JPH0543555B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a motorcycle equipped with a damper-equipped shock absorber that absorbs and buffers shocks applied to rear wheels during running.

[Prior art]

Examples of conventional motorcycles equipped with damper-equipped shock absorbers include the following (a) and (b).

(a) A main frame is constructed by connecting a top tube extending substantially horizontally, a down tube extending diagonally downward at the rear, and a seat tube extending diagonally upward from the rear in an inverted trapezoid or triangular shape;
The left rear arm member and the right rear arm member are integrally connected by a connecting member to form a rear arm body whose front part is narrower than the rear part, and left and right triangular auxiliary arms are provided above each rear arm member. the front end of each auxiliary arm member to the front part of the narrow rear arm body, the rear end of each auxiliary arm member to the rear part of the wide rear arm body, and the rear arm body to the bottom of the main frame. The seat tube is pivotably supported so that the left and right side auxiliary arm members are positioned on both sides of the seat tube, and the front part of the damper-equipped shock absorber is attached to the upper part of the down tube, and the rear part is attached to the upper part of the down tube through the support shaft. There is one that is attached to the top of the left and right auxiliary arm members (for example, see Japanese Patent Application Laid-Open No. 51-31437).

(b) The front and rear sides of a pair of downtubes bent into a roughly U-shape, with a tank rail made of a thick tube arranged at an angle so that the rear is lower, and a steering head connected to the front end of the tank rail. the upper ends of which are connected to the front and rear of the tank rail, respectively;
The front ends of a pair of seat rails extending rearward are joined to the rear part of the tank rail to form a main frame, and the right rear arm member and the left rear arm member are joined together with a connecting member to constitute a rear arm body. Triangular auxiliary arm members on the left and right sides are arranged parallel to each other on the upper side of the main body, and the triangular base parts of the auxiliary arm members on the left and right sides are connected to the rear arm members on the left and right sides. The tops of the auxiliary arm members are connected by a connecting shaft, and the front part of the rear arm body is disposed between a pair of down tubes and pivotably supported thereto,
A shock absorber with a damper is fitted into the tank rail, the front part of the shock absorber is attached to the front part of the tank rail, and the rear part is attached to the connecting shaft at the top of the left and right auxiliary arm members ( For example, see Japanese Patent Publication No. 51-40336).

[Problem to be solved by the invention]

In the motorcycle described in (a) above, the left and right side auxiliary arm members are located on both sides of the seat tube of the main frame, and when an impact is applied to the rear wheel while riding, the left and right side auxiliary arm members move together with the rear arm body. Since the auxiliary arm member swings, there is a drawback that devices such as an air purifier and battery cannot be attached to both sides of the main frame such as the seat tube.

In the motorcycle described in (b) above, the tank rail that forms the buffer loading space is composed of a thick tube, making it difficult to attach the front part of the buffer to the front part of the tank rail. become, again,
Since the triangular auxiliary arm members on the left and right sides are arranged parallel to each other and connected to the upper side of the rear arm body, the space required for the left and right auxiliary arm members to swing together with the rear arm body is large. Furthermore, because the front part of the rear arm body is arranged between a pair of down tubes and pivoted thereto, the width of the main frame increases, and air purifiers, batteries, etc. can be installed on the sides of the main frame. The disadvantage is that the vehicle width becomes too wide when functional parts are installed.

The purpose of this invention is to provide a motorcycle that does not have the above-mentioned drawbacks. In other words, it is possible to accommodate a shock absorber with an attenuator in the de-ed space within the main frame, and also to provide a motorcycle that does not have the above-mentioned drawbacks. An object of the present invention is to provide a motorcycle equipped with a shock absorber with an attenuator to which devices such as an air purifier can be attached on both sides.

[Means to solve the problem]

The present invention employs the following configuration as a means for solving the above problems.

