JP6818627B2 - Front loader attachment / detachment structure, front loader and work vehicle - Google Patents

Description

The present invention relates to a structure for attaching and detaching a front loader mounted on a work vehicle such as a tractor, and a technique for the front loader and the work vehicle.

Conventionally, a technique for attaching / detaching a front loader to be mounted on a work vehicle such as a tractor has been known. For example, as described in Patent Document 1.

Patent Document 1 describes a tractor provided with a front loader for loading earth and sand. The front loader is attached to the vehicle body of the tractor via a work support portion attached to the main frame.

Such a front loader is removed from the vehicle body when it is not needed, and attached to the vehicle body when it is needed. Therefore, there is a demand for a front loader that can be easily attached to and detached from the vehicle body.

Japanese Unexamined Patent Publication No. 2011-126325

The present invention has been made in view of the above circumstances, and the problem to be solved is to provide a front loader attachment / detachment structure, a front loader, and a work vehicle capable of facilitating attachment / detachment work to / from a vehicle body. It is to be.

The problem to be solved by the present invention is as described above, and next, the means for solving this problem will be described.

That is, in claim 1, the subframe that supports the boom moves between the engaging position that engages with the main frame provided on the vehicle body and the disengaging position that is disengaged from the main frame. The engaging member moves from the engaging position to the disengaging direction to the engaging member that is possibly supported and urged in the disengaging direction from the engaging position to the disengaging position and the subframe. A regulatory member movably supported between a regulatory position that regulates and a regulatory release position that allows the engaging member to move to the release position, and the regulatory member at the regulatory position and the regulation. A holding mechanism for holding at the release position is provided, and the regulation member is urged in a regulation direction from the regulation release position to the regulation position, and the engagement member is urged from the release position to the engagement position. When moving toward, the holding mechanism is formed so as to follow the engaging member and move from the regulation release position to the regulation direction, and the holding mechanism is at an intermediate position between the regulation position and the regulation release position. A detent mechanism for locking the restricting member so as not to move in the restricting direction is provided, and the engaging member is in a state in which the restricting member is locked at the intermediate position by the detent mechanism in the releasing direction. When moving to, the regulating member is pressed and moved to the regulation release position .

In claim 2, the restricting member is formed so as to abut the engaging member located at the engaging position at the restricting position and restrict the movement of the engaging member in the disengaging direction. Is what you are doing.

In claim 3, the engaging member is formed so as to be swingably supported by the subframe between the engaging position and the disengaging position.

In claim 4, the regulating member is formed on the subframe so as to be swingably supported between the regulating position and the regulation release position.

In claim 5, when the main frame moves relative to the subframe, the engaging member moves from the disengaging position to the engaging position by the pressing force of the main frame. It is formed like this.

In claim 6, the holding mechanism for holding the regulation member at the regulation position and the regulation release position is provided .

In claim 7, the detent mechanism is provided with a locking portion urged to abut the outer peripheral portion of the regulating member and the regulating member, and is locked by the locking portion at the intermediate position. It is provided with a locked portion .

In claim 8, when the regulation member moves from the regulation release position toward the regulation direction, the locking portion is prevented from being locked to the locked portion at the intermediate position. It is provided with a control member .

In claim 9, the control member presses the locking portion against the urging force received by the locking portion at the intermediate position, so that the locking portion engages with the locked portion. It is formed to avoid being stopped .

In claim 10, the engaging member is formed so as to be swingably supported by the subframe between the engaging position and the disengaging position, and the regulating member is the sub. The frame is formed so as to be swingably supported between the regulation position and the regulation release position, and the swing axis of the engaging member is parallel to the swing axis of the regulation member. The contact portion of the regulating member with the engaging member is formed in an arc shape centered on the swinging axis of the regulating member in the direction of the swinging axis of the regulating member. The radius of curvature of the contact portion of the engaging member with the regulating member is substantially the same as the radius of curvature of the contact portion of the regulating member with the engaging member in the direction of the swing axis of the engaging member. It is formed in an arc shape .

In claim 11, the subframe that supports the boom can be moved between an engaging position that engages with the main frame provided on the vehicle body and an disengaging position that disengages the main frame. The engaging member, which is supported and urged in the disengaging direction from the engaging position to the disengaging position, and the subframe move the engaging member from the engaging position to the disengaging direction. It comprises a restricting position that is movably supported between a restricting position to be regulated and a restricting release position that allows the engaging member to move to the disengaging position, the engaging member being the sub. The frame is formed so as to be swingably supported between the engaging position and the disengaging position, and the restricting member is formed on the subframe between the restricting position and the disregulating position. The swing shaft of the engaging member is provided so as to be parallel to the swing shaft of the regulating member, and is formed so as to be swingably supported by the regulating member. The contact portion of the regulating member is formed in an arc shape centered on the swing axis of the regulating member in the direction of the swing axis of the regulating member, and the contact portion of the engaging member with the regulating member is In the direction of the swing axis of the engaging member, the radius of curvature is formed in an arc shape substantially the same as the radius of curvature of the portion of the regulating member in contact with the engaging member .

In claim 12, the restricting member is formed so that the pressing force received from the engaging member located at the engaging position at the restricting position is directed toward the swing center of the regulating member. is there.

In claim 13, the subframe that supports the boom can be moved between an engaging position that engages with the main frame provided on the vehicle body and an disengaging position that disengages the main frame. The engaging member, which is supported and urged in the disengaging direction from the engaging position to the disengaging position, and the subframe move the engaging member from the engaging position to the disengaging direction. A restricting member that is movably supported between a restricting position to be regulated and a restricting release position that allows the engaging member to move to the disengaging position, wherein the engaging member is the main. When the frame moves relative to the subframe so as to be close to the subframe, it is formed so as to move from the release position to the engagement position by the pressing force of the main frame .

In claim 14, the operating tool for moving the regulation member is provided.

15. The attachment / detachment structure according to any one of claims 1 to 14 is provided.

The 16th aspect includes the front loader according to the 15th aspect.

As the effect of the present invention, the following effects are exhibited.

In claim 1, it is possible to facilitate the work of attaching / detaching to / from the vehicle body. Specifically, the engaging member can be easily moved to the releasing position by simply moving the restricting member to the deregulation position, and the engagement between the engaging member and the main frame can be disengaged. Further, when the engaging member returns to the engaging position and is engaged with the main frame, the regulating member can be returned to the regulating position, and the movement of the engaging member in the disengaging direction can be restricted by the regulating member. it can. In addition, it is possible to prevent the engaging member from moving vigorously to the release position.

In claim 2, the movement of the engaging member in the disengaging direction can be restricted by a simple structure.

In claim 3, the engaging member can be engaged with the main frame and the engaging member and the main frame can be disengaged with a simple structure.

In claim 4, with a simple structure, it is possible to regulate the movement of the engaging member from the engaging position in the disengaging direction, and it is possible to release the restriction on the movement of the engaging member.

In claim 5, the engaging member can be easily engaged with the main frame by bringing the vehicle body close to the subframe removed from the vehicle body (main frame).

In claim 6, by holding the regulating member at the regulated position, the engaging member can be held at the engaging position. Further, by holding the restricting member in the regulation release position, the engaging member can be held in the release position .

In claim 7, the regulating member can be held at an intermediate position by locking the locking portion to the locked portion .

In claim 8, when the regulation member is moved from the regulation release position to the regulation release position, the regulation member can be held at an intermediate position, and the regulation member is directed from the regulation release position to the regulation position. When moving, the restricting member can be moved to the regulated position without being held at the intermediate position .

