JP2002068059A - Engine guard device for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively mount an engine guard even in a diamond frame form having no lower frame on the lower side of an engine. SOLUTION: A main frame 4 is disposed in the longitudinal direction on the upper side of an engine 20. By suspending ands supporting the engine 20 on the main frame 4, the diamond frame form is made. This device is provided with an engine guard 12 crossing the side of the engine 2 in the vertical direction. The engine guard 12 is a pipe member formed into a substantially U-shape from a front view, a pair of left and right engine guards 12 is provided, stays 32 provided at the upper ends are mounted on a side surface of the main frame 4 and a weld nut 45 and a mounting stay 48 are fastened on a crank case 26 via a cross pipe 35 for connecting the left and right sides at the lower ends. An intermediate part of the cross pipe 35 is made into a breaker structure by fitting a thin diameter part 42 of a first pipe 40 into the second pipe 41 side and fastening the part 42 with a bolt 43.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine guard device for a motorcycle, and more particularly to a device suitable for a diamond frame type.

[0002]

2. Description of the Related Art It is known to provide an engine guard made of a pipe having a substantially U-shape in a front view on the left and right sides of an engine.
In a motorcycle of the cradle frame type that supports the engine by surrounding it in a substantially loop shape in side view, the upper end of the engine guard is attached to the main frame located above the engine, and the lower end is attached to the lower frame located above the engine. (For example, Japanese Utility Model Application Laid-open 63-19
No. 9888).

[0003]

By the way, as a frame type for supporting the engine, for example, a down frame in front of the engine and a lower frame below the engine in a Credor type frame are omitted, and a main frame above the engine and a rear side of the engine are omitted. Some use the engine as part of the frame.

[0004] However, if a frame type in which such a down frame for supporting the engine is not provided in front of the engine (hereinafter, such a frame type is referred to as a diamond frame in the present application), a lower frame is used. If the engine guard is provided, it will be difficult to support the lower end of the engine guard.If the support stays are extended downward from the main frame, the number of parts will increase and the body weight will increase. And an increase in cost. Therefore, an advantageous support structure for the engine guard in the form of a diamond frame is desired, and the present invention aims to fulfill such a request.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, the invention relating to the motorcycle engine guard device of the present application is described below.
A frame-shaped motorcycle that has a main frame that extends rearward from the head pipe, suspends and supports the engine below it, and does not have a down frame for supporting the engine in front of the engine. The engine guards are formed on both the left and right sides of the engine, and the upper ends of the engine guards are mounted on the main frame, and the lower ends are directly mounted on the lower side of the engine. In addition, while providing a cross pipe that connects between the lower ends of the left and right engine guards left and right,
A breaker unit can be provided at substantially the center of the cross pie in the left-right direction.

[0006]

According to the present invention, the upper ends of the left and right engine guards are attached to the main frame, and the lower ends are directly attached to the side of the engine. The lower end of the engine guard can be easily and securely attached without extending the like. Therefore, an increase in the number of parts can be prevented, and an increase in vehicle body weight and an increase in cost can be prevented. In addition, if a breaker is provided on the cross pipe that connects the lower ends of the left and right engine guards to the left and right, when an excessive load is applied to this cross pipe, the load is dispersed at the breaker, so the engine guard on the engine side Does not apply excessive load to the fixed part. Therefore, even if the engine guard is directly attached to the engine, it is not necessary to add a special reinforcing structure to the engine.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to the drawings. 1 to 4 relate to the embodiment, FIG. 1 is a side view of a motorcycle to which the embodiment is applied, FIG. 2 is a front view of the motorcycle viewed from the front, and FIG. FIG. 4 is a front view of the engine guard.

The motorcycle is configured as an emergency vehicle, and reference numeral 1 denotes a front wheel, 2 denotes a pair of left and right front forks,
3 is a handle, 4 is a pair of left and right main frames, 5 is a center frame, 6 is a rear swing arm, 7 is a rear wheel,
8 is a fuel tank and 9 is a seat. The front portion of the vehicle body is covered with a front cowl 10, and the left and right front portions are covered with side cowls 11.

