JP5184397B2 - HST gear shifting pedal assembly - Google Patents

Description

  The present invention relates to a pedal assembly for HST speed change operation for operating an output adjusting member in HST capable of outputting continuously variable rotational power in both forward and reverse directions.

  A bracket that can be mounted on an airframe forming member in a working vehicle such as a tractor, and a first shaft and a second shaft that are both supported by the bracket so as to be arranged in parallel in the longitudinal direction of the airframe in a state along the width of the airframe A single pedal supported by the first shaft, a second pedal supported by the second shaft, and an HST output adjustment member provided in the work vehicle via a connecting member. The operating arm is swung to one side so that when the first pedal is operated, the connecting member is moved to the one side in the longitudinal direction, and when the second pedal is operated, the connecting member is There has been proposed an HST speed change pedal assembly in which the operating arm is swung to the other side so as to move to the other side in the direction (see, for example, Patent Documents 1 and 2 below).

  Specifically, in the pedal assembly for HST speed change operation described in Patent Documents 1 and 2, the operation arm is supported by the first shaft so as not to rotate relative to the first shaft, and is operated by the second shaft via a link mechanism. When the first pedal is operated to one side about the corresponding first axis, the operating arm is swung to one side, and the second pedal is rotated about the corresponding second axis. When operated to one side which is the same direction as the operation direction of one pedal, the operation arm is swung to the other side.

  The pedal assemblies described in Patent Documents 1 and 2 are useful in that the first and second pedals can be operated in the same direction, so that the operability for both pedals can be improved. On the other hand, since the first and second pedals are supported by the first and second shafts, respectively, there are the following inconveniences.

That is, in the pedal assembly described in Patent Document 1, the first shaft is disposed on the rear side in the longitudinal direction of the machine body with respect to the second shaft.
The first pedal acting as a forward pedal includes a first pedal arm whose base end is supported by the first shaft so as not to rotate relative to the first pedal, and a first end supported by the free end of the first pedal arm. The second pedal having a pedal body and acting as a reverse pedal has a base end portion supported on the second shaft so as not to rotate relative to the second pedal arm, and a free end portion of the second pedal arm. A second pedal body supported.

By the way, in order to improve the operability with respect to the first and second pedal bodies, it is preferable that the two pedal bodies are arranged close to each other.
However, in order to arrange the first and second pedal bodies close to each other in the configuration described in Patent Document 1, the first pedal arm must be extremely longer than the second pedal arm, A large load is applied to the first pedal arm.

Further, in the configuration described in Patent Document 1, the first pedal arm is supported in a relatively non-rotatable manner at the inner end portion in the body width direction of the first shaft disposed on the rear side, The two-pedal arm is supported on the outer end in the body width direction of the second shaft disposed on the front side so as not to be relatively rotatable.
Therefore, in order to arrange the first and second pedal bodies close to each other, the first pedal arm must be elongated while being bent in the body width direction.

On the other hand, in the pedal assembly described in Patent Document 2, the first pedal of the first pedal, which functions as a forward pedal, is arranged such that the first shaft is disposed in front of the second shaft in the longitudinal direction of the machine body. The arm is supported on the first shaft so as not to rotate relative to the first shaft, and the second pedal arm of the second pedal acting as a reverse pedal is supported on the second shaft so as not to rotate relative to the second shaft.
In the pedal assembly described in Patent Document 2, it is necessary to make the second pedal arm longer than the first pedal arm in order to arrange the first and second pedal bodies close to each other.

In the pedal assembly described in Patent Document 2, the base end portion of the first pedal arm and the base end portion of the second pedal arm are located at the same position in the body width direction.
In such a configuration, in order to prevent the second pedal arm and the first pedal arm from interfering with each other, the second pedal arm must be suddenly bent in the body width direction. There was also a problem that a heavy load was applied to the pedal arm.

US Pat. No. 5,842,378 Japanese Patent Laid-Open No. 10-247119

  The present invention has been made in view of the above prior art, and is an HST speed change pedal assembly for operating an output adjustment member in an HST capable of outputting rotational power continuously variable in both forward and reverse directions. An object of the present invention is to provide a pedal assembly for HST speed change operation in which the pedal bodies of both the pedals can be arranged close to each other without difficulty while maintaining the same operation direction of the forward rotation pedal and the reverse rotation pedal.

