JPH04278893A - Engine mount structure - Google Patents

Abstract

PURPOSE:To reduce the inclination of an engine for a car body frame by supporting the rear side of the engine through a rubber mount, when the engine equipped with hanger brackets at two places an the front side and one place on the rear side, on a car body frame. CONSTITUTION:Hanger brackets 60-62 are projectingly installed at two places an the front side and at one place on the rear side of the left and right cases 40 and 41 of the engine of a foldable type motorcycle. Accordingly, the brackets 60 and 61 at two places on the front side are projectingly installed upwardly on the upper walls of the left and right cases 40 and 41, respectively, and the hanger bracket 62 at one place on the rear side is formed to the right side case 41, and projectingly installed in the same direction at the rearward aslantly downward position from a countershaft 54. The front side of the engine is suspended through elastic members 66 and 67 on the brackets 60 and 61 on a bolt shaft 63 fixed on the rear frames 18 and 19, and as for the rear side of the engine, both the edges of a bolt shaft 64 which is integrally fixed with the bracket 62 are supported by the rear frames 18 and 19 through elastic members 68 and 69.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine mount structure for a motorcycle.

0002

2. Description of the Related Art The structure for mounting an engine on a frame of a motorcycle is generally a rubber mount at a hanger bracket protruding from the engine side (for example, Japanese Patent Laid-Open No. 1-141189).

[0003] Incidentally, although hanger brackets for an engine are normally provided in pairs on the left and right at predetermined front and rear positions, it may be impossible to provide them in pairs on the left and right depending on the shape of the engine. Especially on the rear side of the engine, there is a transmission etc., and the case has a complicated shape, so it is often difficult to install hanger brackets in pairs on the left and right, so the rear side is suspended with a single hanger bracket. Sometimes.

0004

[Problem to be solved] However, the rear side of the engine is 1
Since it is attached to the vehicle body frame by rubber mounting on the engine side using hanger brackets, the angle at which the engine swings from side to side relative to the vehicle body around the hanger brackets is large, and is amplified at the left and right ends of the engine. Vertical movement increases.

[0005] Therefore, when power is transmitted by a belt or chain, especially in the case of a belt transmission mechanism, the drive side pulley is located at the end of the engine with a large inclination, and one driven side pulley is pivotally supported on the vehicle body. There is a problem in that the adjustment of the belt tension of the belt that is stretched between both pulleys becomes incorrect, which reduces the durability of the belt and shortens its life.

[0006] The present invention has been made in view of the above points, and its object is to provide an engine mount structure that reduces the inclination of the engine with respect to the vehicle body frame.

[0007]

[Means and Operations for Solving the Problems] In order to achieve the above object, the present invention provides a structure for mounting an engine on a vehicle body frame, which includes two hanger brackets on the front side and one hanger bracket on the rear side. This is a motorcycle engine mount structure that is attached to the vehicle body frame by a rubber mount.

[0008] Since the rear side of the engine is attached to the vehicle body frame by a rubber mount, the swinging of the engine from side to side with respect to the vehicle body frame is suppressed, and there is little effect on the power transmission mechanism.

[0009]

[Embodiment] An embodiment of the present invention illustrated in FIGS. 1 to 6 will be described below. The folding motorcycle 1 has a body frame consisting of a pair of left and right front frames 2 and 3 that support a steering system including a front wheel FW, and a pair of left and right rear frames 18 and 19 that support a drive system including a rear wheel RW. Be prepared. The front frames 2 and 3 each include a left and right pair of elongated plate-like members in the front and rear, and a head pipe 4 is provided between the front ends thereof.

A lower steering shaft 5 extends through the head pipe 4 and is rotatably held therein. An upper steering shaft 6 is pivotally connected to the upper end of the lower steering shaft 5.
A front fork 8 is fixed to the lower part of the vehicle via a bottom bridge 7, and a front wheel FW is pivotally supported by the front fork 8.

The upper steering shaft 6 is rotatably held by an upper arm 9, and a handle holder 10 is pivotally connected to the upper end of the upper steering shaft 6. A pair of left and right handlebars 11 are foldably assembled by the handle holder 10. There is. A headlight cover 12 is provided to cover the head pipe 4, and a headlight 13 is fixed to the front opening of the headlight cover 12.

A pair of brackets 14 are provided upright on the left and right sides of the head pipe 4, and the upper arm 9 is pivotally supported at the upper end of the brackets 14 by a pin 16. Note that the pin 16 is coaxial with the connecting support shaft between the lower steering shaft 5 and the upper steering shaft 6.

