JP2014024520A - Fuel tank support structure of walking type work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the engine performance deterioration due to foaming of a fuel which results from engine vibrations.SOLUTION: In a fuel tank support structure of a walking type work machine, an engine 2 and a fuel tank 4 are disposed at the upper part side of a machine body. The fuel tank 4 is connected to the upper part side of a transmission case 8 included in the machine body through a support member 10. The structure allows the fuel tank 4 to be disposed above the transmission case 8 in a state where the fuel tank 4 is supported only by the transmission case 8.

Description

  The present invention relates to a fuel tank support structure for a walking work machine in which an engine and a fuel tank are provided on the upper side of the airframe.

As the fuel tank support structure for the walking work machine as described above, for example, the fuel tank is installed on the upper side of a heat insulating plate (a support member for the fuel tank) installed over the crankcase of the engine and the mounting portion of the steering handle. (For example, refer patent document 1).
In addition, the fuel tank is mounted and fixed on a tank bracket (a support member of the fuel tank) installed over the front bracket fixed to the crankcase of the engine and the transmission lever guide fixed to the upper end of the transmission case. There is a configuration (see, for example, Patent Document 2).

JP 2009-6811 A (paragraph number 0018, FIGS. 4 to 6) JP 2008-179239 A (paragraph numbers 0047 to 0048, FIGS. 6 to 7)

  In the above configuration, since the vibration of the engine is easily transmitted to the fuel tank, the engine performance may be deteriorated due to the bubbling of fuel caused by the vibration of the engine.

  An object of the present invention is to prevent deterioration of engine performance due to fuel foaming caused by engine vibration.

The invention according to claim 1 of the present invention is a fuel tank support structure for a walking work machine in which an engine and a fuel tank are arranged on the upper side of the aircraft.
By connecting the fuel tank to the upper side of the transmission case provided in the airframe via a support member, the fuel tank is arranged above the transmission case in a single support state by the transmission case.

  In the above invention, it is possible to make it difficult for the vibration of the engine to be transmitted to the fuel tank, thereby preventing the foaming of the fuel in the fuel tank caused by the vibration of the engine.

  By the way, for example, some walk-type work machines are configured to perform transmission from an output shaft of an engine to an input shaft provided in a transmission case via a belt-type transmission device. In such a walking type work machine, when the transmission belt of the belt type transmission device is slack, it is common to remove the transmission belt slack by moving the engine away from the transmission case. . However, in the case where such slack removal of the transmission belt is performed in the walking type work machine employing the fuel tank support structure described in Patent Document 1 or 2, not only the engine is released but also the engine and It is necessary to release the connection between the support member of the fuel tank or the connection portion of the steering handle or the shift lever guide and the support member of the fuel tank. Therefore, the slack removal of the transmission belt is troublesome.

  On the other hand, in the above invention, since the support of the fuel tank is a single support state by the transmission case, when the transmission belt of the belt type transmission device is slackened, it is only necessary to release the fixing of the engine, The engine can be moved away from the transmission case, and the transmission belt can be loosened.

  Therefore, it is possible to prevent a decrease in engine performance due to fuel bubbling caused by engine vibration. Moreover, in the walking type working machine provided with the belt type transmission device, the transmission belt can be easily loosened.

The invention according to claim 2 of the present invention is the invention according to claim 1,
An anti-vibration material is interposed between the support member and the fuel tank.

  In the above invention, not only the vibration of the engine but also the vibration of the airframe during work can be made difficult to be transmitted to the fuel tank, thereby preventing the foaming of the fuel due to the vibration of the airframe during the work, etc. can do.

  Accordingly, it is possible to prevent the engine performance from being deteriorated due to the bubbling of fuel caused by the vibration of the engine or the vibration of the airframe during work.

The invention according to claim 3 of the present invention is the invention according to claim 1 or 2,
The supporting member is integrally equipped with an auxiliary member for attaching a steering handle.

  In the above-described invention, the steering handle can be attached to the support member without providing a separate steering handle mounting member.

  Therefore, it is possible to facilitate parts management and reduce costs by reducing the number of parts related to the attachment of the steering handle.

The invention according to claim 4 of the present invention is the invention according to any one of claims 1 to 3,
The support member is integrally equipped with an auxiliary member for connecting work equipment.

