JPH01249919A - Engine unit for automobile - Google Patents

Abstract

PURPOSE:To elongate the distance from the center of a clutch to the undersurface of an oil pan by arranging an output taking-out shaft having a clutch, over a crankshaft. CONSTITUTION:When an engine 5 is started, the revolution of a crankshaft 5c is transmitted from an output gear 17 to an output taking-out shaft 15, and further inputted into a transmission 6 through a clutch 11, and transmitted to a front axle 7 through a differential gear device 8. Since the clutch 11 is installed onto the output taking-out shaft 15, the clutch 11 can be shifted to wards the side of the crankshaft 5c, and the distance from the center of the clutch 11 to the undersurface of the oil pan of a crankcase 5b can be increased. Therefore, the projection of the clutch 11 in the axial direction can be suppressed by avoiding the superposition of the thick part and the crankshaft 5c in the axis line direction at the center of the clutch 11, and even if the outside diameter of the clutch 11 is increased, the downward projection of the outer peripheral part from the undersurface of the oil pan is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an engine unit for an automobile.

[Conventional technology]

In recent years, in order to make the engine compartment smaller and the cabin more spacious and comfortable, the engine has been arranged so that the crankshaft faces the width of the vehicle, and the output of this engine has been connected to a clutch installed at one end of the crankshaft. A structure in which the front wheels are driven by taking the engine out through the engine is widely used.

[Problem to be solved by the invention]

However, in such a structure, since the clutch and the crankshaft are arranged side by side in the crankshaft direction, there is a problem that the engine unit becomes long in the crankshaft direction.

Therefore, in order to solve this problem, we installed a rotating shaft that takes out the output from the crankshaft, and on this rotating shaft, we installed a clutch with a thicker outer diameter (thus making it thinner in the axial direction without reducing the capacity). This is conceivable, but doing so would cause the outer periphery of the clutch to protrude below the oil pan, causing the inconvenience of raising the engine height.On the other hand, in automobiles, in order to obtain good forward visibility, the engine hood is closed. In order to reduce the height, it is preferable for the engine height to be low.The present invention was made in view of these circumstances. The purpose of this project is to provide an engine unit for

[Means to solve the problem]

In the automobile engine unit according to the present invention, an output output shaft is pivotally supported on the side of a crankshaft in which an output gear is formed by a crank arm, and the output output shaft is provided with a gear and a clutch that mesh with the output gear. The output output shaft is placed above the crankshaft.

[Effect]

In the present invention, since the clutch is arranged offset from the crankshaft, it is possible to avoid overlapping the central thick portion with the crankshaft in the crankshaft direction. Furthermore, since the distance from the center of the clutch to the lower surface of the oil pan becomes longer, even if the outer diameter of the clutch is increased, the outer peripheral portion will not protrude below the lower surface of the oil pan.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially cutaway side view of an automobile engine unit according to the present invention, FIG. 2 is a sectional view taken along line n-1 in FIG. 1, and FIG. 3 is a plan view showing the engine compartment of the automobile. FIG. 4 is also a side view.

In FIGS. 3 and 4, the reference numeral 1 indicates an engine compartment located at the front of the vehicle body. Inside this engine compartment l, a horizontal engine unit 3 for driving the front wheels 2 is installed with a crank. It is mounted with the axis facing the width direction of the vehicle. 4 is an engine hood that covers the upper part of the engine compartment 1.

The engine unit 3 is an integral combination of an engine 5, a transmission 6, and a differential gear device 8 provided on a rear front axle 7. The differential gear device 8 is arranged behind the engine 5. ing. The transmission 6 is disposed on the side of the engine 5 and connects the engine 5 and the differential gear device 8.

11 is a clutch interposed between the engine 5 and the transmission 6.

The engine 5 is a multi-cylinder in-line engine that uses a dry sump method as a lubrication method, and has a crankcase 5b that is divided into upper and lower parts by a mating surface 5a that is inclined toward the front end, and an axis extending in the vehicle width direction between the upper and lower crankcases 5b. A cylinder block 5d has a supported crankshaft 5C, a cylinder block 5d extending rearward from the crankcase 5b and holding pistons connected to the crankshaft 5C, and a cylinder block 5d that closes the upper part of the cylinder block 5d to hold pistons and cylinders. Block 5
It is composed of a cylinder head 5e which together with d forms a combustion chamber. An intake valve 12 and an exhaust valve 13 are held in the cylinder head 5e so as to be movable up and down, and a camshaft 14.degree. 14 for driving these valves is pivotally supported. The crankcase 5b has a shallow oil pan directly below the crankshaft, and in front of it is an oil tank 1 that stores lubricating oil.
9 are integrally provided.

Reference numeral 15 denotes an output output shaft that takes out the output of the crankshaft 5C. This output output shaft 15 is located on the side of the crankshaft 5C, and parallel to the crankshaft 5C, is connected to the mating surface 5a and the axis.
It is pivoted to match.

In other words, the output output shaft 15 is located forward and above the crankshaft 5C. This output output shaft 1
A gear 16 is provided on the gear 5.

This gear 16 is integrally formed with a tooth plate part 16a forming a gear and a boss part 16b spline-fitted to this output extraction shaft 15, and is formed by one of the crank arms of the crankshaft 5C. The output gear 17 meshes with the output gear 17, and is driven with a slight deceleration. And crankshaft 5C
Of the crank arms, the crank arm furthest from the crank arm having the output gear 17 is formed in a circular shape. In this embodiment, since the fourth crank arm from the center of FIG. 2 is the output gear 17, the leftmost crank arm is circular, and the torsion of the crankshaft 5C is attached to the outer periphery of this crank arm. Damper 2 to suppress vibration
1 is provided. This damper 21 consists of a rubber ring 21a fixed to the outer periphery of the crank arm and a mass ring 21b fixed to the outside thereof.

