JP2007062612A - Car body frame of small vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a car body frame of a small vehicle capable of reinforcing rigidity while easily filling a filling material leaving no space regardless of a shape of a hollow part. <P>SOLUTION: A down frame 13 of a motorcycle 10 is furnished with a plurality of hollow chambers 51 to 53, the second hollow chamber 52 out of these hollow chambers 51 to 53 is made into a liquid filling chamber 64, a first bulkhead 54 to partition the liquid filling chamber 64 and the adjoining first hollow chamber 51 is furnished with a pressure release valve 61 and the third hollow chamber 53 is furnished with a high pressure tank 56, and liquid 62 is pressurized in the high pressure tank 56 and made into high pressure liquid 62A after it is filled in the liquid filling chamber 64, and flexural rigidity of the down frame 13 is improved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technique for improving the rigidity of a body frame in a small vehicle.

Conventionally, a structure in which a hollow portion of a body frame is filled with a material such as foam or rubber has been proposed as a technique for improving vibration isolation and rigidity of a body frame in a small vehicle (see, for example, Patent Document 1).
JP 2000-280963 A (FIG. 4)

FIG. 4 of Patent Document 1 is a perspective view of the frame members of the body frame and the rear frame. The frame members 18 and 23 (the reference numerals are those of the same publication) are composed of an inner tube 25 and an outer tube 26. It is composed of a double wall 28 and is divided into a plurality of filling chambers 29, 29 by a plurality of partition walls 27, 27, and the open ends of these filling chambers 29, 29 are closed, corresponding to the respective filling chambers 29, 29. An anti-vibration material 30 such as a synthetic resin or a foaming material is filled without a gap from an injection port 31 provided at an appropriate position of the outer pipe 26.
Anti-vibration materials 30 are filled in the filling chambers 29 and 29 to improve the anti-vibration properties and bending rigidity of the frame members 18 and 23.

In known examples, the vibration isolator 30 filled in the frame members 18 and 23 is an anti-vibration material made of an elastic material such as rubber or synthetic resin, or a foamed material such as urethane foam, but rubber or synthetic resin. In the case of fixed elastic materials such as, it is difficult to fill tightly without gaps, and gaps are likely to occur depending on the shape of the hollow part, and in the case of foamed materials such as urethane foam, there are bubbles, so compression Yes, it is difficult to produce a rigid effect.
For this reason, in patent document 1, the reinforcement | strengthening is aimed at in conjunction with making a frame member into a double bottom.

  An object of the present invention is to provide a body frame of a small vehicle that can reinforce rigidity while easily filling a filling material without any gap regardless of the shape of the hollow portion.

  The invention according to claim 1 is characterized in that, in the body frame of a small vehicle that adjusts rigidity by filling the hollow portion with the filler, the filler is a pressurized liquid.

  According to a second aspect of the present invention, there is provided a vehicle body frame for a small vehicle that adjusts rigidity by filling a hollow portion with a filler. The hollow portion has a plurality of hollow chambers, and at least one of the plurality of hollow chambers. When the other hollow chamber is filled with a liquid filling, and the partition wall between the hollow chamber filled with the filling and the hollow chamber without the filling is filled with liquid more than a specific pressure. A pressure relief valve is provided that opens the valve when the pressure increases.

In the invention according to claim 1, the filling material filled in the hollow portion of the body frame is a pressurized liquid.
If this filler is a solid elastic material, it may be difficult to fill without a gap depending on the shape of the hollow part. There are limits.

  In this respect, since the filling material is liquid, the filling material can be easily filled without any gaps regardless of the shape of the hollow portion, and the liquid is a material that cannot be compressed, so that the rigidity is surely enhanced. Can be planned.

  The vehicle body frame according to claim 2 is provided with a pressure relief valve that opens when the liquid pressure is higher than a specific pressure in the partition wall. The pressure of the high-pressure liquid can be released from the partition wall to the second hollow chamber according to the bending or deformation of the frame.