The structure of the present invention is that the main frame part extending from the rear half of the tank rail to the lower part of the first half of the seat is bifurcated to the left and right, and has a part extending diagonally downward, and a bent part that bends the rear part of the part downward. A shock absorber loading space is formed between the diagonally downwardly extending part and the bifurcated part of the downwardly bent bent part, and the rear arm is composed of a rear arm main body and left and right auxiliary arm members,
The rear arm main body is formed by integrally joining the left rear arm member and the right rear arm member with a connecting member, and the left and right auxiliary arm members are triangular in side view. The left and right auxiliary arm members are attached to the rear arm body so that the width between the outer surfaces of the first half is narrower than the width of the rear arm body in plan view and less than the width of the bent portion of the main frame. The width of the shock absorber mounting body fixed to the top and supported by the tops of the left and right auxiliary arm members is narrower than the width of the rear arm body in plan view, and less than the width of the bent portion of the main frame, etc. a frame portion in which a rear arm is pivotally supported below the main frame, a main portion of a shock absorber with an attenuator is housed in the shock absorber loading space, and a front portion of the shock absorber faces a front portion of the space; The rear part is attached to the top of the left and right side auxiliary arm members with a shock absorber mounting body, and equipment such as an air purifier is attached to the outside of the bent part of the main frame. Features of motorcycles.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4.

In these figures, reference numeral 1 denotes a main frame formed into a substantially box-shaped cross section by joining a pair of left and right metal plate members 1a and 1b, and this main frame 1 includes a tank rail portion 2, and A bent portion 3 is provided at the rear thereof. A steering head pipe 4 is welded to the front end of the tank rail section 2. As shown in FIGS. 1 and 2, a portion of the main frame extending from the second half of the tank rail section 2 to the bottom of the first half of the seat 63 is bifurcated to the left and right, and has a portion 2a extending diagonally downward;
Bent portion 3 bent downward at the rear of this portion 2a
from the second half of the tank rail section 2 to the seat 63.
A shock absorber loading space 5 is formed inside a bent portion 3 and a diagonally downwardly extending portion 2a of the main frame extending below the first half of the main frame.

That is, the metal plate members 1a and 1b constituting the main frame 1 have their outer sides slightly bulged in the vehicle width direction from the rear half of the tank rail section 2 to the bending section 3, and their inner sides are separated from each other. The inner surface plate 6 is welded to close these inner openings. As a result, a shock absorber loading space 5 that is vertically open is formed inside this inner surface plate 6 (FIG. 2).

At the bottom of the bent portion 3, there are left and right metal plate members 1a, 1.
b is polymerized and bonded. A circular opening 7 is formed at a position corresponding to the bent portion 3 of the metal plate member 1a.

In FIG. 1, reference numeral 8 denotes an air purifier disposed on the side of the opening 7, and the inner surface of the rear part of the air purifier faces the front part of an auxiliary arm member to be described later. Outside air enters the main frame 1 from the opening 7 through the air cleaner 8. Further, in FIG. 1, reference numerals 9 and 10 are suction pipes formed in the tank rail portion 2, and the air that enters from the opening 7 passes through the main frame 1, and from these suction pipes 9 and 10, the engine 20, which will be described later, is fed. It is inhaled into each cylinder.

A pair of left and right brackets 11 are firmly fixed to the main frame 1 with two bolts 12 and nuts so as to hang down from the bent portion 3 of the main frame 1. Therefore, this bracket 11 is substantially integrated with the main frame 1, and the two form a vehicle body frame 1A. A cylindrical bearing pipe 13 is fixed to the pair of left and right brackets 11 so as to pass through them, and both ends of this bearing pipe are arranged so as to slightly protrude from both sides of the vehicle body frame (i.e., the brackets 11, 11). It is located in A support shaft of a rear arm main body 30, which will be described later, is inserted into and removed from the bearing pipe 13.

20 is a V-type engine, each cylinder 21,
22 are mounted so as to be lined up in front and behind each other. That is, a bracket 23 bent into a substantially U-shape is fixed to the cylinder head of the front cylinder 21 so as to sandwich the tank rail section 2 of the main frame 1. has been fixed through. A bracket 24 having downwardly inclined mounting surfaces on the left and right sides is fixed to the cylinder head of the rear cylinder 22. A pair of left and right brackets 25 corresponding to the mounting surfaces of this bracket 24 are welded to the main frame 1.
These brackets 24 and 25 are elastically connected via a rubber bush (not shown). In addition, the crank case 26 of the engine 20
is fixed at its rear to the bracket 11.