In claim 9, when the regulating member is moved from the deregulation position to the regulation position with a simple structure, the regulation member can be moved to the regulation position without being held at the intermediate position .

In claim 10, the regulating member can be swung without being hindered by the engaging member .

In claim 11, it is possible to facilitate the work of attaching / detaching to / from the vehicle body. Specifically, the engaging member can be easily moved to the releasing position by simply moving the restricting member to the deregulation position, and the engagement between the engaging member and the main frame can be disengaged. In addition, the regulating member can be swung without being hindered by the engaging member .

In claim 12, when the regulating member regulates the swing of the engaging member, it is possible to prevent the regulating member from swinging due to the pressing force received from the engaging member .

In claim 13, it is possible to facilitate the work of attaching / detaching to / from the vehicle body. Specifically, the engaging member can be easily moved to the releasing position by simply moving the restricting member to the deregulation position, and the engagement between the engaging member and the main frame can be disengaged. Further, by bringing the vehicle body close to the subframe removed from the vehicle body (main frame), the engaging member can be easily engaged with the main frame .

In claim 14, the regulating member can be easily moved by using the operating tool.

In claim 15, it is possible to provide a front loader capable of facilitating the work of attaching / detaching to / from the vehicle body.

In claim 16, it is possible to provide a work vehicle capable of facilitating the work of attaching and detaching the front loader to and from the vehicle body.

The side view which showed the overall structure of the tractor which attached the front loader which concerns on one Embodiment of this invention. Side view of the front loader attached to the airframe frame, etc. Left side view of the top of the mainframe. Upper right perspective view of the subframe unit. Top left perspective view of the subframe unit. Enlarged view of the main part of FIG. Left side view showing the attachment / detachment structure of the main frame and the subframe unit. (A) Left side view showing a part of the subframe unit held in the main frame. (B) A partially enlarged view of FIG. 8 (a). (A) Left side view showing a part of the subframe unit being removed from the main frame. (B) A partially enlarged view of FIG. 9 (a). (A) Left side view showing a part of the subframe unit being removed from the main frame. (B) A partially enlarged view of FIG. 10 (a). (A) Left side view showing a part of the subframe unit in a state of being removed from the main frame. (B) A partially enlarged view of FIG. 11 (a). Left side view showing a part of the main frame and the subframe unit before mounting the subframe unit on the main frame. Left side view showing a part of the main frame and the subframe unit in the process of mounting the subframe unit on the main frame. (A) Left side view showing a part of the subframe unit being mounted on the main frame. (B) A partially enlarged view of FIG. 14 (a). (A) Left side view showing a part of the subframe unit being mounted on the main frame. (B) A partially enlarged view of FIG. 15 (a). (A) Left side view showing a part of the subframe unit being mounted on the main frame. (B) A partially enlarged view of FIG. 16 (a). Left side view showing a part of the main frame and the subframe unit in the process of mounting the subframe unit on the main frame. Left side view showing a part of the main frame and the subframe unit with the subframe unit mounted on the main frame. The left side view which showed a part of the subframe unit which concerns on another example.

In the following, the directions indicated by the arrows U, D, arrow F, arrow B, arrow L, and arrow R in the drawing are defined as upward, downward, forward, backward, left, and right, respectively. I will explain.

First, the overall configuration of the vehicle body 1 of the tractor including the front loader 20 according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

The tractor mainly includes an airframe frame 2, an engine 3, a transmission case 4, front wheels 5, rear wheels 6, a bonnet 7, SCR8, a muffler 9, a cabin 10, a steering wheel 11, and a front loader 20.

The airframe frame 2 is a frame-shaped member formed by appropriately combining a plurality of plate materials. The airframe frame 2 is formed in a substantially rectangular shape in a plan view. The airframe frame 2 is arranged at the front portion of the vehicle body 1 with its longitudinal direction facing the front-rear direction. The engine 3 is fixed to the rear part of the airframe frame 2. A transmission case 4 is fixed to the rear part of the engine 3. The front portion of the fuselage frame 2 is supported by a pair of left and right front wheels 5 via a front axle mechanism (not shown). The rear portion of the transmission case 4 is supported by a pair of left and right rear wheels 6 via a rear axle mechanism (not shown). The engine 3 is covered with the bonnet 7.

An SCR (Selective Catalytic Reduction) 8 for purifying the exhaust gas of the engine 3 is arranged on the right side of the bonnet 7. A muffler 9 for exhausting the exhaust gas of the engine 3 is arranged on the upper part of the SCR 8. The SCR 8 and the muffler 9 are fixed to the transmission case 4.

The power of the engine 3 is changed by a transmission (not shown) housed in the transmission case 4, and then can be transmitted to the front wheels 5 via the front axle mechanism, and the rear wheels 6 pass through the rear axle mechanism. It is said that it can be transmitted to. The front wheels 5 and the rear wheels 6 are rotationally driven by the power of the engine 3, and the tractor can travel.

A cabin 10 is provided behind the engine 3. A living space for the driver to board is formed inside the cabin 10. In the living space, a steering wheel 11 for adjusting the turning angle of the front wheels 5, various operating tools (not shown), a seat for the driver to sit on (not shown), and the like are arranged.

A front loader 20 is mounted on the front portion of the vehicle body 1. The front loader 20 mainly includes a pair of left and right main frames 100, a pair of left and right subframe units 200, a pair of left and right booms 300, and a bucket 400.

The main frame 100 is fixed to the left and right sides of the vehicle body 1 (airframe frame 2 and transmission case 4), respectively. The subframe unit 200 is detachably supported on the upper part of each main frame 100. The boom 300 is rotatably supported by each subframe unit 200. The boom 300 is arranged so as to extend from the upper part of the main frame 100 toward the lower front side. The bucket 400 is rotatably connected to the front end of the boom 300. The boom 300 can be rotated with respect to the subframe unit 200 by expanding and contracting the boom cylinder 300a. The bucket 400 can be rotated with respect to the boom 300 by expanding and contracting the bucket cylinder 400a. In this way, the earth and sand can be transported while the boom 300 and the bucket 400 are appropriately rotated.

Next, a detailed configuration of the mainframe 100 will be described with reference to FIGS. 2, 3 and 7. The pair of left and right mainframes 100 are arranged symmetrically with each other.

The main frame 100 shown in FIG. 2 supports a subframe unit 200 that supports the boom 300. In other words, the main frame 100 supports the boom 300 via the subframe unit 200. The main frame 100 mainly includes a fixed frame 110, a connecting frame 120, and a support frame 130.

The fixed frame 110 shown in FIG. 2 is a portion fixed to the vehicle body 1. The fixed frame 110 is formed in a plate shape with the plate surface oriented in the left-right direction. The fixed frame 110 is fixed to the machine frame 2 by bolts or the like.

The connecting frame 120 shown in FIG. 2 connects the fixed frame 110 and the support frame 130 described later. The connecting frame 120 is formed in a substantially cylindrical shape with the axis directed in the left-right direction. One end (left end) of the connecting frame 120 is inserted into the fixed frame 110 and appropriately fixed to the fixed frame 110 by welding.

The support frame 130 shown in FIG. 2 is a portion that supports the subframe unit 200. The support frame 130 is formed in a plate shape with the plate surface oriented in the left-right direction. The support frame 130 is arranged with the longitudinal direction facing up and down. A connecting frame 120 is inserted under the support frame 130, and the support frame 130 and the connecting frame 120 are fixed by welding. The support frame 130 is formed with a main frame side pin 131, a main frame side hook 132, and a main frame side guide surface 133.

