JP6847014B2 - Harvester - Google Patents

Description

The present invention relates to a harvester provided in a machine body so that the driving unit can freely change its posture between a normal posture during traveling and a maintenance posture away from the normal posture.

In a harvester such as a combine, as disclosed in Patent Document 1, a parking brake for braking a traveling device is provided in the main body of the machine, and a brake pedal provided in the driving unit and a parking brake are mechanically linked by a link mechanism. Some are connected. As a result, the parking brake can be operated to the braking side by depressing the brake pedal.

Japanese Unexamined Patent Publication No. 2012-61977

In a harvester equipped with a driving unit that can freely change its posture to a normal posture and a maintenance posture, as in Patent Document 1, when a parking brake is provided on the main body of the machine and a brake operating tool is provided on the driving unit, the brake operating tool is used. The link mechanism that connects to the parking brake must be equipped with an appropriate structure that can handle changes in the attitude of the driver.

INDUSTRIAL APPLICABILITY In a harvester equipped with a driver unit that can freely change its posture between a normal posture and a maintenance posture, the present invention supports a change in the posture of the driver unit by providing a link mechanism that connects the brake operating tool of the driver unit and the parking brake of the machine body. The purpose is to obtain an appropriate structure.

The feature of the present invention is
The operation unit is configured as follows in a harvester supported by the machine body in a state in which the posture can be freely changed between a normal posture during running and a maintenance posture away from the normal posture.
A parking brake that is supported by the main body of the aircraft and brakes the traveling device,
A brake operating tool provided in the driving unit to operate the parking brake,
A link mechanism for linking the brake operating tool and the parking brake is provided.
The link mechanism is provided so that the operation tool side portion on the brake operation tool side and the brake side portion on the parking brake side can be separated.
When the driving unit is changed from the normal posture to the maintenance posture side, the operating tool side portion and the brake side portion are separated so that the linkage between the brake operating tool and the parking brake is released. Configured
A first member is provided on one of the operating tool side portion and the brake side portion, and a second member is provided on the other side of the operating tool side portion and the brake side portion.
When the brake operating tool is operated to the braking side when the driving unit is in the normal posture, the parking brake is operated to the braking side by the contact pressing action between the first member and the second member.
The first member is provided at one of the operating tool side portion and the brake side portion at the end portion on the second member side.

According to the present invention, when the brake operating tool is operated to the braking side while the driving unit is in the normal posture, the operating tool side portion and the brake side portion are brought into contact with each other by the contact pressing between the first member and the second member. Linked, the operating force of the brake operating tool is transmitted to the parking brake via the operating tool side portion and the brake side portion, and the parking brake is operated to the braking side.

When the driving unit is changed to the maintenance posture, the operating tool side portion and the brake side portion are separated from each other, and the link between the brake operating tool and the parking brake is released.

For example, the connecting pin and the pin hole are separately provided on the operating tool side portion and the brake side portion, and the connecting pin and the pin are linked so that the operating tool side portion and the brake side portion are linked by the engagement of the connecting pin and the pin hole. It is conceivable that the connection between the operating tool side portion and the brake side portion is released by disengaging the holes. In this case, if the play of the brake operating tool when the parking brake is turned on and operated is reduced, it is necessary to reduce the engagement flexibility between the connecting pin and the pin hole. Therefore, when the driving unit is changed to the normal posture, the connecting pin and the pin The holes are difficult to engage. If the connecting pin and the pin hole are made easy to engage with each other, it is necessary to increase the engagement flexibility between the connecting pin and the pin hole, so that the play of the brake operating tool increases.

According to the present invention, since the operating tool side portion and the brake side portion are linked by the contact pressing between the first member and the second member, the operating tool side portion and the brake side portion are linked in a state where there is little coordination flexibility. Even so, when the operating unit is changed to the normal posture, the alignment between the first member and the second member is more likely to appear than the alignment between the connecting pin and the pin hole. That is, the parking brake can be operated in a state in which the parking brake responds responsively to the operation of the brake operating tool while eliminating the need to release or return the link between the operating tool side portion and the brake side portion.

As described above, according to the present invention, in a harvester equipped with a driving unit that can freely change its posture to a normal posture and a maintenance posture, the link mechanism that connects the brake operating tool of the driving unit and the parking brake of the machine body is operated. It is possible to obtain an appropriate structure corresponding to the change in the posture of the part.

In the present invention
One of the first member and the second member is composed of a surface member, and the other of the first member and the second member is composed of a moving member that can move on the surface member.
When the brake operating tool is operated to the braking side when the driving unit is in the normal posture, the moving member moves on the surface member, and the parking brake is operated to the braking side.
It is preferable that the direction of initial movement of the driving unit when the driving unit starts to be changed from the normal posture to the maintenance posture side and the moving direction of the moving member intersect with each other.

According to the present invention, when the brake operating tool is operated to the braking side, the moving member moves on the surface member, so that the difference between the operating locus of the brake operating tool and the operating locus of the operating portion of the parking brake is reasonable. While being absorbed, the operation of the brake operating tool on the braking side is transmitted to the parking brake via the operating tool side portion, the moving member and the surface member, and the brake side portion, and the parking brake is operated on the braking side.

According to the present invention, the direction of initial movement of the driving unit when the driving unit starts to change from the normal posture to the maintenance posture side is set so as to intersect the moving direction of the moving member, and the driving unit is in the maintenance posture. When changed to, the moving member and the surface member are separated from each other in the direction of the initial movement of the driving unit.
As a result, when the operating unit is changed to the maintenance posture, the moving member and the surface member can be separated without affecting each other, and the moving member and the surface member are linked when they are separated from each other. The mechanism will not be damaged.

According to the present invention, the driving unit can be changed to the maintenance posture without damaging the link mechanism connecting the brake operating tool and the parking brake, thereby improving the maintainability of the harvester. Can be done.

In the present invention
It is preferable that the direction of initial movement of the driving unit and the direction of movement are orthogonal to each other.

According to the present invention, the driving unit is changed to the maintenance posture by orthogonalizing the direction of the initial movement of the driving unit when the driving unit starts to change from the normal posture to the maintenance posture side and the moving direction of the moving member. At that time, the moving member and the surface member can be separated without further affecting each other, and the link mechanism is further less likely to be damaged when the moving member and the surface member are separated from each other.

In the present invention
The brake operating tool can swing around the first axis in the left-right direction of the machine body located on the rear side of the operating portion of the brake operating tool.
The operating tool side portion is formed in an arc shape that is arranged in front of the first shaft core and bulges toward the front side of the machine body, and is moved up and down around the first shaft core by operating the brake operating tool. Equipped with a swinging arm member,
A through hole through which the arm member is passed is formed on the floor of the driving unit, and the arm member is inserted through the through hole.
It is preferable that the first member is provided at the lower end of the arm member.

According to the present invention, since the arc-shaped arm member passes through the through hole, the size of the through hole in the front-rear direction can be reduced as compared with the case where the linear arm member is adopted. Further, since the operating force transmitted from the brake operating tool to the arm member can be efficiently transmitted to the brake side portion, the parking brake can be lightly operated to the braking side.

In the present invention
The brake side portion is provided with a swing member capable of swinging around the second shaft core in the left-right direction of the machine body.
A portion of the swing member above the second shaft core is provided with one of the first member and the second member, and a portion below the second shaft core of the swing member. It is preferable that the parking brake is provided with an action unit linked to the parking brake.

