and sub-transmissions are arranged close to each other in the axial direction, so the axial length of the gear case is short, and since the gear case and crankcase are integrated, the crankshaft and main transmission shaft are By being arranged close to each other, the overall height of the device can be reduced, and the gear that interlocks both shafts can be made small in diameter.

(Example) Examples will be described below with reference to the drawings. In FIG. 1, A is a power transmission device, 1 is an internal combustion engine thereof, 2 is a main clutch, 3 is a main transmission including the main clutch, and 4 is an auxiliary transmission. A gear case 5 that houses both transmissions 3.4 includes a main transmission case 6 that houses a half of the main transmission 3, and a main transmission case 6 that houses one half of the main transmission 3.
Intermediate case 7 that accommodates the other parts and one half of the sub-transmission 4
, and an auxiliary transmission case 8 that accommodates the other parts of the auxiliary transmission 4, and each case 6.7.degree. 8 is fixed with bolts (not shown) with their end surfaces overlapped.

The internal combustion engine 1 includes a crankcase 9, a connecting rod 10. Only a portion of the crankshaft 11 and the like are shown, and the crankcase 9 is formed from an extension 6a of the main transmission case 6 and an extension 7a of the intermediate case 7. The output pinion 12 of the crankshaft 11 meshes with an input gear 13 attached to the main clutch 2 via a buffer, and drives the input shaft 21 of the main transmission 3 via the friction plate of the clutch 2. ing.

Two bearings 14a, 1 are mounted on the end wall of the main transmission case 6.
4b, and bearings 15a, 15b, 15c, 15d, and 15e are provided on the wall provided in the middle of the intermediate case, and the bearing L5b supports the through shaft.

Further, the sub-transmission case 8 includes bearings 16a18b, 16
c, 16d are provided, a differential case 17 extending beyond the bearing led portion is protruded from the end thereof, a case cover 18 is fixed with bolts 19, a differential driven bearing 20 is formed on the mating surface, A rotating wheel is supported on each bearing.

The input shaft 21 of the main transmission 3 is supported by bearings 14a and 15a, and gears g1, g2, which rotate integrally on the input shaft 21,
A slidable gear g3, a rotatable gear Q<, g5 are provided, and a clutch tooth is provided on the opposite surface of the gear 'J41 (I5), and a clutch tooth that meshes with the clutch tooth is provided on both sides of the gear g3. will be provided.

The counter shaft 22 is installed to pass through the main and sub-transmission,
It is supported by bearings 14a, 15b, and 18b. The axis 2
On the main transmission side of No. 2, there is a gear 6 that meshes with the gears g1 to g5.
1 to G6 are provided, and gears G,, G2. G3 is rotatable and has clutch teeth; G4. G5 is slidable and G,
It has clutch teeth that mesh with the clutch teeth of ~G3.

Therefore, by appropriately engaging each clutch tooth, the counter shaft 22 can be driven at the 1st to 5th speeds.

A low-speed gear g6 and a high-speed gear g7, which is a combination of large and small gears g7-+ + g7-2, are loosely fitted on the sub-transmission 4 side of the counter shaft, and mesh with the clutch teeth of gears Qs and 'J7. A sliding gear g8 is provided with clutch teeth on both sides.

The driven shaft 23 of the sub-transmission 3 is supported by bearings 15c and Lee, and an intermediate gear G6 having gears 66-1 and 06-2 is loosely fitted thereto, and the gear G6-1 meshes with the low speed gear g6. Gear G6-2 meshes with large gear g7-1 of high speed gear g7. The driven shaft 23 also includes a driven gear G7, a driving gear G,
is fixed, and the drive gear G8 is fixed to the bearings 15a and 16a.
A drive pinion 25 is provided at the tip of the output shaft 24 and meshes with a ring gear of a front differential 26. A propeller 27 is connected to the rear end of the output shaft 24 to drive a rear differential.