The main frame side pin 131 shown in FIGS. 3 and 7 is a portion held by a subframe unit 200 (more specifically, a subframe side hook 222 of the guide plate 220) described later. The main frame side pin 131 is formed at the front upper end portion of the support frame 130 in a columnar shape with the axis directed in the left-right direction. The main frame side pin 131 is formed so as to project left and right from the support frame 130.

The mainframe-side hook 132 shown in FIGS. 3 and 7 is a portion that holds the subframe unit 200 (more specifically, the subframe-side pin 211 of the subframe 210) described later. The main frame side hook 132 is formed in a substantially U shape with the front open, and can support the subframe side pin 211 described later from below. The main frame side hook 132 is formed at the rear upper end portion of the support frame 130 and above the main frame side pin 131.

The main frame side guide surface 133 shown in FIGS. 3 and 7 is a subframe unit 200 (more specifically, a subframe side pin 211 of the subframe 210) when the subframe unit 200 described later is mounted on the main frame 100. ) Is for guiding to the mounting position. The main frame side guide surface 133 is formed on the upper end portion of the support frame 130 in a flat shape with the surface facing substantially upward. More specifically, the main frame side guide surface 133 is formed between the main frame side pin 131 and the main frame side hook 132 in a front-down slope shape in which the height in the vertical direction decreases toward the front. .. The main frame side guide surface 133 is not continuously formed up to the main frame side pin 131, and a recess 133a is formed between the main frame side pin 131 and the main frame side guide surface 133. By forming the recess 133a, it is possible to prevent the main frame side pin 131 from being deformed or damaged due to a contact impact during attachment / detachment.

Next, the detailed configuration of the subframe unit 200 will be described with reference to FIGS. 4 to 8. The pair of left and right subframe units 200 are formed symmetrically with each other, and in FIGS. 4 to 8 (and FIGS. 9 to 19 described later), of the pair of left and right subframe units 200. The subframe unit 200 on the right side is illustrated. In the following, unless otherwise specified, the right subframe unit 200 will be described, and the left subframe unit 200 will be omitted. Further, FIGS. 4 to 8 show a state in which the subframe unit 200 is mounted on the main frame 100 (mounted state), and the description will be described below with reference to this mounted state.

The subframe unit 200 is a portion provided between the main frame 100 and the boom 300. The subframe unit 200 rotatably supports the boom 300 above it (see FIG. 2). The subframe unit 200 includes a subframe 210, a guide plate 220, a thumb 230, a lock bar 240, a control plate 250, a detent pin 260, and an operating tool 270.

The subframe 210 is a portion constituting the right portion and the left portion of the subframe unit 200. The subframe 210 is formed in a plate shape with the plate surface oriented in the left-right direction. The subframe 210 is arranged with the longitudinal direction facing up and down. A pair of subframes 210 are provided on the left and right, and are connected to each other by appropriate members. In FIGS. 5 to 8 (and FIGS. 9 to 20 described later), the left subframe 210 is not shown for convenience of explanation. The subframe 210 is formed with a subframe side pin 211 and a regulation hole 212.

The subframe-side pins 211 shown in FIGS. 4, 5 and 7 are portions held by the mainframe-side hooks 132 (see FIG. 3) of the support frame 130. The subframe side pin 211 is formed in a columnar shape. The subframe side pin 211 is fixed to the rear lower portion of the subframe 210 with the axis oriented in the left-right direction. The subframe side pins 211 are provided so as to connect the pair of left and right subframes 210 between the pair of left and right subframes 210.

The regulation holes 212 shown in FIGS. 4 to 8 are for restricting the operating range of the operating tool 270, which will be described later. The regulation hole 212 is formed so as to penetrate the subframe 210 in the left-right direction. The regulation hole 212 is formed in a partial annular shape having a central angle of about 30 ° around the swing center (swing shaft 241) of the lock bar 240, which will be described later, in a side view. The regulation hole 212 is formed above the swing shaft 241.

The guide plate 220 shown in FIGS. 4 to 8 guides the main frame 100 to a mounting position when the subframe unit 200 is mounted on the main frame 100, and holds the main frame 100 at the mounting position. The guide plate 220 is formed in a plate shape with the plate surface oriented in the left-right direction. A pair of guide plates 220 are provided on the left and right sides. Each guide plate 220 is fixed to the inside of a pair of left and right subframes 210. In addition, in FIGS. 5 to 8 (and FIGS. 9 to 20 described later), the guide plate 220 on the left side is not shown for convenience of explanation. The guide plate 220 is formed with a subframe side guide surface 221, a subframe side hook 222, a notch 223, and an engaged hole 224.

The subframe side guide surface 221 shown in FIGS. 7 and 8 is for guiding the main frame side pin 131 to the mounting position when the subframe unit 200 is mounted on the main frame 100. The subframe side guide surface 221 is formed at the lower end portion of the guide plate 220 in a flat shape with the surface facing substantially downward. More specifically, the subframe side guide surface 221 is formed in a slope shape in which the height in the vertical direction decreases toward the front. The subframe side guide surface 221 is formed so as to be parallel to the main frame side guide surface 133. The subframe side guide surface 221 is formed so as to extend from the rear end portion of the guide plate 220 to the vicinity of the front end portion (more specifically, the subframe side hook 222 described later).

The subframe side hook 222 is a portion that holds the mainframe side pin 131 of the mainframe 100. The subframe side hook 222 is formed in the lower front portion of the guide plate 220. The subframe side hook 222 is formed in a substantially U shape with the rear side open, and can support the main frame side pin 131, which will be described later, from below. The subframe side hook 222 is connected to the front end portion of the subframe side guide surface 221.

The notch 223 shown in FIG. 8 regulates the movement of the detent pin 260, which will be described later. The notch 223 is formed so that the upper end of the guide plate 220 is open. The notch 223 is formed so as to extend downward from the upper end of the guide plate 220.

The engaged hole 224 shown in FIG. 8 regulates the swing range of the lock bar 240, which will be described later. The engaged hole 224 is formed so as to penetrate the guide plate 220 in the left-right direction. The engaged hole 224 is formed in a partial annular shape having a central angle of about 65 ° about the swing center (swing shaft 241) of the lock bar 240, which will be described later, in a side view. The engaged hole 224 is formed rearward and upward of the swing shaft 241.

The thumb 230 shown in FIGS. 4 to 8 holds the mainframe-side pin 131 immovably on the subframe-side hook 222 (to prevent the mainframe-side pin 131 from detaching from the subframe-side hook 222). It is a thing. The thumb 230 is formed in a substantially trapezoidal shape in a lateral view. The thumb 230 is provided between the pair of left and right guide plates 220. A swing shaft 231 whose axis is directed in the left-right direction is formed on the upper portion of the thumb 230. The thumb 230 is swingably supported by the subframe 210 around the axis of the swing shaft 231 above the main frame side pin 131. The thumb 230 is urged by an urging means (not shown) such as a spring in a direction in which the thumb 230 swings counterclockwise in a left side view (see FIG. 8). In addition to the swing shaft 231, the thumb 230 is formed with an engaging groove 232 and a thumb-side contact surface 233.

The engagement groove 232 shown in FIGS. 5 to 8 is a portion that engages with the mainframe side pin 131. The engaging groove 232 is formed at the lower part of the thumb 230 and at the center of the front and rear. The engaging groove 232 is formed in a semicircular shape with the lower side open in a side view. The engagement groove 232 is formed so that its diameter is substantially the same as the diameter of the main frame side pin 131 in a side view.