  In the above invention, the work equipment can be connected to the support member without providing a separate work equipment connection member.

  Therefore, it is possible to facilitate parts management and reduce costs by reducing the number of parts related to the connection of work devices.

It is a left view of a walk type work machine. It is a top view of a walk type work machine. It is a vertical left view of the principal part which shows the support structure of a fuel tank. It is a disassembled perspective view of the principal part which shows the support structure of a fuel tank.

  Hereinafter, an embodiment of a fuel tank support structure for a walking work machine according to the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 to 3, the walking work machine exemplified in this embodiment employs a recoil starter type engine 2 and a belt tension type clutch that is an example of a belt type transmission device A in the body frame 1. A main clutch 3, a fuel tank 4 made of a resin blow molded product, a steering handle 5 extending toward the rear of the machine body, a pair of left and right tillage rotors 6, and a resistance rod 7 as an example of the work equipment B, etc. It is prepared and configured.

  The belt-type transmission device A may be one that only transmits power and does not have a function as a clutch, or may be configured to have a function as a continuously variable transmission. .

  The fuselage frame 1 has a first support member 9 bolted to the upper and lower intermediate portions of the transmission case 8 also serving as a frame member in a forwardly extending posture, and a second support member 10 is connected to the upper portion of the transmission case 8 of the transmission case 8. Bolts are connected to cover the top.

  As shown in FIGS. 1 and 3, the motive power from the engine 2 is supplied from the left-right output shaft 2 </ b> A provided in the engine 2 through the main clutch 3 to the left-right input shaft 11 provided in the upper part of the transmission case 8. To communicate. Then, this input shaft 11 is used to drive the tilling rotor 6 and the like through a transmission system such as a chain transmission mechanism (not shown) built in the transmission case 8 and left and right side clutches (not shown). The power is transmitted to a pair of left and right output shafts 12 provided at the bottom of the case 8 in the left-right direction.

  The transmission case 8 has a left and right divided structure that can be divided into a left case member 8A and a right case member 8B, and enables bolt connection of the case members 8A and 8B over the entire outer periphery of each case member 8A and 8B. The flange portions 8a and 8b are formed. The upper input shaft 11 is positioned behind the engine 2, and the lower output shaft 12 is mounted on the airframe in a rear inclined posture where the lower output shaft 12 is positioned below the engine 2.

  As shown in FIGS. 3 and 4, the first support member 9 is made of sheet metal, and includes a pair of left and right mounting surfaces 9 </ b> A that allow the engine 2 to be mounted and supported on the upper portion thereof, and a transmission case 8 at the rear thereof. Are bent so as to have a pair of left and right connecting portions 9B in a vertical direction that enables bolt connection. A pair of front and rear elongated holes 9a that enable bolt connection of the engine 2 are formed in the left and right mounting surfaces 9A. Thereby, it is possible to adjust the position of the engine 2 in the front-rear direction within a predetermined range with respect to the first support member 9 so that the engine 2 can be easily fixed and held at an appropriate position. The left and right connecting portions 9B are fastened together with the left and right flange portions 8a and 8b by bolts 13 that connect the left and right flange portions 8a and 8b with the left and right flange portions 8a and 8b of the transmission case 8 sandwiched from the left and right. It is configured to perform the connection.

  As shown in FIGS. 1 to 4, the second support member 10 includes a support base 15 for receiving and supporting the fuel tank 4 from below on a support base 14 made of sheet metal that enables bolt connection with the transmission case 8, and a steering handle. The first auxiliary member 16 for attachment and the second auxiliary member 17 for connecting the work equipment are integrally provided by welding.

  In the state where the left and right flange portions 8a and 8b of the transmission case 8 are sandwiched from the left and right, the support base 14 is coupled with the left and right flange portions 8a and 8b by bolts 13 that connect the left and right flange portions 8a and 8b. A pair of left and right connecting portions 14A is provided.

