JPS58158315A - Air-cooled v-type engine - Google Patents

Abstract

PURPOSE:To equalize cooling for both cylinders, by increasing a supply quantity of lubrication oil to a front cylinder more than that to a rear cylinder, in an air- cooled engine whose front and rear cylinders are arranged in V-type. CONSTITUTION:A V-type engine 8 to be mounted on motorcycle is formed of a front cylinder 10 and a rear cylinder 11 arranged in about V-type keeping a predetermined including angle in a longitudinal direction, and a pistons 17 which are fitted in both cylinder are connected through a connecting rod 23 with a crankshaft 18. A caliber (r2) of an oil jet 27 provided on the connecting rod 23 and connected at a predetermined angle with an oil feed hole 21 connected with an oil duct 27 provided on the crankshaft 18 in an axial direction is formed in a larger diameter than that in the front cylinder side, in the rear cylinder 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air-cooled V-type engine mounted on a motorcycle or the like.

fiT] Cylinder Cylinder The cylinder and t1 are arranged in a roughly V-shape with a predetermined angle of inclination in the longitudinal direction. @J Warasu Engine-kP
It is particularly suitable as an engine for motorcycles.

By the way, in this 11 air-cooled V-type engine, the rear cylinder is generally cooled in between.

During t1, the Wti cylinder was cooled during the running storm, whereas the VK cylinder was cooled efficiently.
Since the s cylinder is covered with air, the running wind is blocked.
Therefore, in pigeon coops that do not take special measures to cool the rear cylinders, there is a risk that the rear cylinders will overheat more significantly, without affecting engine performance.

The present invention has been developed based on the above circumstances, and one of its advantages is that it can maintain uniform cooling of the front and rear cylinders, and improve engine performance. This is an attempt to provide a 9-cooled V-type engine that can achieve maximum performance.

That is, in the present invention, the amount r of lubricating oil supplied to the rear cylinder
, JI is also set to be larger than the amount of food supplied to the w cylinder, and the rear cylinder is? %I? ltk simple effect and 4c p1 upper purpose [this is what we are trying to achieve.

The present invention will be explained below based on a first embodiment shown in FIGS. 1 to 4.

Figure 1 shows a single-wheeled motorcycle, where 1 is a frame as a vehicle body, 2 is a front fork, 3 is a steering shaft, 4 is a fuel tank, and 5 is a seat. The frame 1 has a main structure including a head vibro and a backbone section 7 connected to the rear surface of the head vibro. An ILV type 4t cycle engine 8 is suspended and supported on the backbone gy of the 7 frames 1. This engine 8 consists of a front cylinder 10, a rear cylinder 11, and seven single units on a crankcase 9. These front cylinders 10 and Vt cylinders 11 are installed vertically at a predetermined angle in the rear direction.
The rear cylinder 11 is located at the rear of the 1Ii 1 cylinder 10.

I1+ regarding the structure of these front cylinders 10 and rear cylinders 11 for a long time! As will be explained, the inner cylinder 10.
11 is the next front cylinder 10 with the same configuration, and the same components are given the same numbers. That is, it is a 12-wire cylinder block, and has a large number of cooling fins 13 on the P1 outer fin (2), and also has the above-mentioned crankcase 9.
The cylinder 15'fc connected to the inner crank ml4 is false. A sleeve 16 is press-fitted into the cylinder 15), and a piston 17 is accommodated within this sleeve 16. Further, a crankshaft 18 is housed in the crank chamber 14, and the crankshaft 18 is disposed horizontally along the left-right direction of the vehicle body. The crankshaft 18 is not shown in the drawing, or is composed of three parts 6: a crank journal, a crank web, and a crank pin 19, and the crank journal part is supported on the crankcase 9 via a bearing (not shown). At the same time, an oil passage 20 is formed in the axial direction within the O crank mlB. And crank bin 19 has one end or crank bin 1.
90 outside Jllll-to-lower with 1 other night oil road 20
However, the oil supply hole 21 is leaking.