  As a result, when the vehicle body frame receives a strong impact, the high-pressure liquid is gently moved inside the vehicle body frame to exert a damper effect, thereby enhancing the shock absorption effect of the vehicle body frame and filling the vehicle body. It is possible to prevent the frame from flowing out.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. “Front”, “rear”, “left”, “right”, “upper”, and “lower” indicate directions viewed from the driver. The drawings are to be viewed in the direction of the reference numerals.
FIG. 1 is a side sectional view of a motorcycle using a body frame according to the present invention. The motorcycle 10 includes a head attached to a front end portion of an upper frame 12 and a front end portion of a down frame 13 constituting the body frame 11. A pipe 14, a front fork 15 attached to the head pipe 14 so as to be able to swing left and right, a front wheel 17 and a steering handle 18 attached to the front fork 15, and a seat rail 21 extending obliquely upward and rearward from the upper frame 12. A rear frame 22 that supports the seat rail 21 from below, and is arranged so as to cross the rear frame 22 and is provided at the rear ends 12b and 13b of the upper frame 12 and the down frame 13 through a pivot shaft 24. The engine 25 is mounted so as to be swingable, and the engine 25 The power transmission mechanism 26 extended to the rear of the vehicle, the rear wheel 27 attached to the rear portion 26c of the power transmission mechanism 26, and the rear end portion 26b of the power transmission mechanism 26 and the rear portion 21b of the seat rail 21 are connected. A rear cushion unit 29, a storage chamber 30 disposed from the front to the rear of the seat rail 21, and a tandem seat 31 that is provided above the storage chamber 30 and serves as a seat on which a passenger sits.
In the present embodiment, the details of the down frame 13 which is a part of the vehicle body frame 11 and increases the bending rigidity by filling and pressurizing the liquid will be described with reference to the next drawing.

The cooling, fuel supply, intake and exhaust systems of the engine 25 will be described.
The engine 25 is a water-cooled engine, and a radiator 32 for cooling the engine 25 is disposed on the down frame 13 and a fuel tank 33 is disposed between the down frame 13 and the upper frame 12. A throttle body 34 for supplying 33 fuel to the engine 25 and a fuel injection device 35 are disposed behind the fuel tank 33 and above the engine 25, and an air cleaner 37 for supplying air to the throttle body 34 is disposed below the seat rail 21. The exhaust pipe 38 is disposed behind the engine 25 and the silencer 39 is disposed behind the exhaust pipe 38.
In addition, the cooling water piping which connects between the radiator 32 and the engine 25, the fuel piping which connects between the fuel tank 33 and the engine 25, etc. were abbreviate | omitted.

  Reference numeral 41 denotes a battery, 42 denotes a front brake unit, 43 denotes a front fender, 44 denotes a rear fender, 45 denotes a cowl member, and 46 and 47 denote helmets.

FIG. 2 is a cross-sectional view of a main part of a motorcycle including a body frame according to the present invention. The down frame 13 is a hollow frame 49 that constitutes the vehicle body 48 and is a pipe-shaped member.
The down frame 13 includes a first hollow chamber 51, a second hollow chamber 52, and a third hollow chamber 53 that are divided into three parts, and a first frame provided between the first hollow chamber 51 and the second hollow chamber 52. It consists of a first partition wall 54 and a second partition wall 55 provided between the second hollow chamber 52 and the third hollow chamber 53.

  Then, a high pressure tank 56 is provided in the third hollow chamber 53, a connection tube 57 for connecting the high pressure tank 56 and the second hollow chamber 52 is provided, and the connection tube 57 is passed through the second partition wall 55 to form a second. While communicating with the hollow chamber 52, a variable throttle valve 58 that adjusts the flow rate of the high-pressure gas is interposed in the middle of the connecting tube 57.

  The first partition 54 includes a pressure relief valve 61 that opens when the high-pressure liquid injected into the second hollow chamber 52 becomes higher than the maximum usable pressure. The structure and operation of the pressure relief valve 61 will be described in detail later.

  With such a configuration, the second hollow chamber 52 of the down frame 13 is filled with the liquid 62, and the inside of the second hollow chamber 52 is passed through the variable throttle valve 58 from the high-pressure tank 56 having a high-pressure gas having a predetermined pressure inside. A predetermined pressure is applied to the liquid 62, and the liquid injected into the second hollow chamber 52 by the pressure of the high-pressure gas is used as the high-pressure liquid 62A to increase the bending rigidity of the second hollow chamber 52. The reason why the bending rigidity of the second hollow chamber 52 is increased will be described in the next figure.

That is, the down frame 13 of the motorcycle 10 includes a hollow portion 50, and the second hollow chamber 52 of the hollow portion 50 is a liquid filling chamber 64 and is a first chamber that is adjacent to the liquid filling chamber 64. The first partition wall 54 that defines the hollow chamber 51 is provided with a pressure relief valve 61, and the third hollow chamber 53 is provided with a high-pressure tank 56. After the liquid 62 is injected into the liquid filling chamber 64, the pressure is increased by the high-pressure tank 56. The high pressure liquid 62A is pressed to increase the bending rigidity of the down frame 13.
In addition, although the non-flammable hydraulic fluid etc. are used for the liquid 62 which pressurizes and makes the high pressure liquid 62A, for example, it is not limited to this.

