JP6906226B2 - Work machine - Google Patents

Description

The present invention relates to a working machine. In particular, the present invention relates to a working machine having a mechanism for assisting the power to flip up the cover member.

Currently, in order to reduce the working hours of agricultural work, automatic work machines are being promoted, and various work machines are being developed. In particular, a work machine (cultivator or puddling machine) that is attached to the rear of a tractor or other traveling machine and can be replaced according to the type of work, such as tilling or puddling, is like an attachment to a tractor or other running machine. It is possible to handle various farm work just by exchanging it, which greatly contributes to the cost reduction of farm work.

Working machines such as cultivators and puddlers have a working rotor that cultivates or agitates the soil by rotating the working claws. A work machine with a work rotor has a cover that covers the top and back of the work rotor to prevent scattered objects such as soil, grass, and pebbles that are flipped up by the work claws from splashing outside the work machine. Has a member. In the case of a cultivator, members such as a shield cover and an apron are used as cover members.

In this way, in a work machine equipped with a cover member that suppresses the scattering of scattered matter during work, the work of scraping off the scattered matter adhering to the work rotor and cover member, and the work of replacing the deteriorated or failed work rotor and work claws May be done. At the time of this work, it is necessary to hold the cover member in a state of being flipped up and perform the work.

However, since the cover member mounted on the work machine is very heavy, the work of flipping up the cover member imposes a heavy burden on the operator. Furthermore, if the cover is dropped during the flip-up operation, there is a risk of injury to the operator or damage to the equipment. Therefore, for example, as shown in Patent Document 1, a working machine having an assist mechanism for assisting the power to flip up the cover member has been developed.

Japanese Unexamined Patent Publication No. 2016-73205

In a working machine as shown in Patent Document 1, a lock member is provided to regulate the rotation of the arm member that connects the gas spring, which is the power source for flipping up the cover member, and the cover member. A locking portion is provided separately from the arm member and the locking member in order to regulate the operation of the arm member and the locking member. As described above, in the conventional working machine, many members are required to realize the assist mechanism, so that the assist mechanism is complicated. Due to the complexity of the assist mechanism, the cost for manufacturing the assist mechanism has increased, and the miniaturization of the assist mechanism has been hindered.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a working machine having an assist mechanism having a simple structure.

The working machine (working machine 10) according to the embodiment of the present invention includes a first cover member (shield cover 120), a second cover member (apron 130) rotatably connected to the first cover member, and a second cover member (apron 130). An assist member (assist member 210) that assists the power to flip up the second cover member and a first locking portion (first locking portion 2211) are provided, and the second cover member and the assist member rotate respectively. A lock member (lock member 230) including a link member (link member 220) that is possibly connected, and a second locking portion (second locking portion 2301) and a third locking portion (third locking portion 2303). ), And by locking the first locking portion to the second locking portion, the operation of the assist member is restricted, and the first locking portion becomes the third locking portion. By locking, the operation of the link member accompanying the downward rotation of the second cover member and the locking member in the direction in which the first locking portion and the third locking portion are unlocked. Rotation is restricted.

The first locking portion may be fixed to the link member.

It further has an operating member (operating member 240) that is rotatable with respect to the first cover member, and a first elastic member (first elastic member 250) that connects the lock member and the operating member. By the rotation of the operating member, the first elastic member is in a direction in which the first locking portion and the second locking portion are disengaged from the locking member, or with the first locking portion. A rotational force may be applied in a direction in which the lock with the third locking portion is released.

It further has a second elastic member (second elastic member 260) that connects the first cover member and the operation member, and within the rotation range of the operation member, the operation member is said by the second elastic member. A first state in which the operating member is provided with rotational power in the first direction, and a second state in which the operating member is provided with rotational power in the second direction opposite to the first direction by the second elastic member. May be taken.

The operating member may further have an urging member (a urging member 270) that acts on the operating member in a direction in which the operating member switches from the second state to the first state.

The first direction may be a direction in which the operating member is separated from the urging member, and the second direction may be a direction in which the operating member is pressed against the urging member.

The urging member has a rotational power generation unit (rotational power generation unit 2703) that generates rotational power in the urging member by sliding with the first locking portion, and the first locking portion and the urging member. The urging member may be rotated by sliding with the rotational power generating unit, and the operating member may be switched from the second state to the first state.

The lock member has a sliding portion (sliding portion 2305), and in the second state, the first locking portion slides with the urging member, and the operating member moves from the second state to the above. In the first state after switching to the first state, the first locking portion may slide with the sliding portion.

The sliding portion may be provided between the second locking portion and the third locking portion.

According to the working machine according to the present invention, it is possible to provide a working machine having an assist mechanism having a simple structure.