According to the present invention, in order to employ a swinging member having one of a first member and a second member in a portion on the front side of the second shaft core and a working portion on a portion on the rear side of the second shaft core. In comparison, the front-rear direction space required for installing the swing member can be reduced to a small space, and the link between the force point side and the action point side of the swing member can be set appropriately, and the action part can be used to operate the parking brake. The required stroke can be activated to ensure that the parking brake is in the braking state.

In the present invention
The moving member is preferably a roller member that rotates around an axis that intersects the moving direction.

According to the present invention, when the brake operating tool is operated to the braking side while the driving unit is in the normal posture, the roller member is in a state of rolling on the surface member. Therefore, the operation locus of the brake operating tool and the parking brake The difference from the operation locus of the operation unit is absorbed more reasonably and smoothly.

In the present invention
A holding mechanism provided on the main body of the machine to hold the brake operating tool in the braking operation state is provided.
A holding member that engages with the brake operating tool or a portion on the operating tool side to hold the brake operating tool in the braking operation state, and an urging member that urges the holding member to the engaging side. And are prepared,
It is preferable that the disengagement operating tool for operating the holding member on the disengaging side is supported by the brake operating tool or the operating tool side portion.

When the harvester is provided with a parking brake and a brake operating tool, it may be provided with a holding mechanism for holding the brake operating tool in the braking operation state.
When the main body of the machine is equipped with a parking brake and the driver is equipped with a brake operating tool, and the driver is configured to freely change the posture to the normal posture and the maintenance posture, the above-mentioned holding mechanism is provided in the driver as follows. May be shown.

For example, if the driver is changed to the maintenance posture while the brake operator is held in the braking operation state, the brake operator and the holding mechanism are provided in the driver, so that the brake operator is provided by the holding mechanism. It is maintained in the braking operation state. On the other hand, the parking brake provided in the main body of the machine is operated to the release side by releasing the cooperation with the brake operating tool.

When the driving unit is then changed to the normal posture in the above-mentioned state, the brake operating tool held in the braking operation state and the parking brake operated on the release side are returned to the linked state.
In this case, the states of the moving member and the surface member are different from each other due to the difference between the braking side and the release side, and the moving member and the surface member are well linked, that is, the moving member can move on the surface member. It may not return.

On the other hand, in the present invention, the holding mechanism is provided in the main body of the machine body.
In the present invention, as described above, when the driving unit is changed to the maintenance posture while the brake operating tool is held in the braking operating state, the brake operating tool provided in the driving unit and the holding mechanism provided in the machine body are used. The brake operating tool is operated to the release side when the brake is released, and the parking brake provided on the main body of the aircraft is also operated to the release side by releasing the linkage with the brake operating tool.

According to the present invention, when the driving unit is then changed to the normal posture in the above-mentioned state, the brake operating tool operated on the release side and the parking brake operated on the release side are returned to the linked state. ..
In this case, since the brake operating tool and the parking brake are operated on the same release side, the moving member and the surface member are in the same release side state, and the moving member and the surface member are in a linked state, that is, the moving member is a surface. It is possible to return to a state where it can move on the member without difficulty.

According to the present invention, in a state where the brake operating tool is held in the braking operation state, the holding member of the holding mechanism can be operated to the disengagement side by the release operating tool to operate the holding mechanism in the disengaged state. Yes, the brake operating tool can be operated to the release side.
In this case, since the release operation tool is supported by the brake operation tool or the operation tool side portion of the link mechanism, the release operation tool is placed close to the brake operation tool, and the release operation tool can be easily operated. Can be operated.

It is an overall side view of a combine. It is an overall plan view of the combine in a state where the operation part and the grain tank are changed to the maintenance posture. It is a perspective view which shows the brake pedal, the swing member, the holding mechanism and the neutral operation mechanism. It is a side view which shows the brake pedal and the swing member in the state which the brake pedal is operated in the release position. It is a side view which shows the brake pedal and the swing member in the state which the brake pedal is operated to the braking position. It is a front view which shows the input pin member at the action position. It is a front view which shows the input pin member in the retracted position. It is a side view which shows the holding mechanism in a state where a brake pedal is operated to a braking position. It is a side view which shows the holding mechanism in the state which the brake pedal is operated in the release position. It is a side view which shows the neutral operation mechanism. FIG. 5 is an overall plan view of a combine harvester having another implementation structure in a state where the operation unit and the grain tank are changed to the maintenance posture. It is a perspective view of the vicinity of a brake pedal, a linking arm, a holding mechanism, a shift lever, and a neutral operation mechanism in a state where the brake pedal is stepped on to a braking position in a combine having another implementation structure. It is a side view of the vicinity of a brake pedal, a linking arm, a holding mechanism, a parking brake, a shift lever, and a neutral operation mechanism in a combine having another implementation structure in a state where the brake pedal is operated to a release position. It is a side view of the vicinity of a brake pedal, a linking arm, a holding mechanism, a parking brake, a shift lever, and a neutral operation mechanism in a state where the brake pedal is stepped on to a braking position in a combine having another implementation structure. In a combine harvester having another implementation structure, the brake pedal, the linking arm, the holding mechanism, the parking brake, the shift lever, and the neutral operation mechanism when the release operation tool is stepped on while the brake pedal is stepped on to the braking position. It is a side view in the vicinity of.

Unless otherwise specified, the front-rear direction and the left-right direction in the embodiment of the present invention are described as follows. The direction of travel on the forward side during work travel is "forward", and the direction of travel on the reverse side is "rear". The direction corresponding to the right side is "right" and the direction corresponding to the left side is "left" with respect to the forward posture in the front-back direction.

(Overall composition of combine harvester)
FIGS. 1 and 2 show a self-removing combine harvester for rice, which is an example of a harvester, and the body 1 is supported by the crawler-type traveling devices 2 on the right and left. The cutting section 3 is supported by the front portion of the machine body 1, and the driving section 4 covered with a cabin is supported by the right portion of the front portion of the machine body 1. The threshing device 5 and the waste straw shredding device 6 are supported on the left side of the rear part of the machine body 1, and the grain tank 7 and the grain discharging device 8 are supported on the right part of the rear part of the machine body 1.

With the above structure, as shown in FIGS. 1 and 2, the grain culms in the field are cut by the cutting unit 3, and the stock of the cut culms is delivered to the feed chain 9 provided in the threshing device 5. The culm is transported to the rear side, and the tip of the culm is threshed by the threshing device 5. The grains that have been threshed and collected by the threshing device 5 are supplied to the grain tank 7, and the waste straw that has been threshed is supplied to the waste straw shredding device 6 and shredded and released to the field.

As shown in FIGS. 1 and 2, the grain discharging device 8 discharges the grains of the grain tank 7 to an external carrier or the like, and is around the vertical vertical axis core P1 at the rear of the machine body 1. It is supported so that it can turn freely.

As shown in FIGS. 1 and 2, the Glen tank 7 is supported by the machine body 1 so as to be able to freely change the posture around the vertical axis core P1 in the normal posture B1 during running and the maintenance posture B2 away from the normal posture B1. Has been done. By changing the grain tank 7 to the maintenance posture B2, it is possible to perform maintenance work on the back side of the threshing device 5 and the grain tank 7.

As shown in FIGS. 1 and 2, an engine 11, a diesel particulate filter 39, and accessories are supported under the driver's seat 10 provided in the driver's unit 4. Around the vertical vertical axis core P2 on the left side of the rear part of the driving unit 4, the driving unit 4 can freely change its posture between the normal posture A1 during running and the maintenance posture A2 away from the normal posture A1. It is supported by 1.