The thumb-side contact surface 233 shown in FIGS. 6 and 8 is a rear side surface of the thumb 230. The thumb-side contact surface 233 is formed in a flat shape with the surface facing rearward and upward, or in a curved surface shape having a radius larger than the arc of the lock bar-side contact surface 243 described later.

The lock bar 240 shown in FIGS. 5 to 8 regulates the swing of the thumb 230. The lock bar 240 is formed in a substantially pentagonal shape when viewed from the side. The right surface of the lock bar 240 is provided so as to face the left surface of the guide plate 220 on the right side. The thickness of the lock bar 240 in the left-right direction is formed to be thinner than the thickness of the thumb 230 in the left-right direction.

A swing shaft 241 whose axis is directed in the left-right direction is formed at a substantially central portion of the lock bar 240. The lock bar 240 is swingably supported by the subframe 210 around the axis of the swing shaft 241 above the rear of the thumb 230. The lock bar 240 is urged by an urging means (not shown) such as a spring in a direction in which the lock bar 240 swings counterclockwise in a left side view (see FIG. 8). The urging force in the counterclockwise direction in the left side view received by the lock bar 240 is set to be larger than the urging force in the counterclockwise direction in the left side view received by the thumb 230. In addition to the swing shaft 241, the lock bar 240 is formed with a protruding portion 242, a lock bar side contact surface 243, an insertion pin 244, and a first locked portion 245.

The protrusion 242 shown in FIGS. 6 and 8 is for pressing and swinging the control plate 250, which will be described later. The front portion of the lock bar 240 is formed to be thicker than the other portions of the lock bar 240, and the protruding portion 242 is such that a part of the thick portion protrudes toward the swing shaft 241. It is formed (see FIG. 6).

The lock bar side contact surface 243 shown in FIGS. 6 and 8 is a front side surface of the lock bar 240. The lock bar side contact surface 243 is formed in an arc shape centered on the swing shaft 241 in a side view. The lock bar side contact surface 243 is formed so as to be in contact with the thumb side contact surface 233 in the mounted state.

The insertion pin 244 shown in FIG. 8 is inserted into the engaged hole 224 of the guide plate 220. The insertion pin 244 is formed in a columnar shape protruding from the left surface of the lock bar 240 to the right. The swing range of the lock bar 240 is regulated by the insertion pin 244 and the engaged hole 224.

The first locked portion 245 shown in FIGS. 6 and 8 (b) is a portion for locking with the detent pin 260 described later. The first locked portion 245 is formed on the outer peripheral portion of the lock bar 240. The first locked portion 245 is formed so as to be located in front of the notch portion 223 in the mounted state. The first locked portion 245 is formed in a slope shape in which the outer peripheral surface of the lock bar 240 rises radially outward as the left side view clockwise direction.

The control plate 250 shown in FIGS. 5 to 8 controls the swing of the lock bar 240. The control plate 250 is formed in a substantially circular plate shape with the plate surface oriented in the left-right direction. The control plate 250 is provided so as to be swingable around the swing shaft 241 of the lock bar 240. The right surface of the control plate 250 is provided so as to face the left surface of the lock bar 240. The left surface of the control plate 250 is formed so as to be substantially flush with the left surface of the protrusion 242 of the lock bar 240. The control plate 250 is formed with a notch 251, a second locked portion 252, and a third locked portion 253.

The notch 251 shown in FIGS. 6 and 8A is a portion for allowing the control plate 250 to rotate together with the lock bar 240. The cutout portion 251 is formed so that the front end portion of the control plate 250 is opened. The cutout portion 251 is formed in an arc shape having a central angle of about 30 ° about the swing shaft 241. The notch 251 is formed so as to accommodate the protrusion 242 at a position facing the protrusion 242 of the lock bar 240.

The second locked portion 252 shown in FIGS. 6 and 8 (b) is a portion for locking with the detent pin 260 described later. The second locked portion 252 is formed on the outer peripheral portion of the control plate 250. The second locked portion 252 is formed at a position overlapping the notch portion 223 in a side view in the mounted state. The second locked portion 252 is formed in a slope shape in which the outer peripheral surface of the control plate 250 rises radially outward as it goes in the counterclockwise direction when viewed from the left side.

The third locked portion 253 shown in FIGS. 6 and 8 (b) is a portion for locking with the detent pin 260 described later. The third locked portion 253 is formed on the outer peripheral portion of the control plate 250. The third locked portion 253 is formed so as to be located in front of the notch portion 223 in the mounted state. More specifically, the third locked portion 253 is formed at a distance of about 35 ° on the clockwise side in the left side view with respect to the second locked portion 252. The third locked portion 253 is formed in a slope shape in which the outer peripheral surface of the control plate 250 rises radially outward as the left side view clockwise direction.

The detent pin 260 shown in FIGS. 6 and 8A is for restricting the swing of the lock bar 240 and the control plate 250. The detent pin 260 is formed in a columnar shape. The detent pin 260 is provided so that the left and right ends thereof are inserted into the notches 223 of each of the pair of left and right guide plates 220 with the axis oriented in the left-right direction. Further, the detent pin 260 is urged downward along the notch 223 by an urging means (not shown) such as a spring. The detent pin 260 is in contact with the outer peripheral surface of the lock bar 240 due to the urging force received by the detent pin 260 in the mounted state.

The operating tool 270 shown in FIGS. 4 and 6 is for swinging the lock bar 240 when the subframe unit 200 is removed from the main frame 100. The operating tool 270 includes a grip portion 271, an insertion pin 272, and a connection plate 273.

The grip portion 271 shown in FIG. 4 is a portion gripped by an operator. The grip portion 271 is provided on the outside of the subframe 210 (outside in the left-right direction of the vehicle body 1). The grip portion 271 is formed in an appropriate shape that is easy for the operator to grip.

The insertion pin 272 is a portion to be inserted into the regulation hole 212 of the subframe 210. The insertion pin 272 is formed in a columnar shape with the axis directed to the left and right. The insertion pin 272 is connected to the grip portion 271 via a connection plate 273 described later, and is inserted into the regulation hole 212 of the subframe 210. Therefore, the moving range of the insertion pin 272 is regulated by the regulation hole 212.

The connection plate 273 connects the grip portion 271 and the insertion pin 272 to the swing shaft 241 of the lock bar 240. The connecting plate 273 is formed in a plate shape with the plate surface oriented in the left-right direction. A grip portion 271 and an insertion pin 272 are connected to one end of the connection plate 273. On the other hand, the swing shaft 241 of the lock bar 240 is connected to the other end of the connection plate 273 so as to rotate together with the lock bar 240 within the movement range of the insertion pin 272.

Next, a method of removing the front loader 20 (more specifically, a portion of the front loader 20 excluding the main frame 100) from the vehicle body 1 will be described with reference to FIGS. 7 to 12.

7 and 8 show a state (mounted state) in which the subframe unit 200 is mounted on the main frame 100. In the mounted state, the main frame side pin 131 is held by the subframe side hook 222, and the subframe side pin 211 is held by the main frame side hook 132 (see FIG. 7).

At this time, since the lock bar 240 is urged in the counterclockwise direction when viewed from the left side, it is the most forward-lowering position (regulated position) in the movement range determined by the insertion pin 244 and the engaged hole 224. ). Then, in the lock bar 240, the lock bar side contact surface 243 comes into contact with the thumb side contact surface 233 to regulate the swing of the thumb 230 in the counterclockwise direction when viewed from the left side. As a result, the thumb 230 is held at a position (engagement position) where the engagement groove 232 engages with the main frame side pin 131, and prevents the main frame side pin 131 from being disengaged from the subframe side hook 222. .. At this time, the main frame side pin 131 is fixed at three points of the left and right subframe side hooks 222 and the engaging groove 232 located between them.