It is a top view which shows the whole structure of the working machine which concerns on one Embodiment of this invention. It is a side view which shows the whole structure of the working machine in the working state which concerns on one Embodiment of this invention. It is a side view which shows the whole structure of the working machine in the state which the apron which concerns on one Embodiment of this invention is flipped up. It is an enlarged side view which shows the assist mechanism which concerns on one Embodiment of this invention. It is an enlarged rear view which shows the assist mechanism which concerns on one Embodiment of this invention. A side view (A) showing the first link member of the assist mechanism according to the embodiment of the present invention, a side view (B) showing the second link member, and a connection state of the first link member and the second link member are shown. It is a side view (C). It is a side view (A) and the top view (B) which show the lock member of the assist mechanism which concerns on one Embodiment of this invention. It is a side view (A) and the top view (B) which show the operation member of the assist mechanism which concerns on one Embodiment of this invention. It is a side view (A) and the top view (B) which show the urging member of the assist mechanism which concerns on one Embodiment of this invention. It is a side view (A) and the enlarged side view (B) which show the 1st locked state of the lock member in the assist mechanism which concerns on one Embodiment of this invention. It is a side view (A) and the enlarged side view (B) which show the 1st lock release preparation state of the lock member in the assist mechanism which concerns on one Embodiment of this invention. It is a side view (A) and the enlarged side view (B) which show the unlocked state of the lock member in the assist mechanism which concerns on one Embodiment of this invention. It is a side view (A) and the enlarged side view (B) which shows the state which the operation member was switched from the 2nd state to the 1st state by the urging member in the assist mechanism which concerns on one Embodiment of this invention. It is a side view (A) and the enlarged side view (B) which show the 2nd locked state of the lock member in the assist mechanism which concerns on one Embodiment of this invention. It is a side view (A) and the enlarged side view (B) which show the 2nd lock release preparation state of the lock member in the assist mechanism which concerns on one Embodiment of this invention. It is a side view (A) and the enlarged side view (B) which show the unlocked state of the lock member in the assist mechanism which concerns on one Embodiment of this invention. It is a side view (A) and the enlarged side view (B) which shows the state which the operation member was switched from the 2nd state to the 1st state by the urging member in the assist mechanism which concerns on one Embodiment of this invention.

Hereinafter, the working machine according to the present invention will be described with reference to the drawings. However, the working machine of the present invention can be implemented in many different modes, and is not construed as being limited to the description of the embodiments shown below. In the drawings referred to in the present embodiment, the same parts or parts having the same functions are designated by the same reference numerals, and the repeated description thereof will be omitted. Further, for convenience of explanation, the terms "upper" and "lower" will be used, but the upper and lower directions indicate the directions of the working machine in the working state, respectively. Similarly, although the description will be made using the terms front and rear, the front indicates the direction of the traveling machine that pulls the working machine with respect to the working machine, and the rear indicates the direction of the working machine with respect to the traveling machine.

<Embodiment 1>
The overall configuration of the work machine and each functional part of the work machine according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 16. The working machine according to the first embodiment of the present invention is used as a working machine such as a cultivator or a puddling machine, which is connected to the rear part of a traveling machine such as a tractor and cultivates or stirs soil by rotating a working claw. be able to. In the present embodiment, the configuration of the present invention will be described using a tilling work machine as an example of the working machine, but the working machine according to the present invention may be a puddling machine, and the working machine other than the cultivating work machine or the puddling machine. It may be.

[Structure of working machine 10]
The overall configuration of the working machine 10 according to the first embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a top view showing the overall configuration of a working machine according to an embodiment of the present invention. FIG. 2 is a side view showing the overall configuration of the working machine in the working state according to the embodiment of the present invention. For convenience of explanation, the side plate of the shield cover 120 is omitted in FIG. Further, for convenience of explanation, among the lines showing the contours of the members in the back, the lines in the area hidden by the members in the foreground are also drawn with solid lines.

As shown in FIG. 1, the working machine 10 according to the first embodiment has a main frame 110, a shield cover 120, an apron 130, and a ground leveling plate 131. The shield cover 120 is fixed so as not to rotate with respect to the main frame 110. That is, the shield cover 120 operates integrally with the main frame 110. The main frame 110, the shield cover 120, and other members fixed so as not to rotate with respect to the main frame 110 may be collectively referred to as a main body portion. The shield cover 120 may be referred to as a first cover member. The apron 130 may be referred to as a second cover member.

The apron 130 is rotatably connected to the shield cover 120 via a connecting portion 140. In other words, the second cover member is rotatably connected to the first cover member. In other words, the second cover member is rotatably connected to the main body. The connecting portion 140 has a cylindrical portion fixed to one member and a columnar portion penetrating the cylindrical portion and fixed to the other member. Further, as shown in FIG. 2, the working machine 10 has a tilling rotor 102. The shield cover 120 is provided above the tiller rotor 102. The apron 130 is provided behind the tiller rotor 102. In the present embodiment, the configuration in which the apron 130 is rotatably connected to the shield cover 120 is illustrated, but the configuration is not limited to this configuration. For example, the apron 130 may be rotatably connected to a main body other than the shield cover 120 (for example, a main frame 110 or the like).

The main frame 110 is connected to a traveling machine such as a tractor. The main frame 110 has a cylindrical shape and has a power transmission shaft inside. The power transmission shaft obtains rotational power from a traveling machine such as a tractor, and changes the direction of the rotary shaft to the left or right in the traveling direction. The power transmission shaft in the main frame 110 is connected to the chain case 105 on the side of the working machine 10. Power is transmitted to the rotating shaft 104 (see FIG. 2) of the tilling rotor 102 by the chain transmission mechanism in the chain case 105.

The tilling rotor 102 includes a rotating shaft 104 and a large number of tilling claws 106 provided on the rotating shaft 104. Although not shown, the plurality of tillage claws 106 are bent to the right or left with respect to the traveling direction, and the area (width) in which each tillage claw 106 digs up the soil overlaps with the adjacent tillage claw 106. .. In other words, the area on which the tilling claw 106 bent to the right with respect to the traveling direction acts and the tilling claw 106 bent to the left with respect to the traveling direction provided at a position adjacent to the tilling claw 106 act. The area includes the same area. The tilling rotor 102 rotates so as to scoop up the soil from the front to the rear in the traveling direction.

The apron 130 can be lowered and flipped up and rotated around the connection portion 140 fixed to the shield cover 120. The center of gravity of the apron 130 is behind the connection 140. Therefore, the apron 130 tends to descend due to its own weight. A stainless steel leveling plate 131 is welded to the tip of the apron 130. The ground leveling plate 131 is configured to draw a loop from the inside to the outside of the apron 130. The ground preparation plate 131 flattens the field dug up by the tiller rotor 102. Movable extension ground leveling plates 133 are provided at both ends of the ground leveling plate 131. By opening the extension leveling plate 133, it becomes possible to level a wide range together with the ground leveling plate 131.