22 is a timing gear provided integrally with the boss portion 16b of the gear 16. An intermediate shaft 23 is pivotally supported above the timing gear 22 along the cylinder axis and on the upper side of the cylinder block 5d.
4 and a second gear 25 are mounted on the shaft. And the first
A first chain 26 is connected between the gear 24 and the timing gear 22.
The second gear 25 and the driving gear 27 provided on the camshaft 14 are connected by a second chain 28. This second chain 28 extends in the front-rear direction above the cylinder block 5d.

The clutch 11 is a dry single plate type friction clutch,
A flywheel lla fixed to the left end of the output extraction shaft 15 with respect to the vehicle body, a clutch disc llb, a pre-7 shear plate 11C that clamps the clutch disc llb between the flywheel lla, and a flywheel lla. It consists of a clutch cover lid that is fixed and supports the pressure plate 11C so as to move forward and backward, and a spring lie that moves the pressure plate 1-11c back and forth. The clutch disc llb is equipped with a coil spring llf that buffers and absorbs fluctuations in the load applied to the engine due to unevenness of the road surface on which the vehicle travels. Also, on the outer circumference of the flywheel lla, a ring gear 29 is connected to a starter motor (not shown) when starting the engine.
is fixed. On the other hand, lubricating oil pumps 31 and 31 are mounted on the right side of the vehicle body of the output shaft 15, and a water pump 32 is connected to the outside thereof. Reference numeral 33 denotes an auxiliary drive pulley having a pair of belt grooves mounted on the protruding end of the rotating shaft of the water pump 32. The first belt 34 is attached to the inner groove of the auxiliary drive pulley 33, and the alternator 35 and the idler pulley 36 are hooked thereto. A second belt 37 is attached to a groove on the outside of the auxiliary drive pulley 33, and is passed through a compressor 38 for an air conditioner and a pump 39 for power steering. Here, the alternator 35 is disposed in a space above the line connecting the output output shaft 15 and the crankshaft 5C, and the alternator 35 and the pump 3
9 is arranged in a space below the connecting line. Note that 41 is an intake pipe connected to the cylinder head 5e;
2 is an air cleaner connected to the upstream side of the intake pipe 41. Further, 43 is the axis of the drive shaft of the transmission 6,
The drive shaft and the differential gear device 8 are connected by a large-diameter tooth cover 44.

In the automobile engine unit configured as described above, when the engine is started, the rotation of the crankshaft 5C is transmitted from the output gear 17 to the output output shaft 15. The signal is then input to the transmission 6 via the clutch 11, changed speed, and then transmitted to the front axle 7 via the differential gear device 8.

Further, since the clutch 11 is provided on the output output shaft 15, it is possible to shift the clutch 11 to the side of the crankshaft 5C and increase the distance from the center of the clutch to the lower surface of the oil pan of the crankcase 5b. Therefore, it is possible to prevent the clutch 11 from protruding in the crankshaft direction by avoiding the thick part in the axial direction at the center of the clutch and the crankshaft 5C from overlapping in the crankshaft direction, and to increase the outer diameter of the clutch, Even with a structure in which the clutch capacity is obtained by a small number of friction members, it is possible to prevent the outer peripheral portion from protruding downward from the lower surface of the oil pan. As a result, not only can the clutch 11 be constructed so as not to protrude in the crankshaft direction as much as possible, but also it is possible to prevent the clutch 11 from protruding downward from the engine.

〔Effect of the invention〕

As explained above, according to the present invention, an output output shaft is pivotally supported on the side of the crankshaft in which the output gear is formed by the crank arm, and the output output shaft is provided with a gear and a clutch that mesh with the output gear. Since the output output shaft is arranged above the crankshaft, the clutch can be arranged offset from the crankshaft, and the distance from the center of the clutch to the lower surface of the oil pan can be increased.・Therefore, it is possible to prevent the clutch from protruding in the direction of the crankshaft by avoiding the central part of the clutch from overlapping with the crankshaft.In addition, the outer diameter of the clutch is increased, and the clutch capacity can be obtained from a small number of friction members. Also, the outer peripheral portion can be prevented from protruding downward from the lower surface of the oil pan. As a result, even if the clutch is constructed so that it does not protrude as much as possible in the direction of the crankshaft, the clutch will not protrude downwards from the engine, making it possible to shorten the engine in the direction of the crankshaft while suppressing the height of the engine. can.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of an automobile engine unit according to the present invention, FIG. 2 is a sectional view taken along line nn of FIG. 1, and FIG. 3 is a plan view showing the engine compartment of the automobile. , FIG. 4 is a side view as well. 5...engine, 5a...mating surface, 5b...
・Crankcase, 5C...Crankshaft, 15...
...output extraction shaft, 16...gear, 17...output gear, 11...clutch, lla...flywheel. Patent applicant Yamaha Motor Co., Ltd.

Claims (1)

[Claims] An output extraction shaft for taking out the output of the crankshaft is supported parallel to the side of the crankshaft where the output gear is formed by the crank arm, and a gear and a clutch that mesh with the output gear are provided on this output extraction shaft, and the output An automotive engine unit in which the extraction shaft is located above the crankshaft.