27 and 28 are a pair of left and right carburetors, the left side carburetor 27 being interposed between the intake pipe 9 and the rear cylinder 22, and the right side carburetor 28 being interposed between the intake pipe 10 and the front cylinder 21. It is interposed in between. 29 is a rear wheel, which is held by a rear arm 30.

The rear arm 30 is composed of a rear arm main body and a pair of auxiliary arm members. The rear arm main body is composed of a left rear arm member, a right rear arm member, a connecting member consisting of a bracket 40 and a bracket 42, and the like.

In this embodiment, the rear arm member on the left side of the vehicle body, which constitutes the rear arm body, is constructed by combining a propeller shaft case 31 that covers a propeller shaft and a gear case 34 that covers a rear wheel support section. As shown in FIGS. 3 and 4, a bracket 40 having a U-shaped cross section and forming a part of the connecting member is welded to the front end of the propeller shaft case 31 on the vehicle body side. A large reduction gear (not shown) is housed inside the gear case 34, and the large reduction gear is driven by a propeller shaft 35 passing through the propeller shaft case 31, as shown in FIGS. 3 and 4.

Additionally, a universal joint 3 is provided at the front end of the propeller shaft 35.
6, and the diameter of the propeller shaft case 31 is enlarged at a position corresponding to the universal joint 36.

The rear arm member on the right side of the vehicle body, which constitutes the rear arm main body, is composed of a pipe 37 and an extension plate 41. The extension plate 41 and the bracket 42 welded to the front part of the pipe 37 are arranged so that a length that can accommodate the bearing pipe 13 is left between the front end of the bracket 40 welded to the propeller shaft case 31 and the front end of the extension part 41. The end portion is welded to a bracket 40 welded to the propeller shaft case 31, and the left rear arm member and the right rear arm member are firmly connected by a connecting member consisting of the bracket 40 and the bracket 42 at a portion near the shaft support. .

Furthermore, auxiliary arm members each having a triangular shape in side view on the left and right sides are disposed above the rear arm main body.
The left and right auxiliary arm members are pipes 32,
33, 38, 39, etc.

That is, as shown in Figures 1 to 3,
The pipe 32, which is the first half of the left auxiliary arm member, is inclined inward and backward, and its lower end is connected to the bracket 4, which is the connecting member on the propeller shaft case 31 side.
A pipe 33, which is welded to the left auxiliary arm member and forms the second half of the left auxiliary arm member, has its upper end bent inward and tilted forward, and its lower end is fixed to a gear case 34 that covers the rear wheel support part. The upper portions of the respective pipes 32 and 33 are connected to each other to form a left triangular auxiliary frame member with the left rear arm member as the base and the other two sides of the triangle as the pipes 32 and 33 when viewed from the side. There is.

Similarly, the pipe 38, which is the first half of the right auxiliary arm member, is inclined inward and backward, and its lower end is welded to the bracket 41, which is a connecting member, which is welded to the extension plate 41 and the front part of the pipe 37. The pipe 39, which is the latter half of the right auxiliary frame member, has its upper end bent inward and tilted forward, and its lower end is welded to the rear end of the pipe 37, so that the upper parts of the pipes 38 and 39 are connected to each other. They are combined to form a triangular right auxiliary arm member, with the right rear arm member as the base and the other two sides of the triangle as the pipes 38 and 39 when viewed from the side.

Triangular auxiliary arm members 3 on the right and left sides
1, 32 and 38, 39 have holes formed at their tops to support the shock absorber mounting body 30a, and the tops of the right and left auxiliary arm members are connected to each other via the shock absorber mounting body 30a supported thereon. be done.

As a result, the width between the outer surfaces of at least the front halves 32 and 38 of the left and right triangular auxiliary arm members and the width of the shock absorber mounting body 30a supported at their tops are as shown in FIG. , the width between the outer surfaces of the left and right rear arm members of the rear arm main body in plan view, that is, the outer surface of the portion such as the bent part 3 which is narrower than the width of the rear arm main body and which is divided into two parts of the main frame. The width between them is less than W.

In this embodiment, the left rear arm member includes a propeller shaft case 31 and a gear case 34;
The right rear arm member consisting of the pipe 37 and the extension plate 41 is connected by a connecting member such as the bracket 42 to form a rear arm body, and the left and right side auxiliary arm members are connected to the upper side of the rear arm body to form the rear arm. 30, but the present invention is not limited thereto.