A pair of brackets 15 are also provided at the front positions of the left and right front frames 2 to protrude upward, and the circular holes formed in the brackets 15 are provided with upper arms 9.
A lock pin 17 is slidably attached to a rearwardly extending portion of the lock pin 17 and is fitted into the lock pin 17 during assembly.
The upper arm 9 further extends rearward and diagonally downward.

On the other hand, the rear frames 18 and 19 are composed of a pair of left and right plate members that support the engine 20 and the rear wheels RW, etc., with a fuel tank 21 and an oil tank 22 disposed between the upper halves thereof, and a central part of the rear frames 18 and 19. An exhaust muffler 23 is disposed diagonally between the two. The rear wheel RW is pivotally supported by the ends of rear frames 18 and 19 that extend diagonally downward to the rear, and the engine 20 is suspended below the front frame 3 between the front wheel FW and the rear wheel RW.

A pair of front and rear rollers 23 pivotally supported on the outer surfaces of the upper sides of the rear frames 18 and 19 fit into guide rail grooves 24 provided on the inner surface of the front frame 2 and are oriented in the front-rear direction. The front frames 2 and 3 are in contact with each other so that the front frames 2 and 3 can move back and forth with respect to the rear frames 18 and 19. A joint arm 27 connects the rear end of the upper arm 9 and the front ends of the rear frames 18 and 19 by pivotally connecting both ends thereof.

A seat 32 is supported above the rear portion of the front frame 2 via front and rear links 30 and 31, each consisting of a pair of left and right legs, so as to be able to rise and fall.

The links 30 and 31 are pivotally supported on the lower surface of the seat 32, the lower ends of the left and right legs of the front link 30 are supported by a support shaft 33 at the rear of the upper sides of the rear frames 18 and 19, and the rear link 31 is The lower ends of the left and right legs are supported by the support shaft 34 at the rear ends of the front frames 2, 3, and when assembled with the front frames 2, 3 in the forward position relative to the rear frames 18, 19 (Fig. 2), link 30,
The lower end of the seat 31 is contracted, and both links 30 and 31 are made to stand up, fixing the seat 32 at a high position. On the other hand, when folding,
The lower ends of the links 30 and 31 are widened, and the seat 32 is housed in a low position. Note that flat openings 28 and 29 are formed at front and rear positions on the side surfaces of the front frames 2 and 3 to serve as grips.

The general structure of the folding motorcycle 1 is as described above, and when assembled in which the front frames 2 and 3 are moved forward with respect to the rear frames 18 and 19, the lower steering shaft 5, The upper steering shaft 6 and the handle holder 10 are coaxially connected in a straight line, and the seat 32 is in a high position so that the vehicle can travel.

Then, when the lock pin 17 is removed and the front frames 2 and 3 are moved rearward with respect to the rear frames 18 and 19, the upper arm 9 is attached to the pin 1 as shown in FIG.
The seat 32 is folded rearward around the center point 6 and falls horizontally together with the handle holder 10, and the seat 32 is lowered and stored in a low position. When the handlebar 11 is folded, it becomes the folded state shown in FIG. 3, which reduces the longitudinal length of the vehicle body and lowers the vehicle height, resulting in a compact shape that is convenient for transportation.

In the folding motorcycle 1 having the above-described structure, the engine 20 suspended on the rear frames 18 and 19 has a belt control mechanism and a transmission mechanism integrated into it, as shown in FIGS. 3 and 4. , is housed in a left side case 40 and a right side case 41, which are divided into two along the width direction center line XX.

A cylinder 42 is provided diagonally upwardly protruding forward, and a crankshaft 45 connected to a piston 43 in the cylinder 42 via a connecting rod 44 is supported rotatably in the left-right direction. AC on the right side
A generator 46 is provided, and a drive pulley 47 with a variable diameter is provided at the left end of the crankshaft 45. A driven pulley 48 having a variable diameter is also located close to the drive pulley 47, and a V-belt 49 is spanned between both pulleys 47 and 48.

The driven pulley 48 transmits rotation to the driven shaft 51 via the clutch 50. The belt control mechanism between the pulleys 47 and 48 is covered from the left side by an engine cover 59.

The right end of the driven shaft 51 protrudes rightward from the left case 40 and is located in the mission chamber formed by the right case 41, into which a gear 52 is fitted.
Rotation is transmitted to the counter shaft 54 through the gears 55 and 56, and further to the final drive shaft 57 through the gears 55 and 56. The final drive shaft 57 is located on the right side case 4.
A drive pulley 58 is fitted to the end of the drive pulley 58, which protrudes to the right from the drive pulley 1.

In the engine having the above structure, hanger brackets 60, 61, and 62 are protruded from two places on the front side and one place on the rear side of the left and right cases 40 and 41, respectively.