  One aspect of the present invention is an HST gear shifting operation pedal assembly for operating an output adjusting member in an HST capable of outputting rotational power continuously variable in both forward and reverse directions to achieve the above object. A bracket to be mounted on an airframe forming member forming the airframe, the bracket having a support wall extending in the longitudinal direction of the airframe with a gap between the airframe forming member and the width direction of the airframe. A first shaft supported by a support wall, the first shaft being rotatable in a first direction on one side and a second direction on the other side around an axis; and the support in a state parallel to the first shaft A second shaft supported by the wall, which is supported by the first shaft so as to be rotatable in the first direction on one side and the second direction on the other side, and on the first shaft so as not to be relatively rotatable. The first pedal and the first pedal are axes of the first axis A second pedal that is supported by the first shaft so as to be relatively rotatable at a position displaced with respect to the direction, and an operation arm that is supported by the first shaft so as not to be rotatable relative to the first shaft. An operation arm operatively connected to the member, and the second pedal around the axis in the first direction and the first direction according to the rotation of the second pedal in the first direction and the second direction around the axis of the first axis, respectively. A first link mechanism that rotates in two directions, and a second link mechanism that rotates the operation arm in a second direction around the axis of the first axis in response to rotation in the first direction around the axis of the second axis. Provided is an HST shift operation pedal assembly.

Preferably, the brackets are first and second bearing bosses respectively inserted into first and second bearing holes formed in the support wall, and the inner and outer sides in the body width direction across the support wall. First and second bearing bosses extending in the direction may be further provided.
In such a configuration, the first and second shafts are supported by the first and second bearing bosses, respectively.
The first pedal includes a first pedal boss that is externally inserted into the first shaft so as not to rotate relative to the first shaft on the outer side in the body width direction from the first bearing boss, and a first end that is fixed to the first pedal boss. A pedal arm; and a first pedal body attached to a free end of the first pedal arm, wherein the second pedal is an axis of the first shaft with respect to the first bearing boss and the first pedal boss. A second pedal boss extrapolated relative to the first shaft at a position displaced with respect to the direction, a second pedal arm having a base end fixed to the second pedal boss, and the second pedal arm freely. And a second pedal body attached to the end.
The operation arm is supported by the first shaft so as not to rotate relative to the first bearing boss on the inner side in the body width direction.

More preferably, the bracket may further include a reinforcing stay that connects portions of the first and second bearing bosses located on the outer side in the body width direction from the support wall.
The reinforcing stay includes a first vertical surface fixed to an outer surface of the first bearing boss opposite to the second bearing boss, and an outer surface of the second bearing boss opposite to the first bearing boss. A second vertical surface fixed to the surface, and a horizontal plane connecting lower ends of the first and second vertical planes, and the first vertical plane, the second vertical plane, and the horizontal plane in the body width direction An inner end is fixed to the outer surface of the support wall.

The first link mechanism includes an operation side link extending radially outward from the second pedal boss, and a radially outward direction with respect to the axis of the second shaft in a state in which the second shaft is not relatively rotatable about the axis. And a driven link that has one end connected to the operation side link and the other end connected to the driven link.
Preferably, at least one of the one end side and the other end side of the connection link is connected to the corresponding operation side link or the driven side link corresponding to a plurality of positions at different distances from the axis of the first axis or the second axis. It is possible.