At this time, the thumb side contact surface 233 and the lock bar side contact surface 243 are formed so that the pressing force received by the lock bar 240 from the thumb 230 is directed toward the swing center (swing shaft 241) of the lock bar 240. ing. As a result, the lock bar 240 can be prevented from swinging due to the pressing force received by the lock bar 240 from the thumb 230.

In the mounted state shown in FIGS. 7 and 8, when the operating tool 270 is swung 30 ° in the left side view clockwise direction along the regulation hole 212, the lock bar 240 is moved in the left side view clockwise direction accordingly. It swings by 30 ° (in the forward rising direction) (see FIG. 9A).

When the lock bar 240 swings 30 ° clockwise in the left side view from the mounted state, the detent pin 260 is locked to the first locked portion 245 of the lock bar 240 (see FIG. 9B). Here, the urging force received by the lock bar 240 in the counterclockwise direction when viewed from the left side is set to a size such that the detent pin 260 cannot get over the first locked portion 245. Therefore, the lock bar 240 is restricted from swinging in the counterclockwise direction (forward downward direction) when viewed from the left side by the detent pin 260 and the first locked portion 245. Therefore, the lock bar 240 is held at a position (position shown in FIG. 9A) swung 30 ° clockwise from the mounted state.

At this time, the control plate 250 is restricted from swinging in the counterclockwise direction (forward downward direction) when viewed from the left side by the protruding portion 242 of the lock bar 240 (see FIG. 9A). Further, the control plate 250 is restricted from swinging in the clockwise direction (forward upward direction) when viewed from the left side by locking the detent pin 260 to the second locked portion 252 (FIG. 9 (b). )reference).

In the state shown in FIG. 9, the vehicle body 1 is retracted with the front loader 20 (the portion excluding the main frame 100) lowered to the ground. Then, the main frame 100 (main frame side pin 131) moves backward relative to the subframe unit 200 while pushing up the rear portion of the thumb 230 (see FIG. 10A). Then, the engagement between the thumb 230 and the main frame 100 (main frame side pin 131) is released. Then, the thumb 230 swings counterclockwise when viewed from the left side due to the urging force received by the thumb 230, and comes into contact with the lock bar 240.

Here, the urging force received by the thumb 230 in the counterclockwise direction (forward downward direction) is larger than the urging force received by the lock bar 240 in the counterclockwise direction (forward downward direction). Is set to. Therefore, the front portion of the lock bar 240 is pushed up by the thumb 230. As a result, the lock bar 240 begins to swing in the clockwise direction (forward upward direction) when viewed from the left side. At this time, when the notch 251 is pushed by the protruding portion 242, the control plate 250 starts to swing in the counterclockwise direction (forward upward direction) integrally with the lock bar 240.

Further, when the thumb 230 pushes up the front portion of the lock bar 240, the control plate 250 is further pressed by the protruding portion 242 of the lock bar 240 in the counterclockwise direction when viewed from the left side. Here, the difference between the urging force received by the thumb 230 in the counterclockwise direction (forward downward direction) and the urging force received by the lock bar 240 in the counterclockwise direction (forward downward direction) is The detent pin 260 is set to a size that can overcome the second locked portion 252 of the control plate 250. Therefore, when the control plate 250 is further pressed by the protruding portion 242 of the lock bar 240, the detent pin 260 gets over the second locked portion 252 (see FIG. 11B), so that the lock bar 240 and the left side It rotates together in the clockwise direction (forward upward direction) (see FIG. 11A).

Further, when the thumb 230 pushes up the front part of the lock bar 240, the lock bar 240 reaches the most forward rising position (regulation release position) in the swing range determined by the insertion pin 244 and the engaged hole 224. It swings (see FIG. 12 (a)). Specifically, the regulation release position is a position that swings 65 ° in the counterclockwise direction when viewed from the left side from the most front-down position (regulation position) shown in FIG. At this time, the lock bar 240 is restricted from swinging in the clockwise direction (forward upward direction) when viewed from the left side by the engaged hole 224. Further, the lock bar 240 is restricted from swinging in the counterclockwise direction (forward downward direction) when viewed from the left side by the pressing force of the thumb 230. The thumb 230 is held at a position (release position) in which the lock bar 240 is pushed up to the most forward raised position.

At this time, the control plate 250 rotates together with the lock bar 240 and swings from the mounted state to a position where it swings by 35 ° in the counterclockwise direction (forward upward direction). At this time, the control plate 250 is restricted from swinging in the counterclockwise direction (forward downward direction) when viewed from the left side by locking the detent pin 260 to the third locked portion 253 (FIG. 12 (FIG. 12). b) See).

In this way, with the front loader 20 (the part excluding the main frame 100) lowered to the ground, the operating tool 270 is operated to unlock the thumb 230 and the main frame side pin 131, and then the vehicle body 1 is retracted. The subframe unit 200, the boom 300, and the bucket 400 of the front loader 20 can be easily removed from the main frame 100.

Next, a method of mounting the front loader 20 (more specifically, a portion of the front loader 20 excluding the main frame 100) on the vehicle body 1 will be described with reference to FIGS. 13 to 20.

As shown in FIG. 13, with the front loader 20 (the portion excluding the main frame 100) removed from the main frame 100 and lowered to the ground, the vehicle body 1 is advanced and the main frame 100 is brought close to the subframe unit 200.

As shown in FIG. 14, when the vehicle body 1 further advances, the main frame side pin 131 comes into contact with the subframe side guide surface 221. Then, the main frame side pin 131 is guided to the sub frame side hook 222 by the sub frame side guide surface 221. Further, when the vehicle body 1 advances, the main frame side guide surface 133 comes into contact with the subframe side pin 211. Then, the subframe side pin 211 is guided to the main frame side hook 132 by the main frame side guide surface 133.

Here, since the subframe side guide surface 221 is formed in a slope shape that descends forward, the main frame side pin 131 easily comes into contact with the subframe side guide surface 221 when the vehicle body 1 is advanced. Further, even if the height of the subframe unit 200 with respect to the main frame 100 is slightly deviated, the main frame side pin 131 can be brought into contact with the subframe side guide surface 221, so that the main frame side pin 131 is on the subframe side. It can be easily guided to the hook 222.

Similarly, since the main frame side guide surface 133 is also formed in a slope shape that descends forward, the subframe side pin 211 easily comes into contact with the main frame side guide surface 133 when the vehicle body 1 is advanced. Further, even if the height of the subframe unit 200 with respect to the main frame 100 is slightly deviated, the subframe side pin 211 can be brought into contact with the main frame side guide surface 133, so that the subframe side pin 211 is on the main frame side. It can be easily guided to the hook 132.

As shown in FIG. 15, the mainframe side pin 131 comes into contact with the thumb 230 while being guided by the subframe side hook 222. Then, the mainframe side pin 131 presses the thumb 230 forward and starts swinging in the counterclockwise direction (forward upward direction) when viewed from the left side. The lock bar 240 attempts to swing in the counterclockwise direction (forward downward direction) when viewed from the left side following the thumb 230 by the urging force received by the lock bar 240.

At this time, the detent pin 260 is locked to the third locked portion 253 of the control plate 250 (see FIG. 15B). Here, in the side view, the diameter of the portion of the outer peripheral surface of the lock bar 240 adjacent to the rear end of the first locked portion 245 (distance between the axis of the swing shaft 241) is the control plate 250. Of the outer peripheral surface of the above, the diameter of the portion adjacent to the front end of the third locked portion 253 is smaller than the diameter of the portion. Therefore, the lock bar 240 does not lock the detent pin 260 with the first locked portion 245, and swings in the counterclockwise direction (forward downward direction) when viewed from the left side following the thumb 230. (See FIGS. 16 (a) and 16 (b)).