With the above structure, as shown in FIG. 2, after changing the Glen tank 7 to the maintenance posture B2, the operation unit 4 can be changed to the maintenance posture A2. By changing the operation unit 4 to the maintenance posture A2, maintenance work such as the engine 11 and the diesel particulate filter 39 can be performed.

(Outline of the relationship between the parking brake, brake pedal and shift lever)
A mission case (not shown) is supported by the airframe body 1, and a hydrostatic continuously variable transmission (not shown) is connected to the mission case. The power of the engine 11 is transmitted to the hydrostatic continuously variable transmission, and is transmitted from the hydrostatic continuously variable transmission to the traveling device 2, the threshing device 5, and the like via a transmission device (not shown) inside the mission case. Be transmitted.

A parking brake 22 for braking the traveling device 2 is provided in the mission case. As shown in FIG. 2, a brake pedal 12 for operating the parking brake 22 on the braking side is provided in the driving unit 4, and a speed change lever 23 for operating the hydrostatic continuously variable transmission is provided in the driving unit 4. As shown in FIG. 3, a neutral operation mechanism 37A is provided over the brake pedal 12 and the shift lever 23.

As a result, when the brake pedal 12 is stepped on to the braking position, the parking brake 22 is operated to the braking side, and at the same time, the hydrostatic continuously variable transmission is forcibly operated to the neutral position N.
The structure of the brake pedal 12, the parking brake 22, and the like and the operating state of each part will be described below.

(Brake pedal structure)
As shown in FIG. 2, a brake pedal 12 (corresponding to a brake operating tool) is provided at the lower left portion of the driving unit 4. As shown in FIGS. 3 and 4, the brake pedal 12 is provided above the floor portion 14 of the driving portion 4.

As shown in FIGS. 3 and 4, the brake pedal 12 includes an L-shaped arm portion 12a and a step portion 12b (corresponding to an operation portion) in a side view. The rear end portion of the arm portion 12a is supported by the side panel support 51 via the support shaft 50. The side panel column 51 is erected on the driving unit frame 52 and supports the side panel 29 (see FIGS. 1 and 2). The driving unit frame 52 constitutes a driving unit 4 whose posture can be changed between the normal posture A1 and the maintenance posture A2, and is supported by the machine body 1 in a state where it can swing around the vertical axis core P2. The brake pedal 12 is swingably supported around the first axis X in the left-right direction of the body of the support shaft 50 located on the rear side of the step portion 12b. The spring 54 is connected to the spring hooking member 53 extending from the arm portion 12a and the spring hooking portion 51a of the side panel column 51. The brake pedal 12 is urged by a spring 54 at the release position shown in FIG. As shown in FIG. 9, when the brake pedal 12 is operated to the release position, the end portion 12d of the contact portion 12c provided on the arm portion 12a comes into contact with the sensor support member 55, and the brake pedal 12 is brought into contact with the sensor support member 55 by the contact portion 12c. It is positioned at the release position. The sensor support member 55 is supported by the side panel support 51.

As shown in FIG. 9, the contact type brake sensor 15 is supported by the sensor support member 55. When the brake pedal 12 is operated to the release position, the contact portion 12c comes into contact with the brake sensor 15. The brake sensor 15 detects that the brake pedal 12 is operated to the release position.

(Linked structure of brake pedal and parking brake)
As shown in FIGS. 3 and 4, the arm member 56 extends downward from the arm portion 12a. The arm member 56 is arranged in front of the first axis X and is formed in an arc shape that bulges toward the front side of the machine body. A through hole 57 through which the arm member 56 penetrates is formed in the floor portion 14. When the brake pedal 12 is operated, the arm member 56 swings up and down around the first axis X in a state where the through hole 57 is inserted. A sealing material 58 is attached to the through hole 57. The gap between the floor portion 14 and the arm member 56 is closed by the sealing material 58, and sand dust and the like are prevented from entering the operating portion 4 from below the floor portion 14 through the through hole 57. In the present embodiment, the arm member 56 and the brake pedal 12 are directly connected to each other, but depending on the position of the arm member 56 and the brake pedal 12 being displaced in the left-right direction of the machine body, the arm member 56 and the brake pedal 12 are connected. An interlocking configuration may be adopted in which and are interlocked and connected via a relay member.

As shown in FIGS. 3 and 4, below the floor portion 14, the swing member 59 is supported by the support member 61 via the support shaft 60. The support member 61 is supported by the machine body 1 via the support frame 62. The swing member 59 is supported by the machine body 1 in a state in which the support shaft 60 can swing around the second shaft core Y in the left-right direction of the machine body. A positioning portion 59a is provided on a portion of the swinging member 59 on the front side of the support shaft 60. The swing member 59 is swing-biased by a spring 64 at a standby position where the positioning portion 59a abuts on the upper portion of the support member 61.

An input pin member 65 is provided on a portion of the swing member 59 above the second shaft core Y. An output pin member 66 is provided in a portion of the swing member 59 below the second shaft core Y. The operation cable 67 is connected to the output pin member 66 and the operation unit 22a of the parking brake 22, and the output pin member 66 is linked to the parking brake 22 via the operation cable 67.

As shown in FIG. 6, the input pin member 65 is slidably supported by the swing member 59 and the guide portion 59b included in the swing member 59 in the left-right direction of the machine body, and switches between the action position and the retracted position. It is possible. As shown in FIG. 6, when the input pin member 65 is located at the working position, the passive portion 65a on one end side of the input pin member 65 projects long from the guide portion 59b to the side where the arm member 56 is located, and the brake pedal 12 brakes. When operated sideways, the lower end surface 56a of the arm member 56 comes into contact with the passive portion 65a. As shown in FIG. 7, when the input pin member 65 is positioned at the retracted position, the passive portion 65a on one end side of the input pin member 65 is retracted toward the guide portion 59b as compared with the case where the input pin member 65 is located at the working position. To do. A positioning pin 68 and a spring 69 are mounted on the input pin member 65 between the swing member 59 and the guide portion 59b. The input pin member 65 is positioned at the working position when the positioning pin 68 comes into contact with the guide portion 59b. The input pin member 65 is slidly urged to the action position by the spring 69.

With the above structure, as shown in FIGS. 3 and 4, a link mechanism 21A that links the brake pedal 12 and the parking brake 22 is connected to the brake pedal 12 and the parking brake 22. The link mechanism 21A includes an arm member 56, a swing member 59, and an operation cable 67.

In this case, as shown in FIGS. 3 and 4, the arm member 56 serves as the operating tool side portion of the link mechanism 21A, and the swing member 59 and the operating cable 67 serve as the brake side portion of the link mechanism 21A. The lower end surface 56a of the arm member 56 serves as a surface member as a first member provided on the operating tool side portion. The surface member (lower end surface 56a) is provided at the end portion of the operation tool side portion on the input pin member side. The input pin member 65 serves as a moving member as a second member provided on the brake side portion. The output pin member 66 is provided on the swing member 59 and serves as an action unit linked to the parking brake 22. In the present embodiment, the arm member 56 is provided with a surface member and the swing member 59 is provided with a moving member. However, the arm member 56 is provided with a moving member and the swinging member 59 is provided with a surface member. May be good.

As a result, the link mechanism 21A is provided with the operation tool side portion on the brake operating tool side and the brake side portion on the parking brake side so as to be separable, and the operating tool side portion of the link mechanism 21A is used as the first member. A surface member (lower end surface 56a) is provided. A moving member (input pin member 65) as a second member is provided on the brake side portion of the link mechanism 21A.