An intermediate shaft 28 for backward drive is supported by bearings 15e and lea, a reverse drive gear R1 is fixed thereto, a reverse idle gear R2 is loosely fitted, and a reverse shifter 29 is slidably provided. The reverse drive gear R1 meshes with the sliding gear g8 of the counter shaft 22 at all times or when the gear g8 is in neutral, and the reverse idle gear R2 meshes with the driven gear G7 of the driven shaft 23.

Therefore, in the sub-transmission 4, by moving the sliding gear g8 to the right, the clutch of this gear is engaged with the low-speed gear g6, and the rotation of the counter shaft 22 is changed from the low-speed gear g6 to the gear c6-.
+ l 06-2 + g7-1 + g7-2
It can be transmitted to the output shaft 24 via *07, G8, and Go. Also, due to the leftward movement of the sliding gear g8, the gear g8
The clutch is engaged with the high speed gear g1 and the counter shaft 22
Transmits the rotation directly to gear g7, and from gear g7-2 to G,,
It is transmitted to the output shaft 24 via G, Go. Then, when the sliding gear g8 is placed in neutral and the reverse shifter 29 is engaged with the reverse idle gear R2, the rotation of the counter shaft 22 is as follows.
Gear Cl11. R1, R2, Gt, Gg, and Go are transmitted in this order to reverse the output shaft 24.

In this way, the auxiliary transmission 4 provides two low and high speeds and reverse, and the main transmission 3 performs 5 speeds, so depending on the combination of the main and auxiliary, 10 forward speeds and 5 reverse speeds can be achieved. can do.

This power transmission device A requires a small installation space because the crank case 9, the main and sub transmissions 3 and 4, and the differential case 17 are integrally made compact. For example, in a device mounted on a four-wheeled vehicle 30 as shown in FIG.
, an integral main transmission can be used, and even if the auxiliary transmission 4 is attached to this in the axial direction, the overall structure can be made smaller. The figure is a schematic diagram of the four-wheeled vehicle, and 31 is a frame;
32 is a front wheel, 33 is a rear wheel, 34 is a seat, B is a driver, the front wheel 32 is driven by the ring gear 26, and the rear wheel 33
is driven by a propeller 27.

Since the power transmission device A is formed in a small size, the device A can be placed below the driver's line of sight C passing through the height of the upper end of the front wheels.

(Effects of the Invention) As described above, since the engine crankcase is configured as an extension of the main transmission case, the crankshaft can be brought close to the gear train of the rotating shaft inside the main transmission, and the distance between the shafts can be increased. can be extremely shortened, and the overall height can be made low.

In addition, the main and auxiliary transmissions are arranged in the axial direction, and the bearings in the intermediate case support the ends or intermediate parts of the rotating shafts of both transmissions, so the axial length of the entire transmission can be shortened. It is possible to form it in this way.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, and FIG. 2 is a side view of a vehicle implementing the present invention. 3... Main transmission 4... Sub-transmission 5...
Gear case 6... Main transmission case 7... Intermediate case 8... Sub-transmission case 9... Crank case

Claims (1)

[Claims] 1. A gear-type main transmission and a sub-transmission that transmit the rotation of the crankshaft of an internal combustion engine to an output shaft are sequentially provided, and both transmissions are housed in a gear case, and the rotating shaft is housed in the case. In the case structure of a power transmission device that is supported by a bearing, the sub-transmission is provided on an extension of the axis of the main transmission, and the gear case is formed by integrally connecting the main transmission case, the intermediate case, and the sub-transmission case. It accommodates both transmissions, with bearings provided in each case supporting the ends of the rotating shafts housed in each transmission, and bearings in the intermediate case supporting the middle part of the rotating shaft common to both transmissions. , and a main transmission case and an intermediate case are extended to form a crankcase of an internal combustion engine. 2. The case structure for the power transmission device according to item 1, characterized in that the differential case is provided integrally protruding from the end face of the auxiliary transmission case.