JP5075069B2 - Clutch housing structure of work equipment - Google Patents

Description

  The present invention relates to a clutch housing structure for a working machine in which a clutch housing is attached to an engine via a rear end plate in a state where a rear end plate is joined to the front surface of the outer periphery of the opening of the clutch housing.

As a conventional technique, in a clutch housing structure of a work machine, there is known a structure in which a rear end plate is joined to a front surface of an opening of a clutch housing and a clutch housing is attached to an engine via a rear end plate (for example, Patent Document 1). reference).
JP 2001-122165 A

  For example, as shown in FIG. 1, when a front loader is mounted on the front part of the traveling machine body, a load applied to the front loader may cause a moment in which the center part in the front-rear direction of the traveling machine body is lifted upward (hogging). This moment may be applied to the rear end plate. Thus, in order to increase the strength of the rear end plate, a technique has been developed in which the plate thickness is increased or two rear end end plates are stacked and fastened together with the clutch housing.

  However, to increase the strength of the rear end plate, increasing the thickness or stacking two plates increases the distance between the rear end of the engine and the front surface of the outer periphery of the opening of the clutch housing, and the wheel base has a predetermined size. There are inconveniences different from those.

  It is an object of the present invention to provide a clutch housing structure for a working machine that can increase the strength while preventing the length of the joint portion between the rear end plate and the clutch housing from extending in the longitudinal direction of the machine body.

[Configuration of the first invention]
In order to achieve the above object, according to the first aspect of the present invention, the clutch housing is attached to the engine via the rear end plate in a state where the rear end plate is joined to the front surface of the outer periphery of the opening of the clutch housing. A reinforcing plate formed in a flat plate shape that fits inside the outer periphery of the opening of the clutch housing while surrounding the outer periphery, is superimposed on the surface of the rear end plate on the clutch housing side with its upper end approaching the inner wall of the clutch housing , The clutch housing has a flywheel that fits inside the outer periphery of the opening, and a rear end plate and a reinforcing plate are connected to the engine by bolts. It arrange | positions in the position facing a part in the front-back direction.

[Operation of the first invention]
According to the first aspect of the present invention, the reinforcing plate that is enclosed inside the outer periphery of the opening of the clutch housing while enclosing the outer periphery of the output shaft of the engine is superposed on the side of the clutch housing of the rear end plate. The plate added for the purpose of fitting is accommodated in the clutch housing and is not exposed to the outside, so that the thickness of the rear end plate is not increased. Moreover, the portion where the added reinforcing plate and the rear end plate are overlapped has the same reinforcing effect as the state where the thickness of the rear end plate is increased.

[Effect of the first invention]
Therefore, according to the first aspect of the present invention, since the plate thickness of the rear end plate at the joint portion with the clutch housing is not increased, the dimensions of the engine and the clutch housing are not expanded, and a predetermined wheel base can be secured, There is an advantage that the entire length of the airframe can be maintained compact.

  Since the rear end plate can be prevented from being deformed by adding the reinforcement, it is possible to prevent problems such as water intrusion into the clutch housing due to deformation of the rear end plate and deterioration of the clutch.

[Configuration of the second invention]
According to a second aspect of the present invention, in the configuration of the first aspect, the reinforcing plate is overlapped with the side of the clutch housing of the rear end plate in a state where an opening that coincides with the opening for inserting the output shaft of the engine formed in the rear end plate is formed. is there.

[Operation and effect of the second invention]
According to the second aspect of the invention, the reinforcing plate is formed with an opening that matches the opening for inserting the output shaft of the engine. As a result, in the rear end plate having no reinforcing plate and the rear end plate having the reinforcing plate, the inner diameters of the openings for inserting the output shaft of the engine are not different from each other (because they are the same as each other). This production facility can be used without greatly changing the existing production facility corresponding to the rear end plate not provided, which is advantageous in terms of production efficiency.

[Configuration of the third invention]
According to a third aspect of the present invention, in the configuration of the second aspect of the invention, the reinforcing plate is formed such that the vertical length of the upper portion of the opening is longer than the vertical length of the lower portion of the opening for inserting the output shaft of the engine. is there.