In this embodiment, the number of the hollow chambers is three, and the liquid 62 is injected into the second hollow chamber 52 of these hollow chambers, and the liquid 62 is pressurized to form the high-pressure liquid 62A, so that the second hollow chamber 52 is filled. The chamber 52 is configured to increase the bending rigidity. However, the number of hollow chambers that increase the bending rigidity may be two, four, or five, and the number is arbitrary. That is, there is no restriction as to which of the hollow chambers provided in the hollow portion 50 is filled with the high-pressure liquid, and any hollow chamber can be selected as necessary.
Accordingly, a portion where the rigidity needs to be increased is defined, a hollow chamber is provided, a liquid is injected into the hollow chamber, and the liquid is pressurized to increase the rigidity of the vehicle body frame 11.

FIG. 3 is a cross-sectional view illustrating a comparative example and an embodiment of the vehicle body frame according to the present invention, and shows a cross section of the down frame 13 as a hollow frame.
(A) is a comparative example, and shows a state in which the liquid filling chamber 64 is not filled with the high-pressure liquid 62A. If the outer diameter of the liquid filling chamber 64 is D and the inner diameter is d, the section modulus Za is given by Za = (π / 32) · (D ⁴ −d ⁴ ) / D.

  (B) is an Example and shows a state in which the liquid filling chamber 64 is filled with the high-pressure liquid 62A. If the sectional modulus of the high-pressure liquid 62A having an outer diameter d is Zg, the sectional modulus Zb in the example is given by Zb = Za + Zg, and the sectional modulus is larger than that of the comparative example. That is, Za <Zb is satisfied because the liquid filling chamber 64 is filled with the high-pressure liquid 62A.

Since the bending stress of the body frame 11 is obtained by dividing the bending moment M applied to the body frame 11 by the section modulus Z, the bending rigidity of the down frame 13 can be increased as the section coefficient Z increases.
Therefore, the bending rigidity of the down frame 13 can be increased by filling the down frame 13 that is the hollow frame 49 constituting the vehicle body with the high-pressure liquid 62A.

  Further, the body frame filled with the liquid generates a force to return to the bending to reduce the volume due to the pressure of the liquid (the principle of the Bourdon tube), so the down frame 13 (see FIG. 2) It is possible to give a restoring force to the impact applied from the front.

FIG. 4 is a view for explaining the structure of the pressure relief valve according to the present invention and its operation.
(A) is side sectional drawing of the pressure relief valve vicinity which concerns on this invention, and the 1st hollow chamber 51 used as the liquid storage space at the time of pressure relief valve operation | movement with the 2nd hollow chamber 52 filled with the high pressure liquid 62A, and A first partition wall 54 is provided between them, and a pressure relief valve 61 is provided in the first partition wall 54.

(B) is an enlarged cross-sectional view of part b of (a), and a pressure relief valve 61 is provided in the first partition wall 54 provided in the second hollow chamber 52 constituting a part of the down frame 13.
The pressure relief valve 61 is a member composed of a peripheral wall 71 raised from the first partition wall 54 and a valve body 72 fitted to the peripheral wall 71.

  (C) is an operational view of the pressure relief valve, and an impact force P is applied to the second hollow chamber 52 constituting the down frame 13, and the second hollow chamber 52 is deformed and filled into the second hollow chamber 52. When the pressure of the high pressure liquid 62 </ b> A exceeds a predetermined value, the valve body 72 included in the pressure relief valve 61 is detached, and the high pressure liquid 62 </ b> A is released to the first hollow chamber 51.

  In other words, the first hollow chamber 51 and the second hollow chamber 52 are provided in the down frame 13 constituting the vehicle body via the first partition wall 54, and the high-pressure liquid 62 is injected into the second hollow chamber 52. A pressure relief valve 61 is provided that opens the valve at an excessive pressure set higher than the maximum use pressure of the high-pressure liquid 62A.

  Since the pressure relief valve 61 that opens the valve at an excessive pressure set higher than the maximum use pressure of the high-pressure liquid 62A is provided in the first partition wall 54, when the down frame 13 receives a strong impact, the down frame 13 is bent. The pressure of the high-pressure liquid 62 </ b> A can be released from the first partition wall 54 to the first hollow chamber 51 according to or deformation.

As a result, when the down frame 13 receives a strong impact, the shock absorbing effect of the down frame 13 can be improved by gently moving the high-pressure liquid inside the down frame 13 to exhibit the damper effect.
Further, the movement of the high-pressure liquid 62A is limited to the inside of the down frame 13, and the leakage of the high-pressure liquid 62A to the outside can be prevented.

In the present embodiment, the second hollow chamber 52 of the down frame 13 is filled with the high-pressure liquid 62A, but the filling position of the high-pressure liquid 62A can be changed.
Furthermore, not only the down frame 13 but also other frames such as the upper frame 12 (see FIG. 1) and the rear frame 22 may be filled with the high pressure liquid 62A.

FIG. 5 is a system diagram for explaining a vehicle body frame and its rigidity control means according to another embodiment of FIG.
A hollow chamber for filling liquid is provided in the down frame 13 of the motorcycle, and a hydraulic pump 76 that is a pressurizing means 75 for supplying the liquid to the hollow chamber is provided, and pressure for adjusting the pressure of the liquid pressurized by the hydraulic pump 76 A pressure control valve 78 as an adjustment mechanism 77 is provided.