  According to another aspect of the present invention, there is provided a pedal assembly for HST speed change operation for operating an output adjusting member in the HST capable of outputting rotational power continuously variable in both forward and reverse directions to achieve the above object. A bracket that is attached to an airframe forming member that forms the airframe, and has a support wall that extends in the longitudinal direction of the airframe with a gap between the bracket and the airframe forming member, and extends along the width direction of the airframe A first axis supported by the support wall, wherein the first axis is rotatable about the axis in a first direction on one side and a second direction on the other side, and in a state parallel to the first axis. A second shaft supported by the support wall, wherein the second shaft is rotatable in the first direction on one side and the second direction on the other side around the axis, and is rotatably mounted on the first shaft. The inserted first pedal boss and the base end are the first pedal boss A first pedal including a first pedal arm that is worn and a first pedal body that is mounted on a free end of the first pedal arm, and the first pedal boss are displaced with respect to the axial direction of the first shaft. A second pedal boss that is extrapolated to the first shaft so as not to rotate relative to the second pedal arm, a second pedal arm having a base end fixed to the second pedal boss, and a second end mounted on the free end of the second pedal arm. A second pedal including a pedal body, an operation arm supported by the first pedal boss so as not to be relatively rotatable, an operation arm operatively connected to the output adjustment member via a connection member, and the first shaft A first link mechanism for rotating the second shaft in the first direction and the second direction around the axis, respectively, in response to the pivoting movement in the first direction and the second direction around the axis, and the first around the axis of the second axis. Before according to the rotation in the direction The operating arm provides HST shift operating pedal assembly with a second link mechanism for rotating the axis line second direction of the first axis.

  In the pedal assembly for HST speed change operation concerning one mode of the present invention, the operation arm which is operatively connected to the output adjustment member of the HST via the connecting member and the first pedal which is one of the forward pedal or the reverse pedal. The second pedal, which is the other of the forward pedal and the reverse pedal, is supported by the first shaft so as to be relatively non-rotatable. The second pedal is supported by the first shaft so as to be relatively rotatable. A first link mechanism for rotating the second shaft in the first direction and the second direction around the axis, respectively, in response to the pivoting operation in the first direction and the second direction around the axis of the first shaft; and the second shaft And a second link mechanism that rotates the operation arm in a second direction around the axis of the first axis in response to rotation in the first direction around the axis of the first axis. Accordingly, the pedal bodies of the two pedals can be moved relative to each other without making the pedal arms of both the pedals longer and / or sharply bent while allowing the first and second pedals to be operated in the same direction. Proximity placement is possible.

  In the pedal assembly for HST speed change operation according to another aspect of the present invention, the first pedal boss of the first pedal, which is one of the forward pedal and the reverse pedal, is supported relative to the first shaft so as to be relatively rotatable, and the HST An operation arm that is operatively connected to the output adjustment member via a connecting member is supported by the first pedal boss so as not to be relatively rotatable. On the other hand, a second pedal boss of the second pedal that is the other of the forward pedal and the reverse pedal is provided. The first shaft is supported so as not to rotate relative to the first shaft, and the second shaft rotates in the first direction and the second direction around the axis of the first shaft. A first link mechanism for rotating in the direction, and a second link mechanism for rotating the operation arm in the second direction around the axis of the first axis in response to rotation in the first direction around the axis of the second axis. Being . Accordingly, the pedal bodies of the two pedals can be moved relative to each other without making the pedal arms of both the pedals longer and / or sharply bent while allowing the first and second pedals to be operated in the same direction. Proximity placement is possible.

FIG. 1 is a side view of a tractor as an example of a working vehicle to which a pedal assembly for HST speed change operation according to the present invention is applied. FIG. 2 is an enlarged perspective view of the tractor shown in FIG. FIG. 3 is an exploded perspective view of the tractor shown in FIGS. 1 and 2. FIG. 4 is an upper perspective view of the pedal assembly for HST speed change operation according to the first embodiment of the present invention. FIG. 5 is a lower perspective view of the assembly according to the first embodiment. FIG. 6 is an exploded perspective view of the assembly according to the first embodiment viewed from the rear. FIG. 7 is an exploded perspective view of the assembly according to the first embodiment when viewed from the front. FIG. 8 is a perspective view of the assembly according to the first embodiment when viewed from the outer side in the body width direction of the working vehicle. FIG. 9 is a perspective view of the assembly according to the first embodiment when viewed from the inner side in the body width direction of the working vehicle. FIG. 10 is a side view of a modification of the first embodiment. FIG. 11 is a perspective view of the HST speed change pedal assembly according to the second embodiment of the present invention as viewed from the outer side in the body width direction. FIG. 12 is a perspective view of the assembly according to the second embodiment when viewed from the inner side in the body width direction. FIG. 13 is an exploded perspective view of the assembly according to the second embodiment.

