JP6773375B2 - Work machine - Google Patents

Description

The present invention relates to a working machine such as a backhoe.

Conventionally, a working machine (backhoe) disclosed in Patent Document 1 is known.
The working machine disclosed in Patent Document 1 includes a machine body (swivel table) and a bonnet (rear cover) provided to be opened and closed with respect to the machine body. A support frame is erected at the rear portion of the airframe, and a locking member is provided at the right rear portion of the support frame. On the right side of the bonnet, a locked tool that is locked to the locking member when the bonnet is closed is provided.

Japanese Unexamined Patent Publication No. 2009-243070

According to the working machine disclosed in Patent Document 1, the bonnet can be closed by locking the locked tool with respect to the locking member. However, Patent Document 1 does not disclose a structure for surely closing the bonnet even when the bonnet or the like has a dimensional error or an assembly error.
Therefore, an object of the present invention is to provide a working machine capable of reliably closing the bonnet even when the bonnet or the like has a dimensional error or an assembly error.

The working machine according to one aspect of the present invention includes a machine body, a bonnet provided to be openable and closable with respect to the machine body, a locking piece provided to the bonnet, and a bonnet provided to the machine body and closed. A receiving member having a locking portion to which the locking piece is sometimes locked is provided, and the receiving member has a first receiving member fixed to the machine body and the locking portion and said the first. 1 The second receiving member connected to the receiving member, and at least one of the first receiving member and the second receiving member can adjust the relative positions of the first receiving member and the second receiving member. The second receiving member has a slit cut from the bonnet side toward the airframe side, and the bonnet has one side facing upward and the other side facing downward. An insertion plate is provided which is arranged so as to face and is inserted into the slit when the bonnet is closed .

According to the above-mentioned working machine, the bonnet can be reliably closed even if the bonnet or the like has a dimensional error or an assembly error.

It is a perspective view of a working apparatus. It is a perspective view of a boom. It is a partial notch perspective view which shows the reinforcing structure inside a boom. It is a vertical cross-sectional view which shows the reinforcement structure inside a boom. It is an enlarged view near the front reinforcing plate of FIG. It is an enlarged view near the rear reinforcing plate of FIG. It is a vertical cross-sectional view which shows the modification example of a reinforcing plate. It is a vertical sectional view which shows another modification example of a reinforcing plate. It is an upper perspective view of the tip part of a boom. It is a lower perspective view of the tip part of a boom. It is a vertical sectional view at the center of the tip of the boom in the width direction of the machine body. It is a cross-sectional view at the AA position of FIG. It is a perspective view of the boom tip portion and the arm base end portion. It is a perspective view of the aircraft seen from the front right. It is a perspective view which shows the arrangement of a control valve, a switching valve, a support shaft and the like. It is a partially enlarged view of FIG. It is a perspective view of a support member. It is an exploded perspective view of a support member. It is a top view which shows the operation of the position adjustment part. It is a top view which shows the operation of the 2nd position adjustment part. It is a perspective view which looked at the state which closed the bonnet from the diagonally rear view. It is a perspective view which looked at the state which closed the bonnet diagonally from the front. FIG. 21 is a perspective view showing a bonnet and the like as virtual lines. It is a top view which shows the state which the bonnet is closed. It is a top view which shows the state which the bonnet is opened. It is a perspective view which shows the locking piece and a receiving member. It is a perspective view which shows the state which the locking piece was locked with respect to the locking shaft, and the state which was disengaged. It is a top view which shows the state which the locking piece was locked with respect to the locking shaft, and the state which was disengaged. It is an exploded perspective view which saw the receiving member from the left front. It is a perspective view which looked at the receiving member from the right rear. It is a top view which shows the locking member and the receiving member in a state where a bonnet is open. It is a figure explaining the method of the position adjustment by the adjustment part. It is a side view which looked at the prime mover from the output shaft (crankshaft) side. It is a top view of the prime mover. It is a perspective view of the belt tension adjusting device seen from the output shaft side of a prime mover. It is a perspective view of a bracket, a rotation operation mechanism and a rotation member. It is a perspective view which looked at the belt tension adjustment device from the side opposite to the output shaft of a prime mover. It is a figure which shows the operation of the belt tension adjusting device from the output shaft side of a prime mover. It is a figure which shows the operation of the belt tension adjusting device from the side opposite to the output shaft of a prime mover. It is a top view of a working machine. It is a side view of a working machine.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate.
<Overall configuration of work machine>
First, the overall configuration of the working machine 1 will be described.
40 and 41 are schematic views showing the working machine 1 according to the present invention, and exemplify a backhoe which is a turning working machine.

The working machine 1 includes a machine body (swivel table) 2, a cabin 3, a traveling device 4, and a working device 5. Hereinafter, in the embodiment of the present invention, the front side (left side of FIG. 41) of the driver seated in the driver's seat 6 of the work machine 1 is the front, the rear side of the driver (right side of FIG. (Front side of FIG. 41) will be described as the left side, and the driver's right side (back side of FIG. 41) will be described as the right side. Further, the horizontal direction K2 (see FIG. 40), which is a direction orthogonal to the front-rear direction K1 (see FIG. 41), will be described as the body width direction. Further, the direction from the central portion to the right portion or the left portion of the airframe 2 will be described as the outer side of the airframe. In other words, the outside of the machine body is the direction K2 in the width direction of the machine body and away from the center in the width direction of the body 2. In addition, the direction opposite to the outside of the aircraft will be described as the inside of the aircraft. In other words, the inside of the machine is a direction that is K2 in the width direction of the machine and approaches the center in the width direction of the body 2.

The body 2 is supported so as to be able to turn above the traveling device 4. The machine body 2 has a swivel board 11 and a weight 12. The swivel board 11 is supported on the frame of the traveling device 4 via a swivel bearing, and swivels around a vertical axis (vertical axis) by being driven by a swivel motor. The weight 12 is attached to the rear portion of the machine body 2.
The cabin 3 is mounted on the left side and the front side of the airframe 2. A driver's seat 6 is provided inside the cabin 3.

A prime mover 13, a hydraulic pump 14, a fan 23, an alternator 24, a compressor 25, a radiator 46, and the like are arranged at the rear of the machine body 2. In the case of the present embodiment, the prime mover 13 is an engine, and in the present embodiment, it is a diesel engine. The prime mover 13 may be an engine different from a diesel engine such as a gasoline engine, or may be an electric motor. The prime mover 13 is provided with an output shaft (crankshaft, power transmission shaft) facing the machine body width direction (left side). The hydraulic pump 14 is arranged on the left side of the prime mover 13. The fan 23 is arranged to the right of the prime mover 13. The alternator 24 is arranged above the right front portion of the prime mover 13 and outputs DC power for storing in the battery. The compressor 25 is arranged above the left front portion of the prime mover 13 and compresses the refrigerant of the air conditioner that cools the inside of the cabin 3. The radiator 46 is arranged on the right side of the fan 23 and is cooled by driving the fan 23. The hydraulic pump 14, the fan 23, the alternator 24, and the compressor 25 are driven by the power of the prime mover 13.

A hydraulic oil tank 15, a control valve 26, and a battery (not shown) are arranged on the right side of the machine body 2. The hydraulic oil tank 15 stores hydraulic oil for operating hydraulic equipment (hydraulic cylinders and the like described later) provided in the machine body 2. The hydraulic oil stored in the hydraulic oil tank 15 is supplied by driving the hydraulic pump 14. The control valve 26 controls the supply of hydraulic oil to the hydraulic equipment.

The traveling device 4 is a crawler type traveling device, and is provided below the right side and the left side of the machine body 2, respectively. A dozer device 16 is provided at the front portion of the traveling device 4. The dozer device 16 is driven by a dozer cylinder 37.
A support bracket 17 is provided on the front portion of the machine body 2. A swing bracket 18 is pivotally supported on the support bracket 17. The swing bracket 18 can swing around the vertical axis by driving the swing cylinder 19 mounted on the swivel board 11. A working device 5 is attached to the swing bracket 19.

As shown in FIG. 41, the working device 5 includes a boom 8, an arm 9, and a working tool 10. In the present embodiment, the bucket is mounted as the work tool 10, but it is possible to mount another work tool (hydraulic attachment) in place of or in addition to the bucket. Examples of other working tools include a hydraulic breaker, a hydraulic crusher, an angle bloom, an earth auger, a pallet fork, a sweeper, a mower, and a snow blower.

Further, the work device 5 has a boom cylinder 20, an arm cylinder 21, and a work tool cylinder 22 as drive mechanisms (hydraulic actuators) for the boom 8 and the like. The boom cylinder 20, arm cylinder 21, work tool cylinder 22, swing cylinder 19, and dozer cylinder 37 are composed of hydraulic cylinders.
The base end portion of the boom 8 is pivotally supported by the swing bracket 18 via the first horizontal axis 31. The boom 8 swings up and down around the first horizontal axis 31 due to the expansion and contraction of the boom cylinder 20. The base end portion of the arm 9 is pivotally supported by the tip end portion of the boom 8 via a second horizontal axis (axial support shaft) 32. The arm 9 swings up and down around the second horizontal axis 32 due to the expansion and contraction of the arm cylinder 21.

The work tool 10 is attached to the tip end portion of the arm 9 via a third horizontal shaft 33 and a bracket 50. One end of the first link 48 is pivotally supported on the bracket 50 via the fourth horizontal axis 34. At the other end of the first link 48, one end of the second link 49 is pivotally supported via a fifth horizontal axis 35. The other end of the second link 49 is pivotally supported near the tip of the arm 9 on the proximal end side of the third horizontal axis 33 via the sixth horizontal axis 36. The tip of the work tool cylinder 22 is pivotally supported on the fifth horizontal axis 35. The base end portion of the work tool cylinder 22 is pivotally supported by a third pivot support member 29, which will be described later, provided on the base end side of the arm 9. The work tool 10 operates as a squeeze dump by expanding and contracting the work tool cylinder 22.

<Overall composition of the boom>
Next, the overall configuration of the boom 8 will be described.
As shown in FIGS. 1 to 3, the boom 8 has a boom main body 81 and a shaft support portion 82.
The boom main body 81 is bent so as to be convex upward in the middle portion in the length direction (direction from the proximal end side to the distal end side). That is, the boom main body 81 has a bent portion 81a in the middle portion in the length direction. Further, the boom main body 81 is formed in a substantially square tubular shape, and has a first vertical plate 8a, a second vertical plate 8b, a first horizontal plate 8c, and a second horizontal plate 8d.

The first vertical plate 8a is located on one side in the width direction of the machine body. The second vertical plate 8b is located on the other side in the width direction of the machine body. The first horizontal plate 8c connects the first vertical plate 8a and the second vertical plate 8b on one end side in the vertical direction. The second horizontal plate 8d connects the first vertical plate 8a and the second vertical plate 8b on the other end side in the vertical direction. In the case of the present embodiment, the first vertical plate 8a is a right plate, the second vertical plate 8b is a left plate, the first horizontal plate 8c is a lower plate, and the second horizontal plate 8d is an upper plate. The direction of the boom 8 is based on a state in which the boom 8 shown in FIGS. 40 and 41 is not swinging (a state in which the boom 8 extends in the front-rear direction).

As shown in FIGS. 1 and 2, the shaft support 82 includes a front shaft support 83 and a rear shaft support 84. As shown in FIGS. 1 and 41, the base end portion of the arm 9 is pivotally supported on the front shaft support 83 via the second horizontal shaft (axial shaft) 32. The rear shaft support 84 is pivotally supported by the swing bracket 18 via the first horizontal shaft 31.
The front axle branch 83 and the rear axle branch 84 are formed of, for example, cast steel or the like. The front shaft branch 83 is located at the tip (front end) of the boom 8. Specifically, the front shaft support 83 is fitted into the tip of the boom body 81 and fixed by welding. The rear axle branch 84 is located at the base end (rear end) of the boom 8. Specifically, the rear shaft support portion 84 is fitted into the base end portion of the boom body 81 and fixed by welding.

As shown in FIGS. 1 to 3, the boom 8 is provided with a first pivot member 27 and a second pivot member 28.
The first pivot member 27 is fixed to the outer surface (lower surface) of the first horizontal plate 8c in the middle portion in the length direction of the boom main body 81. Specifically, the first pivot member 27 is fixed to the lower surface of the first horizontal plate 8c at the bent portion 81a of the boom body 81.

As shown in FIGS. 1 and 41, one end (tip) of the boom cylinder 20 is pivotally supported by the first pivot member 27 via a pivot (first pivot) 51. The other end (base end) of the boom cylinder 20 is pivotally supported by the swing bracket 18 via a pivot (second pivot) 52.
As shown in FIG. 2, the first pivot member 27 has a right plate 27R and a left plate 27L. The right plate 27R and the left plate 27L are arranged so as to face each other with a gap in the width direction of the machine body. A pivot branch (boss) 271 is provided on each of the right plate 27R and the left plate 27L. Axis 271 supports both ends of the first Axis 51. As a result, one end (tip) of the boom cylinder 20 is pivotally supported by the pivot 271 via the first pivot 51.

The second pivot member 28 is fixed to the outer surface (upper surface) of the second horizontal plate 8d in the middle portion in the length direction of the boom main body 81. Specifically, the second pivot member 28 is fixed to the upper surface of the second horizontal plate 8d in front of the bent portion 81a of the boom body 81. One end (base end) of the arm cylinder 21 is pivotally supported by the second pivot member 28 via a pivot (third pivot) 53.
The second pivot member 28 has a right plate 28R and a left plate 28L. The right plate 28R and the left plate 28L are arranged so as to face each other with a gap in the width direction of the machine body. A second pivotal branch (boss) 281 is provided on each of the right plate 28R and the left plate 28L. The second Axis 281 supports both ends of the Third Axis 53. As a result, one end (base end) of the arm cylinder 21 is pivotally supported by the second pivot 281 via the third pivot 53.

As shown in FIG. 1, a plurality of oil feeding pipes are fixed to the boom 8 along the length direction of the boom 8. In the present embodiment, the first oil feed pipe 56 and the second oil feed pipe 57 are provided as a plurality of oil feed pipes. The first oil feed pipe 56 is a feed pipe for passing the hydraulic oil to be sent to the work tool cylinder 22 and a return pipe for passing the hydraulic oil returning from the work tool cylinder 22. The first oil feed pipe 56 extends along the upper surface of the boom main body 81. The second oil feed pipe 57 is a feed pipe through which the hydraulic oil sent to the port 40 is passed, and a return pipe through which the hydraulic oil returning from the port 40 is passed. The port 40 is a so-called service port, and a hydraulic hose that supplies hydraulic oil to the hydraulic actuator that drives the other working tools described above can be connected to the port 40.