[0025] Two front hanger brackets 60, 6
1 is located approximately above the driven shaft 51 and is located symmetrically with respect to the central axis X-X in the width direction, that is, the left and right cases 40, 4
1 is provided to protrude upward from the upper wall of each. On the other hand, one hanger bracket 62 on the rear side is attached to the right side case 4.
1, and is positioned rearward and diagonally downward from the counter shaft 54 and protrudes in the same direction (see FIG. 3). Therefore, it is slightly shifted to the right with respect to the center line XX.

Even if hanger brackets are provided on the left and right sides at the rear of the engine 20, the left and right widths are small at the rear of the cases 40 and 41, and the distance between the hanger brackets is narrow, so there is little point in providing them at two locations. Also, since the rear end of the left case 40 is located forward of the rear end of the right case 41, the hanger bracket 62 on the rear side has to protrude significantly rearward, which increases the weight. One location is provided in case 41.

The rear frames 18 and 19 on which the engine 20 is suspended have a lower side of the left rear frame 18 in an arc shape along the rear outer peripheral wall of the engine cover 59, and the front and rear ends thereof protrude to form a bracket. 18a, 18
Brackets 19a and 19b are also formed on the right rear frame 19 in symmetry with the brackets 18a and 18b, and two positions on the front side of the engine 20 are formed on the straight line connecting the pair of front brackets 18a and 19a. The hanger brackets 60 and 61 are located, and the rear bracket 18
The engine 20 is arranged so that one hanger bracket 62 on the rear side is located on the straight line connecting the points 19b and 19b.
(See Figure 5).

FIG. 5 is a partially omitted plan view showing the arrangement of the engine 20 mounted on the vehicle body. Rear frame 18, 1
9 is a connecting portion 18c that protrudes from each other at the rear end position of its upper side.
, 19c are connected to each other, and the front portions protrude from each other to support the joint arm 25.
are connected to pivotally support the end of the joint arm 25.

The brackets 18a, 19a, 18b, 19b of the rear frames 18, 19 are provided with cylindrical portions 18e, 19e, 18f, 19f that protrude inwardly, and are installed between the front cylindrical portions 18e, 19e. Hanger brackets 60 and 61 at two locations on the front side of the engine 20 are supported on the bolt shaft 63, which is attached to the rear cylindrical portions 18f and 19.
The rear side 1 of the engine 20 is attached to the bolt shaft 64 installed between f.
The bolt shaft 63 at the location is supported (see FIG. 6).

Note that the final drive shaft 5 protrudes to the right from the right case between the bolt shaft 63 and the bolt shaft 64.
A drive pulley 58 is fitted to the end of the wheel 7, and a belt 81 is stretched between the drive pulley 58 and a driven pulley 80 fixed to the hub of a rear wheel RW that is pivotally supported by one rear axle 82. ing. The rotation of the final drive shaft 57, which is the output shaft of the engine 20, is transmitted to the rear wheel RW via the belt 81.

The arrangement of the engine and the positions of the hanger brackets 60, 61, 62 are as described above, and the structure of the engine mount section will be explained in detail below with reference to FIG.

FIG. 6 is a plan view showing only the essential parts of the engine mount, with the engine main body omitted. Of the cylindrical portions 18e and 19e protruding toward each other from the brackets 18a and 19a of the rear frames 18 and 19, the left cylindrical portion 18e is formed with a female thread, and the right cylindrical portion 19 is formed with a female thread.
The bolt shaft 63 passes through the circular hole formed in the left side cylindrical portion 18e and is screwed into the female thread of the left cylindrical portion 18e, so that the bolt shaft 63 is installed and fixed to the rear frames 18 and 19.

A collar 65 is penetrated and supported at the center of the bolt shaft 63, and the cylindrical portion of the hanger bracket 60 on the engine 20 side is attached between the collar 65 and the bracket 18e with a cylindrical elastic member 66 interposed inside. Similarly, a hanger bracket 61 is attached via an elastic member 67 between the collar 65 and the bracket 19e.

Therefore, the front side of the engine 20 is suspended from a bolt shaft 63 fixed to the rear frames 18 and 19 by being rubber-mounted at hanger brackets 60 and 61 on the engine 20 side.

On the other hand, the cylindrical portions 18f and 19f protruding toward each other from the rear brackets 18b and 19b have inner openings with slightly smaller inner diameters, and cylindrical elastic members 68 and 69 are fitted from the outside. , a bolt shaft 64 is supported via elastic members 68 and 69.