When the vehicle body 1 further advances, the thumb 230 swings further in the counterclockwise direction (forward upward direction) when viewed from the left side due to the forward pressing force of the mainframe side pin 131, and the lock bar 240 follows the thumb 230. It swings in the counterclockwise direction (forward downward direction) when viewed from the left side (see FIG. 17A). The control plate 250 is pressed by the protruding portion 242 of the lock bar 240 and tries to rotate together with the lock bar 240 in the counterclockwise direction (forward downward direction) when viewed from the left side.

Here, the urging force received by the lock bar 240 in the counterclockwise direction (forward downward direction) when viewed from the left side is set to a size that allows the detent pin 260 to get over the third locked portion 253. Therefore, when the control plate 250 is further pressed by the protruding portion 242 of the lock bar 240, the detent pin 260 gets over the third locked portion 253 (see FIG. 17B), so that the lock bar 240 and the left side It can rotate together in the counterclockwise direction (forward downward direction).

When the vehicle body 1 further advances, the thumb 230 returns to the engaging position and engages with the main frame side pin 131 (see FIG. 18). The lock bar 240 follows the thumb 230 and returns to the lowermost front lowering position (regulated position) of the lock bar 240 to regulate the swing of the thumb 230. In this way, the mainframe side pin 131 is immovably held by the thumb 230 on the subframe side hook 222. Therefore, the mainframe side pin 131 is prevented from being detached from the subframe side hook 222.

In this way, the subframe side pin 211 engages with the mainframe side hook 132, and the mainframe side pin 131 engages with the subframe side hook 222. Then, the engagement between the subframe side hook 222 and the main frame side pin 131 is held by the engagement groove 232 of the thumb 230.

In this way, with the front loader 20 (the portion excluding the main frame 100) lowered to the ground, the subframe unit 200 and the boom 300 and bucket 400 provided on the subframe unit 200 are simply advanced by simply advancing the vehicle body 1. Can be easily attached to the main frame 100. Further, as described above, the operation tool 270 is operated to release the lock by the lock bar 240, the front loader 20 (the portion excluding the main frame 100) is lowered to the ground, and the vehicle body 1 is retracted to the sub. The frame unit 200 and the boom 300 and bucket 400 provided on the subframe unit 200 can be easily removed from the main frame 100.

Therefore, when the front loader 20 is attached / detached, the conventional work such as hydraulically operating the boom 300 for alignment with the main frame 100 and inserting / removing pins for fixing the boom 300 to the main frame 100 becomes unnecessary. be able to. In addition, it is not necessary for the operator to get on and off the cabin 10 for these operations. Therefore, it is possible to reduce the work man-hours when attaching and detaching the front loader 20 and shorten the work time associated therewith.

Further, since the main frame 100 and the subframe unit 200 are configured to be aligned with each other, the main frame 100 and the subframe unit 200 can be smoothly aligned with each other.

As described above, the attachment / detachment structure of the front loader 20 according to the present embodiment includes the engagement position of the subframe 210 supporting the boom 300 with the main frame 100 provided on the vehicle body 1 and the main frame 100. A thumb 230 (engagement member) that is movably supported between the disengaged disengagement position and urged in the disengagement direction from the engagement position to the disengagement position, and the subframe. The 210 can be moved between a restricted position that restricts the thumb 230 from moving from the engaged position in the disengagement direction and a restricted release position that allows the thumb 230 to move to the disengaged position. It is provided with a supported lock bar 240 (regulatory member).
With such a configuration, it is possible to facilitate the work of attaching / detaching to / from the vehicle body 1. Specifically, the thumb 230 can be easily moved to the release position by simply moving the lock bar 240 to the release position, and the engagement between the thumb 230 and the main frame 100 can be released.

Further, the lock bar 240 is formed so as to abut on the thumb 230 located at the engaging position at the restricted position and restrict the movement of the thumb 230 in the releasing direction. ..
With this configuration, it is possible to regulate the movement of the thumb 230 in the release direction with a simple structure.

Further, the thumb 230 is formed so as to be swingably supported by the subframe 210 between the engaging position and the disengaging position.
With this configuration, the thumb 230 can be engaged with the main frame 100 and the thumb 230 can be disengaged from the main frame 100 with a simple structure.

Further, the lock bar 240 is formed on the subframe 210 so as to be swingably supported between the regulation position and the regulation release position.
With such a configuration, it is possible to restrict the movement of the thumb 230 from the engaging position in the disengaging direction and to release the restriction on the movement of the thumb 230 with a simple structure.

Further, when the main frame 100 moves relative to the subframe 210, the thumb 230 is pressed by the main frame 100 and moves from the release position to the engagement position. It is formed.
With this configuration, the thumb 230 can be easily engaged with the main frame 100 by bringing the vehicle body 1 close to the subframe 210 removed from the vehicle body 1 (main frame 100).

Further, the lock bar 240 is urged in the regulation direction from the regulation release position to the regulation position, and when the thumb 230 moves from the release position to the engagement position, the lock bar 240 follows the thumb 230. Therefore, it is formed so as to move from the regulation release position to the regulation direction.
With this configuration, when the thumb 230 returns to the engaging position and is engaged with the main frame 100, the lock bar 240 can be returned to the regulated position, and thus the lock bar 240 releases the thumb 230. Movement to can be regulated.

Further, the attachment / detachment structure of the front loader 20 according to the present embodiment includes holding mechanisms (thumb 230, lock bar 240, control plate 250 and detent pin 260) for holding the lock bar 240 at the regulation position and the regulation release position. It is equipped.
With this configuration, the thumb 230 can be held in the engaging position by holding the lock bar 240 in the regulated position. Further, by holding the lock bar 240 at the release position, the thumb 230 can be held at the release position.

Further, the attachment / detachment structure of the front loader 20 according to the present embodiment includes a holding mechanism for holding the lock bar 240 at the regulation position and the regulation release position, and the holding mechanism has the regulation position and the regulation release position. A detent mechanism (first locked portion 245 and detent pin 260) for locking the lock bar 240 so as not to move in the regulation direction is provided at an intermediate position between the lock bar 240 and the thumb 230. When the bar 240 is locked at the intermediate position by the detent mechanism and moves in the release direction, the lock bar 240 is pressed and moved to the regulation release position.
With this configuration, it is possible to prevent the thumb 230 from moving to the release position vigorously.

Further, the detent mechanism is provided on the lock bar 240 and a detent pin 260 (locking portion) urged so as to come into contact with the outer peripheral portion of the lock bar 240, and is provided by the locking portion at the intermediate position. It includes a first locked portion 245 (locked portion) to be locked.
With this configuration, the detent pin 260 is locked to the first locked portion 245, so that the lock bar 240 can be held at the intermediate position.

Further, when the lock bar 240 moves from the regulation release position toward the regulation direction, the detent pin 260 is prevented from being locked to the first locked portion 245 at the intermediate position. It includes a control plate 250 (control member).
With this configuration, when the lock bar 240 is moved from the regulated position to the regulated release position, the lock bar 240 can be held at an intermediate position, and the lock bar 240 can be moved to the regulated release position. When moving from the lock bar 240 to the regulated position, the lock bar 240 can be moved to the regulated position without being held at the intermediate position.