  The support base 15 is welded with a second member 19 made of a sheet metal material formed in a substantially H shape in a plan view on both front and rear ends of a first member 18 made of a strip steel material bent and formed in a substantially U shape in a side view. Is configured. The second member 19 includes a pair of left and right screwing portions 19a used for fixing the fuel tank 4 to the left and right first support portion 19A located at the front thereof, and the left and right orientation located at the rear thereof. A pair of left and right engaging recesses 19b used for positioning the fuel tank 4 is formed in the second support portion 19B. A rubber grommet 20 having a function as a vibration isolating material C is detachably fitted in each of the left and right engaging recesses 19b. The second member 19 includes a heat shield wall portion 19C that hangs down from the rear end of the first support portion 19A so as to partition the cylinder head 2B of the engine 2 and the fuel tank 4. At the right end portion of the first support portion 19A, a screwing portion 19c used for attaching the upper cover 21 that covers the engine 2 and the fuel tank 4 from above is provided. The left end portion of the second support portion 19B is provided with a screwing portion 19d used for attaching a clutch cover 22 that covers the main clutch 3 from the left outer side.

  The first auxiliary member 16 is connected to a steering handle connecting portion at the upper end of an extended arm portion 16A made of a round pipe steel material that extends from the rear portion of the support base 14 toward the rear upper side in a bent state in a dogleg shape. It is equipped with 16B. A base end portion 5A of the steering handle 5 is connected to the connecting portion 16B via the left and right support shaft 23 so that the posture of the control handle 5 supporting the left and right support shaft 23 can be switched. . As a result, the left and right support shafts 23 are used as fulcrums in the operating posture in which the steering handle 5 extends rearward and upward from the connecting portion 16B and in the storage posture that extends forward from the connecting portion 16B. It is configured to allow posture switching.

  The second auxiliary member 17 is made of a round pipe steel material welded vertically to the rear end portion of the support base 14 so that the connecting portion 7A and the like provided on the upper portion of the resistance rod 7 can be inserted and removed. It is comprised so that pin connection of this becomes possible.

  As shown in FIGS. 3 and 4, the fuel tank 4 is integrally formed with a pair of left and right flange portions 4 </ b> A that are placed on the first support portion 19 </ b> A of the second member 19 at the front end portion thereof. The flange portion 4A is formed with a through hole 4a that enables bolt connection with the left and right screw portions 19a of the first support portion 19A. In addition, a pair of left and right engaging projections 4b that engage with the left and right engaging recesses 19b of the second support portion 19B via the grommets 20 are integrally formed in the bottom portion 4B of the fuel tank 4 in a hanging posture.

  From the above configuration, the fuel tank 4 is supported in a vibration-proof state by the grommet 20 by engaging the left and right engagement protrusions 4b into the left and right engagement recesses 19b of the second support portion 19B via the grommet 20. Positioning with respect to the table 15 can be performed. Thereafter, the flange portion 4A and the bottom portion 4B are placed on the second member 19, and the flange portion 4A is bolted to the first support portion 19A of the second member 19 to transmit power via the second support member 10 or the like. It can be deployed above the upper part of the transmission case 8 located behind the engine 2 in a single support state with the transmission case 8 supported and connected only to the case 8.

  Thereby, it is possible to make it difficult for vibration of the engine 2 to be transmitted to the fuel tank 4, and as a result, it is possible to prevent foaming of fuel in the fuel tank due to vibration of the engine 2, and engine performance due to such foaming. Can be prevented.

  Further, when the transmission belt 24 is slack in the main clutch 3, the engine 2 is transmitted along the long holes 9a only by releasing the bolt connection with the first support member 9 of the engine 2. It can be moved toward the front of the machine body in a direction away from the case 8, and the transmission belt 24 can be loosened.

  Further, the transmission tank 8 is mounted on the airframe in a rear inclined posture in which the upper input shaft 11 is positioned behind the engine 2 and the lower output shaft 12 is positioned below the engine 2. 4 in a state where the height position of the upper end thereof is the same as the height position of the support shaft 23 of the steering handle 5 which is the substantially upper limit position in the stowed state of the airframe when the steering handle 5 is switched to the retracted position. 2 can be arranged at a higher position above the upper upper end of the transmission case 8.

  Accordingly, the second support member 10 and the fuel tank 4 provided in the upper part of the transmission case 8 as well as the transmission case 8 and the transmission system provided in the transmission case 8 are balanced with the engine 2 in the front-rear direction without impairing the storage capacity of the airframe. Can be effectively utilized as a member for adjusting the balance, and as a result, the balance of the machine body can be stabilized.