The elastic members 68 and 69 are inner cylinders 68a and 69a.
Rubber elastic bodies 68b, 69 are provided between the outer cylinders 68c, 69c.
b is inserted, and when inserted into the cylindrical parts 18f, 19f, the inner cylinders 68a, 69a protrude slightly inward from the inner openings of the cylindrical parts 18f, 19f, and both the inner cylinders 68a, 69a
The left and right collars 70 and 71 are sandwiched between them, and the left and right collars 7
The rear hanger bracket 6 of the engine 20 between 0 and 71
2 is sandwiched between the bolt shaft 64 and the elastic members 68, 69,
It passes through the collars 70, 71 and the hanger bracket 62, and a nut 72 is screwed onto the end of the bolt shaft 64 that protrudes leftward from the elastic member 68 via a washer 73 and tightened.

The hanger bracket 62 is sandwiched between collars 70 and 71 on both sides, and is further sandwiched between collars 70 and 71.
1 is sandwiched between inner cylinders 68a and 69a of rubber elastic bodies 68 and 69, and bolt shaft 64 and nut 72 are inserted from the outside.
The hanger bracket 62
is integrally fixed to the bolt shaft 64. and bolt shaft 6
4 itself is connected to the rear frame 1 via elastic members 68 and 69.
Supported by 8.19.

That is, the rear side of the engine 20 is
The left and right ends of the bolt shaft 64, to which the hanger bracket 62 is fixed and integrated, are rubber mounted and suspended from the brackets 18b, 19b on the rear frames 18, 19 side.

Therefore, the distance between the left and right rubber mounts is large, the left and right rocking of the engine 20 with respect to the rear frames 18 and 19 is suppressed, and the rocking of the drive pulley 58 is also small, and the shaft support on the rear frames 18 and 19 is reduced. The tension adjustment of the belt 81 suspended between the driven pulley 80 and the driven pulley 80 is not disturbed. Therefore belt 8
It can improve the durability of 1 and extend its lifespan.

In this embodiment, the power is transmitted by the belt 81, but even if this is a chain transmission mechanism, large left and right swings of the drive sprocket are undesirable as it affects durability. , applying the mount structure of the present invention has certain effects.

In the embodiment described above, the engine is rubber mounted on the front side of the engine using hanger brackets 60 and 61, but this may be rubber mounted on the vehicle body frame side in the same way as on the rear side of the engine.

[0042]

[Effects of the Invention] Since the present invention has a configuration in which the rear side of the engine is attached to the vehicle body frame side by rubber mounting,
The left and right rocking of the engine relative to the vehicle body frame can be reduced, and the power transmission mechanism is less likely to be affected.

[Brief explanation of the drawing]

FIG. 1 is an overall side view of a folding motorcycle according to an embodiment of the present invention when assembled.

FIG. 2 is an overall side view of the same when folded.

FIG. 3 is a partially sectional side view of the engine in the same embodiment.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a plan view showing the arrangement of the engine with respect to the vehicle body.

FIG. 6 is a plan view of essential parts showing only the mount portion of the engine.

[Explanation of symbols] 1...Folding motorcycle, 2, 3...Front frame, 4...Head pipe, 5...Lower steering shaft,
6...Upper steering shaft, 7...Bottom bridge, 8...Front fork, 9...Upper arm, 10...
Handle holder, 11... Handlebar, 12... Headlight cover, 13... Headlight, 14, 15... Bracket, 16... Pin, 17... Lock pin, 18, 19...
Rear frame, 20...engine, 21...fuel tank, 2
2... Oil tank, 23... Exhaust muffler, 24... Guide rail groove, 25, 26... Roller, 27... Jont arm, 28, 29... Opening, 30, 31... Link, 32... Seat, 40... Left side case, 41 ...Right side case, 42...Cylinder, 43...Piston, 44...Connecting rod, 45...Crankshaft, 46...AC generator, 47...Drive pulley, 48...Driven pulley, 49...V belt, 50...
Clutch, 51... Driven shaft, 52, 53... Gear, 54
...Counter shaft, 55, 56...Gear, 57...Final drive shaft, 58...Drive pulley, 59...Engine cover, 60, 61...Front hanger bracket, 62...Rear hanger bracket, 63, 64...Bolt shaft, 65... Collar, 66, 67, 68, 69...Elastic member, 70, 71
...Collar, 72...Nut, 73...Washer, 80...Driven pulley, 81...Belt, 82...Rear axle.

Claims (1)

[Claims] Claim 1. An engine mounting structure for mounting an engine on a vehicle body frame, which includes two hanger brackets on the front side and one hanger bracket on the rear side, wherein the rear side of the engine is attached to the vehicle body frame side by rubber mounting. Motorcycle engine mount structure.