One end of a hydraulic hose (first hydraulic hose) 38 is connected to the tip of the first oil supply pipe 56. One end of another hydraulic hose (second hydraulic hose) 39 is connected to the tip of the second oil supply pipe 57. The first hydraulic hose 38 and the second hydraulic hose 39 extend from the base end side to the tip end side of the boom 8. The other end of the first hydraulic hose 38 is connected to the work tool cylinder 22. The other end of the second hydraulic hose 39 is connected to the service port 40.

A third pivot member 29 is provided on the base end side of the arm 9. A pivot (fourth pivot) 54 is supported at the rear of the third pivot member 29. The other end (tip) of the arm cylinder 21 is pivotally supported by the fourth pivot 54. A pivot (fifth pivot) 55 is supported on the front portion of the third pivot member 29. One end (base end) of the work tool cylinder 22 is pivotally supported by the fifth pivot 55.

The third pivot member 29 has a right plate 29R and a left plate 29L. The right plate 29R and the left plate 29L are arranged so as to face each other with a gap in the width direction of the machine body. The right plate 29R supports one side (right side) of the fourth pivot 54 and one side (right side) of the fifth pivot 55. The left plate 29L supports the other side (left side) of the fourth pivot 54 and the other side (left side) of the fifth pivot 55.

<Reinforcement structure inside the boom>
Next, the reinforcing structure inside the boom 8 will be described. In the following description of the reinforcing structure, the boom cylinder 20 will be referred to as a first hydraulic cylinder and the arm cylinder 21 will be referred to as a second hydraulic cylinder for convenience. However, as shown in the modified example described later, the arm cylinder 21 may be the first hydraulic cylinder and the boom cylinder 20 may be the second hydraulic cylinder.
As shown in FIGS. 3 to 6, the boom 8 is provided with a reinforcing plate 60. The reinforcing plate 60 includes a front reinforcing plate 60A and a rear reinforcing plate 60B.
First, the front reinforcing plate 60A will be described with reference to FIGS. 3 to 5.
The front reinforcing plate 60A is provided inside the boom main body 81 at a position closer to the front of the boom main body 81 (in front of the bent portion 81a). As shown in FIG. 4, the front reinforcing plate 60A is provided at a position in front of the first pivot 51 and the third pivot 53 (on the tip side of the boom 8).

The front reinforcing plate 60A has a first support portion 61A, a second support portion 62A, a first bending portion 63A, a second bending portion 64A, and a connecting portion 65A. The first support portion 61A, the second support portion 62A, the first bent portion 63A, the second bent portion 64A, and the connecting portion 65A are integrally formed by bending one metal plate.
The first support portion 61A has a plate shape, and one surface (lower surface) is in contact with the inner surface (upper surface) of the first horizontal plate 8c. The second support portion 62A has a plate shape, and one surface (upper surface) is in contact with the inner surface (lower surface) of the second horizontal plate 8d.

Both or one of the first support portion 61A and the second support portion 62A is fixed to the inner surface of the boom body 81 (upper surface of the first horizontal plate 8c and / or lower surface of the second horizontal plate 8d) by welding or the like. There is. For example, the first support portion 61A has a first vertical plate 8a, a second vertical plate 8b, and a first horizontal plate (lower plate) on substantially the entire circumference of the first support portion 61A (including the first bent portion 63A). It is welded to the inner surface of 8c. Further, the second support portion 62A is welded to the inner surfaces of the first vertical plate 8a and the second vertical plate 8b, but is not welded to the inner surface of the second horizontal plate (upper plate) 8d. However, the welded portion between the first support portion 61A and the second support portion 62A is not limited to this example.

The width of the first support portion 61A (length in the width direction of the machine body) is set to be equal to or greater than the distance between the outer surface (left surface) of the right plate 27R of the first pivot member 27 and the outer surface (right surface) of the left plate 27L. ing. The width of the second support portion 62A (length in the width direction of the machine body) is set to be equal to or greater than the distance between the outer surface (left surface) of the right plate 28R of the second pivot member 28 and the outer surface (right surface) of the left plate 28L. ing.
The first bent portion 63A is bent from the first support portion 61A toward the second horizontal plate 8d side. The first bent portion 63A is close to the inner surface of the first horizontal plate 8c at a position where the first horizontal plate 8c is sandwiched between the first bending portion 63A and the first pivot member 27. Specifically, as shown in FIG. 4, the first bent portion 63A is between the end (front end) 27a of the first pivot member 27 in the boom length direction and the pivot 271, and the first horizontal plate. It is close to the inner surface (upper surface) of the first horizontal plate 8c at a position where it overlaps the front portion of the first pivot member 27 with the 8c in between.

The first support portion 61A extends from the first bent portion 63A along the inner surface of the first horizontal plate 8c in a direction away from the pivot portion 271 (a direction away from the first pivot 51). Further, the first support portion 61A extends from the first bent portion 63A along the inner surface of the first horizontal plate 8c in a direction away from the second pivot portion 281 (a direction away from the third pivot 53). There is. Specifically, the first support portion 61A extends forward (on the tip end side of the boom 8) from the first bent portion 63A along the upper surface of the first horizontal plate 8c.

As shown in FIG. 5, the first support portion 61A has a different extension length from the first bent portion 63A in the body width direction. Specifically, a portion (maximum extension portion) 61a having a maximum extension length from the first bending portion 63A is provided on one side and the other side in the body width direction, respectively, and the first bending portion 63A A portion (minimum extension portion) 61b having the minimum extension length from the to is provided in the center in the body width direction. The extension end of the maximum extension portion 61a and the extension end of the minimum extension portion 61b are formed in an arc shape. The maximum extension portion 61a is in contact with the inner surface of the first horizontal plate 8c at a position overlapping the left plate 27L and the right plate 27R via the first horizontal plate 8a. The minimum extension portion 61b is in contact with the inner surface of the first horizontal plate 8c at a position between the left plate 27L and the right plate 27R.

The front end of the first support portion 61A (extended end of the maximum extension portion 61a) is located in front of the front end 27a of the first pivot member 27. The rear end of the first support portion 61A (the boundary portion with the first bent portion 63A) is located behind the front end 27a of the first pivot member 27. That is, the front end 27a of the first pivot member 27 is located between the front end and the rear end of the first support portion 61A in the front-rear direction.

The second bent portion 64A is bent from the second support portion 62A toward the first horizontal plate 8c side. The second bent portion 64A is close to the inner surface of the second horizontal plate 8d at a position overlapping the front portion of the second pivot member 28 via the second horizontal plate 8d.
As shown in FIG. 4, the second support portion 62A extends from the second bent portion 64A along the inner surface of the second horizontal plate 8d in a direction away from the pivot portion 271 (a direction away from the first pivot 51). It is set up. Further, the second support portion 62A extends from the second bent portion 64A along the inner surface of the second horizontal plate 8d in a direction away from the second pivot portion 281 (a direction away from the third pivot 53). There is. Specifically, the second support portion 62A extends forward (on the tip end side of the boom 8) from the second bent portion 64A along the lower surface of the second horizontal plate 8d.

As shown in FIG. 5, the second support portion 62A has a different extension length from the second bent portion 64A in the body width direction. Specifically, a portion (maximum extension portion) 62a having a maximum extension length from the second bending portion 64A is provided on one side and the other side in the body width direction, respectively, and the second bending portion 64A A portion (minimum extension portion) 62b having the minimum extension length from the to is provided at the center in the body width direction. An arc shape is formed between the extension end of the maximum extension portion 62a and the extension end of the minimum extension portion 62b. The maximum extension portion 62a supports the inner surface of the second horizontal plate 8d at a position overlapping the left plate 28L and the right plate 28R via the second horizontal plate 8d. The minimum extension portion 62b is in contact with the inner surface of the second horizontal plate 8d at a position between the left plate 28L and the right plate 28R.

The front end of the second support portion 62A (extended end of the maximum extension portion 62a) is located in front of the front end 28a of the second pivot member 28. The rear end of the second support portion 62A (the boundary portion with the second bent portion 64A) is located behind the front end 28a of the second pivot member 28. That is, the front end of the second pivot member 28 is located between the front end and the rear end of the second support portion 62A in the front-rear direction.
The connecting portion 65A connects the first bent portion 63A and the second bent portion 64A. The connecting portion 65A is inclined so as to move forward (toward the tip end side of the boom 8) from the first supporting portion 61A toward the second supporting portion 62A.

One of the first bent portion 63A and the second bent portion 64A is bent at an acute angle, and the other is bent at an obtuse angle. In the present embodiment, the first bent portion 63A is bent at an acute angle, and the second bent portion 64A is bent at an obtuse angle.
Next, the rear reinforcing plate 60B will be described with reference to FIGS. 3, 4, and 6.
The rear reinforcing plate 60B is provided inside the boom main body 81 at a position closer to the rear of the boom main body 81 (behind the bent portion 81a). As shown in FIG. 4, the rear reinforcing plate 60B is provided at a position rearward (on the base end side of the boom 8) of the first pivot 51 and the third pivot 53.

The rear reinforcing plate 60B has a first support portion 61B, a second support portion 62B, a first bent portion 63B, a second bent portion 64B, and a connecting portion 65B. The first support portion 61B, the second support portion 62B, the first bent portion 63B, the second bent portion 64B, and the connecting portion 65B are integrally formed by bending one metal plate.
The first support portion 61B has a plate shape, and one surface (lower surface) is in contact with the inner surface (upper surface) of the first horizontal plate 8c. The second support portion 62B has a plate shape, and one surface (upper surface) is in contact with the inner surface (lower surface) of the second horizontal plate 8d.

Both or one of the first support portion 61B and the second support portion 62B is fixed to the inner surface of the boom body 81 (upper surface of the first horizontal plate 8c and / or lower surface of the second horizontal plate 8d) by welding or the like. There is.
The first bent portion 63B is bent from the first support portion 61B toward the second horizontal plate 8d side. The first bent portion 63B is close to the inner surface of the first horizontal plate 8c at a position overlapping the rear portion of the first pivot member 27 via the first horizontal plate 8a.

As shown in FIG. 4, the first support portion 61B extends from the first bent portion 63B along the inner surface of the first horizontal plate 8c in a direction away from the pivot portion 271 (a direction away from the first pivot 51). It is set up. Specifically, the first support portion 61B extends rearward (on the base end side of the boom 8) from the first bent portion 63B along the upper surface of the first horizontal plate 8c.
As shown in FIG. 6, the first support portion 61B has a different extension length from the first bent portion 63B in the body width direction. Specifically, a portion (maximum extension portion) 61c having a maximum extension length from the first bending portion 63B is provided on one side and the other side in the width direction of the machine body, respectively, and the first bending portion 63B A portion (minimum extension portion) 61d having the minimum extension length from the to is provided at the center in the width direction of the machine body. An arc shape is formed between the extension end of the maximum extension portion 61c and the extension end of the minimum extension portion 61d. The maximum extension portion 61c is in contact with the inner surface of the first horizontal plate 8c at a position overlapping the left plate 27L and the right plate 27R via the first horizontal plate 8c. The minimum extension portion 61d is in contact with the inner surface of the first horizontal plate 8c at a position between the left plate 27L and the right plate 27R.

The rear end of the first support portion 61B (extended end of the maximum extension portion 61a) is located behind the rear end 27b of the first pivot member 27. The front end of the first support portion 61B (the boundary portion with the first bent portion 63B) is located in front of the rear end 27b of the first pivot member 27. That is, the rear end 27b of the first pivot member 27 is located between the front end and the rear end of the first support portion 61B in the front-rear direction.

The second bent portion 64B is bent from the second support portion 62B toward the first horizontal plate 8c side. The second bent portion 64A is close to the inner surface of the second horizontal plate 8d.
The second support portion 62B extends from the second bent portion 64B along the inner surface of the second horizontal plate 8d in a direction away from the pivot portion 271 (a direction away from the first pivot 51). Specifically, the second support portion 62B extends rearward (on the base end side of the boom 8) from the second bent portion 64B along the lower surface of the second horizontal plate 8d.

As shown in FIG. 6, the second support portion 62B has a different extension length from the second bent portion 64B in the body width direction. Specifically, a portion (maximum extension portion) 62c having the maximum extension length from the second bending portion 64B is provided on one side and the other side in the body width direction, respectively, and the second bending portion 64B A portion (minimum extension portion) 62d having the minimum extension length from the fuselage is provided in the center in the width direction of the machine body. An arc shape is formed between the extension end of the maximum extension portion 62c and the extension end of the minimum extension portion 62d.

The connecting portion 65B connects the first bent portion 63B and the second bent portion 64B. The connecting portion 65B is inclined so as to move rearward (toward the base end side of the boom 8) from the first support portion 61B toward the second support portion 62B. As a result, the connecting portion 65A is inclined so as to move forward from the first supporting portion 61A toward the second supporting portion 62A, and the connecting portion 65B is inclined toward the second supporting portion 62B from the first supporting portion 61B. It is configured to incline so as to move backward. Therefore, the front reinforcing plate 60A arranged in front of the bent portion 81a and the rear reinforcing plate 60B arranged behind the bent portion 81a can effectively prevent the entire boom 8 from bending and deforming.

One of the first bent portion 63B and the second bent portion 64B is bent at an acute angle, and the other is bent at an obtuse angle. In the present embodiment, the first bent portion 63B is bent at an acute angle, and the second bent portion 64B is bent at an obtuse angle. As a result, the strength of the reinforcing plate 60 at the first bent portion 63A is greatly improved, so that the reinforcing effect can be enhanced. Further, since one of the first bent portion 63A and the second bent portion 64A is bent at an acute angle and the other is bent at an obtuse angle, the first pivot member 27 and the second pivot member 28 are booming. The first horizontal plate 8c and the second horizontal plate 8d can be effectively reinforced by one reinforcing plate 60 even when they are separated in the length direction.

In the above-described embodiment, the first horizontal plate 8c is the lower plate and the second horizontal plate 8d is the upper plate, but the first horizontal plate 8c is the upper plate and the second horizontal plate 8d is the lower plate. It may be. In this case, the pivot member fixed to the outer surface (upper surface) of the upper plate becomes the first pivot member 27, and the pivot member fixed to the outer surface (lower surface) of the lower plate becomes the second pivot member 28. Further, the arm cylinder 21 becomes the first hydraulic cylinder, and the boom cylinder 20 becomes the second hydraulic cylinder. Further, the reinforcing plate 60 has a configuration in which the first support portion 61A abuts on the inner surface of the upper plate and the second support portion 62A abuts on the inner surface of the lower plate.