[Operation and effect of the third invention]
For example, when a front loader is attached to a traveling machine body and work is performed on the work machine, a moment at which the center part of the traveling body lifts upward (hogging) is generated due to the load at the time of work, and the rear end that is the coupling part of the clutch housing A tensile force may act strongly on the upper side of the plate. According to the third aspect of the invention, the reinforcing plate is superposed on the rear end plate in a state in which the vertical length of the upper portion of the opening is longer than the vertical length of the lower portion of the opening for inserting the output shaft of the engine. When the front loader is mounted, the rear end plate can be effectively reinforced, and water intrusion into the clutch housing and deterioration of clutch disengagement can be effectively prevented.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows the entire side surface of a tractor with a mid mower (an example of a work machine). The tractor with a mid mower includes a front loader 2 connected to the front portion of the traveling machine body 1 and front and rear wheels of the traveling machine body 1. A midmore 6 is detachably connected between the third and fourth via a four-link mechanism 5.

  The diesel engine 8 is disposed in the engine bonnet 7 at the front of the traveling body 1, the driver seat 9 is disposed between the left and right fenders 32 of the driving rear wheel 4, and the left and right steering front wheels 3 are disposed behind the engine bonnet 7. A steering handle 10 to be operated is disposed, and a step 11 is provided at the front lower side of the driver seat 9.

  The front loader 2 includes a pair of left and right lifting arms 12 pivotally supported on the front portion of the traveling machine body 1, a middle portion of the lifting arms 12, and a bucket 13 pivotally supported on the free end of the lifting arms 12. A pair of left and right hydraulic pressures disposed across a hydraulic tilt cylinder 14 disposed in a crossing state, a bracket 15 attached to a front portion of the traveling machine body 1 and an intermediate portion of the left and right lifting arms 12. It is comprised by the type | formula lifting cylinder 16 grade | etc.,. The front loader 2 can perform the lifting / lowering operation of the bucket 13 by the expansion / contraction operation of the lifting / lowering cylinder 16 and the vertical swing operation of the bucket 13 around the connection fulcrum X with the lifting / lowering arm 12 by the expansion / contraction operation of the tilt cylinder 14. It is configured.

  The midmore 6 includes a front link 17 attached to the front portion of the traveling vehicle body 1 positioned in front of the front axle 3a of the front wheel 3 in a side view, and a lower portion of the rear end portion of the engine bonnet 7 behind the front axle 3a. It is configured to be movable up and down by a four-link mechanism 5 with a rear link 18 pivotally attached to the rear link 18. The four-link mechanism 5 is interlocked and connected via a lift link mechanism 20 connected to the lift arm 19 and a link mechanism 21 linked to the lift link mechanism 20. , 21 is configured to raise and lower the midmore 6.

The lift link mechanism 20 swings up and down around a left and right lift link 22 connected to a pair of left and right lift arms 19 and a pivot point P1 connected to the lift link 22 and connected to the rear portion of the traveling machine body 1. The work machine connecting link 23 is connected to the rear end portion so that the work machine (not shown) can be moved up and down.
The linkage link mechanism 21 swings around the pivot point P <b> 2 positioned above the first swing arm 24 and the midmore 6, and swings around the pivot point P <b> 1 integrally with the work machine connection link 23. The relay rod 26 connected to the second swing arm 25, the third swing arm 27 swinging around the pivot point P2 integrally with the second swing arm 25, and the play of the third swing arm 27. It is comprised from the accommodation link 28 etc. which were connected with the edge part. Four stations connected to the lower end of the interchangeable link 28 via the lifting link mechanism 20 and the linkage link mechanism 21 by the expansion and contraction operation of a lift cylinder (not shown) housed in a hydraulic case 29 disposed below the driver seat 9. The midmore 6 is moved up and down by swinging the rear link 18 of the link mechanism 5 up and down. A lops frame 30 is erected at the rear of the traveling machine body 1.

  A radiator 33 is disposed in front of the engine 8, and a cooling fan 35 is disposed in front of the engine 8 so as to be covered with a fan shroud 34 attached to the rear of the radiator 33. The radiator 33 is fixed to the left and right front axle frames 36.