(Structure of holding mechanism that holds the brake pedal in the braking position)
As shown in FIGS. 3 and 8, the engaging member 71 is supported by the spring-hanging member 53 and the arm portion 53a included in the spring-hanging member 53. The holding member 72 is supported by the bracket 74 via the support shaft 73. The bracket 74 is supported by the driver frame 52 via a stay 75. The holding member 72 has a support shaft 73 in an engaged state of engaging with the arm portion side portion 71a of the engaging member 71 as shown in FIG. 9 and an engaging state of being disengaged from the arm portion side portion 71a as shown in FIG. It is supported by the bracket 74 in a state where it can swing around the axis of the shaft. The holding member 72 is oscillated to the engaging side by a spring 76. The holding member 72 is provided with an operation arm portion 72a, and a release operation tool 77 extends upward from the operation arm portion 72a. The holding member 72 and the release operating tool 77 are supported by the driving unit frame 52 via the bracket 74 and the stay 75, and move together with the brake pedal 12 when the driving unit 4 changes its posture between the maintenance posture and the normal posture.

With the above structure, as shown in FIGS. 3 and 8, the operating unit 4 is provided with a holding mechanism 27A, and the holding mechanism 27A includes a holding member 72 and a spring 76.

As shown in FIGS. 8 and 9, in the holding mechanism 27A, when the brake pedal 12 descends and swings from the release position, the arm portion side portion 71a of the engaging member 71 is outside the hook portion of the holding member 72. It comes into contact with the inclined portion 72b, and the holding member 72 descends while swinging toward the disengagement side against the spring 76. When the brake pedal 12 is in the braking position, the arm portion side portion 71a is disengaged from the outer inclined portion 72b of the holding member 72, and the holding member 72 is engaged with the arm portion side portion 71b by the operation of the spring 76. By this engagement, the brake pedal 12 is held in the braking position by the holding member 72. When the release operating tool 77 is pulled up, the holding member 72 is swung in an disengaged state against the spring 76, and the brake pedal 12 is released from being held at the braking position.

(Structure of a neutral operation mechanism that forcibly operates the hydrostatic continuously variable transmission to the neutral position)
As shown in FIGS. 1 and 2, a shift lever 23 for operating the hydrostatic continuously variable transmission is provided on the side panel 29. As shown in FIGS. 3 and 10, the shift lever 23 is supported by the stay 81 via the support shaft 80. The stay 81 is supported by a side panel frame (not shown). The speed change lever 23 is swung around the axis of the support shaft 80 in the left-right direction of the machine body, so that the neutral position N, the forward side on the front side of the neutral position N, and the reverse side on the rear side of the neutral position N It switches to.

As shown in FIGS. 3 and 10, the neutral operation mechanism 37A interlocks and connects the operation portion 82 provided at the base of the speed change lever 23, the front portion of the operation portion 82, and the arm portion 53a of the spring hook member 53. A first link member 83 and a second link member 84 that interlocks and connects the rear portion of the operation portion 82 and the arm portion 53a are provided. The connection between the first link member 83 and the arm portion 53a and the connection between the second link member 84 and the arm portion 53a slide into the elongated holes 85 formed in the link members 83 and 84 and the elongated holes 85, respectively. It is performed by the connecting pin 86 provided on the arm portion 53a in a state where it can be engaged. When the speed change lever 23 is operated to the forward side and the reverse side while the brake pedal 12 is in the release position, the first link member 83 and the arm portion 53a move relative to each other through the elongated hole 85, and the second link member Since the 84 and the arm portion 53a move relative to each other through the elongated hole 85, the speed change lever 23 can be operated to the forward side and the reverse side.

(Activation of the parking brake and holding mechanism when the brake pedal is stepped on to the braking position)
The state shown in FIG. 4 is a state in which the brake pedal 12 is operated to the release position. When the brake pedal 12 is operated to the braking side in the state shown in FIG. 4, as shown in FIG. 5, the lower end surface 56a (first member, surface member) of the arm member 56 and the input pin are caused by the lowering of the arm member 56. The passive portion 65a of the member 65 (second member, moving member) comes into contact with the lower end surface 56a to press the input pin member 65. By this contact pressing action, the arm member 56 as the operating tool side portion and the swing member 59 as the brake side portion are linked, and the operating force of the brake pedal 12 is transmitted from the arm member 56 to the swing member 59. To. Since the arm member 56 and the swing member 59 swing around different shaft cores, the input pin member 65 (moving member) swings from the arm member 56 while moving rearward on the lower end surface 56a (face member). The operating force is transmitted to the moving member 59. The operating force transmitted to the swing member 59 is transmitted from the output pin member 66 (acting portion) to the operating portion 22a of the parking brake 22 via the operating cable 67, and the parking brake 22 is operated in the braking state. As shown in FIG. 9, when the brake pedal 12 is in the braking position, the holding mechanism 27A is activated, the holding member 72 is locked to the engaging member 71, the brake pedal 12 is held in the braking position, and the parking brake 22 is released. It is maintained in a braking state.

As shown in FIG. 2, in a state where the driving unit 4 is in the normal posture, the lower end surface 56a of the arm member 56 and the input pin member 65 pass through the vertical axis core P2 and are straight lines in the front-rear direction of the machine body. It is configured to be located on L or substantially on a straight line L. The point T shown in FIG. 2 indicates a position where the lower end surface 56a of the arm member 56 is located in a state where the driving unit 4 is in the normal posture. The line K shown in FIG. 2 is a movement restriction of the point T when the operation unit 4 is changed from the normal posture to the maintenance posture, that is, the movement locus of the lower end surface 56a. The line S shown in FIG. 2 is a tangent line at the point T on the movement locus T. The line TZ with an arrow shown in FIG. 2 is a locus of the initial movement of the lower end surface 56a when the driving unit 4 starts to change its posture from the normal posture to the maintenance posture side. As shown in FIG. 2, the lower end surface 56a moves in the direction along the tangent line S at the initial stage when the driving unit 4 starts to change its posture from the normal posture to the maintenance posture side.

The arrow direction C2 shown in FIG. 2 indicates the direction of initial movement of the driving unit 4 when the driving unit 4 starts to change its posture from the normal posture to the maintenance posture side. The arrow direction C1 shown in FIG. 2 indicates the moving direction of the input pin member 65 when the brake pedal 12 is operated to the braking side and the input pin member 65 is moved by the contact pressing action of the lower end surface 56a of the arm member 56. It shows. The operation unit 4 is changed in posture around the vertical axis core P1 in the vertical direction of the machine body, and the swing member 59 including the input pin member 65 swings around the second shaft core Y in the horizontal direction of the machine body. As a result, the direction C2 of the initial movement of the driving unit 4 when the driving unit 4 starts to change its posture from the normal posture to the maintenance posture side, and the moving direction of the input pin member 65 when the brake pedal 12 is operated to the braking side. It is orthogonal to C1. In the present embodiment, the initial movement direction C2 of the driving unit 4 and the movement direction C1 of the input pin member 65 when the input pin member 65 operates the parking brake 22 are set to be orthogonal to each other. A configuration may be adopted in which the intersection angle is larger than the degree or the intersection angle is smaller than 90 degrees.

When the brake pedal 12 is operated to the braking side, the neutral operation mechanism 37A is operated by the operation of the brake pedal 12 to the braking side even if the hydrostatic continuously variable transmission is in the shifting state in the forward range or the reverse range. The speed change lever 23 is forcibly switched to the neutral position N by the first link member 83 and the second link member 84, and the hydrostatic continuously variable transmission is changed to the neutral state.