Further, in the case of the above-described embodiment, the reinforcing plate 60 (front reinforcing plate 60A, rear reinforcing plate 60B) includes a first support portion 61A, a second support portion 62A, a first bending portion 63B, and a second bending portion 64B. Although it has a connecting portion 65B, the reinforcing plate 60 may have at least a first supporting portion 61A and a first bent portion 63B. That is, the reinforcing plate 60 may be a plate bent in a substantially L shape. Hereinafter, an example of modification in the case where the front reinforcing plate 60A is a plate bent in a substantially L shape will be described. Although the description of the rear reinforcing plate 60B is omitted, the same modification as that of the front reinforcing plate 60A can be adopted.

7 and 8 show an example of modification when the front reinforcing plate 60A is a plate bent in a substantially L shape. The front reinforcing plate 60A in these modified examples is composed of a first support portion 61A, a first bending portion 63A, and a first extending portion 66A.
In the modification shown in FIG. 7 (first modification), the first horizontal plate 8c is the lower plate and the second horizontal plate 8d is the upper plate. In the first modification, the first support portion 61A is in contact with the inner surface (upper surface) of the first horizontal plate (lower plate) 8c. The first support portion 61A is fixed to the inner surface of the first horizontal plate 8c by welding or the like. The first bent portion 63A bends from the first support portion 61A toward the second horizontal plate (upper plate) 8d side and overlaps with the front portion of the first pivot member 27 via the first horizontal plate 8c. It is close to the inner surface of the first horizontal plate 8c. The first bent portion 63A is bent at an acute angle. The first support portion 61A extends from the first bent portion 63A along the inner surface of the first horizontal plate 8c in a direction away from the pivot portion 271 (a direction away from the first pivot 51). The first extending portion 66A extends from the first bent portion 63A toward the second horizontal plate 8d side and is in contact with the inner surface (lower surface) of the second horizontal plate 8d. The first extending portion 66A may be connected to the inner surface of the second horizontal plate 8d by welding or the like.

In the modification shown in FIG. 8 (second modification), the first horizontal plate 8c is the upper plate and the second horizontal plate 8d is the lower plate. Further, the pivot member fixed to the outer surface (upper surface) of the first horizontal plate 8c is the first pivot member 27, and the pivot member fixed to the outer surface (lower surface) of the second horizontal plate 8d is the second pivot. It is a support member 28. Further, the arm cylinder 21 is the first hydraulic cylinder and the boom cylinder 20 is the second hydraulic cylinder.

In the second modification, the first support portion 61A is in contact with the inner surface (lower surface) of the first horizontal plate (upper plate) 8c. The first support portion 61A is fixed to the inner surface of the first horizontal plate 8c by welding or the like. The first bent portion 63A bends from the first support portion 61A toward the second horizontal plate (lower plate) 8d side and overlaps with the front portion of the first pivot member 27 via the first horizontal plate 8c. It is close to the inner surface of the first horizontal plate 8c. The first bent portion 63A is bent in an obtuse angle. The first support portion 61A extends from the first bent portion 63A along the inner surface of the first horizontal plate 8c in a direction away from the second pivot portion 281 (a direction away from the third pivot 53). The first extending portion 66A extends from the first bent portion 63A toward the second horizontal plate 8d side and is in contact with the inner surface of the second horizontal plate 8d. The first extending portion 66A may be connected to the inner surface of the second horizontal plate 8d by welding or the like.

<Boom tip shape>
Next, the tip shape of the boom 8 will be described with reference to FIGS. 9 to 13.
The front shaft support portion 83 provided on the tip end side of the boom 8 has a first bearing portion 85, a second bearing portion 86, and a connection portion 87.
The first bearing portion 85 extends forward from the tip of the boom main body 81 on one side (right side) in the width direction of the machine body. The second bearing portion 86 extends forward from the tip of the boom main body 81 on the other side (left side) in the width direction of the machine body. The first bearing portion 85 supports one end side (right side) of the second horizontal shaft (axial support shaft) 32. The second bearing portion 86 supports the other end side (left side) of the second horizontal shaft 32.

The connecting portion 87 connects the first bearing portion 85 and the second bearing portion 86. Specifically, the connecting portion 87 connects the rear portion of the inner surface (left surface) of the first bearing portion 85 and the rear portion of the inner surface (right surface) of the second bearing portion 86. In other words, the first bearing portion 85 and the second bearing portion 86 are bifurcated from the connecting portion 87 and extend forward.
As shown in FIGS. 9, 11 and 12, the upper surface 87a of the connecting portion 87 is formed on an inclined surface that shifts downward as it goes forward. The upper surface 87a of the connecting portion 87 is formed with a first concave portion 88 that is recessed downward (toward the lower surface 87b side). In other words, the first recess 88 is formed on the upper surface 87a, which is an inclined surface. As shown in FIG. 11, the first recess 88 is recessed in the direction (front-back direction) from the base end side to the tip end side of the boom 8. Further, as shown in FIG. 12, the first recess 88 is also recessed in the width direction (body width direction) from the first bearing portion 85 to the second bearing portion 86.

As shown in FIG. 11, due to the provision of the first recess 88, the upper surface 87a has a first inclined portion 87f having a large (steep) inclination in the front-rear direction and an inclination more than the first inclined portion 87f. A small (gentle) second inclined portion 87 g is formed. Both the first inclined portion 87f and the second inclined portion 87g are inclined with respect to the extending direction (length direction) of the boom 8.
Further, as shown in FIG. 12, the upper surface 87a has a first curved surface 87h that becomes lower toward the other on one side in the width direction of the airframe, and a second curved surface 87i that becomes lower toward the other side. Has a flat surface 87j in the center, which connects the first curved surface 87e and the second curved surface 87f.

The first recess 88 is provided with a holding portion 30 for holding the first hydraulic hose 38. As shown in FIGS. 11 and 12, the holding portion 30 is attached to the bottom portion (the most recessed portion) of the recess of the first recess 88. Specifically, as shown in FIG. 11, the holding portion 30 is attached to the boundary portion between the first inclined portion 87f and the second inclined portion 87g in the front-rear direction. Further, as shown in FIG. 12, the holding portion 30 is provided on the flat surface 87j in the body width direction.

The holding portion 30 has a substrate 30a and a holding body 30b. The substrate 30a is fixed to the first recess 88 by a fixture (bolt) 30c. As shown in FIGS. 11 to 13, the holding body 30b is held in the vicinity of the first recess 88 by pressing the first hydraulic hose 38 from above (regulating the upward movement). In the case of the present embodiment, the holding unit 30 holds two hydraulic hoses, but may be capable of holding three or more hydraulic hoses.

As shown in FIGS. 10 and 11, the lower surface 87b of the connecting portion 87 is formed on an inclined surface that is inclined with respect to the extending direction (length direction) of the boom 8. Specifically, the lower surface 87b is formed on an inclined surface that shifts upward as it goes forward. A second recess 89 that is recessed upward (toward the upper surface 87a) in the width direction of the machine body is formed on the inclined surface. As shown in FIG. 12, due to the provision of the second recess 89, the lower surface 87b has a third curved surface 87k that becomes lower on one side toward the other in the width direction of the airframe, and one on the other side. It has a fourth curved surface 87m that becomes lower toward the center, and has a flat surface 87n that connects the third curved surface 87k and the fourth curved surface 87m in the center.

As shown in FIG. 11, the rear end portion 87c of the inclined surface formed on the upper surface 87a of the connecting portion 87 is located behind the rear end portion 87d of the inclined surface formed on the lower surface 87b of the connecting portion 87. There is. In other words, the inclination angle of the upper surface 87a (inclination angle of the boom body 81 with respect to the upper surface) is formed more gently than the inclination angle of the lower surface 87b (inclination angle of the boom body 81 with respect to the lower surface). However, the inclination angle of the upper surface 87a and the inclination angle of the lower surface 87b may be formed to be the same.

As shown in FIG. 11, the connecting portion 87 extends forward in the vicinity of the middle in the vertical direction between the first bearing portion 85 and the second bearing portion 86. The front end 87e of the connecting portion 87 is located below the first straight line (virtual straight line) L1 connecting the upper end of the second horizontal axis (axial support shaft) 32 and the midpoint 81M in the vertical direction of the rear end of the front shaft support 83. are doing. Further, the front end 87e of the connecting portion 87 is located above the second straight line (virtual straight line) L2 connecting the lower end of the second horizontal axis 32 and the middle point 81M. Further, the front end 87e of the connecting portion 87 is located below the third straight line (virtual straight line) L3 connecting the axis 32C of the second horizontal axis 32 and the midpoint 81M in the vertical direction of the rear end of the front shaft branch 83. ing. However, the front end 87e of the connecting portion 87 may be located on the third straight line L3 instead of below the third straight line L3, or may be located above the third straight line L3.

As shown in FIGS. 11 and 13, the first hydraulic hose 38 extending forward along the upper surface of the boom main body 81 (the upper surface of the second horizontal plate 8d) is held by the holding portion 30. , The hose is guided forward and downward (diagonally forward and downward) along the upper surface 87a of the connecting portion 87. The first hydraulic hose 38 guided along the upper surface 87a of the connecting portion 87 passes between the front end 87e of the connecting portion 87 and the second horizontal shaft 32, and the left plate 29L and the right plate of the third pivot member 29 pass. After being guided to and from 29R, it is connected to the work tool cylinder 22.

In the case of the present embodiment, the first hydraulic hose 38 is guided along the upper surface 87a of the connecting portion 87, but since a sufficient space is secured above the connecting portion 87 by the first recess 88, the first hydraulic hose 38 is guided. In addition to the 1 hydraulic hose 38, the 2nd hydraulic hose 39 can also be guided along the upper surface 87a. That is, the second hydraulic hose 39 can be arranged through the outside of the front shaft branch 83 (outside the machine body) (see FIG. 1), or can be arranged along the upper surface 87a of the connecting portion 87. You can also. Further, in the case of the present embodiment, the connecting portion 87 has recesses on both the upper surface 87a and the lower surface 87b, but it is sufficient that the connecting portion 87 has recesses on at least one surface of the upper surface 87a and the lower surface 87b. That is, a configuration having a recess only on the upper surface 87a or a configuration having a recess only on the lower surface 87b may be used.

<Cover support structure>
As shown in FIGS. 14, 15, and 40, a cover 41 is provided on one side of the machine body 2 in the width direction. Specifically, the cover 41 is located on the right side of the airframe 2 and is provided on the right side of the cabin 3, as shown in the virtual line of FIG. 40, above and outside the airframe (with the right front part of the airframe 2 as a fulcrum). It can be opened toward the right outside). A grip portion 41a that can be gripped when an operator opens the cover 41 is provided on the right rear portion of the cover 41.

As shown in FIG. 15, the cover 41 covers the upper side, the right side, and the front side of the hydraulic oil tank 15 and the control valve 26. The hydraulic oil tank 15 is mounted on the right rear portion of the swivel board 11. The hydraulic oil tank 15 has a substantially rectangular parallelepiped shape, and the height direction is longer than the front-rear direction and the machine body width direction. That is, the hydraulic oil tank 15 is arranged vertically. A control valve 26 is attached to the front surface of the hydraulic oil tank 15 via a mounting bracket 46. The control valve 26 is a valve unit in which a plurality of valves are arranged and integrated, and the plurality of valves are arranged side by side in the height direction (vertical direction). That is, the control valve 26 is arranged vertically.

The plurality of valves constituting the control valve 26 are a swing control valve that controls the supply of hydraulic oil to the swing cylinder 19, a boom control valve that controls the supply of hydraulic oil to the boom cylinder 20, and an arm cylinder 21. An arm control valve that controls the supply of hydraulic oil, a work tool control valve that controls the supply of hydraulic oil to the work tool cylinder 22, a dozer control valve that controls the supply of hydraulic oil to the dozer cylinder 37, and a swivel motor. A turning control valve that controls the supply of hydraulic oil to the traveling device 4, a traveling control valve that controls the supply of hydraulic oil to the traveling motor of the traveling device 4, and a service port control that controls the supply of hydraulic oil to the hydraulic attachment. Valves, etc.

As shown in FIGS. 15 and 16, a support member 150 is provided in front of the control valve 26. The support member 150 is provided on one side in the width direction of the machine body. Specifically, the support member 150 is provided on the right front portion of the machine body 2. The upper part, the right side (one side in the width direction of the machine body), and the front side of the support member 150 are covered with the cover 41.
As shown in FIGS. 16 to 19, the support member 150 includes a first support member 151 and a second support member 152.

As shown in FIG. 16, the first support member 151 is attached to the machine body 2 via the foundation member 159. The base member 159 is composed of a bracket 160 and a base plate 161. The bracket 160 is fixed to the machine body 2. Specifically, the bracket 160 is fixed to the side surface (right surface) on the outer side of the vertical rib 11a extending in the front-rear direction on the swivel board 11. The base plate 161 is bolted to the upper part of the bracket 160 and extends toward the outside (right side) of the machine body. A first support member 151 is attached to the base plate 161.

As shown in FIGS. 17 to 19, the first support member 151 has a substrate portion 151a and a first plate portion 151b.
The substrate portion 151a is connected to the upper surface of the base plate 161 by a connecting member (bolt) 158, and extends rearward (toward the control valve 26 side). As shown in FIGS. 18 and 19, the substrate portion 151a is provided with a fourth hole 151d. The fourth hole 151d is an elongated hole formed so that the length in the front-rear direction is longer than the length in the width direction of the machine body. The fourth hole 151d penetrates the substrate portion 151a in the vertical direction. An insertion portion (screw shaft) 159a of the connecting member 158 is inserted into the fourth hole 151d. The insertion portion 159a of the connecting member 158 is screwed into the fifth hole (screw hole) 161a provided in the base plate 161.

As shown in FIGS. 18 and 19, a first hole 151c is formed in the first plate portion 151b. The first hole 151c is a screw hole that penetrates the first plate portion 151b in the vertical direction. The first plate portion 151b is connected to the upper surface of the rear portion of the substrate portion 151a by welding or the like, and extends rearward from the substrate portion 151a. In the case of the present embodiment, the substrate portion 151a and the first plate portion 151b are composed of separate members, but may be composed of one member.