  As shown in FIGS. 2 and 3, a bottom plate 37 is welded between the left and right front axle frames 36, 36 below the fan shroud 34 of the radiator 33, and a U-shape is applied to the top surface of the bottom plate 37. The heat insulating plates 38 are fastened and fixed by a set of bolts and nuts 39 near the bottom plates 37 of the left and right front axle frames 36. Thus, when an external force from the front is applied to the lower part of the heat insulating plate 38, a load is received by the shearing force of the bolt, and when an external force from the front is applied to the upper portion of the heat insulating plate 38, the force that becomes a moment around the bolt axis is applied. Since it is received when it hits the bottom plate 37 at the end, the end hit also serves as a detent at the time of assembly and has a structure that is strong against forces from both the upper part and the lower part.

  This tractor with a midmore has an automatic engine stop device. FIG. 4 is a transmission system diagram, and the power of the engine 8 mounted on the front of the fuselage is transmitted to a main transmission 42 including a hydraulic continuously variable transmission (HST) via a main clutch 41. The speed change power from 42 is further shifted by a gear type auxiliary transmission 44 in the transmission case 43 and then transmitted to the rear wheel 4 and the front wheel 3. Further, part of the engine power input to the main transmission 42 is shifted by the PTO transmission mechanism 45, and then transmitted to the rear PTO shaft 47 at the rear of the machine body via the rear PTO clutch 46, and at the same time the mid PTO clutch 48. Is also transmitted to the mid PTO shaft 49 in the intermediate part of the machine body. A parking brake 51 for braking the rear wheel 4 by operating the parking brake lever 50 is provided.

  The main transmission 42 performs a stepless shift in the forward, neutral and reverse ranges by operating the main shift lever 52. The sub-transmission device 44 performs a two-step change gear change by operating the sub-transmission lever 53. The PTO speed change mechanism 45 is shifted to high speed, neutral, and low speed by operating the PTO speed change lever 54. The rear PTO clutch 46 is turned on and off by operating the rear PTO clutch lever 55. The mid PTO clutch 48 is turned on and off by operating the mid PTO clutch lever 56.

FIG. 5 shows an electrical system diagram of an automatic engine stop device that automatically stops the engine 8 based on the starter circuit and the absence detection.
A seat switch SW <b> 1 that constitutes an absence detection device is provided below the driver's seat 9 provided in the traveling machine body 1. The seat switch SW1 electrically detects whether the driver is seated or unseated from the presence or absence of a seating load on the driver's seat 9, and the engine 8 is detected when a seated state (switch-off) is detected under a predetermined condition. Is configured to stop automatically.
The PTO speed change lever 54 for operating the PTO speed change mechanism 45 includes a first PTO neutral switch SW2 disposed at the base of the lever 54 and a second PTO neutral switch SW3 disposed on the back surface of the lever guide. The first and second PTO neutral switches SW2 and SW3 are configured to be switched on when the PTO speed change lever 54 is operated to the neutral position.

  When the main transmission lever 52 for operating the main transmission 42 is operated to the neutral position, the main transmission neutral switch SW4 is turned on, and when the PTO transmission lever 54 is operated to the neutral position, the first PTO neutral switch SW2 is turned on. When the key switch 57 is moved into the starter position and operated in this state, the main shift neutral switch SW4, the first PTO neutral switch SW2 and the starter 58 are connected in series so that the starter 58 is activated and the engine 8 is started.

  The parking brake lever 50 is provided with a parking brake switch SW5 that is switched on when operated to brake the parking brake 51. The parking brake switch SW5 and the second PTO neutral switch SW3 are connected in series, and the circuit of these switches SW3 and SW5 and the seat switch SW1 are connected in parallel. When the circuit of the seat switch SW1 or the circuit of the switches SW3 and SW5 is in the energized state, the timer relay 59 connected to the key switch 57 is turned on and the key stop solenoid 60 (fuel cut solenoid) is kept in the on state. Then, the engine 8 maintains the driving state.

  That is, when the driver is seated on the driver's seat 9 and the seat switch SW1 is in the ON state, or when the PTO speed change lever 54 is operated to the neutral position and the second PTO neutral switch SW3 is in the ON state and the parking brake lever 50 Is operated to the braking position and the parking brake switch SW5 is in the ON state, the engine 8 maintains the driving state, but it is accurate even if the PTO speed change lever 54 is operated neutrally and the parking brake lever 50 is operated for braking. The timer relay 59 is activated and the key stop solenoid 60 is demagnetized after a few seconds when the user leaves the seat without performing the braking operation or when the neutral operation of the PTO shift lever 54 or the braking operation of the parking brake lever 50 is not performed. The fuel cut valve is not closed and the engine 8 is stopped.