(About changing the posture of the driver from the normal posture to the maintenance posture)
When the driving unit 4 is changed from the normal posture A1 to the maintenance posture A2, the parking brake 22 and the swing member 59 are left in the machine body 1, and the brake pedal 12, the arm member 56, and the holding mechanism 27A are maintained together with the driving unit 4. Move toward posture A2. As a result, the driving unit 4 is changed from the normal posture A1 to the maintenance posture A2 in both the state where the brake pedal 12 is operated to the release position and the state where the brake pedal 12 is held at the braking position by the holding mechanism 27A. Then, the arm member 56 and the swing member 59 are separated from each other between the lower end surface 56a of the arm member 56 and the input pin member 65 of the swing member 59. The posture of the driving unit 4 can be changed to the maintenance posture A2 without special trouble of separating the link mechanism 21A into the brake pedal side portion and the brake side portion. At the initial stage when the driving unit 4 starts to change its posture from the normal posture to the maintenance posture side, the lower end surface 56a moves in the direction along the tangent line S, and the driving unit 4 starts to change its posture from the normal posture to the maintenance posture side. At the initial stage, since the driving unit 4 moves in the direction intersecting the moving direction C1 of the input pin member 65, the driving unit 4 is placed in the maintenance posture A2 while quickly separating the arm member 56 and the swinging member 59. You can change your posture.

When the operation unit 4 is changed to the maintenance posture A2 while the brake pedal 12 is held in the braking position by the holding mechanism 27A, the input pin member by the lower end surface 56a is used until the arm member 56 is disengaged from the input pin member 65. By pressing 65, the rocking member 59 is maintained in the rocking posture on the braking side. When the arm member 56 is disengaged from the input pin member 65, the swing member 59 returns to the standby position due to the restoring force of the parking brake 22 to the off state.

(About changing the posture from the maintenance posture of the driver to the normal posture)
When the driving unit 4 is changed from the maintenance posture A2 to the normal posture A1 while the brake pedal 12 is being operated to the release position, the arm member 56 is the passive portion 65a of the input pin member 65 as shown in FIG. The lower end surface 56a of the arm member 56 and the passive portion 65a of the input pin member 65 face each other, and the parking brake 22 can be operated to the braking side by depressing the brake pedal 12.

When the driver unit 4 changes its posture from the maintenance posture A2 to the normal posture A1 while the brake pedal 12 is held in the braking position by the holding mechanism 27A, when the driver unit 4 is positioned in front of the normal posture A1, FIG. As shown in the above, the side surface of the arm member 56 abuts on the end surface of the input pin member 65 on the arm member side, and then the arm member 56 swings while pushing the input pin member 65 against the spring 69 to the retracted position. It moves to the member 59 side. Regardless of the contact between the arm member 56 and the input pin member 65, the input pin member 65 does not interfere with the movement of the driving unit 4, and the driving unit 4 can be changed to the normal posture A1. After the driving unit 4 is in the normal posture A1, the holding mechanism 27a releases the holding of the brake pedal 12 at the braking position. Then, the brake pedal 12 is returned to the release position by the spring 54, and the arm member 56 is raised. When the arm member 56 rises, the arm member 56 is disengaged from the input pin member 65, and the input pin member 65 is slid to the action position by the spring 69. As a result, the lower end surface 56a of the arm member 56 and the passive portion 65a of the input pin member 65 face each other, and the parking brake 22 can be operated to the braking side by depressing the brake pedal 12.

(Another Embodiment of the Invention)
Next, the operation structure of the parking brake having another implementation structure will be described. The operating structure of the parking brake with another implementation structure is configured as shown in FIGS. 11-15.

(Brake pedal structure)
As shown in FIGS. 12 and 13, a brake pedal 12 (corresponding to a brake operating tool) is swingably supported up and down around the horizontal axis P3 in the left-right direction of the lower left portion of the driving unit 4. There is.

As shown in FIGS. 12 and 13, the brake pedal 12 includes an L-shaped arm portion 12a and a step portion 12b in a side view. The arm portion 12a of the brake pedal 12 is arranged below the floor portion 14 (see FIG. 11) of the driving portion 4, and the step portion 12b of the brake pedal 12 protrudes upward from the floor portion 14 of the driving unit 4. There is. A spring 13 is connected to the arm portion 12a of the brake pedal 12, and the brake pedal 12 is urged by the spring 13 at the release position shown in FIG.

As shown in FIGS. 12 and 13, the contact portion 12c is connected to the arm portion 12a of the brake pedal 12, and the contact type brake sensor 15 is supported on the upper side of the contact portion 12c.
As shown in FIG. 13, when the brake pedal 12 is operated to the release position, the contact portion 12c of the brake pedal 12 comes into contact with the brake sensor 15, and even if the engine 11 is started in this state, the engine 11 can be started. The engine 11 is not started.

As shown in FIG. 14, when the brake pedal 12 is stepped on to the braking position, the contact portion 12c of the brake pedal 12 is separated from the brake sensor 15. Therefore, if the engine 11 is started in this state, the engine 11 will start. It will be started.

(Linked structure of brake pedal and parking brake)
As shown in FIGS. 12 and 13, the moving arm 17 is connected downward to the arm portion 12a of the brake pedal 12. A roller member 18 is freely rotatably supported around the horizontal axis P4 (corresponding to the axis in the direction intersecting the moving direction C1 described later) below the moving arm 17, and the horizontal axis P4 is the horizontal axis. It is set parallel to P3.

As shown in FIGS. 12 and 13, the support shaft 38 is connected to the frame 16 connected to the machine body 1, and the linking arm 19 swings up and down around the horizontal axis P5 in the left-right direction of the support shaft 38. It is supported freely. The linking arm 19 is formed by bending a plate material, and includes a right and left vertical wall portions 19a and a horizontal upper surface portion 19b connected over the upper part of the right and left vertical wall portions 19a. The upper surface portion 19b is arranged below the moving arm 17 and the roller member 18.

As shown in FIGS. 12 and 13, in the linking arm 19, the linking rod 20 is connected to the portion of the vertical wall portion 19a on the side opposite to the upper surface portion 19b of the linking arm 19 and the parking brake 22. There is.

With the above structure, as shown in FIGS. 12 and 13, a link mechanism 21 for linking the brake pedal 12 and the parking brake 22 is connected to the brake pedal 12 and the parking brake 22, and the link mechanism 21 is connected. Includes a moving arm 17, a roller member 18, a linking arm 19, and a linking rod 20.

In this case, as shown in FIGS. 12 and 13, the moving arm 17 serves as the operating tool side portion of the link mechanism 21, and the linking arm 19 and the linking rod 20 serve as the brake side portion of the link mechanism 21. The roller member 18 becomes a moving member (corresponding to the second member), the upper surface portion 19b of the linking arm 19 becomes a surface member (corresponding to the first member), and the link between the roller member 18 and the linking arm 19 It is a separated part of the mechanism 21.

As a result, the link mechanism 21 is provided with the operation tool side portion on the brake operator side and the brake side portion on the parking brake side so as to be separable, and the brake side portion of the link mechanism 21 is provided with a surface member. A moving member is provided on the operation tool side portion of the link mechanism 21.