A support 162 is fixed to the upper surface of the first support member 151 (the upper surface of the substrate portion 151a). The support 162 supports a fulcrum shaft 163 that serves as an opening / closing fulcrum of the cover 41. The fulcrum shaft 163 is arranged substantially parallel (approximately horizontally) to the upper surface of the swivel substrate 11. As shown in FIG. 5, the fulcrum shaft 163 extends in the direction of shifting to the rear K4 toward the outer K3 of the fuselage. One end side of the coil spring 164 is fixed to the fulcrum shaft 163. The other end of the coil spring 164 is fixed to the support 162. The coil spring 164 urges the fulcrum shaft 163 in one direction around the axis (direction in which the cover 41 closes).

As shown in FIG. 16, a rocking body 165 is attached to the fulcrum shaft 163. The rocking body 165 swings around the axis of the fulcrum shaft 163. The rocking body 165 has a fulcrum shaft mounting portion 165a, an extending portion 165b, and a mounting plate 165c. The fulcrum shaft mounting portion 165a is mounted on one end side (outside side of the machine body) of the fulcrum shaft 163. The extending portion 165b includes a lateral extending portion 165b1 and a vertically extending portion 165b2. The laterally extending portion 165b1 extends outward and rearward from the fulcrum shaft mounting portion 165a. The vertically extending portion 165b2 extends upward from the extending end of the lateral extending portion 165b1. The mounting plate 165c is fixed to the upper portion and the lower portion of the vertically extending portion 165b2, respectively. The mounting plate 165c is bolted to the inner surface of the right front portion of the cover 41. As a result, the cover 41 is attached to the rocking body 165.

When opening the cover 41, the grip portion 41a is gripped and the rear portion of the cover 41 is lifted. Then, the rocking body 165 fixed to the front portion of the cover 41 swings in the other direction around the axis of the fulcrum shaft 163 so as to move from the state of standing substantially vertically to the front and the lower side. As a result, the cover 41 is opened forward and upward (see the virtual line in FIG. 40). When closing the cover 41, the rocking body 165 is swung in one direction around the axis of the fulcrum shaft 163 toward the rear and upper sides by pushing down the rear portion of the cover 41.

As shown in FIG. 16, the mounting shaft 155 is fixed to the lower surface of the first support member 151 (the lower surface of the first plate portion 151b). A stopper plate 156 is rotatably attached to the mounting shaft 155 around the axis of the mounting shaft 155. The stopper plate 156 regulates the rotation range when opening and closing the cover 41. Although not shown, the stopper plate 156 has an elongated hole, and a protruding shaft provided in the fulcrum shaft mounting portion 165a is movably inserted into the elongated hole. The protruding shaft can move along the elongated hole as the rocking body 165 swings, and the rotation range of the cover 41 is regulated by the movable range (length of the elongated hole).

As shown in FIGS. 17 and 18, the second support member 152 is attached to the first support member 151. The second support member 152 is formed in a substantially L shape having a horizontal portion (second plate portion) 152a and a vertical portion 152b, and the horizontal portion 152a is attached to the first support member 151. A second hole 152c is formed in the horizontal portion 152a. The second hole 152c penetrates the horizontal portion 152a in the vertical direction. The number of the second holes 152c is the same as that of the first holes 151c provided in the first support member 151, and is two in the present embodiment. The vertical portion 152b is provided with a mounting portion 152d. As shown in FIG. 16, a switching valve 170 is attached to the attachment portion 152d. The mounting portion 152d has a mounting hole 152e, and the switching valve 170 is mounted by a bolt inserted into the mounting hole 152e. As shown in FIG. 15, the upper side, the right side (one side in the body width direction), and the front side of the switching valve 170 are covered with the cover 41.

The switching valve 170 is composed of a three-way switching valve. The switching valve 170 is a valve that switches the state of the hydraulic oil supply path for a hydraulic device (for example, a hydraulic attachment or the like). In the case of the present embodiment, the switching valve 170 is a so-called third line valve, which enables the hydraulic oil to be returned to the hydraulic oil tank 15 by the switching operation without going through the control valve 26. However, the switching valve 170 may be a valve other than the third line valve.

As shown in FIG. 16, the switching valve 170 has an inlet port 171, a first outlet port 172, a second outlet port 173, and an operation handle 174. By operating the operation handle 174, the switching valve 170 has a first state in which the destination of the hydraulic oil introduced from the inlet port 171 is the first outlet port 172 and a second state in which the destination is the second outlet port 173. Can be switched to.

A third hydraulic hose 175 is connected to the inlet port 171. The third hydraulic hose 175 is connected to a hydraulic device (for example, a hydraulic attachment or the like), and constitutes a return oil passage for returning hydraulic oil from the hydraulic device to the hydraulic oil tank 15. A fourth hydraulic hose 176 is connected to the first outlet port 172. The fourth hydraulic hose 176 is connected to the inlet port of the control valve 26. A fifth hydraulic hose 177 is connected to the second outlet port 173. The fifth hydraulic hose 177 is connected to the hydraulic oil tank 15.

When the operation handle 174 is switched to the first state, the hydraulic oil introduced from the inlet port 171 through the third hydraulic hose 175 exits from the first outlet port 172 and passes through the fourth hydraulic hose 176 to the control valve 26. enter. When the operation handle 174 is switched to the second state, the hydraulic oil introduced from the inlet port 171 exits from the second outlet port 173, passes through the fifth hydraulic hose 177, and enters the hydraulic oil tank 15 without entering the control valve 26. Return to.

As shown in FIGS. 17 and 18, the first support member 151 and the second support member 152 are connected by a connecting member 178. The connecting member 178 has an insertion portion 178a to be inserted into the first hole 151c and the second hole 152c. In the case of this embodiment, the connecting member 178 is a bolt, and the insertion portion 178a is a screw shaft of the bolt.
The connection between the first support member 151 and the second support member 152 by the connecting member 178 (attachment of the second support member 152 to the first support member 151) is a horizontal portion (second plate portion) of the second support member 152. The 152a is overlapped above (or below) the first plate portion 151b of the first support member 151. Specifically, the first hole 151c and the second hole 152c are overlapped, the insertion portion 178a of the connecting member 178 is inserted into the second hole 152c, and the insertion portion 178a is screwed into the first hole 151c which is a screw hole. It is done by doing. The first hole 151c is a through hole that is not a screw hole, and a nut is screwed into the insertion portion 178a inserted into the through hole to connect the first support member 151 and the second support member 152. May be good.

The support member 150 can be assembled to the machine body 2 after the first support member 151 and the second support member 152 are connected (sub-assembled) by the connecting member 178.
At least one of the first support member 151 and the second support member 152 has a position adjusting portion 153. The position adjusting unit 153 makes it possible to adjust the relative positions of the first support member 151 and the second support member 152. In other words, the position adjusting unit 153 makes it possible to adjust the position of the second support member 152 with respect to the first support member 151.

The position adjusting unit 153 includes at least one of a first hole 151c provided in the first support member 151 and a second hole 152c provided in the second support member 152. The hole (at least one of the first hole 151c and the second hole 152c) is formed to have a play gap (clearance) with respect to the outer diameter of the insertion portion 178a of the connecting member 178. That is, the position adjusting portion 153 includes a hole formed in a size having a play gap with respect to the outer diameter of the inserting portion 178a. In the case of the present embodiment, since the first hole 151c is a screw hole, the second hole 152c is formed to have a play gap (that is, the second hole 152c is included in the position adjusting portion 153). When the first hole 151c is a through hole other than a screw hole (when a nut is used), one or both of the first hole 151c and the second hole 152c are allowed to play with respect to the outer diameter of the insertion portion 178a. It can be formed into a size having a gap. In this case, either one or both of the first hole 151c and the second hole 152c is included in the position adjusting unit 153.

The method of forming the first hole 151c and / or the second hole 152c to a size having a play gap is, for example, a method of making the diameter (inner diameter) of the circular hole larger than the outer diameter of the insertion portion 178a, or the shape of the hole. There is a method of forming a shape other than a circular shape such as an elongated hole. In the case of this embodiment, the latter method is adopted. Specifically, the first hole 151c is a screw hole, and one of the two second holes 152c is an elongated hole.

The number of the first hole 151c and the second hole 152c may be one, but is preferably a plurality. When the number of the first hole 151c and the number of the second hole 152c is plurality, at least one or more of the holes may be formed in a size having a play gap. In the case of the present embodiment, one of the two second holes 152c, the second hole 152c1, is formed in a size having a play gap. Further, when the number of the first hole 151c and the number of the second holes 152c is plurality, it is preferable to form the plurality of holes side by side in the width direction of the machine body. In the case of the present embodiment, the two first holes 151c are formed side by side in the body width direction, and the two second holes 152c are also formed side by side in the body width direction.

Hereinafter, the operation of the position adjusting unit 153 will be described with reference to FIG.
FIG. 19 shows a case where two first holes 151c are formed as screw holes, and one of the two second holes 152c (on the side of the machine body) 152c1 is formed to have a play gap CL1. ing. The second hole 152c1 is formed as an elongated hole whose front-rear direction is longer than that of the machine body width direction. In FIG. 19, the solid line shows the state in which the rear part of the second hole 152c1 overlaps the first hole 151c, and the virtual line shows the state in which the front part of the second hole 152c1 overlaps the first hole 151c. The outer diameter of the insertion portion 178a of the connecting member 178 overlaps with the inner diameter of the first hole 151c, and a play gap CL1 is formed between the insertion portion 178a and the second hole 152c1. By forming the play gap CL1 in this way, the position of the second hole 152c1 with respect to the first hole 151c can be shifted from the solid line position to the virtual line position. That is, the position of the second support member 152 with respect to the first support member 151 can be adjusted. Specifically, the rotational movement of the second plate portion 152c with respect to the first plate portion 151b can be allowed.

Although not shown, by forming both of the two second holes 152c into elongated holes, linear movement of the second plate portion 152c with respect to the first plate portion 151b can be allowed. That is, the play gap CL1 may allow rotational movement of the second support member 152 with respect to the first support member 151, may allow linear movement, or allow both movements. It may be something to do. The movement of the second support member 152 with respect to the first support member 151 preferably includes movement in the width direction of the machine body (outside the machine body or inside the machine body) regardless of whether it is a rotational movement or a linear movement.

As shown in FIG. 16, a fulcrum shaft 163 that serves as an opening / closing fulcrum of the cover 41 is attached to the first support member 151. A switching valve 170 is attached to the second support member 152. Therefore, by adjusting the relative positions of the first support member 151 and the second support member 152, the relative positions of the fulcrum shaft 163 and the switching valve 170 can be adjusted.
The first support member 151 has a second position adjusting portion 154. The second position adjusting unit 154 makes it possible to adjust the position of the first support member 151 with respect to the machine body 2. Specifically, the second position adjusting unit 154 makes it possible to adjust the position of the first support member 151 with respect to the foundation member 159 (base plate 161).

The second position adjusting unit 154 includes a fourth hole 151d provided in the first support member 151.
The connecting member 158 that connects the first support member 151 and the foundation member 159 (base plate 161) has an insertion portion 158a that is inserted into the fourth hole 151d and the fifth hole 161a. As described above, in the case of the present embodiment, the connecting member 158 is a bolt, and the insertion portion 158a is a screw shaft of the bolt. Further, the fourth hole 151d is an elongated hole, and the fifth hole 161a is a screw hole.

As shown in FIG. 20, a play gap CL2 is formed between the insertion portion 158a of the connecting member 158 and the fourth hole 151d. In other words, the fourth hole 151d constituting the second position adjusting portion 154 is formed in a size having a play gap with respect to the outer diameter of the insertion portion (screw shaft) 158a. In FIG. 20, the solid line shows the state in which the rear portion of the fourth hole 151d overlaps the screw hole 161a, and the virtual line shows the state in which the front portion of the fourth hole 151d overlaps the screw hole 161a. A play gap CL2 is formed between the insertion portion 158a and the fourth hole 151d. By forming the play gap CL2 in this way, the position of the fourth hole 151d with respect to the screw hole 161a can be shifted from the solid line position to the virtual line position. That is, by using the play gap CL2, the position of the fourth hole 151d with respect to the screw hole 161a can be adjusted. Thereby, the position of the first support member 151 with respect to the base member 159 can be adjusted. Therefore, the position of the fulcrum shaft 163 and the position of the cover 41 with respect to the machine body 2 can be adjusted.

In the example shown in FIG. 20, the second position adjusting unit 154 adjusts the position of the first support member 151 with respect to the foundation member 159 by linear movement, but instead of or in addition to the adjustment by linear movement, Adjustment by rotational movement may be possible. The change in the moving direction can be realized by changing the shape and size of the fourth hole 151d provided in the substrate portion 151a.

<Bonnet locking structure>
As shown in FIGS. 21, 22, and 40, a bonnet 43 is provided at the rear of the machine body 2. The bonnet 43 is provided so as to be openable and closable with respect to the airframe 2, and covers the rear of the prime mover 13.
As shown in FIGS. 21 to 23, the bonnet 43 is supported by the support legs 70 erected at the rear portion of the swivel board 11. The support leg 70 is composed of a first leg 71, a second leg 72, a third leg 73, a fourth leg 74, and a support base 75. The first leg 71 is erected on the right front side of the prime mover 13. The second leg 72 is erected on the left front side of the prime mover 13. The third leg 73 is erected on the right rear side of the prime mover 13. The fourth leg 74 is erected on the left rear side of the prime mover 13. The upper portions of the first leg 71 and the second leg 72 are bent rearward. The upper parts of the third leg 73 and the fourth leg 74 are bent forward. The support base 75 extends in the width direction of the machine body, and connects the upper part of the first leg 71, the upper part of the second leg 72, the upper part of the third leg 73, and the upper part of the fourth leg 74.

As shown in FIGS. 23 and 24, a rotation support member 44 forming a rotation fulcrum of the bonnet 43 is attached to the fourth leg 74. The rotation support member 44 has a first fixing portion 44a, a second fixing portion 44b, a movable portion 44c, and a support shaft 44d. The first fixing portion 44a is fixed to the rear surface of the fourth leg 74. The second fixing portion 44b is fixed to the inner surface of the second cover 42 provided on the left side of the bonnet 43. The movable portion 44c is bent in a substantially U shape in a plan view. One end of the movable portion 44c is connected to the fixed portion 44a via a support shaft 44d. The other end of the movable portion 44c is fixed to the inner surface of the left portion of the bonnet 43 via the mounting plate 44e. The support shaft 44d extends in the vertical direction. As a result, as shown in FIGS. 24 and 25, the movable portion 44c can rotate forward or backward around the support shaft 44d. More specifically, the movable portion 44c rotates rearward around the support shaft 44d, so that the bonnet 43 rotates rearward and is opened (see FIG. 25). When the movable portion 44c rotates forward around the support shaft 44d, the bonnet 43 rotates forward and is closed (see FIG. 24).