This crank@18 crank bin J9 has a welfare bushing 2.
2' is connected to the pick end 24 of the connecting rod 2s.
The small end 25 is connected to the piston 17 to connect the piston 11 and the crankshaft 18. The bush 2j has a communication hole 26 connected to the oil supply hole 21 of the crank bin 19, and the big end 24 of the connecting rod 2S has an oil jet hole 27 formed therein. One end of this oil spout hole 27 is connected to the oil supply hole 21 via the communication hole 26, and the other end is opened in the middle of a lever part 28 that connects to the toss small end 25. This other end-port is oriented 4Rt-inside the piston 170. In this V-type engine 8, the diameter rs k of the oil jet hole 27' of the & part cylinder 11 is larger than the diameter r3 of the oil jet hole 270 of the 1°C part cylinder 10.

The cylinder head 2 is mounted on the top surface of the cylinder block 12.
The cylinder head 29 has a combustion chamber 30 connected to the cylinder 15. Combustion*SO
An intake boat 31 and an exhaust boat S2 are provided, and these intake boats 31 and exhaust boats 32 are opened and closed by the intake pulp 11 and the exhaust pulp 34, respectively. Note that the intake pulp 33 and the exhaust pulp 34 are urged by pulp springs 35 and 35 in a direction toward the intake boat 31 and the exhaust boat 31, respectively.

At the upper end of the cylinder head 29 is a helad cover 36.
1H, and a camshaft connector g37 is formed between the cylinder head 29 and the head cover 36. The camshaft housing is 37 yen, and the camshafts 38 are arranged horizontally along the left and right sides of the unit. This camshaft 38 is connected to a gas cam 39 and an exhaust cam 40 [integrated into one body]
k intervention * air valve 33'J? and W htba A
J41 (- is designed to be driven closed.

Both ends of this camshaft 38 are valved in bearings (not shown) and are pivotally supported at the w joint between the cylinder head 29 and the head cover 36, and a driven gear 42 is attached to the w end of the cylinder head 29. Wow.

A timing chain 44 is stretched between the driven gear 42 and a drive gear 43 that is rotationally driven by the camshaft 38, and therefore the camshaft 38 is rotationally driven by the crankshaft 18.

An oil pump 45 is disposed at the bottom of the crankcase 9. This oil pump 45 is crank @1
A strainer 48 that sucks lubricating oil stored in an oil pan 47 is connected to the suction port of the pump m (not shown). The discharge port of this pump chamber is connected to both the oil passage 20 of the crankshaft 18 and the camshaft 38 through an oil supply passage valve (not shown).
Connected to 11i@branch.

In addition, the rear arm 49 is shaped like a triangular frame in Figures 1 and 2, and this rear arm 49
In addition to pivotally supporting the driving wheel 50 that can move in the shaft position in the first part of the 14i, +! 'II upper part or one C) Mk*@s
&1 is stacked by x.

Freeze code 52.5jl is a carburetor, which is installed between the WJJ part cylinder 1θ part cylinder 11.

Thus, the oil in the oil pan 47 lubricates the engine by 80% through the path t described below.

When the crankshaft 18 is rotated with the start of the engine 8, the oil pump 45 is also driven at the same time, so the pump chamber becomes negative pressure, and the oil in the oil pan 47 yen flows through the strainer 48 yen C. is sucked into the pump chamber.

This sucked oil is gradually increased in pressure and pumped from the discharge port to the crank @ 18 and both cylinders 10, respectively.
11 camshaft 38.38.

The oil pumped to the camshaft 38 slides on the shaft portion tS of the camshaft 38, and then jets out from this shaft portion into the camshaft housing w1137. This jetted oil adheres to the inner surfaces of the cylinder head 29 and head cover 36 to prevent them from being cooled, and also to the intake valve 33, exhaust pulp 34, camshaft 38, rocker arm 41, and other valve mechanisms. Adhere to these 'f:,@smooth cooling. Thereafter, the oil that has been completely cooled in each part is returned to the oil pan 47FPg via an oil return passage (not shown).

-The lubricating oil that has been pressure-fed to the crankshaft 18 is guided to the shaft support of the crankshaft 18 and flows there, and also passes through the oil passage 20 km of the crankshaft 18 to the oil supply hole 2. It's being pumped.