(Structure of holding mechanism that holds the brake pedal in the braking operation state)
As shown in FIGS. 12 and 13, a rod-shaped support member 24 is connected to the frame 16 of the machine body 1 and extends upward, around the horizontal axis P6 in the left-right direction of the upper part of the support member 24. , The holding member 25 is swingably supported.

As shown in FIG. 13, a receiving portion 24a to which the holding member 25 hits is connected to the supporting member 24, and a spring 26 (corresponding to the urging member) that urges the holding member 25 toward the receiving portion 24a of the supporting member 24. Is attached to the upper part of the support member 24.

With the above structure, as shown in FIGS. 12 and 13, the frame 16 of the machine body 1 is provided with the holding mechanism 27, and the holding mechanism 27 includes the holding member 25 and the spring 26.
In the state shown in FIG. 13, the holding member 25 is urged toward the receiving portion 24a of the supporting member 24 by the spring 26, the holding member 25 hits the receiving portion 24a of the supporting member 24, and stands still at the position shown in FIG. It is in a state of being.

As shown in FIG. 13, a notch 17a is provided in a portion of the moving arm 17 on the holding member 25 side. As will be described later, the brake pedal 12 is held in the braking operation state by the holding member 25 entering and engaging with the notch 17a of the moving arm 17.

(Structure of a release operating tool that operates the holding member of the holding mechanism to the disengagement side)
As shown in FIGS. 12 and 13, the release operating tool 28 is swingably supported around the horizontal axis P7 on the upper part of the moving arm 17. The release operation tool 28 is extended downward, and the operation portion 28a, which is the lower part of the release operation tool 28, is adjacent to the notch portion 17a of the moving arm 17. The release operation tool 28 is extended upward, and the step portion 28b, which is the upper part of the release operation tool 28, is located above the step portion 12b of the brake pedal 12.

As shown in FIGS. 12 and 13, an arcuate elongated hole 28c centered on the horizontal axis P7 is opened in the release operation tool 28, and a pin 17b connected to the moving arm 17 is a release operation tool. It is inserted into the elongated hole 28c of 28. As a result, the release operation tool 28 is in a swingable state within the range of the elongated hole 28c of the release operation tool 28.

(Structure of a neutral operation mechanism that forcibly operates the hydrostatic continuously variable transmission to the neutral position)
As shown in FIG. 12, a speed change lever 23 for operating a hydrostatic continuously variable transmission is provided, and support members 40 connected to the lower part of the speed change lever 23 are left and right of the support plate 41 fixed to the operation unit 4. It is swingably supported by the support shaft 30 in the direction, and as shown in FIGS. 1 and 11, the speed change lever 23 extends upward from the left side panel 29 of the driving unit 4.

As shown in FIGS. 12 and 13, the speed change lever 23 is oscillating in the front-rear direction around the horizontal axis P8 in the left-right direction of the support shaft 30, and is supported in the neutral position N, the forward side, and the reverse side. It can be operated freely.

As shown in FIGS. 12 and 13, a pin-shaped operating portion 40a is laterally connected to the lower portion of the support member 40, and an arc-shaped elongated hole 41a centered on the horizontal axis P8 is opened in the support plate 41. The operation portion 40a of the support member 40 passes through the elongated hole 41a of the support plate 41 and protrudes to the side opposite to the speed change lever 23.

As shown in FIGS. 12 and 13, the upper portion of the pair of link members 31 is swingably supported by the support shaft 30 around the horizontal axis P8 on the side opposite to the speed change lever 23 with respect to the support plate 41. The link member 31 extends downward so as to sandwich the operation portion 40a of the support member 40.

As shown in FIGS. 12 and 13, a convex portion 31a projecting from the operation portion 40a side of the support member 40 and the side opposite to the operation portion 40a of the support member 40 is provided below the link member 31. As described above, the link member 31 is provided with the convex portion 31a protruding to the side opposite to the operation portion 40a of the support member 40 and the operation portion 40a of the support member 40, so that the pair of link members 31 are common members. Because.

As shown in FIGS. 12 and 13, the upper part of the link member 32 is swingably connected to the lower part of the link member 31 via the pin member 42 around the horizontal axis parallel to the horizontal axis P8. .. An upper portion of the linking member 33 is swingably connected (coordinated) to the lower portion of the link member 32 via a pin-shaped connecting member 34. The linking rod 35 is connected to the arm portion 12a of the brake pedal 12 and the lower portion of the linking member 33.

As shown in FIGS. 12 and 13, a vertically long hole-shaped guide portion 36 is provided in the lower portion of the support plate 41. The connecting member 34 is inserted into the guide portion 36 so that the connecting member 34 can move along the guide portion 36, and the connecting member 34 is guided by the guide portion 36 so as not to move in the front-rear direction. It has become. As shown in FIG. 13, when viewed from the direction of the horizontal axis P8, the straight line connecting the support shaft 30 and the guide portion 36 coincides with the neutral position N of the speed change lever 23.

With the above structure, as shown in FIGS. 12 and 13, the speed change lever 23 is provided with the neutral operation mechanism 37, and the neutral operation mechanism 37 includes the link members 31, 32, the connection member 34, and the guide portion 36. ing.
As will be described later, when the brake pedal 12 is stepped on to the braking position while the shift lever 23 is operated to the forward side or the reverse side, the neutral operation mechanism 37 forcibly shifts the shift lever 23 to the neutral position N. It is operated and the hydrostatic continuously variable transmission is forcibly operated to the neutral position N.

(Activation of the parking brake and holding mechanism when the brake pedal is stepped on to the braking position)
The state shown in FIG. 13 is a state in which the brake pedal 12 is operated to the release position and the parking brake 22 is operated to the release state. In the neutral operation mechanism 37, the link member 31 is separated from the operation portion 40a of the support member 40. Therefore, the speed change lever 23 is in a state where it can be operated freely on the forward side and the reverse side.

When the brake pedal 12 is stepped on to the braking position in the state shown in FIG. 13, as shown in FIGS. 13 to 12 and 14, the moving arm 17 moves to the lower side of the linking arm 19 while moving to the rear side. It moves to the holding mechanism 27 side.

As a result, as shown in FIGS. 13 to 12 and 14, the roller member 18 hits the upper surface portion 19b of the linking arm 19 from above, and the roller member 18 pushes the upper surface portion 19b of the linking arm 19 downward while pushing the upper surface portion 19b of the linking arm 19 downward. Along the moving direction C1, the linking arm 19 rolls on the upper surface portion 19b toward the horizontal axis P5. In this case, the horizontal axis P4 on which the roller member 18 rotates intersects the moving direction C1 at 90 ° in a plan view.

As described above, when the roller member 18 pushes the upper surface portion 19b of the linking arm 19 downward, the linking arm 19 swings around the horizontal axis P5 as shown in FIGS. 12 and 14, and the linking rod 20 is pulled toward the linking arm 19 side, and the parking brake 22 is operated in the braking state.

As described above, when the brake pedal 12 is stepped on to the braking position, as shown in FIGS. 12 and 14, the moving arm 17 moves to the holding mechanism 27 side while moving to the linking arm 19 side, thereby moving. The arm 17 hits the holding member 25 and pushes up the holding member 25 a little, and then the holding member 25 enters and engages with the notch 17a of the moving arm 17, so that the brake pedal 12 is held in the braking operation state. ..
By holding the brake pedal 12 in the braking operation state in this way, the parking brake 22 is held in the braking state.