  6 is a side view showing the clutch housing 61 that houses the main clutch 41, and FIG. 7 is a rear perspective view showing the rear end plate 62 that partitions the front opening of the clutch housing 61 and the rear end of the engine 8. As shown in FIG. The clutch housing 61 is attached to the rear end plate 62 with the bolt 70 in a state where the rear end plate 62 is fixed to the rear surface of the engine 8 with the bolt 70. A reinforcing plate 64 that fits inside the outer periphery of the opening of the clutch housing 61 while surrounding the outer periphery of the output shaft 63 of the engine 8 is superimposed on the back surface of the rear end plate 62 and joined by welding. That is, the reinforcing plate 64 is overlapped on the rear surface of the rear end plate 62 in a state where an opening 65 coinciding with the opening 65 for inserting the output shaft of the engine 8 formed in the rear end plate 62 is formed. The vertical length of the upper portion 64a of the opening 65 is longer than the vertical length of the lower portion 64b of the opening 65.

  7 is a hole for allowing the motor of the starter 58 to pass through, and a ring gear 68 formed on a flywheel 67 provided in the clutch housing 61 with a pinion gear attached to a motor (not shown). The engine 8 is operated by rotating the flywheel 67 by driving the starter 58.

  As shown in FIGS. 6 and 7, the rear end plate 62 and the reinforcing plate 64 are connected to the engine 8 together by bolts 70, and the plate thickness of the reinforcing plate 64 is substantially the same as the plate thickness of the rear end plate 62. Alternatively, the rear end plate 62 is configured to be slightly smaller than the plate thickness. Thus, while the distance between the rear end plate 62 and the flywheel 67 is set to be the same as the distance between the tractor rear end plate 62 and the flywheel 67 of the type that does not include the reinforcing plate 64, the rear end plate 62 and the flywheel 67 The head of the reinforcing plate 64 and the bolt 70 can be disposed between the two.

6 and 7, the length in the left-right direction of the right portion 64c of the opening 65 in the reinforcing plate 64 and the length in the left-right direction of the left portion 64d of the opening 65 in the reinforcing plate 64 are configured to be substantially the same length. The length of the right and left portions 64c, 64d of the opening 65 in the reinforcing plate 64 in the left-right direction is longer than the length of the lower portion 64b of the opening 65 in the reinforcing plate 64 in the vertical direction. 64 is configured to be shorter than the length of the upper part 64a of the opening 65 in the vertical direction.

[Another embodiment]
In the above embodiment, the rear PTO shaft 47 is provided, but the rear PTO shaft 47 may be omitted together with the rear PTO clutch 46.

Overall side view of tractor with midmore Engine room side view An exploded perspective view showing a mounting structure of a heat insulating plate below the fan shroud Transmission system diagram showing engine power transmission system Electric system diagram of starter and automatic engine stop device Longitudinal side view of clutch housing Rear perspective view showing rear end plate of front opening of clutch housing

Explanation of symbols

8 Engine 61 Clutch housing 62 Rear end plate 63 Output shaft 64 Reinforcement plate 65 Opening

Claims (3)

With the rear end plate joined to the front surface of the outer periphery of the opening of the clutch housing, the clutch housing is attached to the engine via the rear end plate, and from the outer periphery of the opening of the clutch housing while surrounding the outer periphery of the output shaft of the engine also reinforcing plate formed in a flat plate shape that fits inside the upper end Ri Oh superimposed on the face of the clutch housing side of the rear end plate while approaching the clutch housing inner wall, inside the clutch housing, the opening The rear end plate and the reinforcing plate are connected to the engine by bolts, and the bolt is fastened to the upper end of the flywheel in the front-rear direction. clutch Howe working machine is arranged at a position opposed to Ring structure.   2. The clutch housing for a working machine according to claim 1, wherein the reinforcing plate is overlapped with a side surface of the clutch housing of the rear end plate in a state where an opening corresponding to an opening for inserting an output shaft of the engine formed in the rear end plate is formed. Construction.   The clutch housing structure for a working machine according to claim 2, wherein the reinforcing plate is formed such that a vertical length of an upper portion of the opening is longer than a vertical length of a lower portion of the opening for inserting an output shaft of an engine. .

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