As shown in FIG. 3, a nut 43 with a flange is fixed to the bracket 40, and the center line of the nut 43 intersects with the universal joint 36. In the bearing pipe 13, needle bearings 44, which constitute a bearing member, are located near both ends of the bearing pipe 13.
44 is interposed, the collar 45 is inserted, the support shaft 46 is inserted from the support shaft insertion hole of the extension plate 41, and the support shaft 46 passes through the collar 45. This support shaft 46 is made of a bolt, and its tip is attached to the bracket 40.
It is screwed into a nut 43 fixed to the holder.

A seal cover 47 is interposed between the support shaft receiving part of the extension plate 41 having the support shaft insertion hole and the end of the bearing pipe 13, and the bracket 4 which is a part of the case member
A seat cover 47 is interposed between the support bearing part where the flanged nut 43 of 0 is located and the end of the bearing pipe 13, and the seal covers 47, 47 are attached to the bearing pipe 13.
covers a seal that fits over the end of the

An output shaft (not shown) of the engine 20 faces the front end of the propeller shaft case 31, and this output shaft is connected to a universal joint of the propeller shaft 35. A bellows-shaped dust cover 49 is installed between the front end of the propeller shaft case 31 and the crankcase 26.

In FIG. 4, 50 indicates a pair of brackets 11.
This is a fixed pipe that passes through the This pipe 5
A main stand 51 (partially not shown) is rotatably supported at both ends of the pipe 50 by a bolt 52 and a nut 53 passing through the pipe 50.

In FIGS. 1 and 2, a shock absorber 6 with an attenuator is shown.
0 is shown, and the main part of this shock absorber 60 is loaded into the shock absorber loading space 5 which is open in the vertical direction of the seat 63, and its front end is an inner portion facing the front end of the shock absorber loading space 5. It is attached to a bracket 61 fixed to the face plate 6, and its rear end is attached to a shock absorber attachment body 30a supported by the tops of the left and right auxiliary arm members. Note that the reference numeral 62 in FIG. 1 indicates a fuel tank mounted on the tank rail 2.

According to this embodiment, when the rear wheel moves up and down, the rear arm 30 also swings about the support shaft 46, and accordingly, the shock absorber mounting body 3 at the top of the chevron-shaped auxiliary frame body
The attenuator-equipped shock absorber 60 attached to 0a expands and contracts. The shock caused by the vertical movement of the rear wheel 29 is absorbed by the expansion and contraction of the shock absorber 60. Then, the width between the outer surface of the first half of the left auxiliary arm member and the outer surface of the first half of the right auxiliary arm member in plan view is determined by the outer surface of the bent portion 3 etc. that is divided into two parts of the main frame. Since the width W between the main frames is smaller than the width W between the main frames, devices such as air cleaners can be attached to the outside of the bent portions of the main frame. Equipment such as an air cleaner does not obstruct the swinging of the left side and the front half of the left side auxiliary arm member.

In this embodiment, the propeller shaft case 31 is used as the left rear arm member of the rear arm 30, so that the rear arm can be made lighter and have a simpler structure. Further, since the bracket 40 and the extension plate 41 are connected by the bracket 42 constituting a connecting member, leaving a length that can accommodate the bearing pipe 13 at the front ends of the bracket 40 and the extension plate 41, the rear When assembling the frame 30 to the bearing pipe 13, the front end of the bracket 42 comes into contact with the front surface of the bearing pipe 13 and stops, making assembly work such as fitting the support shaft easier. Furthermore, since both ends of the bearing pipe 13 are disposed so as to protrude slightly from both sides of the vehicle body frame, when the bearing pipe 13 is welded to the vehicle body frame, the ends are not altered or deformed due to welding heat. This eliminates the need for processing after welding the end portion of the bearing pipe into which the sheet member or the like is fitted.

