JPS5816967A - Car body frame for motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motorcycle body frame in which the body frame is divided into front and rear parts, and the frame is detachable.

The body frame of a motorcycle includes a main frame that extends from the head duve to the rear, a cradle-type body frame in addition to this, a down tube that extends diagonally downward and backward from the head tube, a back frame that is placed above the passenger seat, It is composed of frame members such as pack stays that extend diagonally to support this back frame.The main frame and down tube etc. form the front frame, and the back frame and pack stays form the rear frame. The front frame and the rear frame are inseparably connected by welding the front end of the back frame to the rear end of the main frame, and the body frame is constructed as one body.

As mentioned above, when manufacturing a conventional car body frame that is formed into a single piece by welding, the welding jig for welding work needs to be large enough to match the size of the car body frame, which makes handling difficult. A problem arises at this point. or,
The material for the body frame is limited to materials that can be welded, such as steel, which increases the weight of the vehicle, which is disadvantageous for motorcycles that require lightness.Furthermore, each type of motorcycle has its own body frame. This made it difficult to improve productivity.

Further, equipment such as a fuel tank and a passenger seat are assembled to the vehicle body frame, but there is a problem in that the assembly line for assembling these equipment is complicated.

In addition to the above, in an all-integrated body frame, a shock absorber that is installed between the body frame and a rear wheel support member such as a fork, and buffers and absorbs the upward movement of the rear wheel, is covered by the body frame constituent members. Because it is not exposed to the outside, when the shock absorber itself or its surroundings are assembled to the vehicle body frame or rear wheel support member, disassembled from these, or even adjusted, this work is troublesome, time-consuming, and time-consuming. As a result, there was a problem in terms of maintainability of the buffer.

The present inventors have developed the present invention in view of the above-mentioned conventional problems and to effectively solve the problems.

An object of the present invention is to make the rear frame, on which the seat is placed on the upper part, be detachably attached to the front frame, on which the head tube is fixedly fixed at the front end, by using coupling means such as bolts, and thereby the welding jig can be Since the front and rear frames need only be prepared separately, it is possible to achieve miniaturization and ease of handling, and it is also possible to use non-welded materials such as synthetic resin as the body frame material. This makes it possible to reduce the weight of the vehicle, and also to reduce the weight of either the front or rear frame.
For example, the front frame can be made common to different types of motorcycles, providing versatility and reusability.
In addition, we provide complete body frames for motorcycles that can simplify assembly lines in mass-production factories and improve mass productivity.

Particularly, in the present invention, the rear frame is integrally formed with parts constituting the air cleaner case, the seat bottom plate, the rear fender, etc., and each part constitutes each part of the rear frame, and each part constitutes the air cleaner case, the seat bottom plate, the rear fender, etc. An object of the present invention is to provide a body frame for a motorcycle that can reduce the number of parts, reduce installation man-hours, improve productivity, reduce costs, and reduce weight by being used as a rear fender, etc.

3- Next, a preferred embodiment of the present invention will be described in detail with reference to all the attached drawings. FIG. The front fork 4 supporting the front wheel 5 is supported in a freely steerable manner,
Top bridge 6 that supports the upper end of the front fork 4
A no-endoru 7 is attached on top. The front frame 2 has a cradle shape, and includes a main frame 2 that extends rearward from the head tube 6 with a slight downward inclination, a down tube 2b that extends rearward and downward from the head tube 3, and a down tube 2b that extends rearward from the lower end of the main frame 2a. Down tube lower 2cs released
The lower 2cs consists of a center tube 2d that extends upwardly from the rear end so as to be slightly inclined forward, and is joined to the rear end of the main frame 2a at its upper end, and the lower 2cs has two center tubes 2d symmetrically provided on the left and right. A fuel tank 8 is mounted on the main frame 2a of the front frame 2, and an engine 9 is mounted in a space quadrupled by the main frame 2a, the down tube 2b, the lower 2C and the center tube 2d. 10 extending forward and rearward is an exhaust pipe;
11 is a carburetor provided at the rear of the cylinder block of the engine 9. The rear lower part of the front frame 2, that is, the lower 2C
At the rear end, insert the bracket 1 between the lower part of the center tube 2d.
2 is provided, and the front end of the rear fork 13 is attached to the pivot point N1.
3 a L, rear wheel 14″ at the rear end of the rear fork 13
f: Support. A link mechanism 15 is attached to the front part of the rear fork 16 in order to obtain a progressive (gradual) shock absorbing characteristic. One end of the link mechanism 15 is connected to the frame side with a rod 15a, and the other end of the link mechanism 15 is connected to the frame side. Connected 16a to the lower end of the shock absorber 16 forming the unit,
The upper end of the buffer 16 is located at the rear end of the main frame 2a.
It is connected 16b to a bracket 17 provided at the upper end of the tube 2d and protruding rearward. On the other hand, a lower bracket 18 is provided at the lower part of the center tube 2d to protrude rearward.

Reference numeral 19 denotes a rear frame L, and the frame 19 is made of, for example, a sheet metal press molded product or a synthetic resin molded product, and is formed in a substantially triangular shape on the side, and is formed in a monocoque type. Rear frame 1
The details of 9 will be clearly shown in FIG. 2 and subsequent figures, and in the embodiment, it is formed of a monocoque made of synthetic resin.