An engine guard 12 is provided in a pair on the left and right sides, extending from the side cowl 11 in the left-right direction. The engine guard 12 is made of a metal pipe, has a substantially U-shape when viewed from the front, is vertically long, and has a warning light 13 and a siren 14 mounted thereon.

[0010] A rear cowl 15 is provided below the seat 9 at the rear of the vehicle body, and a trunk 16 is disposed on the rear side. A document box 17 is provided behind the seat 9, and a tail light unit 18 is further provided behind the document box 17. Reference numeral 19 denotes a rear warning light supported at a position higher than the seat 9 at the rear of the vehicle body.

Next, the frame structure will be described. As shown in FIG. 3, the main frame 4 is a square cross-section pipe formed by appropriately forming a metal by a suitable manufacturing method, such as one formed by extrusion of an aluminum alloy, and is disposed obliquely downward above the engine 20 in the front-rear direction. Front end head pipe 2
It is provided in pairs separated from the right and left.

An engine hanger 22 protruding downward is integrally provided at an intermediate portion of the main frame 4, and an upper end of a crankcase 26 behind a cylinder 25 of the engine is supported by a bolt 23 at a tip end thereof. The crankcase 26 has a structure in which the crankcase 26 is divided into upper and lower portions by a center joining line 27.

Although not shown in FIG. 3, the rear portion of the engine 20 is supported by the center plate 5. The center plates 5 are welded to the rear ends of the left and right main frames 4, respectively, and support the rear upper side of the crankcase, respectively. A front end of a rear swing arm 6 is swingably supported at a rear end of the crankcase.

Therefore, this frame type is a diamond frame type in which the engine is used as a part of the frame, and as in the Credor type, a down frame located in front of the engine, a lower frame located below the engine, and furthermore, A structure in which a pivot plate provided in the rearward direction of the engine and supporting the rear swing arm is omitted is provided, and the engine 20 of the present embodiment is suspended and supported by the main frame 4.

The engine guard 12 is disposed so as to obliquely cross the sides of the cylinder 25 and the cylinder head cover 29 at intervals. The engine guard 12 is a guard for the engine 20.

Next, the engine guard 12 will be described. As shown in FIG. 4, the engine guard 12 includes a main body 3 that extends in a vertical direction so that an upper side protrudes more outward.
0 and upper and lower ends 31 and 33 which are bent substantially horizontally from the upper and lower ends and extend toward the center of the vehicle body, and have a substantially U-shape as a whole. A stay 32 is attached to each of the left and right upper end portions 31. A collar 34 is welded to each of the left and right lower ends 33, and a cross pipe 35 is connected between the left and right collars 34.

The stay 32 has a rod 36 whose tip is fitted to the upper end 31 of the main body 30 and a plate 37 attached to the side surface of the main frame 4. The axial direction of the rod 36 is substantially perpendicular to the center of the vehicle body, and the plate 37 is obliquely connected to the inner end of the rod 36 on the inward side of the vehicle body, and extends forward from the head pipe 21 to the main frame 4. It overlaps the side surface and is bolted to a mounting boss 24 formed at an intermediate portion between the head pipe 21 and the engine hanger 22 (FIG. 3).

The upper portion of the main body 30 is bent substantially horizontally and extends toward the inside of the vehicle body, and is disposed so as to be substantially perpendicular to the center of the vehicle body in the mounted state. Similarly, the lower part of the main body 30 bends substantially horizontally, but its length is shorter than that of the upper part, and the lower end 33 of the tip is crushed, where it is welded to the outer periphery of the collar 34.

The cross pipe 35 is composed of a first pipe 40 and a second pipe 41 divided at a substantially central portion, and both ends of the first pipe 40 have a small diameter portion.
And the other end of the collar 34 is connected with a bolt.

The small-diameter portion 42 formed at the other end of the first pipe 40 is fitted to one end of the second pipe 41, and a bolt 43 is formed through a through-hole formed in the side surface of the second pipe 41 in advance.
By screwing the first pipe 40 and the second pipe 41
Are linked. The other end of the second pipe 41 is connected to the collar 34 in the same manner as the first pipe 40.