A compression rod 142 is provided between the pedestal 111 provided on the main frame 110 and the apron 130. The compression rod 142 functions to press the apron 130 and the ground preparation plate 131 against the field with a constant pressure when the apron 130 is in the lowered state. The magnitude of the force acting on the compression rod 142 can be adjusted by an operator's operation. Since soil may adhere to the inside of the apron 130, the inside of the apron 130 is covered with the rubber sheet 135. A rubber sheet 121 is also provided inside the shield cover 120.

The working machine 10 further has an assist mechanism 200 in addition to the above configuration. The assist mechanism 200 is connected to the shield cover 120 and the apron 130, and assists the power of the apron 130 when it is flipped up.

The assist mechanism 200 includes an assist member 210, a link member 220, a lock member 230, and an operation member 240. The assist mechanism 200 is provided on a pedestal 123 fixed to the shield cover 120. The shield cover 120 and the pedestal 123 may be integrally referred to as a first cover member. In this embodiment, a gas spring is used as the assist member 210. The link member 220 connects the assist member 210 and the apron 130, and transmits the power of the assist member 210 to the apron 130. The lock member 230 is provided at a position adjacent to the link member 220, and regulates the operation of the link member 220. Specifically, the link member 220 is locked to the lock member 230 to regulate the operation in which the apron 130 is flipped up by the power of the assist member 210, or the operation in which the flipped up apron 130 is lowered by its own weight. regulate. By acting on the lock member 230 and other members, the operation member 240 switches between a locked state in which the operation of the apron 130 is restricted by the lock member 230 and an unlocked state in which the regulation is released. The detailed configuration and function of the assist mechanism 200 will be described later.

In the present embodiment, the configuration in which the pedestal 123 is fixed to the shield cover 120 is illustrated, but the configuration is not limited to this configuration. For example, the pedestal 123 may be fixed to a main body other than the shield cover 120 (for example, a main frame 110 or the like). Further, in the present embodiment, a configuration in which each member of the assist mechanism 200 is rotatably connected to the pedestal 123 has been illustrated, but the configuration is not limited to this configuration. For example, each member of the assist mechanism 200 can be rotated with respect to a main body portion (main frame 110, shield cover 120, or other member fixed so as not to rotate with respect to the main frame 110) other than the pedestal 123. It may be connected.

FIG. 3 is a side view showing the overall configuration of the working machine in a state where the apron according to the embodiment of the present invention is flipped up. By operating the operating member 240 with respect to the working machine 10 in the state shown in FIG. 2, when the locking member 230 is switched from the locked state to the unlocked state, the link member 220 becomes rotatable. When the apron 130 is lifted in this state, the link member 220 is rotated by the power of the assist member 210 and acts on the apron 130. By this action, the power to flip up the apron 130 is generated. This power reduces the work load of the worker flipping up the apron 130. In the present embodiment, since the gas spring is used as the assist member 210, the gas spring changes from the contracted state to the extended state, so that the power to flip up the apron 130 is generated. As shown in FIG. 3, the apron 130 rotates with respect to the shield cover 120 with the connection portion 140 as the center of rotation.

[Structure of assist mechanism 200]
The configuration of the assist mechanism 200 will be described with reference to FIGS. 4A to 8. FIG. 4A is an enlarged side view showing an assist mechanism according to an embodiment of the present invention. In the following side views, for convenience of explanation, the area hidden by the front member in the outline of the back member is also drawn by a solid line. As shown in FIGS. 4A and 4B, the assist mechanism 200 includes the first elastic member 250, the second elastic member 260, and the second elastic member 260, in addition to the assist member 210, the link member 220, the lock member 230, and the operation member 240. It has an urging member 270. The link member 220 has a first link member 221 and a second link member 223, and a third link member 225. Hereinafter, each configuration of the members included in the assist mechanism 200 will be described, and the connection relationship of each configuration will be described.

FIG. 5A is a side view showing the first link member of the assist mechanism according to the embodiment of the present invention. As shown in FIG. 5A, the first link member 221 is provided with a first locking portion 2211. The first locking portion 2211 has a cylindrical shape and protrudes from the flat plate portion 2219. However, the shape of the first locking portion 2211 is not limited to the above shape. For example, the shape of the first locking portion 2211 may be a polygonal prism shape, a conical shape, or a polygonal pyramid shape. The first locking portion 2211 is fixed to the flat plate portion 2219. In other words, the first locking portion 2211 is fixed to the first link member 221. Further, the first link member 221 is provided with a connecting portion 293 with the assist member 210 and a connecting portion 295 with the pedestal 123. The top plate portion 2213 of the first link member 221 is provided with a through hole 2215 that penetrates the top plate portion 2213.

FIG. 5B is a side view showing a second link member of the assist mechanism according to the embodiment of the present invention. As shown in FIG. 5B, the second link member 223 is provided with a connection portion 295 with the pedestal 123 and a connection portion 297 with the third link member 225. The top plate portion 2231 of the second link member 223 is provided with a through hole 2233 that penetrates the top plate portion 2231.

FIG. 5C is a side view showing a connected state of the first link member and the second link member of the assist mechanism according to the embodiment of the present invention. As shown in FIG. 5C, both the first link member 221 and the second link member 223 are rotatably connected to the pedestal 123 at the connecting portion 295. However, the relative rotation angles of the first link member 221 and the second link member 223 are fixed by the adjusting screw 2220. The adjusting screw 2220 penetrates both the through hole 2215 and the through hole 2233, and is fixed by nuts from above and below each through hole. When the link member 220 operates, the first link member 221 and the second link member 223 operate as an integral body. By adopting the configuration as shown in FIG. 5C, the locking position between the locking member 230 and the first locking portion 2211, which will be described later, can be adjusted even if the processing accuracy of each member varies. can do.