The hydraulic pump 76 is driven using a part of the power of the engine 25. A control unit 79 is connected to the pressure control valve 78. And the optimal pressure control according to the driving | running | working condition is performed by inputting the speed of a vehicle, a brake signal, an acceleration signal, etc. to this control part 79. FIG.
81 is a check valve that lowers the pressure of the liquid when the pressure in the hollow portion 50 exceeds a predetermined value, and 82 is an oil tank.

Since the pressure of the liquid is controlled by the pressure adjusting mechanism 77, the pressure in the down frame 13 can be adjusted by the pressure adjusting mechanism 77 in accordance with the driving condition such as the road surface condition and the vehicle speed.
By adjusting the pressure in the down frame 13 to an optimum pressure according to the driving situation, the bending rigidity of the down frame 13 can be adjusted and the riding comfort can be improved.

FIG. 6 is a system diagram for explaining a vehicle body frame and its rigidity control means according to still another embodiment of FIG. 1, and the points different from FIG. 5 will be mainly described.
The down frame 13 of the motorcycle is provided with a hollow portion 50 that is filled with liquid, the hollow portion 50 is provided with a hydraulic pump 76, and a variable throttle valve 84 that adjusts the pressure of the liquid pressurized by the hydraulic pump 76 is provided.

  The variable throttle valve 84 is adjusted to an optimum value by manual operation. In the scooter type motorcycle 10 having the power transmission mechanism 26 (see FIG. 1) which is a continuously variable transmission, generally, the engine Since the vehicle speed increases as the rotational speed increases, by providing the variable throttle valve 84 instead of the pressure control valve, the hydraulic pressure can be adjusted according to the vehicle speed with a simple configuration.

Next, the operation of the vehicle body frame described above will be described.
Returning to FIG. 2, the filling material filled in the hollow portion 50 of the vehicle body frame 11 is a pressurized liquid 62A.
If this filling material is a solid elastic material, it is difficult to densely fill without gaps depending on the shape of the hollow portion, and if it is a foam material, rigidity cannot be enhanced.
In this respect, since the filling material is the liquid 62 in the present invention, the filling material can be easily filled without a gap regardless of the shape of the hollow portion 50, and the liquid is a material that cannot be compressed. Can be planned.

Further, since the high-pressure liquid 62A is filled in the hollow frame 49, filling is easy.
If it is a liquid, even the hollow frame 49 having a complicated shape can be easily filled.
There is no bias in filling.
Therefore, when the hollow frame 49 is filled with the high-pressure liquid, the filling can be performed easily and uniformly.

In addition, the liquid with which the hollow frame is filled may be filled without being pressurized.
In addition, the target to be filled with the high-pressure liquid is not limited to the down frame. In other words, the present invention can be applied to an upper frame, a rear frame, etc. of a motorcycle generally constituted by a hollow frame.
Furthermore, although the present invention is applied to a motorcycle in the embodiment, it can be applied to a four-wheeled vehicle as long as it is a small vehicle, and can be applied to a general vehicle.

  The present invention is suitable for motorcycles.

1 is a side sectional view of a motorcycle using a body frame according to the present invention. 1 is a cross-sectional view of a main part of a motorcycle including a body frame according to the present invention. It is sectional drawing explaining the comparative example and Example of a vehicle body frame which concern on this invention. It is a figure explaining the structure of the pressure relief valve which concerns on this invention, and its effect | action. It is a systematic diagram explaining the vehicle body frame which concerns on another Example of FIG. 1, and its rigidity control means. It is a systematic diagram explaining the vehicle body frame which concerns on the further another Example of FIG. 1, and its rigidity control means.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Body frame, 48 ... Vehicle body, 49 ... Hollow frame, 51 ... 1st hollow chamber, 52 ... 2nd hollow chamber, 54 ... 1st partition, 55 ... 2nd partition, 61 ... Pressure relief valve, 62A ... High pressure liquid 77 ... Pressure adjustment mechanism.

Claims (2)

In the body frame of a small vehicle that adjusts the rigidity by filling the hollow portion with a filler,
The vehicle body frame of a small vehicle, wherein the filling is a pressurized liquid. In the body frame of a small vehicle that adjusts the rigidity by filling the hollow portion with a filler,
The hollow portion has a plurality of hollow chambers,
When filling at least one of the plurality of hollow chambers with a liquid filling and making the other hollow chamber a chamber without a filling,
The partition between the hollow chamber filled with the filler and the hollow chamber without the filler is provided with a pressure relief valve that opens when the pressure of the liquid becomes higher than a specific pressure. Characteristic body frame of small vehicles.

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