As shown in FIGS. 12 and 14, when the brake pedal 12 is held in the braking operation state and the step portion 28b of the release operation tool 28 is stepped on as shown in FIG. 15, the release operation tool 28 is laterally operated. Swinging around the shaft core P7, the holding member 25 is pushed out from the notch 17a of the moving arm 17 by the operating portion 28a of the disengaging operating tool 28 and operated toward the disengagement side.

As a result, as shown in FIGS. 15 to 13, the brake pedal 12 is operated to the release position by the spring 13. At the same time, the parking brake 22 is operated in the released state by the spring (not shown) provided in the parking brake 22, and the linking arm 19 swings to return to the state shown in FIG.

(Operation of the neutral operation mechanism when the brake pedal is stepped on to the braking position)
As shown in FIG. 13, in the state where the brake pedal 12 is operated to the release position, in the neutral operation mechanism 37, the connection member 34 is located above the guide portion 36, and the link member 31 is the operation portion 40a of the support member 40. The speed change lever 23 is in a state of being freely operable on the forward side and the reverse side.

When the brake pedal 12 is stepped on to the braking position from the state shown in FIG. 13 and as shown in FIGS. 12 and 14, the linking rod 35 is pulled toward the brake pedal 12, and the connecting member 34 is moved to the guide portion 36. The link member 32 is pulled down along with the movement, and the link member 31 is closed to approach the operation portion 40a of the support member 40 from both sides.

As shown in FIG. 13, when the link member 31 is closed and approaches the operation portion 40a of the support member 40 from both sides while the speed change lever 23 is operated to the forward side, the convex portion 31a of one of the link members 31 is approached. Hits the operation portion 40a of the support member 40 and pushes the operation portion 40a of the support member 40 toward the neutral position N side for operation.

When the link member 31 is closed and approaches the operation portion 40a of the support member 40 from both sides while the speed change lever 23 is operated to the reverse side, the convex portion 31a of the other link member 31 operates the support member 40. It hits the portion 40a and pushes the operation portion 40a of the support member 40 toward the neutral position N side for operation.

As shown in FIGS. 12 and 14, when the brake pedal 12 reaches the braking position, the connecting member 34 reaches the lower part of the guide portion 36, and the convex portion 31a of the link member 31 positions the operating portion 40a of the support member 40 in the neutral position. It is sandwiched between N and the shift lever 23 is held at the neutral position N.
By operating the speed change lever 23 to the neutral position N in this way, the hydrostatic continuously variable transmission is operated to the neutral position N.

As shown in FIGS. 12 and 14, the step portion 28b of the release operating tool 28 is stepped on while the brake pedal 12 is held in the braking operation state, and as shown in FIG. 13, the brake pedal 12 is operated by the spring 13. Is operated to the release position, the linking rod 35 is operated to the link members 31 and 32 side.
As a result, as shown in FIG. 13, the connecting member 34 moves from the lower part to the upper side of the guide portion 36, and the link members 31 and 32 are opened and operated to return to the state shown in FIG.

As described above, regardless of whether the speed change lever 23 is operated to the forward side or the reverse side, the link member 31 directly hits the operation portion 40a of the support member 40 to operate the speed change lever 23 to the neutral position N. Therefore, the speed change lever 23 is surely operated to the neutral position N regardless of the operation position of the speed change lever 23, and the hydrostatic continuously variable transmission is operated to the neutral position N.

In a state where the speed change lever 23 is operated to the neutral position N, the operation portion 40a of the support member 40 is sandwiched by the link member 31 and held at the neutral position N, so that after the speed change lever 23 is operated to the neutral position N, , The shift lever 23 does not move slightly from the neutral position N to the forward side or the reverse side, and the hydrostatic continuously variable transmission is not slightly operated to the forward side or the reverse side.

When the operation portion 40a of the support member 40 is sandwiched by the link member 31 and held in the neutral position N, as shown in FIGS. 12 and 14, the operation portion 40a of the support member 40 is held by the convex portion 31a of the link member 31. Is sandwiched.
As a result, as shown in FIGS. 12 and 14, in the state where the speed change lever 23 is held in the neutral position N, the link members 31 are not in a state of being close to parallel to each other, and the link members 31 are in a state of being slightly separated from each other. Therefore, as shown in FIG. 13, when the brake pedal 12 is operated to the release position, the link members 31 are reasonably separated from each other and return to the state shown in FIG.

As shown in FIGS. 12, 13 and 14, the connecting member 34 has a function of transmitting the stepping operation to the braking position and the operation to the release position of the brake pedal 12 to the link members 31 and 32, and the guide portion 36. It has a guide function to set the moving direction of the link members 31 and 32 in cooperation with.

(The state of each part when the driving part is changed to the normal posture and the maintenance posture when the brake pedal is operated to the release position)
A brake pedal 12, a moving arm 17, a roller member 18, a speed change lever 23, and a neutral operation mechanism 37 are provided in the driving unit 4, and a parking brake 22, a linking arm 19, and a holding mechanism 27 are provided in the machine body 1. ing.

As a result, as shown in FIG. 11, when the driving unit 4 is changed from the normal posture A1 to the maintenance posture A2, the parking brake 22, the linking arm 19, and the holding mechanism 27 are left in the machine body 1, and the brake pedal 12 and the moving arm 17 are left. , The roller member 18, the speed change lever 23, and the neutral operation mechanism 37 move to the maintenance posture A2 together with the driving unit 4.

As shown in FIGS. 11 and 12, the linking arms 19 are arranged in the front-rear direction of the machine body 1 in a plan view, and the moving direction C1 is also in the front-rear direction of the machine body 1 in a plan view. The vertical axis core P2 is arranged in the vicinity of the virtual line extending from the linking arm 19 to the rear of the machine body 1 in a plan view, and the normal posture A1 of the driving unit 4 is along the front-rear direction of the machine body 1. It is in a posture.

As a result, as shown in FIGS. 11 and 12, the direction C2 of the initial movement of the driving unit 4 when the driving unit 4 starts to be changed from the normal posture A1 to the maintenance posture A2 is the left and right of the machine body 1 in a plan view. It is the direction. The initial movement direction C2 of the driving unit 4 which is the left-right direction of the machine body 1 and the movement direction C1 which is the front-rear direction of the machine body 1 are orthogonal to each other in a plan view.

As shown in FIG. 13, the roller member 18 is located directly above the upper surface portion 19b of the linking arm 19 in a state where the driving unit 4 is located in the normal posture A1 and the brake pedal 12 is operated to the release position.

In the above state, when the driving unit 4 is changed from the normal posture A1 to the maintenance posture A2, the roller member 18 moves in the initial movement direction C2 (see FIG. 12) of the driving unit 4, and the upper surface of the linking arm 19 is moved. Move away from part 19b.
As a result, the roller member 18 and the upper surface portion 19b of the linking arm 19 are separated from each other on the same release side, and the link between the brake pedal 12 and the parking brake 22 is released.

Next, when the driving unit 4 is changed from the maintenance posture A2 to the normal posture A1, the roller member 18 approaches the linking arm 19, and when the roller member 18 reaches immediately before the upper surface portion 19b of the linking arm 19, the roller The member 18 moves in the initial movement direction C2 of the driving unit 4 and approaches the upper surface portion 19b of the linking arm 19, and reaches directly above the upper surface portion 19b of the linking arm 19 as shown in FIG.
As a result, the roller member 18 and the upper surface portion 19b of the linking arm 19 approach each other on the same release side, and the brake pedal 12 and the parking brake 22 return to the linked state.