In FIG. 4A, the detailed configuration of the first link member 221 and the second link member 223 is omitted.

FIG. 6 is a side view (A) and a top view (B) showing a lock member of an assist mechanism according to an embodiment of the present invention. The top view of FIG. 6B is a top view of FIG. 6A viewed from the direction of the arrow. As shown in FIG. 6, the lock member 230 is provided with a second locking portion 2301, a third locking portion 2303, a sliding portion 2305, and a receiving portion 2307. Each of the second locking portion 2301 and the third locking portion 2303 has a concave shape. These concave shapes are preferably shaped along the outer shape of the first locking portion 2211 in the region to be locked to the second locking portion 2301 and the third locking portion 2303. By locking the first locking portion 2211 to the second locking portion 2301 or the third locking portion 2303, the rotation of the link member 220 and the rotation of the lock member 230 are restricted. Further, the lock member 230 is provided with a connection portion 299-1 with the pedestal 123. The shape of the connecting portion 299-1 is a cylindrical shape. The lock member 230 is pivotally supported by the pin 298 by inserting the pin 298 (see FIG. 4B) described later into the hollow portion of the cylinder of the connecting portion 299-1. The lock member 230 is provided with a connecting portion 281 to which the first elastic member 250 is connected. In the present embodiment, the shape of the connecting portion 281 is a cylindrical shape, but a shape other than the cylindrical shape may be used.

Although the details will be described later, the rotation of the apron 130 in the direction in which the apron 130 is flipped up is restricted by locking the first locking portion 2211 to the second locking portion 2301. In other words, the operation of the assist member 210 is restricted by locking the first locking portion 2211 to the second locking portion 2301. On the other hand, by locking the first locking portion 2211 to the third locking portion 2303, the rotation of the apron 130 in the descending direction is restricted.

The sliding portion 2305 is provided between the second locking portion 2301 and the third locking portion 2303. When the apron 130 is flipped up or down, the first locking portion 2211 of the link member 220 slides with the sliding portion 2305. The receiving portion 2307 receives the operating member 240 that rotates toward the receiving portion 2307. Although the details will be described later, when the receiving portion 2307 receives the operating member 240, the lock member 230 rotates together with the operating member 240.

FIG. 7 is a side view (A) and a top view (B) showing an operating member of the assist mechanism according to the embodiment of the present invention. The top view of FIG. 7B is a top view seen from the direction of the arrow of FIG. 7A. As shown in FIG. 7, the operating member 240 has a handle portion 2401, a lever portion 2403, and a contact portion 2405. The operation member 240 is provided with a connection portion 299-2 with the pedestal 123. The shape of the connecting portion 299-2 is a cylindrical shape. By inserting the pin 298 (see FIG. 4B) described later into the hollow portion of the cylinder of the connecting portion 299-2, the operating member 240 is pivotally supported by the pin 298. The lever portion 2403 extends in a direction away from the connecting portion 299. A handle portion 2401 is provided at the tip of the lever portion 2403. The contact portion 2405 is provided at a position closer to the connection portion 299 than the handle portion 2401 and the lever portion 2403. When the operating member 240 rotates about the connecting portion 299, the contact portion 2405 comes into contact with the receiving portion 2307 of the lock member 230. When the contact portion 2405 presses the receiving portion 2307, the lock member 230 rotates together with the operating member 240. The contact portion 2405 also functions as a connecting portion 283 to which the first elastic member 250 and the second elastic member 260 are connected.

FIG. 8 is a side view (A) and a top view (B) showing an urging member of an assist mechanism according to an embodiment of the present invention. The top view of FIG. 8 (B) is a top view seen from the direction of the arrow of FIG. 8 (A). As shown in FIG. 8, the urging member 270 has an urging portion 2701, a rotational power generating portion 2703, a first sliding portion 2705, and a second sliding portion 2707. The urging member 270 is provided with a connection portion 299-3 with the pedestal 123. The shape of the connecting portion 299-3 is a cylindrical shape. The urging member 270 is pivotally supported by the pin 298 by inserting the pin 298 (see FIG. 4B) described later into the hollow portion of the cylinder of the connecting portion 299-3. When the apron 130 is flipped up, the first locking portion 2211 of the link member 220 slides with the first sliding portion 2705. When the apron 130 is lowered, the first locking portion 2211 slides with the second sliding portion 2707. When the first locking portion 2211 sliding with the first sliding portion 2705 or the second sliding portion 2707 rides on the rotational power generating portion 2703, the urging member 270 rotates about the connecting portion 299. In other words, by sliding the first locking portion 2211 and the rotational power generating portion 2703, the rotational power generating portion 2703 generates rotational power in the urging member 270, and the urging member 270 rotates.

As described above, when the urging member 270 rotates due to the sliding between the first locking portion 2211 and the rotational power generating portion 2703, the urging portion 2701 contacts and presses the contact portion 2405 of the operating member 240. , The operating member 240 rotates.

Hereinafter, the connection relationship of each of the above members will be described with reference to FIGS. 4A and 4B.