As shown in FIGS. 22 to 25, a locking piece 80 is provided on one side (left portion) of the bonnet 43 in the body width direction. The locking piece 80 is composed of a hook that is curved like a hook in a plan view. As shown in FIGS. 22 and 26, the locking piece 80 projects forward (in the direction away from the bonnet 43) from the accommodating cover 77 provided on the bonnet 43. The protruding portion (front end portion) of the locking piece 80 from the accommodating cover 77 is locked to the locking shaft 925 of the receiving member 90 described later.

As shown in FIG. 26, the rear end portion of the locking piece 80 is fixed to the operation plate 78 housed in the housing cover 77. The operation plate 78 is rotatably supported by the accommodation cover 77 via the vertical axis 79. As shown in FIG. 28, by rotating the operation plate 78 around the vertical axis 79, the locking piece 80 rotates integrally with the operation plate 78 around the vertical axis 79. As shown in FIG. 21, the operation plate 78 is exposed on the rear surface of the bonnet 43, and can be manually rotated from the rear surface.

As shown in FIG. 26, the first plate 96 is fixed to the lower part of the front surface of the accommodation cover 77. A second plate 97 is attached to the first plate 96 by bolts 98. The first plate 97 and the second plate 97 may be composed of one member. An insertion plate 95 is fixed to the second plate 97. The insertion plate 95 is arranged with one side facing upward and the other side facing downward, and extends in a direction away from the bonnet 43. The insertion plate 95 is located below the locking piece 80. The insertion plate 95 is inserted into the slit 923 of the receiving member 90, which will be described later.

As shown in FIGS. 22 to 25, the airframe 2 is provided with a receiving member 90 to which the locking piece 80 is locked when the bonnet 43 is closed. The receiving member 90 is attached to the support leg 70. By locking the locking piece 80 to the receiving member 90, the closed state of the bonnet 43 is maintained.
As shown in FIGS. 26, 27, 29, and 30, the receiving member 90 includes a first receiving member 91 and a second receiving member 92.

The first receiving member 91 is attached to the rear surface of the third leg 73 erected on the right rear portion of the machine body 2. As shown in FIGS. 29 and 30, the first receiving member 91 has a first mounting portion 911 and a second mounting portion 912. The first mounting portion 911 and the second mounting portion 912 are formed by bending one plate at a substantially right angle. One side of the first mounting portion 911 faces forward and the other side faces rearward. The second mounting portion 912 has one side facing left and the other side facing right.

As shown in FIG. 30, the first mounting portion 911 is mounted on the rear surface of the third leg 73 by bolts 99. A second receiving member 92 is attached to the second attachment portion 912. As shown in FIGS. 27 and 29, the second mounting portion 912 has protruding portions 912a and 912b protruding rearward. The protrusion 912a is provided on the upper portion of the first receiving member 91. The protruding portion 912b is provided at the lower part of the first receiving member 91. First holes 91a are formed in the protrusions 912a and 912b, respectively. That is, the first hole 91a is formed in the upper part and the lower part of the second mounting portion 912, respectively.

As shown in FIGS. 26, 30 and the like, the second receiving member 92 has a flat plate shape, with one side facing left and the other side facing right. The second receiving member 92 extends rearward (from the body 2 side toward the bonnet 43 side). The second receiving member 92 has a mounting portion 921, a locking portion 922, and a slit 923. The mounting portion 921 is provided on the upper portion and the lower portion of the second receiving member 92, and is mounted on the second mounting portion 912 of the first receiving member 91. A second hole 92a is formed in each mounting portion 921. The number of the second holes 92a is the same as the number of the first holes 91a provided in the first receiving member 91, and is two in the case of the present embodiment.

As shown in FIGS. 26, 29, and 30, the first receiving member 91 and the second receiving member 92 are connected by a connecting member 94. The connecting member 94 has a bolt 94a, a nut 94b, and a washer 94c. The connection between the first receiving member 91 and the second receiving member 92 by the connecting member 94 (attachment of the second receiving member 92 to the first receiving member 91) is one surface (left surface) of the attachment portion 921 of the second receiving member 92. ) Is superimposed on the other surface (right surface) of the second mounting portion 912 of the first receiving member 91. Specifically, the first hole 91a, the second hole 92a, and the washer 94c are overlapped with each other, the screw shaft 94d of the bolt 94a is inserted, and the nut 94b is screwed into the screw shaft 94d. Hereinafter, the screw shaft 94d is referred to as an insertion portion 94d.

As shown in FIGS. 26 and 30, the locking portion 922 of the second receiving member 92 has a recess 924 and a locking shaft 925.
The recess 924 is formed by cutting out the trailing edge (edge on the bonnet 43 side) of the second receiving member 92 toward the front (from the bonnet 43 side toward the machine body 2 side). The recess 924 is formed in a substantially rectangular shape, and has an upper edge 924a, a lower edge 924b, and a leading edge 924c. The upper edge 924a and the lower edge 924b extend in the front-rear direction in parallel with each other. The leading edge 924c extends in the vertical direction and connects the front portion of the upper edge 924a and the front portion of the lower edge 924b.

The locking shaft 925 is a columnar shaft extending in the vertical direction on the rear side (bonnet 43 side) of the recess 924. As shown in FIG. 30, the locking shaft 925 is fixed to the other surface (right surface) of the second receiving member 92 by welding or the like. The upper portion of the locking shaft 925 is fixed above the rear portion of the upper edge 924a of the recess 924. The lower portion of the locking shaft 925 is fixed below the rear portion of the lower edge 924b of the recess 924. The inner edge (upper edge 924a, lower edge 924b, front edge 924c) of the recess 924 and the locking shaft 925 form a substantially rectangular space 926 into which the tip of the locking piece 80 is inserted.

As shown in FIG. 28, the locking shaft 925 and the vertical axis 79 are arranged side by side in a direction parallel to the extending direction (front-back direction) of the second receiving member 92 when the bonnet 43 is closed. In FIG. 28, the arrangement direction of the locking shaft 925 and the vertical axis 79 is indicated by the alternate long and short dash line L.
As shown in FIGS. 27 and 28, the locking piece 80 is locked to the locking portion 922. Specifically, the locking piece 80 is locked to the locking shaft 925 of the locking portion 922. By locking the locking piece 80 to the locking shaft 925, the closed state of the bonnet 43 can be maintained. The bonnet 43 can be opened by releasing the locking piece 80 from the receiving member 90.

Locking and unlocking of the locking piece 80 with respect to the receiving member 90 can be performed by operating the operation plate 78. Specifically, as shown in FIG. 28, by swinging the operation plate 78, the locking piece 80 rotates with the operation shaft 79 as a fulcrum. When the locking piece 80 is rotated forward, the locking shaft 925 is switched from the released state (see the virtual line) to the locked state (see the solid line). On the other hand, when the locking piece 80 is rotated forward, the locking piece 80 is switched from the state of being locked to the locking shaft 925 (see the solid line) to the state of being released from the locking (see the virtual line). .. In FIG. 27, the state in which the locking piece 80 is locked to the locking shaft 925 is shown by a virtual line, and the state in which the locking piece 80 is released is shown by a solid line. As shown in FIG. 31, when the locking piece 80 is released from the locking shaft 925, the bonnet 43 can be opened.

As shown in FIGS. 26, 27, 29, and 30, a slit 923 is provided below the locking portion 922. The slit 923 is cut from the bonnet 43 side (rear side) toward the machine body 2 side (front side). The slit 923 is formed so that the bonnet 43 side is wider than the machine body 2 side. Specifically, as shown in FIG. 30, the slit 923 has an expansion portion 923a having a wider width on the bonnet 43 side. The expansion portion 923a is provided at the rear portion of the slit 923, and is formed so as to gradually increase in width toward the rear.

As shown in FIGS. 27 and 28, the insertion plate 95 is inserted into the slit 923 with the bonnet 43 closed. The insertion plate 95 has a function of suppressing vibration of the bonnet 43 when the bonnet 43 is closed. Further, by inserting the insertion plate 95 into the slit 923, the locking piece 80 is surely guided to an appropriate position (lockable position) with respect to the locking shaft 925. The expansion portion 923a functions as a guide when the insertion plate 95 is inserted into the slit 923. When the bonnet 43 is opened, the insertion plate 95 shifts from the state of being inserted into the slit 923 (see FIG. 28) to the state of being detached (see FIG. 31).

At least one of the first receiving member 91 and the second receiving member 92 has an adjusting portion 93. The adjusting unit 93 makes it possible to adjust the relative positions of the first receiving member 91 and the second receiving member 92. In other words, the adjusting unit 93 makes it possible to adjust the position of the second receiving member 92 with respect to the first receiving member 91. As shown in FIGS. 29 and 30, the adjusting unit 93 includes an upper adjusting unit 93A and a lower adjusting unit 93B. The upper adjusting portion 93A is provided above the locking portion 922. The lower adjusting portion 93B is provided below the locking portion 922. The slit 923 is located between the upper adjusting portion 93A and the lower adjusting portion 93B.

The adjusting portion 93 (upper adjusting portion 93A, lower adjusting portion 93B) is at least one of a first hole 91a provided in the first receiving member 91 and a second hole 92a provided in the second receiving member 92. Includes holes. The hole (at least one of the first hole 91a and the second hole 92a) is formed to have a play gap (clearance) with respect to the outer diameter of the insertion portion 94d of the bolt 94a. That is, the adjusting portion 93 includes a hole formed in a size having a play gap with respect to the outer diameter of the inserting portion 94d. This play gap allows the second receiving member 92 to move with respect to the first receiving member 91 in the vertical direction and the front-back direction.

The method of forming the first hole 91a and / or the second hole 92a to a size having a play gap is a method of making the diameter (inner diameter) of the circular hole larger than the outer diameter of the insertion portion 94d, or a method of lengthening the hole shape. Examples thereof include a method of forming a shape other than a circular shape such as a hole. In the case of this embodiment, the former method is adopted. Specifically, the first hole 91a and the second hole 92a are circular holes, the inner diameter of the first hole 91a is larger than the inner diameter of the second hole 92a, and there is a play gap with respect to the outer diameter of the insertion portion 94d. It is formed to the size.

As shown in FIG. 32, in the case of the present embodiment, of the first hole 91a and the second hole 92a, the first hole 91a is formed to have a size having a play gap CL3 with respect to the outer diameter of the insertion portion 94d. There is. In FIG. 32, the outer diameter of the insertion portion 94d overlaps with the inner diameter of the first hole 91a, and a play gap CL3 is formed between the insertion portion 94d and the first hole 91a. In this case, the position of the first hole 91a with respect to the insertion portion 94d can be adjusted. As a result, the position of the second receiving member 92 with respect to the first receiving member 91 can be adjusted by utilizing the play gap CL3. When the position of the second receiving member 92 with respect to the first receiving member 91 shown in FIG. 32 (b) is set as the reference position, FIG. 32 (a) shows the position of the second receiving member 92 behind the reference position (bonnet 43 side). ), FIG. 32 (c) shows a state in which the position of the second receiving member 92 is shifted to the front (airframe 2 side) from the reference position. In this way, the position of the second receiving member 92 with respect to the first receiving member 91 can be adjusted forward or backward. Further, although not shown, the position of the second receiving member 92 with respect to the first receiving member 91 can be adjusted upward or downward.

Here, the first receiving member 91 is fixed to the machine body 2, and the second receiving member 92 is provided with a locking portion 922. Therefore, by adjusting the position of the second receiving member 92 with respect to the first receiving member 91, the position of the locking portion 922 in the machine body 2 can be adjusted. Thereby, the position of the locking portion 922 with respect to the locking piece 80 provided on the bonnet 43 can be adjusted.

Further, at least one of the first receiving member 91 and the machine body 2 has a second adjusting portion capable of adjusting the relative positions of the first receiving member 91 and the machine body 2. The second adjusting portion includes at least one of a hole provided in the first mounting portion 911 of the first member 91 and a hole provided in the third leg 73 of the support leg 70. These holes are holes for attaching the first receiving member 91 to the third leg 73, and are holes through which the screw shaft of the bolt 99 shown in FIG. 30 is inserted.

At least one of the hole provided in the first mounting portion 911 and the hole provided in the third leg 73 has a size having a play gap (clearance) with respect to the outer diameter of the screw shaft of the bolt 99. Is formed in. That is, the second adjusting portion includes a hole formed in a size having a play gap with respect to the outer diameter of the screw shaft of the bolt 99. This play gap allows the first receiving member 91 to move with respect to the machine body 2 in the vertical direction and the horizontal direction.

<Belt tension adjustment device>
FIG. 33 is a view of the prime mover 13 as viewed from the output shaft (crankshaft, power transmission shaft) side. FIG. 34 is a view of the prime mover 13 from above.
A drive pulley 101 is attached to the output shaft 13a of the prime mover 13. The drive pulley 101 has two belt grooves arranged in the axial direction of the output shaft 13a. An endless (loop-shaped) belt (first belt 104 and second belt 107, which will be described later) is wound around each of the two belt grooves.

A fan pulley 102 is provided above the drive pulley 101. A fan 23 is connected to the fan pulley 102 (the fan 23 is not shown in FIG. 33). An input pulley 103 of the alternator 24 is provided in front of the fan pulley 102. The rotation axes of the drive pulley 101, the fan pulley 102, and the input pulley 103 are arranged in parallel with each other. The drive pulley 101, the fan pulley 102, and the input pulley 103 are arranged in a triangular shape when viewed from the output shaft 13a side. A belt (first belt) 104 is hung over the drive pulley 101, the fan pulley 102, and the input pulley 103. The power from the output shaft 13a of the prime mover 13 is transmitted from the drive pulley 101 to the fan pulley 102 and the input pulley 103 via the first belt 104. As a result, the fan 23 and the alternator 24 are driven by the drive of the prime mover 13.