Further, the control plate 250 presses the detent pin 260 against the urging force received by the detent pin 260 at the intermediate position, so that the detent pin 260 engages with the first locked portion 245. It is formed to avoid being stopped.
With this configuration, when the lock bar 240 is moved from the regulation release position to the regulation position with a simple structure, the lock bar 240 is moved to the regulation position without being held at the intermediate position. Can be made to.

Further, the lock bar 240 is formed so that the pressing force received from the thumb 230 located at the engaging position at the restricted position is directed toward the swing center of the lock bar 240.
With this configuration, it is possible to prevent the lock bar 240 from swinging due to the pressing force received from the thumb 230 when the lock bar 240 regulates the swing of the engaging member. ..

Further, the attachment / detachment structure of the front loader 20 according to the present embodiment includes an operation tool 270 for moving the lock bar 240.
With this configuration, the lock bar 240 can be easily moved by using the operating tool 270.

Further, the attachment / detachment structure of the front loader 20 according to the present embodiment can be attached / detached to / from the main frame side pin 131 (first held portion) provided in the main frame 100 provided in the vehicle body 1 and the main frame 100. A subframe side pin 211 (second held portion) provided on the subframe 210 that supports the boom 300, and a subframe side hook 222 provided on the subframe 210 that holds the mainframe side pin 131. The (first holding portion), the main frame side hook 132 (second holding portion) provided on the main frame 100 and holding the sub frame side pin 211, and the sub frame 210 are mounted on the main frame 100. When mounted, the subframe side guide surface 221 (first guide portion) that guides the mainframe side pin 131 to the subframe side hook 222 and the subframe side pin 211 when mounted are the mainframe. It is provided with a main frame side guide surface 133 (second guide portion) for guiding to the side hook 132.
With such a configuration, it is possible to facilitate the work of attaching / detaching to / from the vehicle body 1. Specifically, when mounted on the vehicle body 1, it is possible to easily align the main frame 100 and the subframe 210. Further, since the main frame 100 and the subframe 210 align with each other, it is possible to facilitate the alignment between the main frame 100 and the subframe 210.

Further, each of the subframe side hook 222 and the mainframe side hook 132 is formed so as to support each of the mainframe side pin 131 and the subframe side pin 211 from below.
With this configuration, the subframe 210 can be supported from below by the mainframe 100.

Further, the subframe side guide surface 221 is provided on the subframe 210, and the mainframe side pin 131 (mainframe side held portion) is attached to the subframe side hook 222 (subframe side holding portion) at the time of mounting. The main frame side guide surface 133 is provided on the main frame 100, and the sub frame side pin 211 (subframe side cover) is provided at the time of mounting. The unit) is guided to the main frame side hook 132 (main frame side holding unit) (main frame side guide unit).
With this configuration, the main frame 100 and the subframe 210 are aligned with each other, so that the main frame 100 and the subframe 210 can be easily aligned with each other.

Further, the main frame side guide surface 133 is formed so as to guide the subframe side pin 211 to the main frame side hook 132 while supporting the subframe side pin 211 from below at the time of mounting.
With this configuration, when mounted on the vehicle body 1, the main frame 100 and the subframe 210 can be aligned while supporting the subframe 210 from below, thus improving workability. Can be done.

Further, the subframe side guide surface 221 is formed so as to guide the mainframe side pin 131 to the subframe side hook 222 while being supported from below by the mainframe side pin 131 at the time of mounting. Is what you are doing.
With this configuration, when mounted on the vehicle body 1, the main frame 100 and the subframe 210 can be aligned while supporting the subframe 210 from below, thus improving workability. Can be done.

Further, each of the main frame side guide surface 133 and the subframe side guide surface 221 is formed in a slope shape in which the height in the vertical direction decreases toward the front direction of the vehicle body 1.
With this configuration, when the vehicle body 1 is mounted on the vehicle body 1, when the vehicle body 1 is advanced to bring the main frame 100 closer to the sub frame 210, each held portion (main frame side pin 131 and sub frame) is held. The side pin 211) is likely to come into contact with each guide portion (subframe side guide surface 221 and main frame side guide surface 133). Therefore, each held portion can be easily guided to each holding portion (subframe side hook 222 and main frame side hook 132).

Further, the main frame 100 includes a recess 133a formed between the main frame side guide surface 133 and the main frame side pin 131.
With such a configuration, it is possible to prevent the main frame side pin 131 from being deformed or damaged due to a contact impact or the like when it is attached to or detached from the vehicle body 1.

Further, the attachment / detachment structure of the front loader 20 according to the present embodiment is provided on the subframe 210, and when the mainframe side pin 131 is guided to the subframe side hook 222 by the subframe side guide surface 221. It is provided with a thumb 230 (engagement member) that engages with the mainframe side pin 131 and prevents the mainframe side pin 131 from being disengaged from the subframe side hook 222.
With this configuration, it is possible to prevent the mainframe side pin 131 from being detached from the subframe side hook 222.

Further, the front loader 20 according to the present embodiment has a detachable structure according to the present embodiment.
With such a configuration, it is possible to provide a front loader 20 capable of facilitating the work of attaching / detaching to / from the vehicle body 1.

Further, the tractor (working vehicle) according to the present embodiment includes a front loader 20.
With such a configuration, it is possible to provide a tractor work vehicle capable of facilitating the work of attaching and detaching the front loader 20 to the vehicle body 1.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above configuration, and various modifications can be made within the scope of the invention described in the claims.

For example, in the present embodiment, the thumb 230 engages with and disengages the mainframe side pin 131 by swinging, but the mode of movement of the thumb 230 is limited to swinging. It may be performed by sliding with respect to the subframe 210, for example.

Further, in the present embodiment, the lock bar 240 regulates the swing of the thumb 230 and releases the regulation by swinging, but the mode of movement of the lock bar 240 is limited to swinging. It may be performed by sliding with respect to the subframe 210, for example.

Further, in the present embodiment, the structure is such that the thumb 230 is provided inside (between) the two guide plates 220, but the structure is not limited to this, and for example, one guide plate 220 may be used. , The thumb 230 may be provided on the outside of the guide plate 220. However, in terms of the stability of the support of the subframe unit 200 with respect to the main frame 100, the thumb 230 is provided inside (between) the guide plates 220 provided on the pair of left and right subframes 210 as in the present embodiment. The structure provided is preferable.

Further, in the present embodiment, the lock bar 240 is provided inside the two guide plates 220 at substantially the same position as the thumb 230 in the left-right direction, but the present invention is not limited to this, and for example, the thumb 230. The lock bar 240 may be provided at different positions in the left-right direction (for example, the thumb 230 is pressed from the left-right direction to regulate the swing). However, in terms of ease of regulation of the swing of the thumb 230, as in the present embodiment, inside the guide plates 220 provided on the pair of left and right subframes 210, the thumb 230 and the left and right directions are generally. A structure in which the lock bar 240 is provided at the same position (on the same plane) is preferable.

Further, in the present embodiment, the control plate 250 swings around the same axis as the lock bar 240 (swing shaft 241), but a swing shaft may be separately provided for the control plate 250. However, in terms of ease of controlling the swing of the lock bar 240 and reduction of the number of parts, the control plate 250 may swing coaxially with the lock bar 240 as in the present embodiment. preferable.

Further, in the present embodiment, the control plate 250 is provided on one side of the lock bar 240, but may be provided on both the left and right sides of the lock bar 240.

Further, in the present embodiment, each held portion (main frame side pin 131 and sub frame side pin 211) is provided on different members (main frame 100 and sub frame 210), but the same member. It may be provided. Each holding portion (subframe side hook 222 and main frame side hook 132) may also be provided on the same member. For example, each held portion (pin) may be provided on the main frame 100 side, and each holding portion (hook) may be provided on the sub frame 210 side. Alternatively, each held portion (pin) may be provided on the subframe 210 side, and each holding portion (hook) may be provided on the main frame 100 side.