As shown in FIG. 4A, the assist member 210 is rotatably connected to the pedestal 123 at the connecting portion 291. The first link member 221 is rotatably connected to the assist member 210 at the connecting portion 293. As shown in FIG. 5C, the first link member 221 and the second link member 223 are fixed to each other so as not to rotate. Both the first link member 221 and the second link member 223 are rotatably connected to the pedestal 123 at the connecting portion 295. Therefore, both the first link member 221 and the second link member 223 rotate around the connecting portion 295. The third link member 225 is rotatably connected to the second link member 223 at the connecting portion 297. As shown in FIGS. 2 and 3, the third link member 225 is rotatably connected to the apron 130. In other words, the link member 220 is rotatably connected to the apron 130 and the assist member 210, respectively. In the present embodiment, the configuration in which the assist member 210 is connected to the pedestal 123 (a part of the first cover member) is illustrated, but the configuration is not limited to this configuration. For example, the assist member 210 may be connected to a main body other than the pedestal 123 (main frame 110, shield cover 120, or other member fixed so as not to rotate with respect to the main frame 110). That is, the assist member 210 is rotatable with respect to the main body including the shield cover 120.

The lock member 230, the operating member 240, and the urging member 270 are rotatably connected to the pedestal 123 at the connecting portion 299. The lock member 230 and the operation member 240 are connected by a first elastic member 250. Specifically, the first elastic member 250 is connected to the connecting portion 281 of the lock member 230 and the connecting portion 283 (contact portion 2405) of the operating member 240. The operating member 240 and the pedestal 123 are connected by a second elastic member 260. Specifically, the second elastic member 260 is connected to the connecting portion 283 (contact portion 2405) of the operating member 240 and the connecting portion 285 provided on the pedestal 123. In the present embodiment, the configuration in which the lock member 230, the operation member 240, and the urging member 270 are connected to the pedestal 123 has been illustrated, but the configuration is not limited to this configuration. For example, the lock member 230, the operation member 240, and the urging member 270 may be connected to a main body other than the pedestal 123. That is, the lock member 230, the operation member 240, and the urging member 270 are rotatable with respect to the main body including the shield cover 120.

As shown in FIG. 4B, the pedestal 123 includes a pair of plate-shaped members 125, and between the pair of plate-shaped members 125, an assist member 210, a lock member 230, an operation member 240, a first elastic member 250, and a biasing member 125. A member 270 is provided. In order to distinguish the operating member 240 from other members, the line indicating the operating member 240 is displayed thicker than the line indicating the other member. Although not shown in FIG. 4B, the link member 220 is also provided between the pair of plate-shaped members 125. A pin 298 is provided between the pair of plate-shaped members 125. The pin 298 is inserted into the connecting portion 299-1 of the lock member 230, the connecting portion 299-2 of the operating member 240, and the connecting portion 299-3 of the urging member 270. That is, the pin 298 pivotally supports the lock member 230, the operating member 240, and the urging member 270. The shapes of the lock member 230, the operation member 240, and the urging member 270 are as shown in FIGS. 6 to 8. The second elastic member 260 is connected to the connecting portion 283 and the connecting portion 285 on the outside of the pair of plate-shaped members 125.

[Operation of assist mechanism 200]
The operation of the assist mechanism 200 in the flip-up and lowering operations of the apron 130 will be described with reference to FIGS. 9 to 16. As described above, the second elastic member 260 is connected to the operating member 240 at the connecting portion 283 and to the pedestal 123 at the connecting portion 285. Then, the operating member 240 rotates around the connecting portion 299. When the operating member 240 is rotated by the operation of the operator, the second elastic member 260 is extended. Restoring force is generated in the extended second elastic member 260. The restoring force causes the operating member 240 to generate rotational power centered on the connecting portion 299.

The direction of the rotational power changes (reverses) depending on the inclination of the operating member 240. As shown in FIG. 9B, when the line connecting the connecting portion 283 and the connecting portion 285 is on the first direction D1 side of the center of the connecting portion 299 (rotation axis of the operating member 240), the second The direction of the rotational power of the operating member 240 generated by the elastic member 260 is the first direction D1. This state is called the "first state". On the other hand, when the line connecting the connecting portion 283 and the connecting portion 285 is on the second direction D2 side of the center of the connecting portion 299 (rotation axis of the operating member 240), the operating member 240 generated by the second elastic member 260. The direction of the rotational power is the second direction D2. This state is called the "second state". The first direction D1 is a direction in which the operating member 240 is separated from the urging member 270. The second direction D2 is the direction in which the operating member 240 is pressed against the urging member 270.

That is, in the rotation range of the operation member 240, the operation member 240 is in the first state in which the operation member 240 is given the rotational power in the first direction D1 by the second elastic member 260, and the operation member 240 by the second elastic member 260. It is possible to take a second state in which the rotational power of the second direction D2 is applied to the 240.

The operation of the assist mechanism 200 when the apron 130 is flipped up will be described with reference to FIGS. 9 to 13.

FIG. 9 is a side view (A) and an enlarged side view (B) showing a first locked state of the lock member in the assist mechanism according to the embodiment of the present invention. As shown in FIG. 9A, the apron 130 is in the lowered state in the first locked state. This state is a tilling work state.

As shown in FIG. 9B, in the first locked state, the first locking portion 2211 of the link member 220 is locked to the second locking portion 2301 of the locking member 230. Therefore, the rotation of the link member 220 in the second direction D2 about the connecting portion 295 is restricted. In other words, the movement of the assist member 210 in the extending direction is restricted. That is, the assist mechanism 200 does not assist the power to flip up the apron 130. The first locked state is the first state. That is, the second elastic member 260 generates rotational power in the first direction D1 on the operation member 240. As a result, the contact portion 2405 of the operating member 240 presses the receiving portion 2307 of the lock member 230 against the first direction D1. Therefore, the lock member 230 is generated with rotational power in the first direction D1.