(The state of each part when the driving part is changed to the normal posture and the maintenance posture while the brake pedal is held in the braking operation state)
As shown in FIGS. 12 and 14, in the state where the brake pedal 12 is held in the braking operation state (the state in which the parking brake 22 is held in the braking state), the driving unit 4 changes from the normal posture A1 to the maintenance posture A2. Then, the moving arm 17 separates from the holding mechanism 27 while the roller member 18 moves in the initial movement direction C2 of the driving unit 4.

As a result, the cutout portion 17a of the moving arm 17 is separated from the holding member 25, and the brake pedal 12 is operated by the spring 13 to the release position shown in FIG. At the same time, the roller member 18 is separated from the upper surface portion 19b of the linking arm 19, and the parking brake 22 is operated in the released state by the spring provided in the parking brake 22, so that the linking arm 19 swings. The state returns to the state shown in FIG.
As described above, the roller member 18 and the upper surface portion 19b of the linking arm 19 are separated from each other on the same release side, so that the link between the brake pedal 12 and the parking brake 22 is released.

Next, when the driving unit 4 is changed from the maintenance posture A2 to the normal posture A1, the roller member 18 approaches the linking arm 19, and the roller member 18 is immediately before the upper surface portion 19b of the linking arm 19 as described above. When it reaches, the roller member 18 moves in the initial movement direction C2 of the driving unit 4 and approaches the upper surface portion 19b of the linking arm 19, and reaches directly above the upper surface portion 19b of the linking arm 19 as shown in FIG.
As a result, the roller member 18 and the upper surface portion 19b of the linking arm 19 approach each other on the same release side, and the brake pedal 12 and the parking brake 22 return to the linked state.

(Another embodiment of other inventions)
Instead of the brake pedal 12, a manually operated brake lever (not shown) may be provided as a brake operating tool. The release operation tool 28 may be supported by the brake operation tool.

Instead of the roller member 18, the moving arm 17 may be provided with a non-rotating contact portion as a moving member. According to this structure, the contact portion of the moving arm 17 hits the upper surface portion 19b of the linking arm 19 and slides along the upper surface portion 19b of the linking arm 19.

The moving arm 17 may be provided with a surface member, and the linking arm 19 may be provided with a moving member. According to this structure, when the surface member hits the moving member and moves, the moving member relatively moves on the surface member, and the moving member is pushed by the surface member.

The initial movement direction C2 and the movement direction C1 of the driving unit 4 are not set to be orthogonal to each other, but the initial movement direction C2 and the moving direction C1 of the driving unit 4 are at an angle slightly larger than 90 °, or It may be set to intersect at an angle slightly smaller than 90 °.

In the holding mechanism 27, the holding member 25 does not engage with the moving arm 17, but the holding member 25 engages with the arm portion 12a of the brake pedal 12 and the step portion 12b of the brake pedal 12, so that the brake pedal 12 is engaged. It may be held in the braking operation state.

The neutral operation mechanism 37 is made to act directly on the operation unit (trunnion shaft) of the hydrostatic continuously variable transmission instead of the speed change lever 23, and the operation unit (trunnion shaft) of the hydrostatic continuously variable transmission is placed in the neutral position N. It may be configured to operate in. A rod or wire may be used instead of the link member 32.

When the driving unit 4 is changed to the normal posture A1 and the maintenance posture A2, the driving unit 4 may be translated from the normal posture A1 to the lateral side of the machine body 1 to be changed to the maintenance posture A2.
The driving unit 4 may be changed to the maintenance posture A2 by swinging the driving unit 4 so as to lift it upward from the normal posture A1 around the horizontal axis in the left-right direction of the front portion or the rear portion of the driving unit 4.

The present invention includes not only self-removing combine harvesters, but also ordinary combine harvesters, sugar cane harvesters, corn harvesters, feed harvesters that harvest crops for roughage and mixed feed, shred them, and pack them into rolls. It can also be applied to harvesters.

1 Main body 2 Traveling device 4 Driving unit 12 Brake operating tool (brake pedal)
14 Floor 18 Second member (moving member, roller member)
19 Brake side part 19b First member (upper surface part, surface member)
21 Link mechanism 21A Link mechanism 22 Parking brake 25 Holding member 26 Biasing member (spring)
27 Holding mechanism 28 Release operation tool 56 Arm member 56a First member (surface member, lower end surface)
57 Through hole 59 Swing member 65 Second member (input pin member, moving member)
66 Acting part (output pin member)
A1 Normal posture A2 Maintenance posture C1 Moving member moving direction C2 Initial moving direction of the driving part P3 Horizontal axis X 1st axis Y 2nd axis

Claims (7)

A harvester in which the driving unit is supported by the main body of the machine in a state in which the posture can be freely changed between the normal posture during running and the maintenance posture away from the normal posture.
A parking brake that is supported by the main body of the aircraft and brakes the traveling device,
A brake operating tool provided in the driving unit to operate the parking brake,
A link mechanism for linking the brake operating tool and the parking brake is provided.
The link mechanism is provided so that the operation tool side portion on the brake operation tool side and the brake side portion on the parking brake side can be separated.
When the driving unit is changed from the normal posture to the maintenance posture side, the operating tool side portion and the brake side portion are separated so that the linkage between the brake operating tool and the parking brake is released. Configured
A first member is provided on one of the operating tool side portion and the brake side portion, and a second member is provided on the other side of the operating tool side portion and the brake side portion.
When the brake operating tool is operated to the braking side when the driving unit is in the normal posture, the parking brake is operated to the braking side by the contact pressing action between the first member and the second member.
The first member is a harvester provided at an end portion on the second member side of one of the operation tool side portion and the brake side portion. One of the first member and the second member is composed of a surface member, and the other of the first member and the second member is composed of a moving member that can move on the surface member.
When the brake operating tool is operated to the braking side when the driving unit is in the normal posture, the moving member moves on the surface member, and the parking brake is operated to the braking side.
The harvest according to claim 1, wherein the direction of initial movement of the driving unit and the moving direction of the moving member when the driving unit starts to change from the normal posture to the maintenance posture side are set to intersect. Machine. The harvester according to claim 2, wherein the direction of initial movement of the driving unit and the direction of movement are orthogonal to each other. The brake operating tool can swing around the first axis in the left-right direction of the machine body located on the rear side of the operating portion of the brake operating tool.
The operating tool side portion is formed in an arc shape that is arranged in front of the first shaft core and bulges toward the front side of the machine body, and is moved up and down around the first shaft core by operating the brake operating tool. Equipped with a swinging arm member,
A through hole through which the arm member is passed is formed on the floor of the driving unit, and the arm member is inserted through the through hole.
The harvester according to any one of claims 1 to 3, wherein the first member is provided at a lower end of the arm member. The brake side portion is provided with a swing member capable of swinging around the second shaft core in the left-right direction of the machine body.
A portion of the swing member above the second shaft core is provided with one of the first member and the second member, and a portion below the second shaft core of the swing member. The harvester according to any one of claims 1 to 4, further comprising an action unit linked to the parking brake. The harvester according to claim 2 or 3, wherein the moving member is a roller member that rotates around an axis in a direction intersecting the moving direction. A holding mechanism provided on the main body of the machine to hold the brake operating tool in the braking operation state is provided.
A holding member that engages with the brake operating tool or a portion on the operating tool side to hold the brake operating tool in the braking operation state, and an urging member that urges the holding member to the engaging side. And are prepared,
The harvester according to any one of claims 1 to 6, wherein the disengaging operation tool for operating the holding member on the disengagement side is supported by the brake operation tool or the operation tool side portion.

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