Due to the centrifugal action accompanying the rotation of the crankshaft 18, this lubricating oil flows from the communication hole 26 into the oil jet hole 27, and from this oil jet hole 21 to the piston 17 as shown by the arrow in Figures 3 and 4. It sprays out towards the inside of the sleeve 16 (DFEJmEIll and piston 17) and completely cools them.
Ha, IIJ! ll cylinder l0E) Oil spout hole 270
``Because it belongs to greatness rather than wealth, the amount of oil jetted out from this oil jetting hole 27' is larger9. Therefore, in the rear cylinder 11, the inside of the piston 17 in the inner wall of the sleeve 16 is The amount of oil that adheres to the engine increases substantially.This oil drops into the cooled crankcase 9 and breaks into the oil pan again.

Since the diameter of the oil jet hole 27' of the rear cylinder 11 is larger than that of the cylinder 10, the amount of oil supplied to the rear cylinder 111& is larger than that of the cylinder 10. Therefore, compared to the front cylinder 10, the rear cylinder 11 can be cooled more efficiently.

Therefore, does it depend on the driving wind? 11r4J11xI, the front cylinder 10 and the rear cylinder 110 are approximately balanced, and the front cylinder 1 is based on the difference in cooling performance.
It is possible to eliminate the imbalance between the cutting edge characteristics of the rear cylinder 11 and the cutting edge characteristics of the rear cylinder 11.

In addition, in the first embodiment described above, the diameter of the oil jet hole was increased as a means to increase the amount of oil supplied to the rear cylinder, but the present invention is not limited to this first embodiment, and the present invention is not limited to this first embodiment. It may be configured as shown in the second embodiment.

That is, in this second embodiment, among the oil supply passages 61, 62 connecting the discharge port of the oil supply lid 45 and the camshafts 38, 38 of the front cylinder 10 and the rear cylinder horn, the oil supply passage for the cylinder 11 is The caliber of 62mm is larger than that of the front cylinder 10@, making it 94mm in diameter. According to this 1jPI2 embodiment, the front cylinder 1
Since the cooling efficiency of the valve mechanism of the rear cylinder 1 is the same as that of the rear cylinder 10, as in the above-mentioned embodiment 11, both cylinders 10
．． 11 threshold +lv rejection effect imbalance can be resolved.

In addition, for an anastomosis in which the oil supply to the valve mechanism differs in this way, the diameter of the oil supply passage of the ^7 cylinder is kept the same, and an orifice kN is placed in the middle of the oil supply passage of the -14 cylinder. In addition to accommodating the oil supply lid to the front cylinder, the structure may be such that the amount of oil supplied to the upper and rear cylinders is increased.

Furthermore, 4 above! In the embodiment, the amount of oil supplied to either the crankshaft or the camshaft was increased, but the oil supply M' to both the crankshaft and the camshaft may be set to be large.

The present invention described in detail above is! ! rJ part cylinder cylinder [Arranged in a roughly V shape with a predetermined included angle in the foreground direction, in the air-cooled V-shaped construction/gin, the cylinder is connected to the swing part cylinder.
The oil supply lid is larger than the amount of oil supplied to the front cylinder when it is ON. According to this, compared to the llIJ cylinder, the latch of the rear cylinder is more efficient due to the lubricating of the rear cylinder. Overheating of the cylinder is suppressed. Therefore, cooling by cooling air means that the cooling of the A11 cylinder and the rear cylinder is approximately equal. The unbalance of the engine can be eliminated and the engine performance can be fully demonstrated.

[Brief explanation of the drawing]

1 to 4 show a first practical example of the present invention, 18
Figure 1 is a side view of the motorcycle, Figure 2 is a side view of the engine area, Figures 3 and 4 are side views of the engine partially cut away, and Figure 5 is a side view of the motorcycle. FIG. 2 is a partially cross-sectional view showing the second embodiment. 8... V-type engine, 10... Front cylinder, 11
...Rear cylinder.

Claims (1)

[Scope of Claims] The wound cylinder and the rear cylinder are formed into a substantially ■-shaped VC & space with a constant included angle KFli in the front-rear direction, and lv oil is supplied to each lubricating part of the front cylinder and the rear cylinder. In the air-cooled V-type engine, the amount of lubricating oil supplied to the upper rear cylinder is larger than the amount of lubricating oil supplied to the front cylinder.