FIG. 10 is a side view (A) and an enlarged side view (B) showing a first unlock preparation state of the lock member in the assist mechanism according to the embodiment of the present invention. As shown in FIG. 10A, in the first lock state shown in FIG. 9, the state in which the operator rotates the operation member 240 in the second direction D2 is the first lock release preparation state. In this state, the apron 130 remains in the lowered state.

As shown in FIG. 10B, in the first unlock preparation state, the operating member 240 rotates around the connecting portion 299 in the second direction D2, and a line connecting the connecting portion 283 and the connecting portion 285 is formed. It is on the D2 side in the second direction from the center of the connecting portion 299 (rotating shaft of the operating member 240). That is, in the first unlock preparation state, the operation member 240 is in the second state. In the first unlock preparation state, the contact portion 2405 separates from the receiving portion 2307 and comes into contact with the urging portion 2701 of the urging member 270. Here, since the operating member 240 is generated with rotational power in the second direction D2, the contact portion 2405 presses the urging portion 2701 against the second direction D2. By this pressing, the urging member 270 rotates around the connecting portion 299 in the second direction D2. The rotation of the urging member 270 in the second direction D2 is stopped when the first sliding portion 2705 of the urging member 270 contacts the first locking portion 2211.

Further, in the first lock release ready state, the first elastic member 250 is extended by the rotation of the operation member 240. The extended restoring force of the first elastic member 250 causes the lock member 230 to generate rotational power in the second direction D2 centered on the connecting portion 299. The second direction D2 is a direction in which the first locking portion 2211 and the second locking portion 2301 are unlocked. In other words, due to the rotation of the operating member 240, the first elastic member 250 rotates with respect to the locking member 230 in the direction in which the first locking portion 2211 and the second locking portion 2301 are disengaged. Give power.

Since the contact portion 2405 is separated from the receiving portion 2307 by the rotation of the operating member 240, the rotational power of the lock member 230 in the first direction D1 by the contact portion 2405 is lost. However, the assist member 210 presses the first locking portion 2211 against the second locking portion 2301. Further, a part of the concave shape of the second locking portion 2301 is locked to the first locking portion 2211 to regulate the rotation of the second direction D2 around the connecting portion 299 of the lock member 230. .. Therefore, the first locked state is not released only by rotating the operating member 240.

FIG. 11 is a side view (A) and an enlarged side view (B) showing an unlocked state of the lock member in the assist mechanism according to the embodiment of the present invention. As shown in FIG. 11A, when the apron 130 is pushed in the direction of the arrow in the first unlock preparation state, the apron 130 rotates in the first direction D1 about the connection portion 140. As the apron 130 rotates, the second link member 223 is pulled downward via the third link member 225. Therefore, the link member 220 rotates around the connecting portion 295 in the first direction D1. As a result, the first locking portion 2211 and the second locking portion 2301 are released from each other, and the first locked state is released.

As shown in FIG. 11B, when the first locking portion 2211 and the second locking portion 2301 are disengaged, the locking member 230 is connected by the restoring force of the extended first elastic member 250. It rotates in the second direction D2 around the portion 299. As a result, even if the link member 220 rotates in the second direction D2 about the connecting portion 295 due to the extension of the assist member 210, the first locking portion 2211 is not locked to the second locking portion 2301. At this time, since the contact portion 2405 presses the urging portion 2701 against the second direction D2 as described above, the urging member 270 is generated rotational power in the second direction D2 centered on the connecting portion 299. .. Therefore, the first locking portion 2211 and the first sliding portion 2705 slide while the first sliding portion 2705 presses the first locking portion 2211 against the second direction D2.

FIG. 12 is a side view (A) and an enlarged side view (B) showing a state in which the operating member is switched from the second state to the first state by the urging member in the assist mechanism according to the embodiment of the present invention. Is. As shown in FIG. 12A, in the unlocked state, the apron 130 rotates in the second direction D2 around the connecting portion 140. As the apron 130 rotates in the second direction D2, the second link member 223 is pushed upward via the third link member 225. Therefore, the link member 220 rotates around the connecting portion 295 in the second direction D2.

As shown in FIG. 12B, the first locking portion 2211 and the first sliding portion 2705 are in a state where the first sliding portion 2705 presses the first locking portion 2211 in the second direction D2. Since it slides, when the link member 220 rotates in the second direction D2 about the connecting portion 295, the first locking portion 2211 rides on the rotational power generating portion 2703. By this riding, the rotational power generation unit 2703 is pushed by the first locking unit 2211, so that the urging member 270 rotates around the connection unit 299 in the first direction D1. Due to the rotation of the urging member 270, the contact portion 2405 is pushed in the first direction D1 by the urging portion 2701, so that the operating member 240 rotates in the first direction D1 around the connecting portion 299. In other words, the rotation of the link member 220 causes the first locking portion 2211 and the rotational power generation portion 2703 to slide, and this sliding causes the urging member 270 to rotate.

Due to the rotation of the operating member 240 in the first direction D1, the line connecting the connecting portion 283 and the connecting portion 285 moves to the first direction D1 side from the center of the connecting portion 299 (rotating axis of the operating member 240). .. That is, the operation member 240 is switched from the second state to the first state by the rotation of the operation member 240. In other words, the urging member 270 acts on the operating member 240 in the direction in which the operating member 240 switches from the second state to the first state. Since the state shown in FIG. 12 is the state after the operating member 240 is switched from the second state to the first state, the contact portion 2405 is separated from the urging portion 2701.