A driven pulley 105 is provided above and behind the drive pulley 101. The driven pulley 105 is an input pulley provided in the compressor (driven device) 25. A tension pulley 106 is provided above the drive pulley 101 and in front of the driven pulley 105. The rotation axes of the drive pulley 101, the driven pulley 105, and the tension pulley 106 are arranged in parallel with each other. The drive pulley 101, the driven pulley 105, and the tension pulley 106 are arranged in a triangular shape when viewed from the output shaft 13a side. A belt (second belt) 107 is hung over the drive pulley 101, the driven pulley 105, and the tension pulley 106. The second belt 107 transmits the rotational driving force of the output shaft (power transmission shaft) 13a to the compressor (driven device) 25. The tension of the second belt 107 can be adjusted by the belt tension adjusting device 100.

Hereinafter, the configuration of the belt tension adjusting device 100 will be described mainly with reference to FIGS. 35 to 39.
The belt tension adjusting device 100 includes a support shaft 108, a bracket 110, a rotating member 120, and a rotation operating mechanism 130.
The support shaft 108 is provided above and to the left of the tension pulley 106, and is rotatably supported at a position different from the rotation shaft 106a of the tension pulley 106. The support shaft 108 is parallel to the rotating shaft 106a, and one end side is arranged on the tension pulley 106 side (right side) and the other end side is arranged on the opposite side (left side) of the tension pulley 106 side. The support shaft 108 is rotatably supported by the bracket 110.

As shown in FIGS. 33 and 34, the bracket 110 is arranged above the prime mover 13. As shown in FIGS. 35 and 36, the bracket 110 has a first main member 111, a second main member 112, a first sub-member 113, a second sub-member 114, and a third sub-member 115. The first main member 111, the second main member 112, the first sub-member 113, the second sub-member 114, and the third sub-member 115 are connected and integrated by welding or the like.

The first main member 111 is a plate-shaped member extending in the front-rear direction (direction orthogonal to the output shaft 13a), and one surface thereof faces right and the other surface faces left. As shown in FIGS. 33 to 35, one end side (front end side) of the first main member 111 is located above the compressor 25, and the other end side (rear end side) is above and to the left of the tension pulley 106. positioned. As shown in FIGS. 35 and 36, the first main member 111 has a first through hole 110a on one end side and a second through hole 110b on the other end side.

As shown in FIG. 36, the second main member 112 has an upper portion 112a, a front portion 112b, and a rear portion 112c. The upper part 112a, the front part 112b, and the rear part 112c are integrally formed by bending one strip-shaped plate. The upper portion 112a is connected to the other surface (left surface) of the first main member 111 and extends in the front-rear direction. The front portion 112b has a vertical portion that bends from the front portion of the upper portion 112a and extends downward, and a horizontal portion that bends from the lower end portion of the vertical portion and extends forward. A third through hole 110c is provided in the vertical portion of the front portion 112b. A fourth through hole 110d is provided in the lateral portion of the front portion 112b. The rear portion 112c has a vertical portion that bends from the rear portion of the upper portion 112a and extends downward, and a horizontal portion that bends from the lower end portion of the vertical portion and extends forward. A fifth through hole 110e is provided in the lateral portion of the rear portion 112c.

The first auxiliary member 113 extends in the body width direction (left-right direction). One end side (left side) of the first auxiliary member 113 is bent downward and connected to the other surface (left surface) of the first main member 111. A sixth through hole 110f is provided on the other end side (left side) of the first auxiliary member 113. As shown in FIGS. 35 and 37, a clamp 136 for holding a pipe connected to the compressor 25 is attached to the first auxiliary member 113.

The second auxiliary member 114 has an intermediate portion 114a, a right portion 114b, and a left portion 114c. The intermediate portion 114a is connected to the front portion 112b of the second main member 112 and extends in the body width direction. The right portion 114b bends from one end (right end) of the intermediate portion 114a and extends forward. The left portion 114c bends from the other end (left end) of the intermediate portion 114a and extends forward. A seventh through hole 110g is provided in the right portion 114b and the left portion 114c.

The third sub-member 115 is a plate-shaped member, one surface of which faces to the right and the other surface of which faces to the left. The third sub-member 115 is connected to the upper portion 112a of the second main member 112. As shown in FIG. 35, one surface (right surface) of the third sub-member 115 faces the other surface (left surface) of the first main member 111 with the upper portion 112a interposed therebetween. The third auxiliary member 115 has an eighth through hole 110h and an elongated hole 115a. The elongated hole 115a is located above the support shaft 108 and is formed in an arc shape centered on the support shaft 108.

As shown in FIGS. 35 and 36, the bracket 110 has a fixing portion 116, a supporting portion 117, and an inserting portion 118.
The fixing portion 116 includes a first fixing portion 116A fixed to the compressor 25 and a second fixing portion 116B fixed to the prime mover 13. The first fixing portion 116A includes a first through hole 110a, a third through hole 110c, and a seventh through hole 110g. The first fixing portion 116A inserts a bolt into the first through hole 110a, the third through hole 110c, and the seventh through hole 110g, and screwes the bolt into the female screw portion provided in the compressor 25, whereby the compressor 25 Is fixed to. The second fixing portion 116B includes a fourth through hole 110d, a fifth through hole 110e, and a sixth through hole 110f. The second fixing portion 116B inserts a bolt into the fourth through hole 110d, the fifth through hole 110e, and the sixth through hole 110f, and screwes the bolt into the female threaded portion provided in the prime mover 13, whereby the prime mover 13 Is fixed to.

The support portion 117 rotatably supports the support shaft 108. As shown in FIG. 35, the support portion 117 is composed of a tubular body extending in the machine body width direction (the axial direction of the rotation shaft 106a of the tension pulley). The tubular body constituting the support portion 117 is fitted and fixed in the second through hole 110b of the first main member 111 and the eighth through hole 110h of the third auxiliary member 115, and the support shaft 108 is the cylinder. It penetrates the body. Both ends of the support shaft 108 project from the tubular body (support portion) 117.

As shown in FIG. 35, the insertion portion 118 penetrates the upper portion (above the elongated hole 115a) of the third auxiliary member 115. The insertion portion 118 is composed of a screw shaft of the bolt 118a, and the screw shaft penetrates the third auxiliary member 115 and is inserted into the guide hole 131a of the movable member 131 described later. A nut 118b is screwed onto the screw shaft of the bolt 118a.
The rotating member 120 connects the support shaft 108 and the tension pulley 106, and changes the relative positions of the tension pulley 106 with respect to the drive pulley 101 and the driven pulley 105 as the support shaft 108 rotates. Specifically, the rotating member 120 moves the tension pulley 106 with the rotation of the support shaft 108. As shown in FIGS. 35 and 37, the rotating member 120 has a first portion 121 and a second portion 122. The first portion 121 is attached to one end side (right side) of the support shaft 108. Specifically, one end side of the support shaft 108 penetrates the first portion 121, and the nut 123 is screwed into the male screw formed in the penetrating portion. The second site 122 extends downward from the first site 121. The second portion 122 rotatably supports the rotation shaft 106a of the tension pulley 106.

Since the first portion 121 is attached to the support shaft 108, the first portion 121 rotates with the rotation of the support shaft 108. The second portion 122 rotates about the support shaft 108 as the first portion 121 rotates. Since the second portion 122 supports the rotation shaft 106a of the tension pulley 106, the tension pulley 106 rotates together with the second portion 122. That is, the tension pulley 106 rotates about the support shaft 108 as the support shaft 108 rotates. The rotation direction of the tension pulley 106 is determined according to the rotation direction of the support shaft 108.

The rotation operation mechanism 130 is a mechanism for rotating the support shaft 108 around the axis.
As shown in FIGS. 35 to 37, the rotation operation mechanism 130 includes a movable member 131 and an operation unit 132.
The movable member 131 is a plate-shaped member, one surface of which faces to the right and the other surface of which faces to the left. The movable member 131 has a fan shape when viewed from the axial direction of the support shaft 108. As shown in FIGS. 36 and 37, the movable member 131 is attached to the other end side (left side) of the support shaft 108. As a result, the movable member 131 can rotate together with the support shaft 108. As shown in FIG. 35 and the like, one surface (right surface) of the movable member 131 is in contact (or close to) the other surface (left surface) of the third sub-member 115.

The movable member 131 has a guide hole 131a. The guide hole 131a is formed in an arc shape centered on the support shaft 108. Both the guide hole 131a and the elongated hole 115a are formed in an arc shape centered on the support shaft 108, but the distance from the support shaft 108 (radius of curvature of the arc) is different. Specifically, the guide hole 131a is located above the elongated hole 115a (the side away from the support shaft 108).

As shown in FIGS. 35 to 37, the insertion portion 118 (screw shaft of the bolt 118a) of the bracket 110 is inserted into the guide hole 131a. The insertion portion 118 changes its position in the guide hole 131a as the movable member 131 rotates around the support shaft 108. Specifically, when the movable member 131 rotates around the support shaft 108, the insertion portion 118 attached to the bracket 110 does not move, but the guide hole 131a moves together with the movable member 131, so that the insertion portion is inserted in the guide hole 131a. The position of 118 changes. The guide hole 131a and the insertion portion 118 constitute a regulation mechanism that regulates the movement direction and movement range of the movable member 131 with respect to the bracket 110, and the regulation mechanism constitutes a part of the rotation operation mechanism 130.

The operation unit 132 is operated to rotate the movable member 131 together with the support shaft 108. In other words, by operating the operation unit 132, the movable member 131 rotates together with the support shaft 108. As shown in FIGS. 34, 35, and 37, the operation unit 132 is provided on the other end side (opposite side of the tension pulley 106 side) of the support shaft 108. As shown in FIGS. 35 to 37, the operation unit 132 includes a first fixing member 133, a second fixing member 134, and an adjusting mechanism 135.

The first fixing member 133 is fixed to the movable member 131. The first fixing member 133 is provided between the support shaft 108 and the guide hole 131a (above the support shaft 108 and below the guide hole 131a). In the case of the present embodiment, the first fixing member 133 is composed of a bolt 133a and a nut 133b. The head of the bolt 133a is arranged on the other side (left side) of the movable member 131, and the screw shaft penetrates the movable member 131. The nut 133b is screwed to the screw shaft of the bolt 133a on one side (right side) of the movable member 131. The nut 133b is arranged in the elongated hole 115a of the third auxiliary member 115, and can move along the elongated hole 115a as the movable member 131 rotates. As shown in FIG. 36, the first fixing member 133 has a through hole 133c. The through hole 133c is provided in the head of the bolt 133a.

The second fixing member 134 is fixed to the bracket 110. Specifically, the second fixing member 134 is fixed to the third auxiliary member 115 of the bracket 110. In the case of the present embodiment, the second fixing member 134 is composed of a bolt 134a and a nut 134b. The head of the bolt 134a is arranged on the other side (left side) of the third auxiliary member 115 of the bracket 110, and the screw shaft penetrates the third auxiliary member 115. The nut 134b is screwed to the screw shaft of the bolt 134a on one side (right side) of the third auxiliary member 115. As shown in FIG. 36, the second fixing member 134 has a through hole 134c. The through hole 134c is provided in the head of the bolt 134a.

The adjusting mechanism 135 is a mechanism capable of adjusting the distance between the first fixing member 133 and the second fixing member 134. As shown in FIGS. 36 and 37, the adjusting mechanism 135 includes a male screw member 135a, a female screw member (nut) 135b, and a lock member 135c.
One end side (front side) of the male screw member 135a is fixed to the first fixing member 133, and the other end side (rear side) is inserted into the second fixing member 134. Specifically, one end side of the male screw member 135a is inserted and fixed in the through hole 133c of the first fixing member 133. The other end side of the male screw member 135a is inserted into the through hole 134c of the second fixing member 134, and can move in the through hole 134c. The female screw member (nut) 135b is in contact with the second fixing member 134 and screwed into the male screw member 135a on the other end side of the male screw member 135a. As a result, when the male screw member 135a is rotated, the male screw member 135a moves forward or backward along the hole axis direction of the through hole 134c.

The lock member 135c is a nut screwed into the male screw member 135a, and functions as a lock nut for preventing the female screw member 135b from loosening. The lock member 135c is in contact with the female screw member 135b and screwed into the male screw member 135a on the other end side (rear side) of the female screw member 135b. That is, the female screw member 135b is sandwiched between the lock member 135c and the second fixing member 134. By tightening the lock member 135c toward the female screw member 135b, the female screw member 135b can be fixed (rotation is locked).

Hereinafter, the operation (operation) of the belt tension adjusting device 100 will be described mainly based on FIGS. 37 to 39.
First, the operation when the tension of the second belt 107 is increased (the second belt 107 is stretched) will be described. In FIGS. 37 and 38, the state before the operation is shown by a solid line, and the state after the operation is shown by a virtual line. When increasing the tension of the second belt 107, the female screw member 135b of the operation unit 132 is rotated in the forward direction (direction of arrow A). This positive direction is the direction in which the female screw member 135b is tightened. When the female screw member 135b is rotated in the positive direction, the male screw member 135a moves in one direction (arrow B direction). When the male screw member 135a moves in one direction (rearward), the first fixing member 133 fixed to the movable member 131 is pulled by the male screw member 135a, and the movable member 131 rotates in the forward direction (arrow C direction) together with the support shaft 108. To do. When the support shaft 108 rotates in the positive direction, the second portion 122 of the rotating member 120 rotates in the forward direction (arrow D direction) about the support shaft 108. Along with the rotation of the second portion 122, the tension pulley 106 rotates in the forward direction (arrow E direction) about the support shaft 108. As a result, the tension of the second belt 107 increases (the second belt 107 is stretched).

Next, the operation when the tension of the second belt 107 is reduced (the second belt 107 is loosened) will be described. In FIGS. 37 and 38, the state before the operation is shown by a virtual line, and the state after the operation is shown by a solid line. When reducing the tension of the second belt 107, the female screw member 135b of the operating portion 132 is rotated in the opposite direction (the direction opposite to the arrow A). This reverse direction is the direction in which the female screw member 135b is loosened. When the female screw member 135b is rotated in the opposite direction, the male screw member 135a moves in the other direction (the direction opposite to the arrow B). When the male screw member 135a moves in the other direction (forward), the first fixing member 133 fixed to the movable member 131 is pushed by the male screw member 135a, and the movable member 131 moves in the opposite direction (opposite direction to the arrow C direction) together with the support shaft 108. ). When the support shaft 108 rotates in the opposite direction, the second portion 122 of the rotating member 120 rotates in the opposite direction (opposite direction to the arrow D) about the support shaft 108. Along with the rotation of the second portion 122, the tension pulley 106 rotates about the support shaft 108 in the opposite direction (direction opposite to the arrow E). As a result, the tension of the second belt 107 is reduced (the second belt 107 is loosened).