Further, in the present embodiment, the thumb-side contact surface 233 is formed to be flat, but as shown in FIG. 19, the radius of curvature is the radius of curvature of the lock bar-side contact surface 243 in the side view. It may be formed in an arc shape substantially the same as the above. As a result, the lock bar 240 can be swung in the forward upward direction without being hindered by the thumb 230, and the contact area between the thumb side contact surface 233 and the lock bar side contact surface 243 in the mounted state can be increased. Since the number can be increased, it is possible to easily regulate the swing of the thumb 230.

As described above, in the attachment / detachment structure of the front loader 20 according to the present embodiment, the thumb 230 is formed so as to be swingably supported by the subframe 210 between the engagement position and the release position. The lock bar 240 is formed so as to be swingably supported by the subframe 210 between the regulation position and the regulation release position, and the swing shaft 231 of the thumb 230. Is provided so as to be parallel to the swing shaft 241 of the lock bar 240, and the lock bar side contact surface 243 (the contact portion of the lock bar 240 with the thumb 230) is the swing of the lock bar 240. In the direction of the moving axis, the lock bar 240 is formed in an arc shape centered on the swing shaft 241, and the thumb-side contact surface 233 (the contact portion of the thumb 230 with the lock bar 240) is formed. In the direction of the swing axis of the thumb 230, the radius of curvature is formed in an arc shape substantially the same as the radius of curvature of the lock bar side contact surface 243.
With this configuration, the lock bar 240 can be swung without being hindered by the thumb 230.

1 Body 20 Front loader 100 Main frame 131 Main frame side pin 132 Main frame side hook 133 Main frame side guide surface 133a Recess 210 Subframe 211 Subframe side pin 221 Subframe side guide surface 222 Subframe side hook 230 Thumb 240 Lock bar 245 First locked part 250 Control plate 260 Detent pin 270 Operation tool 300 Boom

Claims (16)

The subframe that supports the boom is movably supported between the engaging position that engages with the main frame provided on the vehicle body and the disengaging position that is disengaged from the main frame. An engaging member urged in the disengaging direction from the engaging position toward the disengaging position,
Between the restricted position that restricts the engaging member from moving in the disengaging direction from the engaging position and the restricted releasing position that allows the engaging member to move to the disengaging position on the subframe. With regulatory members that are movably supported by
A holding mechanism that holds the restricting member at the restricted position and the restricted release position,
Equipped with
The regulatory member
It is urged in the regulation direction from the regulation release position to the regulation position.
When the engaging member moves from the disengaging position to the engaging position, it is formed so as to follow the engaging member and move from the regulation releasing position to the regulation direction.
The holding mechanism is
A detent mechanism for locking the regulation member so as not to move in the regulation direction is provided at an intermediate position between the regulation position and the regulation release position.
The engaging member is
When the regulation member is locked at the intermediate position by the detent mechanism and moves in the release direction, the regulation member is pressed and moved to the regulation release position.
Front loader attachment / detachment structure. The regulatory member
At the restricted position, the engaging member is in contact with the engaging member located at the engaging position to restrict the movement of the engaging member in the disengaging direction.
The attachment / detachment structure of the front loader according to claim 1. The engaging member is
The subframe is formed so as to be swingably supported between the engaging position and the disengaging position.
The attachment / detachment structure of the front loader according to claim 1 or 2. The regulatory member
The subframe is formed so as to be swingably supported between the regulation position and the regulation release position.
The front loader attachment / detachment structure according to any one of claims 1 to 3. The engaging member is
When the main frame moves relative to the subframe , it is formed so as to move from the release position to the engagement position by the pressing force of the main frame.
The front loader attachment / detachment structure according to any one of claims 1 to 4. A holding mechanism for holding the regulation member at the regulation position and the regulation release position is provided.
The front loader attachment / detachment structure according to any one of claims 1 to 5. The detent mechanism
A locking portion urged to abut the outer peripheral portion of the regulating member and
A locked portion provided on the regulating member and locked by the locking portion at the intermediate position,
Equipped with
The front loader attachment / detachment structure according to any one of claims 1 to 6. A control member is provided which prevents the locking portion from being locked to the locked portion at the intermediate position when the regulating member moves from the regulation release position toward the regulation direction.
The attachment / detachment structure of the front loader according to claim 7 . The control member
At the intermediate position, the locking portion is formed so as to avoid being locked to the locked portion by pressing the locking portion against the urging force received by the locking portion. ing,
The attachment / detachment structure of the front loader according to claim 8 . The engaging member is
The subframe is formed so as to be swingably supported between the engaging position and the disengaging position.
The regulatory member
The subframe is formed so as to be swingably supported between the regulation position and the regulation release position.
The swing shaft of the engaging member is
It is provided so as to be parallel to the swing axis of the regulating member.
The contact portion of the regulating member with the engaging member is
In the direction of the swing axis of the regulating member, it is formed in an arc shape centered on the swing axis of the regulating member.
The contact portion of the engaging member with the regulating member is
In the direction of the swing axis of the engaging member, the radius of curvature is formed in an arc shape substantially the same as the radius of curvature of the contact portion of the regulating member with the engaging member.
The front loader attachment / detachment structure according to any one of claims 1 to 9 . The subframe that supports the boom is movably supported between the engaging position that engages with the main frame provided on the vehicle body and the disengaging position that is disengaged from the main frame. An engaging member urged in the disengaging direction from the engaging position toward the disengaging position,
Between the restricted position that restricts the engaging member from moving in the disengaging direction from the engaging position and the restricted releasing position that allows the engaging member to move to the disengaging position on the subframe. With regulatory members that are movably supported by
Equipped with
The engaging member is
The subframe is formed so as to be swingably supported between the engaging position and the disengaging position.
The regulatory member
The subframe is formed so as to be swingably supported between the regulation position and the regulation release position.
The swing shaft of the engaging member is
It is provided so as to be parallel to the swing axis of the regulating member.
The contact portion of the regulating member with the engaging member is
In the direction of the swing axis of the regulating member, it is formed in an arc shape centered on the swing axis of the regulating member.
The contact portion of the engaging member with the regulating member is
In the direction of the swing axis of the engaging member, the radius of curvature is formed in an arc shape substantially the same as the radius of curvature of the contact portion of the regulating member with the engaging member.
Front loader attachment / detachment structure. The regulatory member
At the regulation position, the pressing force received from the engagement member located at the engagement position is formed so as to be directed toward the swing center of the regulation member.
The attachment / detachment structure of the front loader according to claim 10 or 11 . The subframe that supports the boom is movably supported between the engaging position that engages with the main frame provided on the vehicle body and the disengaging position that is disengaged from the main frame. An engaging member urged in the disengaging direction from the engaging position toward the disengaging position,
Between the restricted position that restricts the engaging member from moving in the disengaging direction from the engaging position and the restricted releasing position that allows the engaging member to move to the disengaging position on the subframe. With regulatory members that are movably supported by
Equipped with
The engaging member is
When the main frame moves relative to the subframe, it is formed so as to move from the release position to the engagement position by the pressing force of the main frame.
Front loader attachment / detachment structure. An operation tool for moving the regulation member is provided.
The front loader attachment / detachment structure according to any one of claims 1 to 13. A front loader having the detachable structure according to any one of claims 1 to 14. A work vehicle comprising the front loader according to claim 15.

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