The rear frame 19 also serves as an air cleaner case 20,
It consists of a hollow box-like body. The case 20 has a V-shaped side surface with the upper part completely closed, and upper protrusions 2 extending forward on both sides of the upper part of the case 20.
1.21 is formed, the protruding part 21.21 has the full thickness in the vertical direction and the thickness in the width direction, and the front end of the case between the protruding parts 21.21 is a recessed part 22 that curves backward, and as described above. The upper end of the buffer 16 is received. The upper wall of the case 20 is curved so that the middle part in the width direction bulges to one side, and serves as a support part 23 that supports the seat bottom plate part or the seat bottom part.
On both side walls 24, 24, a looper 25... for outside air intake that communicates the sealed chamber S in the case 20 with the outside air bulges outward, and is long in the front-rear direction below the looper 25... Openings 26... are formed. At the rear end of the case 20, at the rear of the support part 26, an extending part 27 is formed with an arcuate cross-section bulging in two directions, and an extending part 27 is formed at the rear of the supporting part 26. Lower protrusions 28, 28 are formed on the left and right sides of the lower portion to protrude forward. Then, an opening 30 is provided in the front wall 29 of the case 20 at a position offset to one side 5, for example, to the left from the vehicle body center line N-N,
This is because one shock absorber in the embodiment is disposed close to the center line of the vehicle body.

A cleaner element 61 is housed in the case 20 so as to be held by a metal fitting 62, and a sealing material 36 interposed between the element 31 and the back surface of the front wall 29 connects the clean side S2 with the opening 30 and the dirty side outside the element. Ride S1
and a thumbscrew 34 provided at the rear of the vehicle body center line.
It is attached and detached at , and the element is replaced. An opening 36 is provided in the rear wall 35 of the case 20, and the opening 36 is closed by a lid 37, which forms the lower part of the front half of the rear fender. vinegar.

The seat 38 is placed on the supporting part 26 forming the upper wall of the case of the second rear frame 19 so that the supporting part 26 forms the bottom plate, and the seat 68 is attached to the bottom plate 26, the cushioning material 38a on this 7-, and the outside. The mounting portion 27aTh is provided at the rear end of the extension portion 27, and the front end portion 39ak screw 4 of the rear half body 69 of the jaffender is attached to the mounting portion 27aTh with the same curvature.
The cover body 37, the extension part 27, and the rear half body 39 constitute a rear fender.

The upper left and right protrusions 21.2 of the rear frame 19
The upper bracket 1 of the front frame 2, which also serves as a bracket for the shock absorber 16, is attached through the mounting holes 21a, 21a provided in the front frame 2.
Attach the bolts and nuts 42 to the lower bracket 18 of the front frame 2 through the mounting holes 28a' provided in the left and right protrusions 28 and 28 of the lower part.
It is concluded by In this way, the rear frame 19 is detachably connected to the front frame 2. The lower protrusion 28° 28 is equipped with a plurality of mounting holes 28a, and by selecting the hole, it can be moved up and down using the connection part of the upper protrusion 21 of the rear frame 19 as a fulcrum, to create the optimal lighting that suits your taste. All positions can be selected.

In the drawing, 46 is a cylindrical member on the clean side supply port side of the case, 44 is a contube connecting this to the upstream side of the vaporizer 11, and both ends of the contube are connected with bands 45.4.
5 and is detachable, and is arranged so as to curve around to the left in a plan view to avoid interference with the shock absorber 16. Also, 46 in the figure is a muffler.

As is clear from the above description, according to the present invention, the vehicle body frame is constructed by making the rear frame detachable from the front frame. Since each frame can be separated, it can be made smaller; there is no need to consider weldability as a material for the body frame; synthetic resin can also be used; therefore, the weight of the vehicle can be reduced; , one of the rear frames can be made common to different models of fully automatic motorcycles, allowing for versatility and reusability of the body, and furthermore, productivity and mass production are improved, and factory This will take advantage of the advantages of simplifying the internal assembly line.

In particular, according to the present invention, the air cleaner case, seat bottom plate, and rear fender are formed integrally with the rear frame as a monolithic structure, so each part can be shared, no individual parts are required, the number of parts can be reduced, and the number of parts can be reduced. Since no installation is required, the number of installation steps can be reduced, productivity can be improved, and costs can be reduced.Furthermore, it is easy to manufacture by molding it with synthetic resin, and as shown in the example, there is an opening for the air cleaner on the side of the rear frame. By providing this, it is no longer necessary to place the air cleaner outside air intake at a high position below the seat bottom plate as in the past, and the seat height is reduced accordingly.
It has many advantages such as not requiring any unnecessary space.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of the motorcycle, FIG. 2 is a perspective view of the rear frame, FIG. 3 is a cross-sectional plan view of the engine, carburetor, and rear frame, and FIG. 4
The figure is a vertical rear view of the rear frame, and FIG. 5 is a vertical side view of the rear frame. In addition, in the drawing, 2Fi front frame, 6 is the head tube, 1
9 is the rear frame, 20 is the air cleaner case, 23 is the bottom plate of the seat 38, and 27.39 is the kerosene. Patent Applicant Honda Motor Co., Ltd. Representative Patent Attorney Yoshi Shimoda Patent Attorney Kunihiko Ohashi Patent Attorney Yu Koyama

Claims (1)

[Claims] It consists of a front frame with a head tube fixed to the front end, and a rear frame with a seat on the top.The rear frame is detachable from the front frame, and the rear frame has an air cleaner case, a seat bottom plate and A motorcycle body frame characterized by being formed by integrally molding a rear fender, etc.