As described above, when the female screw member 135b is rotated in the tightening direction, the second belt 107 is stretched, and when the female screw member 135b is rotated in the loosening direction, the second belt 107 is loosened. Therefore, the operation (tightening or loosening of the female screw member) and the result based on the operation (tensioning or loosening of the belt) tend to match the sense of the operator.
According to the belt tension adjusting device 100 of the above embodiment, the tension pulley 106 can be moved to adjust the tension of the second belt 107. Therefore, the tension of the second belt 107 can be adjusted without moving the compressor (driven device) 25.

In the above-described embodiment, the belt tension adjusting device 100 is a device for adjusting the tension of the second belt 107, but may be a device for adjusting the tension of the first belt 104. In this case, a driven pulley 105 is provided on the alternator 24, the first belt 104 is wound around the driven pulley 105, the drive pulley 101, and the tension pulley 106, and the tension pulley 106 can be moved by the belt tension adjusting device 100. Can be adopted.

Further, the belt tension adjusting device 100 is also applicable to a belt that transmits the power of the prime mover 13 to a driven device (for example, a hydraulic pump or the like) other than the compressor 25 and the alternator 24. That is, the belt tension adjusting device 100 can be widely applied to a belt wound around a pulley of a driven device that receives and drives the power of the prime mover 13 by belt transmission.

According to the working machine 1 of the above-described embodiment, the following effects are obtained.
The work machine 1 has first support portions 61A and 61B arranged along the inner surface of the first horizontal plate 8c and in contact with the first horizontal plate 8c, and first horizontal plates 8c in the first support portions 61A and 61B. A reinforcing plate 60 having first bent portions 63A and 63B that bends toward the second horizontal plate 8d side from a position overlapping with the first pivot member 27 is provided.

According to this configuration, the first bent portions 63A and 63B, which are portions having high strength, are close to the inner surface of the first horizontal plate 8c at a position where they overlap with the first pivot member 27 via the first horizontal plate 8c. As a result, the boom 8 can be firmly reinforced, so that the deformation of the first pivot member 27 (specifically, the left plate 27L and the right plate 27R) due to the load (thrust) acting from the first hydraulic cylinder 20 Deformation that widens or narrows) can be suppressed. As a result, the stress concentration generated at the end of the first pivot member 27 due to the deformation of the first pivot member 27 due to the thrust of the first hydraulic cylinder 20 can be relaxed. Further, since the boom 8 is firmly reinforced by the reinforcing plate 60, the stress concentration generated at the end of the first pivot member 27 due to the external force acting on the work device 5 including the boom 8 and the arm 9 is alleviated. can do.

Further, the first bent portion 63A of the first lateral plate 8c overlaps the position between the end of the first pivot member 27 in the boom length direction and the pivot portion 271 via the first horizontal plate 8c. Close to the inner surface, the first support portions 61A and 61B extend from the first bent portions 63A and 63B along the inner surface of the first horizontal plate 8c in a direction away from the pivot portion 271.
According to this configuration, the first horizontal plate 8c, which is a position where stress concentration is likely to occur, is located at a position overlapping between the end of the first pivot member 27 in the boom length direction and the pivot portion 271. Since the bent portions 63A and 63B are close to each other, the stress concentration generated at the end portion of the first pivot member 27 can be effectively relaxed. Further, the first support portion 61A extends from the first bending portions 63A and 63B on the side where stress concentration is likely to occur toward the direction away from the pivot portion 271 along the inner surface of the first horizontal plate 8c. Therefore, the stress concentration generated at the end of the first pivot member 27 can be more effectively relaxed.

Further, the reinforcing plate 60 is arranged along the inner surface of the second horizontal plate 8d, and the second support portions 62A and 62B and the second support portions 62A and 62B to the first horizontal plate are in contact with the second horizontal plate 8d. It has second bent portions 64A and 64B that bend toward the 8c side, and connecting portions 65A and 65B that connect the first bent portions 63A and 63B and the second bent portions 64A and 64B.
According to this configuration, the strength of the reinforcing plate 60 can be increased by the second bent portions 64A and 64B. Further, the boom 8 can be reinforced more effectively by reinforcing the first horizontal plate 8c and the second horizontal plate 8d by the reinforcing plate 60.

A second hydraulic cylinder 21 different from the first hydraulic cylinder 20, and a second pivot portion 281 fixed to the outer surface of the second horizontal plate 8c and pivotally supporting one end of the second hydraulic cylinder 21. The member 28 is provided, and the second bent portion 64A is close to the inner surface of the second horizontal plate 8d at a position where it overlaps with the second pivot member 28.
According to this configuration, the second bent portion 64A, which is a portion having high strength, approaches the inner surface of the second horizontal plate 8d at a position where it overlaps with the second pivot member 28 via the second horizontal plate 8d. As a result, the second horizontal plate 8d can be firmly reinforced, so that the deformation of the second pivot member 28 due to the load (thrust) acting from the second hydraulic cylinder 21 (specifically, the left plate 28L and the right plate). Deformation that widens or narrows between 28R) can be suppressed. As a result, the stress concentration generated at the end of the second pivot member 28 due to the deformation of the second pivot member 28 due to the thrust of the second hydraulic cylinder 21 can be relaxed. Further, by firmly reinforcing the second horizontal plate 8d, the stress concentration generated at the end of the second pivot member 28 due to the external force acting on the working device 5 including the boom 8 and the arm 9 is also alleviated. be able to.

Further, the second support portion 62A extends from the second bent portion 64A along the inner surface of the second horizontal plate 8d in a direction away from the second pivot plate 281.
According to this configuration, the second support portion 62A is directed away from the second pivot plate 281 along the inner surface of the second horizontal plate 8d from the second bending portion 64A, which is the side on which stress concentration is likely to occur. Since it is extended, the stress concentration generated at the end of the second pivot member 28 can be effectively relaxed.

Further, the reinforcing plate 60 is overlapped with the front portion of the first pivot member 27 in the boom length direction via the first horizontal plate 8c, and the boom in the first pivot member 27 via the first horizontal plate 8c. It is provided at a position that overlaps with the rear part in the length direction.
According to this configuration, both the position of the first horizontal plate 8c overlapping the front portion of the first pivot member 27 and the position overlapping the rear portion of the first pivot member 27 can be reinforced by the reinforcing plate 60. , The stress concentration generated at the end of the first pivot member 27 can be relaxed more effectively.

The work machine 1 includes a body 2, a boom 8 having a pivot end side pivotally supported by the body 2 and a pivot branch (front pivot) 83 on the tip side, and a pivot shaft (second horizontal axis) 32 on the shaft support 83. A shaft support portion 83 includes a first bearing portion 85 that supports one end side of the pivot support shaft 32 and a second bearing that supports the other end side of the pivot support shaft 32. A connecting portion that connects the portion 86, the first bearing portion 85, and the second bearing portion 86, and has a first concave portion 88 formed on at least one surface of the upper surface 87a and the lower surface 87b so as to be recessed toward the other surface side. Has 87 and.

According to this configuration, it is not necessary to displace the connecting portion 97 on the upper surface 87a side or the lower surface 87b side of the boom 8 in order to secure a space for guiding the hydraulic hose, so that the connecting portion 87 is arranged on the boom 8 side. It can be provided near the middle of the vertical direction. Therefore, when a torsional force in the turning direction of the machine body 2 acts on the tip portion (front shaft support portion 83) of the boom 8, the stress concentration generated at the roots of the first bearing portion 85 and the second bearing portion 86 is relaxed, and the torsional force is relaxed. Sufficient strength of the tip of the boom 8 can be secured. Further, by ensuring the strength, the wall thickness of the tip portion (front shaft branch portion 83) can be reduced, and the weight of the boom 8 can be reduced.

Further, a hydraulic hose extending from the base end side to the tip end side of the boom 8 is provided, and a holding portion 30 for holding the hydraulic hose is provided in the first recess 88.
According to this configuration, by providing the holding portion 30 of the hydraulic hose in the first recess 88, the connecting portion 87 can be provided near the middle of the boom 8 in the vertical direction even when the holding portion 30 is provided. As a result, the stress concentration generated at the roots of the first bearing portion 85 and the second bearing portion 86 can be appropriately relaxed.

Further, the boom 8 has a boom main body 81 and a pivotal branch (front pivotal branch) 83 attached to the tip of the boom main body 81, and the front end 87e of the connecting portion 87 is the upper end and the shaft of the pivot shaft 32. Located below the first straight line L1 connecting the vertical midpoint M of the rear end of the branch 83 and above the second straight line L2 connecting the lower end of the pivot shaft 32 with the midpoint M. There is.
According to this configuration, since the front end 87e of the connecting portion 87 is located substantially at the center of the shaft support portion 83 in the vertical direction, the first bearing portion when a torsional force acts on the tip portion (front pivot portion) of the boom 8. It is possible to prevent stress concentration from occurring at the roots of the 85 and the second bearing portion 86.

Further, the one surface of the connecting portion 87 is formed on an inclined surface inclined with respect to the extending direction of the boom, and the first recess 88 is provided on the inclined surface.
According to this configuration, since the first recess 88 is provided on the inclined surface, it is possible to surely secure a space for guiding the hydraulic hose above or below the connecting portion 87.
Further, the other surface of the connecting portion 87 is formed as an inclined surface inclined with respect to the extending direction of the boom.

According to this configuration, since the upper surface and the lower surface of the connecting portion 87 are inclined surfaces, the connecting portion 87 has a shape close to symmetry in the vertical direction. Therefore, the first bearing portion 85 and the second bearing portion 86 It is possible to effectively prevent the occurrence of stress concentration that occurs at the root of the bearing.
Further, on the other surface of the connecting portion 87, a second recess 89 recessed toward the one surface side is formed.

According to this configuration, by forming recesses on the upper surface and the lower surface of the connecting portion 87, the connecting portion 87 has a shape closer to symmetry in the vertical direction. Therefore, the occurrence of stress concentration can be effectively prevented.
Further, the rear end portion 87c of the inclined surface formed on the one surface of the connecting portion 87 is located behind the rear end portion 87d of the inclined surface formed on the other surface of the connecting portion 87. ..

According to this configuration, the inclination angle of one surface (upper surface 87a) of the connecting portion 87 is gentler than the inclination angle of the other surface (lower surface 87b), so that the hydraulic hose is gently inclined along the upper surface 87a. It is possible to guide smoothly while letting it.
The support member 150 of the work machine 1 has a first support member 151 that supports a fulcrum shaft 163 that serves as an opening / closing fulcrum of the cover 41, and a second support that is attached to the first support member 151 and has an attachment portion 152d of a switching valve 170. At least one of the first support member 151 and the second support member 152, including the member 152, has a position adjusting portion 153 that can adjust the relative positions of the first support member 151 and the second support member 152. There is.

According to this configuration, the relative positions of the first support member 151 and the second support member 152 can be adjusted by the position adjusting unit 153, so that the fulcrum shafts 163 and the first of the cover 41 supported by the first support member 151 can be adjusted. 2 The relative position of the switching valve 170 attached to the support member 152 can be adjusted. As a result, it is possible to easily prevent the cover 41 from interfering with the hydraulic hose or the like connected to the switching valve 170.

More specifically, the cover 41 adjusts the mounting position (position of the fulcrum shaft 162) in order to avoid interference with the hydraulic hoses (fourth hydraulic hose 176, fifth hydraulic hose 177, etc.) and other members. You may have to. When the fulcrum shaft 163 and the switching valve 170 are attached to the same member (one member), if the fulcrum shaft 163 is moved to adjust the position of the cover 41, the switching valve 170 also moves at the same time. .. That is, the relative positions of the fulcrum shaft 163 and the switching valve 170 cannot be changed. Therefore, when the cover 41 and the hydraulic hose connected to the switching valve 170 interfere with each other, there is a problem that the interference cannot be eliminated even if the position of the cover 41 is adjusted.

In the case of the present embodiment, the fulcrum shaft 163 and the switching valve 170 are attached to separate members (first support member 151 and second support member 152), and the position of the second support member 152 with respect to the first support member 151. Is adjustable. Therefore, the relative positions of the fulcrum shaft 163 and the switching valve 170 can be changed, and the above-mentioned inconvenience does not occur.
Further, a connecting member 178 for connecting the first support member 151 and the second support member 152 is provided, a first hole 151c is formed in the first support member 151, and a second hole 152c is formed in the second support member 152. The connecting member 178 is formed and has an insertion portion 178a to be inserted into the first hole 151c and the second hole 152c, and the position adjusting portion 153 is a hole of at least one of the first hole 151c and the second hole 152c. The hole is formed to have a play gap with respect to the outer diameter of the insertion portion 178a.

According to this configuration, the relative positions of the first support member 151 and the second support member 152 can be adjusted by using the play gap while connecting the first support member 151 and the second support member 152 by the connecting member 178. Can be.
Further, the first support member 151 has a first plate portion 151b provided with a first hole 151c, and the second support member 152 is provided with a second hole 152c and above or below the first plate portion 151b. The second plate portion 152a is overlapped with the first plate portion 152a, and the play gap allows the rotational movement of the second plate portion 152a with respect to the first plate portion 151b.

According to this configuration, the rotational movement of the second plate portion 152a with respect to the first plate portion 151b is allowed, so that the plan view position of the switching valve 170 with respect to the fulcrum shaft 163 can be easily adjusted by the rotational movement.
Further, it includes a foundation member 159 fixed to the machine body 2 and to which the first support member 151 is attached, and a second position adjusting unit 154 that can adjust the position of the first support member 151 with respect to the foundation member 159. ..

According to this configuration, the position of the first support member 151 with respect to the machine body 2 can be adjusted by the second position adjusting unit 154. As a result, in addition to adjusting the position of the second support member 152 with respect to the first support member 151, the position of the first support member 151 with respect to the machine body 2 can be adjusted. That is, the position of the switching valve 170 connected to the control valve 26 and the position of the fulcrum shaft 163 that serves as the opening / closing fulcrum of the cover 41 can be adjusted independently.

Further, the support member 150 is arranged on one side in the width direction of the machine body 2, the cover 41 covers the upper side of the support member 150 and one side in the machine body width direction, and the play gap is the second with respect to the first support member 151. Allows the support member 152 to move in the width direction of the machine body.
According to this configuration, the second support member 152 can be moved toward the inside of the machine with respect to the first support member 151. Therefore, the switching valve 170 can be moved toward the inside of the machine with respect to the support shaft 163 to avoid interference between the hydraulic hose or the like connected to the switching valve 170 and the cover 41.