[Function and effect of the invention]

In this invention, the part of the main frame extending from the rear half of the tank rail to the lower part of the first half of the seat is divided into two parts on the left and right, with a part extending diagonally downward and a bent part bending the rear part of the part downward. a shock absorber loading space is formed between the diagonally downwardly extending portion and the bifurcated portion of the downwardly bent bent portion, and the rear arm is constituted by a rear arm main body and left and right auxiliary arm members, The left rear arm member and the right rear arm member are integrally connected by a connecting member to form a rear arm body, and the left and right auxiliary arm members are triangular in side view. The left and right side auxiliary arm members are attached to the rear arm body so that the width between the outer surfaces of the first half is narrower than the width of the rear arm body in plan view and less than the width of the bent portion of the main frame. The width of the shock absorber mounting body, which is fixed to the top and supported by the tops of the left and right auxiliary arm members, is narrower than the width of the rear arm body in plan view and less than the width of the bent portion of the main frame. , a rear arm is pivotally supported below the main frame, a main part of a shock absorber with an attenuator is housed in the shock absorber loading space, and a front part of the shock absorber is attached to a frame part facing the front part of the space. Since the rear part was attached to the top of the left and right side auxiliary arm members using the shock absorber mounting body, even if equipment such as an air purifier is installed outside the bent part of the main frame, the air purifier etc. The device does not interfere with the swinging of the front half portions of the left and right auxiliary arm members, and the amount of protrusion of the device in the vehicle width direction can be reduced, allowing effective use of space within the vehicle body.

In addition, this invention provides a method for loading a shock absorber between the part of the main frame extending from the rear half of the tank rail to the lower part of the first half of the seat, which is divided into two parts on the left and right, extending diagonally downward, and the bent part bent downward. Since a space is formed and a shock absorber with an attenuator is accommodated in the space, the shock absorber loading space opens in the vertical direction, and the front part of the shock absorber with an attenuator is attached to the frame portion facing the front end of the space. becomes easier,
At the same time, the dead space under the seat can be effectively utilized.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted side view of an embodiment of the present invention, Fig. 2 is a plan view, Fig. 3 is a partially sectional plan view showing an enlarged main part, and Fig. 4 is a partially omitted plan view. It is a cross-sectional rear view. In the figure, 1A is the vehicle body frame, 1 is the main frame, 2 is the tank rail, 2a is the part extending diagonally downward, 3 is the bent part, 5 is the buffer loading space, 8 is the air cleaner, 11 is the bracket, 13 is a bearing pipe, 29 is a rear wheel, 30 is a rear arm, 30a is a shock absorber mounting body, 31 is a propeller shaft case, 32 and 33 are pipes forming the left side auxiliary arm member,
34 is a gear case, 35 is a propeller shaft, 37 is a pipe, 38 and 39 are pipes forming the right side auxiliary arm member, 40 is a bracket, 41 is an extension plate, 42 is a bracket, 44 is a needle bearing, 4
6 is a support shaft, 60 is a shock absorber with an attenuator, 61 is a bracket, and W is the width of the main frame.

Claims (1)

[Claims] 1 The part of the main frame extending from the rear half of the tank rail to the lower part of the first half of the seat is bifurcated to the left and right, and consists of a part extending diagonally downward and a bent part bending the rear part of the part downward, A shock absorber loading space is formed between the downwardly extending part and the bifurcated part of the downwardly bent part, and the rear arm is composed of the rear arm main body and left and right auxiliary arm members, and the rear arm main body is composed of the left side auxiliary arm members. It is formed by integrally joining the rear arm member and the right rear arm member with a connecting member, and the left and right auxiliary arm members are formed in a triangular shape when viewed from the side. The left and right side auxiliary arm members are fixed onto the rear arm body so that the width between the sides is narrower than the width of the rear arm body in plan view and less than the width of the bent part of the main frame. The width of the shock absorber mounting body supported at the top of the auxiliary arm member is narrower than the width of the rear arm body in plan view and less than the width of the bent part of the main frame, and the rear arm is pivoted below the main frame. The main part of the shock absorber with an attenuator is housed in the shock absorber loading space, the front part of the shock absorber is attached to a frame part facing the front part of the space, and the rear part is attached to a shock absorber mounting body. A motorcycle characterized in that a device such as an air purifier is attached to the top of the left and right auxiliary arm members at the top of the main frame, and is attached to the outside of the bent part of the main frame.