JPS6075723A - Power take-out system for multi-cylinder engine - Google Patents

Abstract

PURPOSE:To stabilize gearing by securing a bearing holder of cover-shape to the outside of crank case while supporting the crank shaft sections at the opposite sides of crank gear contained in said holder on the crank case and bearing holder. CONSTITUTION:An engine is provided with two parallel crank shafts where crank gears 20, 21 provided at the leading edge of each crank shaft 1 are coupled through large gears 25, 26 to single inverted shaft 12. Here, a cover-shaped bearing holder 16 is secured to the outside of crank case 7 to contain the crank gears 20, 21 and large gears 25, 26 in the bearing holder 16. First gear 20 will support the crank shaft sections 1 at the opposite sides by means of crank case 7 and bearing holder 16 through bearings 4, 17. The large gears 25, 26 are coupled through a rubber damper 29 to the flange shaft 15 which is supported through a bearing 30 by the sidewall section 16a of bearing holder 16.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a power extraction device for a multi-cylinder engine equipped with two parallel crankshafts.

Generally, this type of engine power extraction device connects the crank gear of each crankshaft to one driven shaft via a large gear.

(Prior art) The driven shaft portions on both sides of each crankshaft and large gear are supported on both sides by the crankcase as a whole, but the crank gear and large gear fixed to the end of the crankshaft are supported in a cantilevered manner. It is supported as follows. However, if the crank gear is supported in a cantilevered manner and meshed with the large gear, the meshing between the crank gear and the large gear is likely to become unstable due to deflection of the shaft, and the gears and bearings may become damaged due to rotational fluctuation torque of the crankshaft. Damage or loud noise may occur.

(Objective of the invention) It is an object of the present invention to prevent damage to the crank gear and bearings and to reduce gear noise by stabilizing the meshing between the crank gear and the large gear.

(Structure of the Invention) (1) A cover-shaped bearing holder is fixed to the outside of the crankcase, (2) both crank gears and a large gear are housed in a cover-shaped bearing holder, and (3) the crank The crankshaft portions on both sides of the gear and the driven shaft portions on both sides of the large gear are supported by the crankcase and the bearing holder via shafts.

(Example) In FIG. 1 showing a schematic overall cross-sectional view of a two-cylinder two-cycle engine, the engine is m1. 2nd crank 1, 2
The crankshafts 1 and 2 are supported by the crankcase 7 through bearings 3, 4, 5, and 6, respectively. Piston 8 connected to each crankshaft l, 2
．． 9 are respectively @1, fA'r, 2 cylinders 10. llIC
Mated tail. 12 C output shaft (driven shaft)-C,
IIQl is arranged parallel to the crankshaft 1.2 and
C is supported by the crankcase 7 via the
There is.

A cover-shaped bearing 16 is fixed to the outside of the crankcase 7, and each crankshaft 1 is connected to a bearing 16 in the form of a cover.

2 extends into the bearing holder 16, and its distal end is supported by the bearing holder 16 via bearings 17 and 18, respectively. 1st. The second crank gears 20 and 21 are housed in the bearing holder 16, and the first and second crank gears 20 and 21 are housed in the bearing holder 16, respectively.
It is fixed to the second crankshaft 1.2. That is, in the first crank gear 2o, the crankshaft 1 portions on both sides are connected to the bearings 4, 1.
It is supported by the crankcase 7 and the bearing holder 16 via the crank case 7 and the bearing holder 16 . Further, the second crank gear 21 is supported by the crankcase 7 and the bearing holder 161 through the bearings 6 and 18 at both crankshaft 2 portions.

A clutch cover 23 is fixed to the outside of the bearing holder 16, and the output φ1lI12 is connected to the bearing holder 1.
6 and extends into the clutch cover 23. A clutch mechanism 36 including a clutch housing 37 and the like is housed within the cover 23.

In FIG. 2, which is an enlarged view of the section ■ in FIG. 2nd large gear 2
5.26 are rotatably fitted through bearing metals 27.28, the first large gear 25 meshes with the first crank gear 20, and the second large gear 26 meshes with the second crank gear 21. . Both gears 25 and 26 are connected to the flange cylinder 15 via a cylindrical rubber damper 29. The flange cylinder 15 has the bearing 3 attached to the side wall 16a of the bearing holder 16.
0, and is fitted to the protruding J-shaft 12 via a bearing metal 31 on its inner circumferential surface. Further, the rubber damper 29 is fitted onto the outer periphery of a plurality of boss portions 32 formed on the flange portion 15a of the flange tube 15, and is engaged with the through hole 34 of the large gear 25.26. 3
Reference numeral 3 denotes an annular plate for preventing falling off, which is fixed to the boss portion 32 with rivets 35.

The flange l'+) 15 extends into the clutch cover 23, and a clutch housing 37 is spline-fitted into the inside of the cover 23 so as to be able to rotate integrally therewith. The clutch housing 37 is locked by a locking ring 38 so that it cannot move in the axial direction. Clutch hub 39 has output 1I
It is fixed to the tip of T1+112, and is connected to the clutch housing 37 via a plurality of driven plates and friction plates so that it can be turned on and off.

42 is a pressure grate, which fits into the hub 39 and is moved in the clutch engagement direction (
It is biased in the direction indicated by the arrow. 44 is a release bearing, 45 is a release sleeve, and the release sleeve 45 is fitted and supported on the inner periphery of the output shaft 12 so as to be slidable in the axial direction via a bearing metal 46, for example, by rotating the release cam rod 47. , a movement operation is performed in the direction of the opposite arrow.

(Function) In Fig. 1, when both crankshafts 1.2 rotate, the power of each shaft 1, 2 is transferred to the crank gear 20.21° large gear 25,
26, the rubber damper 29, the flange cylinder 15, and the clutch mechanism 36 to be transmitted to the output shaft 12.

(Effects of the Invention) (1) Since the crankshaft portions on both sides of each crank gear and the driven shaft portions on both sides of the large gear are supported by the crankcase and the bearing holder via bearings, the crank gear The meshing between the large gear and the large gear on the driven side is stable.

This prevents damage to gears, bearings, etc., and reduces gear noise.

(2) Since the crank gear and the large gear are housed in a cover-shaped bearing holder, gear noise can be prevented from leaking to the outside. Further, by providing a clutch cover on the outside of the bearing holder and rubbing it to form a clutch chamber, the effect of preventing leakage of gear noise is further improved.

[Brief explanation of the drawing]

・:TS FIG. 1 is a schematic overall cross-sectional view of a two-cylinder two-cycle engine to which the present invention is applied, and FIG. 2 is an enlarged detailed view of portion 11 of FIG. 1. 1.2...Crankshaft, 4°6.14
．． 17, 18.30... Bearing, 7... Crank case, 12... Output shaft (driven side shaft), 16... Bearing holder, 20.2 Crank gear Fig. 1 n

Claims (1)

[Claims] In a power extraction device for a multi-cylinder engine, which has two parallel rank shafts, each crankshaft has a crank gear at its tip, and both crank gears are connected to one driven shaft via a large gear. A cover-shaped bearing holder is fixed to the outside of the case, and both crank gears and the large gear are housed in the cover-shaped bearing holder. A power extraction device for a multi-cylinder engine, characterized in that the following are supported by a crankcase and a bearing holder in a dual-supported manner via bearings.