A base of a mounting stay 44 is welded to an intermediate portion of the first pipe 40. The mounting stay 44 is provided with a weld nut 45 and a collar 46.
The collar 46 and the weld nut 45 are bolted (not shown) to a boss 28 provided near the alignment line 27 at the front end of the crankcase 26.

A detent plate 47 is welded to the first pipe 40 in the vicinity of the collar 46, and its protruding end abuts against the outer surface of the crankcase 26 near the boss 28, and a large load is applied to the engine guard 12. It has become a detent when it is. A similar mounting stay 48 is provided for the second pipe 41.
And the detent plate 49 are welded. A weld nut 50 is mounted on the mounting stay 48, and is similarly mounted on the opposite side of the crankcase 26.

The connecting portion between the first pipe 40 and the second pipe 41 is formed by fitting the small-diameter portion 42 and tightening it with a bolt 43 at a substantially middle portion in the left-right direction, and exceeds the fastening force of the bolt 43. When a large load is applied to the cross pipe 35, the connection between the small diameter portion 42 and the bolt 43 is released and the first pipe 40 and the second pipe 41 are separated from each other. It has a breaker structure to prevent transmission of a heavy load. The bolt 43 is inserted in the front-rear direction of the vehicle body, so that the first pipe 40 and the second pipe 41 are easily bent up and down when a load is applied to the main body 30 from below. I have.

Next, the operation of this embodiment will be described. As shown in FIG. 3, a stay 3 facing the upper end of the engine guard 12 is provided.
2 is mounted on a mounting boss 24 provided on a side surface of the main frame 4, and a lower end is mounted on a mounting stay 44 via a cross pipe 35.
According to (48), the engine guard 12 is attached to the boss 28 provided at the lower front part of the crankcase 26, so that the engine 20 can be effectively used to attach the engine guard 12.

Therefore, even if the frame is of a diamond frame type and does not have a lower frame below the engine 20, the engine guard 12 can be easily and reliably mounted, and a special stay or the like is extended from the main frame 4 side. Since it does not need to be provided, it is possible to prevent the structure from becoming complicated and to prevent an increase in the number of parts, an increase in cost and an increase in weight.

In addition, a breaker structure is provided by dividing the middle portion of the cross pipe 35, fitting the small diameter portion 42 to the second pipe 41, and tightening this with the bolt 43. Because the load is dispersed,
An excessive load is not applied to the engine-side fixing portion provided with the boss 28. For this reason, even if the engine guard 12 is directly attached to the diamond frame type engine 20, it is not necessary to add a special reinforcing structure to the engine 20 side. The specific reference value of the excessive load is arbitrarily set according to the structure of the engine 20.

The present invention is not limited to the above embodiment, and various modifications and applications are possible within the same principle. For example, the breaker structure is different from the embodiment in that the cross pipe 35 is not formed by connecting the divided first pipe 40 and the second pipe 41, and a weak part is formed in a part of the cross pipe 35 formed as a single member. A known structure such as providing

[Brief description of the drawings]

FIG. 1 is a side view of a motorcycle according to an embodiment.

FIG. 2 is a front view thereof.

FIG. 3 is a side view of an engine guard and a main part of a vehicle body to which the engine guard is attached;

FIG. 4 is a front view of an engine guard.

[Explanation of symbols]

4: Main frame, 12: Engine guard, 20: Engine, 26: Crank case, 28: Boss, 30: Main body, 32: Stay, 35: Cross pipe, 42: Small diameter, 43: Bolt, 45: Weld Nut, 48: mounting stay

Claims (2)

[Claims] 1. A frame type motorcycle in which a main frame extending rearward from a head pipe is provided, an engine is suspended and supported below the main frame, and a down frame for supporting the engine is not provided in front of the engine. A motorcycle characterized in that a substantially U-shaped pipe-shaped engine guard is provided on each of the left and right sides of the engine, and each upper end is attached to the main frame, and each lower end is directly attached to a lower side of the engine. Engine guard device. 2. The vehicle according to claim 1, further comprising a cross pipe connecting left and right lower ends of the left and right engine guards to each other, and a breaker portion provided substantially at the center of the cross pipe in the left-right direction. Engine guard device for motorcycles.