When the operating member 240 is switched from the second state to the first state, the first elastic member 250 is restored from the extended state, so that the rotational power in the second direction D2 centered on the connecting portion 299 of the lock member 230 is applied. It will be relaxed. Due to the relaxation of the rotational power, the lock member 230 rotates in the first direction D1 about the connecting portion 299 due to its own weight. The rotation of the lock member 230 in the first direction D1 is stopped when the sliding portion 2305 of the lock member 230 comes into contact with the first locking portion 2211. When the apron 130 further rotates in the second direction D2 in this state, the first locking portion 2211 slides with the sliding portion 2305. In other words, in the first state after the operating member 240 is switched from the second state to the first state, the first locking portion 2211 slides with the sliding portion 2305.

FIG. 13 is a side view (A) and an enlarged side view (B) showing a second locked state of the lock member in the assist mechanism according to the embodiment of the present invention. As shown in FIG. 13A, the apron 130 further rotates in the second direction D2 around the connecting portion 140, and the second link member 223 is further pushed upward via the third link member 225.

As shown in FIG. 13B, when the first locking portion 2211 crosses the end portion of the sliding portion 2305 while sliding with the sliding portion 2305, the lock member 230 is connected by its own weight to the connecting portion 299. Rotates in the first direction D1 around. Then, the first locking portion 2211 is locked to the third locking portion 2303. This state is the second lock state. In the second locked state, the operating member 240 is in the first state as in the first locked state. In the second locked state, the rotation of the link member 220 around the connecting portion 295 in the first direction D1 is restricted. That is, the lowering motion of the apron 130 is restricted.

The operation of the assist mechanism 200 when the apron 130 is lowered will be described with reference to FIGS. 14 to 16.

FIG. 14 is a side view (A) and an enlarged side view (B) showing a second unlock preparation state of the lock member in the assist mechanism according to the embodiment of the present invention. As shown in FIG. 14A, in the second lock state shown in FIG. 13, the state in which the operator rotates the operation member 240 in the second direction D2 is the second lock release preparation state. In this state, the apron 130 remains flipped up.

As shown in FIG. 14B, in the second unlock preparation state, the operating member 240 rotates around the connecting portion 299 in the second direction D2, and a line connecting the connecting portion 283 and the connecting portion 285 is formed. It is on the D2 side in the second direction from the center of the connecting portion 299 (rotating shaft of the operating member 240). That is, in the second lock release preparation state, the operation member 240 is in the second state. In the second unlock preparation state, the contact portion 2405 comes into contact with the urging portion 2701 of the urging member 270. Here, since the operating member 240 is generated with rotational power in the second direction D2, the contact portion 2405 presses the urging portion 2701 against the second direction D2. By this pressing, the urging member 270 rotates around the connecting portion 299 in the second direction D2. The rotation of the urging member 270 in the second direction D2 is stopped when the second sliding portion 2707 of the urging member 270 comes into contact with the first locking portion 2211.

Further, in the second lock release ready state, the first elastic member 250 is extended by the rotation of the operation member 240. The extended restoring force of the first elastic member 250 causes the lock member 230 to generate rotational power in the second direction D2 centered on the connecting portion 299. The second direction D2 is a direction in which the first locking portion 2211 and the third locking portion 2303 are unlocked. In other words, due to the rotation of the operating member 240, the first elastic member 250 rotates with respect to the locking member 230 in the direction in which the first locking portion 2211 and the third locking portion 2303 are unlocked. Give power.

In the above state, a part of the concave shape of the third locking portion 2303 is locked to the first locking portion 2211 so that the rotation of the second direction D2 about the connecting portion 299 of the lock member 230 can be performed. It is regulated. Therefore, the second locked state is not released only by rotating the operating member 240.

FIG. 15 is a side view (A) and an enlarged side view (B) showing an unlocked state of the lock member in the assist mechanism according to the embodiment of the present invention. As shown in FIG. 15A, when the apron 130 is pushed in the direction of the arrow in the second unlock preparation state, the apron 130 rotates in the second direction D2 around the connection portion 140. As the apron 130 rotates, the second link member 223 is lifted upward via the third link member 225. Therefore, the link member 220 rotates around the connecting portion 295 in the second direction D2. As a result, the first locking portion 2211 and the third locking portion 2303 are released from each other, and the second locked state is released.

As shown in FIG. 15B, when the first locking portion 2211 and the third locking portion 2303 are disengaged, the locking member 230 is connected by the restoring force of the extended first elastic member 250. It rotates in the second direction D2 around the portion 299. As a result, even if the link member 220 rotates in the first direction D1 about the connecting portion 295 by the weight of the apron 130 or the operation of the operator, the first locking portion 2211 is locked to the third locking portion 2303. Not done. At this time, since the contact portion 2405 presses the urging portion 2701 against the second direction D2 as described above, the urging member 270 is generated rotational power in the second direction D2 centered on the connecting portion 299. .. Therefore, the first locking portion 2211 and the second sliding portion 2707 slide while the second sliding portion 2707 presses the first locking portion 2211 against the second direction D2.

FIG. 16 is a side view (A) and an enlarged side view (B) showing a state in which the operating member is switched from the second state to the first state by the urging member in the assist mechanism according to the embodiment of the present invention. Is. As shown in FIG. 16A, in the unlocked state, the apron 130 rotates around the connection portion 140 in the first direction D1. As the apron 130 rotates in the first direction D1, the second link member 223 is pulled downward via the third link member 225. Therefore, the link member 220 rotates around the connecting portion 295 in the first direction D1.

As shown in FIG. 16B, the first locking portion 2211 and the second sliding portion 2707 are in a state where the second sliding portion 2707 presses the first locking portion 2211 in the second direction D2. Since it slides, when the link member 220 rotates in the first direction D1 about the connecting portion 295, the first locking portion 2211 rides on the rotational power generating portion 2703. By this riding, the rotational power generation unit 2703 is pushed by the first locking unit 2211, so that the urging member 270 rotates around the connection unit 299 in the first direction D1. Due to the rotation of the urging member 270, the contact portion 2405 is pushed in the first direction D1 by the urging portion 2701, so that the operating member 240 rotates in the first direction D1 around the connecting portion 299. In other words, the rotation of the link member 220 causes the first locking portion 2211 and the rotational power generation portion 2703 to slide, and this sliding causes the urging member 270 to rotate.