  Although not shown in the figure, a front portion of the clutch cover 22 is provided with a connecting portion used for bolt connection with a screwing portion provided in the first support member 9. A rear portion of the clutch cover 22 is provided with a connecting portion used for bolt connection with a screwing portion provided in the second support member 10. The front upper part of the clutch cover 22 is provided with a screwing part used for bolt connection with a connection part provided in the upper cover 21.

  As shown in FIGS. 1 and 3, the main clutch 3 has its tension arm 25 linked to a main clutch lever 27 provided on the steering handle 5 via a release wire 26 and the like.

    [Another embodiment]

[1] The walking work machine may include a first output shaft for driving a wheel and a second output shaft for driving a working device such as a tilling rotor 6.

[2] The support member 10 is formed by integrally bending and forming a support base 15 for receiving and supporting the fuel tank 4 from below on a support base 14 made of a sheet metal that enables bolt connection with the transmission case 8. It may be. Further, the support base 15 may be connected to the support base 14 using bolts or rivets.

[3] The support base 15 of the support member 10 may be formed by integrally bending the first member 18 and the second member 19. Moreover, what connected the 2nd member 19 to the 1st member 18 using the volt | bolt or the rivet may be used.

[4] In addition to the configuration in which the grommet 20 (vibration isolation material C) is interposed between the second support portion 19B of the support member 10 and the fuel tank 4, the first support portion 19A of the support member 10 and the fuel tank 4 A vibration-proof material C such as a rubber plate may be interposed between the two. Further, instead of a configuration in which the grommet 20 (vibration isolation material C) is interposed between the second support portion 19B of the support member 10 and the fuel tank 4, the second member 19 of the support member 10 and the fuel tank 4 are An anti-vibration material C such as a rubber plate may be interposed between the first support portion 19A and the second support portion 19B of the support member 10 and the fuel tank 4 or the like.

[5] The fuel tank 4 may be made of sheet metal. Further, the support member 10 may be configured to be fixed only by bolt connection.

[6] The auxiliary member 16 for attaching the steering handle may be configured such that the steering handle 5 is connected and fixed in a state where the steering handle 5 cannot be switched to the retracted posture. Alternatively, the steering handle 5 may be configured to switch the posture between the operating posture and the storage posture by a turning operation of the steering handle 5 with a vertical support shaft as a fulcrum.

[7] As the auxiliary member 17 for connecting the work equipment, for example, it is formed in a U shape in a plan view, and the connecting portion provided in the working equipment B can be inserted and removed. It may be configured such that bolt connection is possible.

[8] As the work equipment B to be connected to the auxiliary member 17 for connecting the work equipment, a plate-like resistor, a rotating disk, a cultivator, a hoe capable of adding resistance to the movement of the machine body by driving the tilling rotor 6 A standing mat or a work implement configured to be able to switch the resistance rod 7 and the auxiliary wheel for movement between the usage state of the resistance rod 7 and the usage state of the auxiliary wheel may be used.

  The fuel tank support structure for a walking work machine according to the present invention can be applied to a walking work machine in which an engine and a fuel tank are provided on the upper side of the machine body.

2 Engine 4 Fuel tank 8 Transmission case 10 Support member 16 Auxiliary member for attaching steering handle 17 Auxiliary member for connecting work equipment C Anti-vibration material

Claims (4)

In the fuel tank support structure of the walking work machine in which the engine and the fuel tank are arranged on the upper side of the aircraft,
A walking type configured such that the fuel tank is disposed above the transmission case in a single support state by the transmission case by connecting the fuel tank to the upper side of the transmission case provided in the airframe via a support member. Work machine fuel tank support structure.   The fuel tank support structure for a walk-type work machine according to claim 1, wherein a vibration isolating material is interposed between the support member and the fuel tank.   The fuel tank support structure for a walk-type work machine according to claim 1 or 2, wherein an auxiliary member for attaching a steering handle is integrally provided on the support member.   The fuel tank support structure for a walk-type work machine according to any one of claims 1 to 3, wherein an auxiliary member for connecting work equipment is integrally provided on the support member.

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