Further, a hydraulic oil tank 15 for accommodating hydraulic oil and a control valve 26 for controlling the supply of hydraulic oil to the hydraulic equipment are provided, and the switching valve 170 includes an inlet port 171 connected to the hydraulic equipment and a control valve 26. Either the first outlet port 172 to be connected, the second outlet port 173 to be connected to the hydraulic oil tank 15, or the destination of the hydraulic oil introduced from the inlet port 171 is either the first outlet port 172 or the second outlet port 173. It has an operation handle 174 that can be switched to either one.

According to this configuration, when the switching valve 170 is a so-called third line valve that enables the hydraulic oil to be returned to the hydraulic oil tank 15 by the switching operation without going through the control valve 26, it is connected to the third line valve. It is possible to avoid interference between the hydraulic hose and the cover 41.
The work machine 1 is engaged with the machine body 2, a bonnet 43 provided to be openable and closable with respect to the machine body 2, a locking piece 80 provided on the bonnet 43, and when the machine body 2 is provided and the bonnet 43 is closed. The receiving member 90 includes a receiving member 90 having a locking portion 922 to which the stop piece 80 is locked, and the receiving member 90 has a first receiving member 91 fixed to the machine body 2 and a locking portion 922. At least one of the first receiving member 91 and the second receiving member 92, including the second receiving member 92 connected to the receiving member 91, can adjust the relative positions of the first receiving member 91 and the second receiving member 92. It has an adjusting unit 93.

According to this configuration, the position of the locking portion 922 with respect to the machine body 2 can be adjusted by adjusting the relative positions of the first receiving member 91 and the second receiving member 92. As a result, the position of the locking portion 922 with respect to the locking piece 80 provided on the bonnet 43 can be adjusted, and the engagement margin of the locking piece 80 with respect to the locking portion 922 can be adjusted. Therefore, the locking piece 80 provided on the bonnet 43 can be reliably locked to the locking portion 922 of the receiving member 90 provided on the machine body 2. As a result, it is necessary to prevent defects caused by dimensional errors and assembly errors of the bonnet 43, the receiving member 90, etc. (defects such as the bonnet 43 cannot be closed on the production line and the bonnet 43 opens due to vibration during use). Can be done.

Further, a connecting member 94 for connecting the first receiving member 91 and the second receiving member 92 is provided, a first hole 91a is formed in the first receiving member 91, and a second hole 92a is formed in the second receiving member 92. The connecting member 94 has an insertion portion 94d to be inserted into the first hole 91a and the second hole 92a, and the adjusting portion 93 includes at least one of the first hole 91a and the second hole 92a. The hole is formed to have a play gap CL3 with respect to the outer diameter of the insertion portion 94d.

According to this configuration, while connecting the first receiving member 91 and the second receiving member 92 by the connecting member 94, the relative positions of the first receiving member 91 and the second receiving member 92 are adjusted by using the play gap CL3. It can be possible.
Further, the play gap CL3 allows the second receiving member 92 to move with respect to the first receiving member 91 in the vertical direction and the front-back direction.

According to this configuration, the degree of freedom in adjusting the position of the locking portion 922 with respect to the locking piece 80 is increased. Therefore, inconveniences caused by dimensional errors and assembly errors of the bonnet 43, the receiving member 90, and the like can be more reliably prevented.
Further, at least one of the first receiving member 91 and the machine body 2 has a second adjusting portion capable of adjusting the relative positions of the first receiving member 91 and the machine body 2.

According to this configuration, in addition to adjusting the relative positions of the first receiving member 91 and the second receiving member 92, it is possible to adjust the relative positions of the machine body 2 and the first receiving member 91. Therefore, the position of the locking portion 922 with respect to the locking piece 80 can be adjusted in the vertical direction, the front-rear direction, and the left-right direction.
Further, the second receiving member 92 has a slit 923 cut from the bonnet 43 side toward the machine body 2, and is arranged in the bonnet 43 so that one side faces upward and the other side faces downward. At the same time, an insertion plate 95 that is inserted into the slit 923 when the bonnet 43 is closed is provided.

According to this configuration, the vibration of the bonnet 43 can be suppressed by restricting the movement of the insertion plate 95 by the slit 923 while the bonnet 43 is closed. Further, when the bonnet 43 is closed, the insertion plate 95 provided in the bonnet 43 is inserted into the slit 923 of the second receiving member 92, so that the bonnet 43 is accurately positioned with respect to the receiving member 90. Therefore, the locking piece 80 can be reliably locked to the locking portion 922. Further, the insertion plate 95 arranged so that one surface faces upward and the other surface faces downward is configured to be inserted into the slit 923, so that the second receiving member 92 and the insertion plate 95 are compact in the vertical direction. It is possible to prevent the structure from interfering with other members.

Further, the adjusting portion 93 has an upper adjusting portion 93A provided on the upper portion of the first receiving member 91 and a lower adjusting portion 93B provided on the lower portion of the first receiving member 91, and has a locking portion 922. The slit 923 and the slit 923 are provided between the upper adjusting portion 93A and the lower adjusting portion 93B.
According to this configuration, the position of the second receiving member 92 with respect to the first receiving member 91 can be surely adjusted with high accuracy by the two adjusting parts of the upper adjusting part 93A and the lower adjusting part 93B. Further, since the locking portion 922 and the slit 923 are provided between the two adjusting portions, the position of the locking portion 922 can be accurately adjusted.

Further, the locking portion 922 has a recess 924 cut out from the bonnet 43 side toward the machine body 2, and a columnar locking shaft 925 extending in the vertical direction on the bonnet 43 side of the recess 924. The locking piece 80 is composed of a hook that is locked to the locking shaft 925.
According to this configuration, by inserting the hook constituting the locking piece 80 into the space formed between the recess 924 and the locking shaft 925, the locking piece 80 is reliably attached to the locking shaft 925. And it can be easily locked. Further, since the locking shaft 925 is cylindrical, even if the locking piece 80 is repeatedly locked and released from the locking shaft 925, the locking shaft 915 is less likely to be worn and is reliable for a long period of time. It can be locked.

Further, a vertical axis 79 that rotatably supports the locking piece 80 is provided, the second receiving member 92 extends from the machine body 2 side toward the bonnet 43 side, and the locking shaft 925 and the vertical axis 79 When the bonnet 43 is closed, the second receiving member 92 is arranged side by side in a direction parallel to the extending direction (front-rear direction).
According to this configuration, the locking piece 80 can be locked to the locking shaft 925 so as to be easily caught and hard to be disengaged. Specifically, in FIG. 28, when the vertical axis 79 is displaced to the right (above the alternate long and short dash line L) with respect to the locking shaft 925, the locking piece 80 is easily caught by the locking shaft 925 but easily disengaged. .. When the vertical axis 79 is displaced to the left (below the alternate long and short dash line L) with respect to the locking shaft 925, the locking piece 80 is difficult to disengage from the locking shaft 925 but is difficult to be caught. According to the present embodiment, by arranging the locking shaft 925 and the vertical axis 79 in an appropriate positional relationship, the locking is easy to be caught and hard to come off.

The belt tension adjusting device 100 includes a drive pulley 101 attached to a power transmission shaft (output shaft 13a), a driven pulley 105 provided in a driven device (compressor 25), a tension pulley 106, and a driven pulley 101. An endless belt (second belt) 107 that is hung over the pulley 105 and the tension pulley 106 and transmits the rotational driving force of the power transmission shaft to the driven device, and tension adjustment that adjusts the tension of the belt. The tension adjusting mechanism includes a mechanism, and the tension adjusting mechanism connects the support shaft 108 rotatably supported, the rotation operation mechanism 130 that rotates the support shaft 108 around the axis, and the support shaft 108 and the tension pulley 106. It includes a drive pulley 101 of the tension pulley 106 and a rotating member 120 that changes the relative position of the tension pulley 106 with respect to the driven pulley 105 as the support shaft 108 rotates.

According to this configuration, the tension of the belt (second belt) 107 can be adjusted without moving the driven device (compressor 25). Therefore, when the tension of the belt is adjusted, it is possible to prevent the wiring or the like connected to the driven device from moving and interfering with other members. In addition, it is not necessary to secure a space for moving the driven device. Further, since it is not necessary to move the device 25, the tension of the second belt 107 can be adjusted with a small force. Further, since the force (twisting force) generated when the rotating member 120 is rotated can be received by the rotation of the support shaft 108, deformation or breakage due to the twisting force is unlikely to occur.

Further, the rotation operation mechanism 130 regulates the rotation range of the movable member 131 attached to the support shaft 108, the operation unit 132 that rotates the support shaft 108 by rotating the movable member 131, and the movable member 132. It has a regulatory mechanism.
According to this configuration, since the support shaft 108 can be rotated by rotating the movable member 131 by the operation unit 132, the operation for adjusting the tension of the second belt 107 is easy. Further, since the rotation range of the movable member 132 is regulated by the regulation mechanism, the tension of the second belt 107 can be adjusted within an appropriate range.

Further, a bracket 110 having a fixing portion 116 fixed to the driven device and a support portion 117 for rotatably supporting the support shaft 108 is provided, and the regulation mechanism uses the support shaft 108 formed on the movable member 131. It has an arc-shaped guide hole 131a as a center, and an insertion portion 118 provided in the bracket 110 that is inserted into the guide hole 131a and changes its position in the guide hole 131a as the movable member 131 rotates. are doing.

According to this configuration, the guide hole 131a and the insertion portion 118 can accurately and surely regulate the movement direction and movement range of the movable member 131 with respect to the bracket 110. As a result, the movable member 131 can be smoothly and accurately rotated with the rotation of the support shaft 108.
Further, the support shaft 108 is parallel to the rotation axis of the tension pulley 106, one end side is arranged on the tension pulley 106 side, the other end side is arranged on the opposite side to the tension pulley 106 side, and the operation unit 132 is the support shaft. It is provided on the other end side of 108.

According to this configuration, since the operation unit 132 is arranged on the other end side of the support shaft 108 (the side opposite to the tension pulley 106 side), other equipment (radiator 46 or the like) arranged on the tension pulley 106 side can be used. It does not interfere with the operation of the operation unit 132, and the operability of the operation unit 132 is excellent.
Further, the operation unit 132 is a distance between the first fixing member 133 fixed to the movable member 131, the second fixing member 134 fixed to the bracket 110, and the first fixing member 133 and the second fixing member 134. It has an adjustable mechanism 135 and.

According to this configuration, the adjustment mechanism 135 adjusts the distance between the first fixing member 133 and the second fixing member 134, whereby the portion of the movable member 131 fixed to the first fixing member 133 and the bracket 110. The distance from the portion where the second fixing member 134 is fixed can be changed. As a result, the linear motion (adjustment of the distance between the first fixing member 133 and the second fixing member 134) by the adjusting mechanism 135 can be converted into a rotational motion of the movable member 131 with respect to the bracket 110.

Further, in the adjusting mechanism 135, one end side is fixed to the first fixing member 133 and the other end side is inserted into the second fixing member 134, and the other end side is in contact with the second fixing member 134 and the male screw member 134. It has a female screw member 135b screwed into 135a.
According to this configuration, the male screw member 135a can be moved forward and backward with respect to the female screw member 135b by rotating the female screw member 135b. Thereby, the distance between the first fixing member 133 and the second fixing member 134 can be easily adjusted. That is, the movable member 131 can be rotated with respect to the bracket 110 by a simple operation of rotating the female screw member 135b.

Although the present invention has been described above, it should be considered that the embodiments disclosed this time are exemplary in all respects and are not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and it is intended that all modifications within the meaning and scope equivalent to the scope of claims are included.

1 Work machine 2 Machine 43 Bonnet 79 Vertical axis 80 Locking piece 90 Receiving member 91 1st receiving member 91a 1st hole 92 2nd receiving member 92a 2nd hole 922 Locking part 923 Slit 924 Recession 925 Locking shaft 93 Adjusting part 93A Upper adjustment part 93B Lower adjustment part 94 Connection member 94d Insert part 95 Insert plate CL3 Play gap

Claims (6)

With the aircraft
A bonnet that can be opened and closed with respect to the aircraft
The locking piece provided on the bonnet and
A receiving member provided on the airframe and having a locking portion on which the locking piece is locked when the bonnet is closed.
With
The receiving member includes a first receiving member fixed to the machine body and a second receiving member having the locking portion and connected to the first receiving member.
At least one of the first receiving member and the second receiving member has an adjusting portion capable of adjusting the relative positions of the first receiving member and the second receiving member .
The second receiving member has a slit cut from the bonnet side toward the machine body side.
A working machine provided with an insertion plate inserted into the slit when the bonnet is closed, and the bonnet is arranged so that one surface faces upward and the other surface faces downward . With the aircraft
A bonnet that can be opened and closed with respect to the aircraft
The locking piece provided on the bonnet and
A receiving member provided on the airframe and having a locking portion on which the locking piece is locked when the bonnet is closed.
A vertical axis that rotatably supports the locking piece, and
With
The receiving member includes a first receiving member fixed to the machine body and a second receiving member having the locking portion and connected to the first receiving member.
At least one of the first receiving member and the second receiving member has an adjusting portion capable of adjusting the relative positions of the first receiving member and the second receiving member .
The locking portion has a recess cut out from the bonnet side toward the machine body side, and a columnar locking shaft extending in the vertical direction on the bonnet side of the recess.
The locking piece is composed of a hook that is locked to the locking shaft.
The second receiving member extends from the machine body side toward the bonnet side.
A working machine in which the vertical axis and the locking axis are arranged side by side in a direction parallel to the extending direction of the second receiving member when the bonnet is closed . A connecting member for connecting the first receiving member and the second receiving member is provided.
A first hole is formed in the first receiving member.
A second hole is formed in the second receiving member.
The connecting member has an insertion portion to be inserted into the first hole and the second hole.
The adjusting portion includes at least one of the first hole and the second hole, and the hole is formed to have a play gap with respect to the outer diameter of the insertion portion. Or the working machine according to 2 . The working machine according to claim 3 , wherein the play gap allows movement of the second receiving member with respect to the first receiving member in the vertical direction and the front-back direction. The first item according to any one of claims 1 to 4 , wherein at least one of the first receiving member and the airframe has a second adjusting part capable of adjusting the relative position between the first receiving member and the airframe. Working machine. The one according to any one of claims 1 to 5, wherein the adjusting portion includes an upper adjusting portion provided above the locking portion and a lower adjusting portion provided below the locking portion. Working machine.

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