Due to the rotation of the operating member 240 in the first direction D1, the line connecting the connecting portion 283 and the connecting portion 285 moves to the first direction D1 side from the center of the connecting portion 299 (rotating axis of the operating member 240). .. That is, the operation member 240 is switched from the second state to the first state by the rotation of the operation member 240. In other words, the urging member 270 acts on the operating member 240 in the direction in which the operating member 240 switches from the second state to the first state.

When the operating member 240 is switched from the second state to the first state, the first elastic member 250 is restored from the extended state, so that the rotational power in the second direction D2 centered on the connecting portion 299 of the lock member 230 is applied. It will be relaxed. Due to the relaxation of the rotational power, the lock member 230 rotates in the first direction D1 about the connecting portion 299 due to its own weight. The rotation of the lock member 230 in the first direction D1 is stopped when the sliding portion 2305 of the lock member 230 comes into contact with the first locking portion 2211. When the apron 130 further rotates in the first direction D1 in this state, the first locking portion 2211 slides with the sliding portion 2305. In other words, in the first state after the operating member 240 is switched from the second state to the first state, the first locking portion 2211 slides with the sliding portion 2305.

From the state shown in FIG. 16, the apron 130 further rotates in the first direction D1 around the connecting portion 140, and the first locking portion 2211 slides with the sliding portion 2305 at the end of the sliding portion 2305. When it exceeds, the first locked state shown in FIG. 9 is reached.

As described above, according to the working machine 10 having the assist mechanism 200 according to the first embodiment, the locked state of the assist mechanism 200 can be released only by rotating the operation member 240 and moving the apron 130. Further, since the operating member 240 is rotated by the urging member 270 during the rotating operation of the apron 130, the assist mechanism 200 can be automatically locked when the flipping or lowering operation of the apron 130 is completed. .. As described above, according to the present invention, it is possible to provide the working machine 10 having the assist mechanism 200 having a simple structure.

The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit.

10: Work machine, 102: Tiller rotor, 104: Rotating shaft, 105: Chain case, 106: Tillage claw, 110: Main frame, 111: Pedestal, 120: Shield cover, 121: Rubber sheet, 123: Pedestal, 130: Apron, 131: Ground preparation plate, 133: Extension ground preparation plate, 135: Rubber sheet, 140: Connection part, 142: Compression rod, 200: Assist mechanism, 210: Assist member, 220: Link member, 221: First link member, 223: 2nd link member, 225: 3rd link member, 230: lock member, 240: operation member, 250: 1st elastic member, 260: 2nd elastic member, 270: urging member, 281, 283, 285, 291: 293, 295, 297, 299: Connection part, 2211: First locking part, 2213: Top plate part, 2215: Through hole, 2219: Flat plate part, 2231: Top plate part, 2233: Through hole, 2301: 2nd locking part, 2303: 3rd locking part, 2305: sliding part, 2307: receiving part, 2401: handle part, 2403: lever part, 2405: contact part, 2701: urging part, 2703: rotational power Generating part, 2705: 1st sliding part, 2707: 2nd sliding part

Claims (9)

The first cover member and
A second cover member rotatably connected to the first cover member,
An assist member that assists the power to flip up the second cover member, and
A link member having a first locking portion and rotatably connected to the second cover member and the assist member, respectively.
A lock member having a second locking portion and a third locking portion,
Have,
By locking the first locking portion to the second locking portion, the operation of the assist member is restricted.
When the first locking portion is locked to the third locking portion, the operation of the link member accompanying the downward rotation of the second cover member and the first locking portion and the third engaging portion are engaged. A work machine in which the rotation of the lock member in a direction in which the lock with the stop portion is released is restricted. The working machine according to claim 1, wherein the first locking portion is fixed to the link member. An operating member that can rotate with respect to the first cover member,
A first elastic member that connects the lock member and the operation member,
Have more
By the rotation of the operating member, the first elastic member is in a direction in which the first locking portion and the second locking portion are disengaged from the locking member, or with the first locking portion. The working machine according to claim 2, wherein a rotational power is applied in a direction in which the lock with the third locking portion is released. It further has a second elastic member that connects the first cover member and the operation member.
In the rotation range of the operating member, the operating member is in a first state in which the operating member is subjected to rotational power in the first direction by the second elastic member, and the operating member is subjected to the operation member by the second elastic member. The working machine according to claim 3, which can take a second state in which rotational power is applied in a second direction opposite to that in the first direction. The working machine according to claim 4, further comprising an urging member that acts on the operating member in a direction in which the operating member switches from the second state to the first state. The first direction is a direction in which the operating member separates from the urging member.
The working machine according to claim 5, wherein the second direction is a direction in which the operating member is pressed against the urging member. The urging member has a rotational power generating portion that generates rotational power in the urging member by sliding with the first locking portion.
The work according to claim 6, wherein the urging member is rotated by sliding between the first locking portion and the rotational power generating portion, and the operating member is switched from the second state to the first state. Machine. The lock member has a sliding portion and has a sliding portion.
In the second state, the first locking portion slides on the urging member and
The working machine according to claim 7, wherein in the first state after the operating member is switched from the second state to the first state, the first locking portion slides with the sliding portion. The working machine according to claim 8, wherein the sliding portion is provided between the second locking portion and the third locking portion.

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