Embodiment 1
Hereinafter, a preferred embodiment of a pedal assembly for HST shift operation according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a side view of a tractor 1, which is an example of a working vehicle to which an HST speed change pedal assembly 100A according to the present invention is applied.
2 and 3 are an enlarged perspective view and an exploded perspective view of the tractor 1, respectively.

The pedal assembly 100A for HST speed change operation is configured to be able to operate the HST 20 provided in the work vehicle 1 in both the forward direction and the reverse direction.
The HST 20 is inserted in a travel system transmission path from the drive source 10 to the drive wheels, and is configured to continuously change the drive speed of the drive wheels in both forward and reverse directions.
In the tractor 1, the rear wheel 30R acts as a main drive wheel and the front wheel 30F acts as a sub drive wheel.

  Although not shown, the HST 20 includes a pump shaft that is operatively connected to the drive source 10, a hydraulic pump body that is supported relative to the pump shaft so as not to rotate relative to the pump shaft, and a hydraulic pump body that passes through a pair of HST lines. A hydraulic motor main body fluidly connected to the motor shaft, a motor shaft that supports the hydraulic motor main body so as not to be relatively rotatable, a motor shaft that outputs rotational power toward the drive source, the hydraulic pump main body, and the hydraulic motor An output adjusting member that changes the volume of at least one of the main bodies (hereinafter referred to as a variable volume member).

The output adjusting member is, for example, a movable swash plate that can swing around a swing axis, and a movable swash plate (not shown) that defines the volume of the volume variable member according to a tilt position around the swing axis. And a control shaft 25 (see FIG. 3) for swinging the movable swash plate about the swing axis in response to rotation about its own axis.
As shown in FIG. 3, a control arm 26 is connected to the control shaft 25 so as not to be relatively rotatable. When the control arm 26 is swung to one side and the other side around the axis of the control shaft 25, The movable swash plate swings in the forward direction and the reverse direction.

FIGS. 4 and 5 respectively show an upper perspective view and a lower perspective view of the pedal assembly 100A for HST speed change operation according to the present embodiment.
6 and 7 are exploded perspective views of the assembly 100A as viewed from the rear and the front, respectively.

  As shown in FIGS. 4 to 7, the assembly 100 </ b> A includes a bracket 110, a first shaft 120 and a second shaft 125 supported by the bracket 110, and a first pedal 130 supported by the first shaft 120. And a second pedal 135.

The bracket 110 is detachably attached to an airframe forming member that forms an airframe in the work vehicle 1.
Specifically, as shown in FIGS. 4 to 7, the bracket 110 is installed in the longitudinal direction of the airframe with a gap between the airframe forming member and a mounting wall 111 that is detachably attached to the airframe forming member. And a pair of front and rear connection walls 113 that connect the mounting wall 111 and the support wall 112.

  In the present embodiment, as shown in FIG. 3, the working vehicle 1 is provided between the engine 10 disposed on the front side of the body and the transmission 40 disposed on the rear side of the body as the body forming member. The bracket 110 is detachably attached to the intermediate housing 50. The intermediate housing 50 extends in the vehicle longitudinal direction.

The first shaft 120 is supported at one point by the support wall 112 so as to be rotatable in both the first direction on one side and the second direction on the other side around the axis in a state along the body width direction.
The second shaft 125 is supported at one point by the support wall 112 so as to be rotatable in both the first direction on one side and the second direction on the other side around the axis in a state parallel to the first shaft 120.

In the present embodiment, the bracket 110 has first and second bearing bosses 112a inserted into first and second bearing holes formed in the support wall 112, as shown in FIGS. 112b, further including first and second bearing bosses 112a and 112b extending inward and outward in the body width direction with the support wall 112 interposed therebetween.
The first and second shafts 120 and 125 are supported by the first and second bearing bosses 112a and 112b, respectively, so as to be capable of rotating in both directions around the axis.
According to such a configuration, it is possible to stabilize the support of the first and second shafts 112a and 112b.

Preferably, the bracket 110 connects portions of the first and second bearing bosses 112a and 112b located on the outer side in the body width direction of the support wall 112, as shown in FIGS. A reinforcement stay 115 can be further provided.
By providing the reinforcing stay 115, it is possible to further support and stabilize the first and second shafts 120 and 125.

  In the present embodiment, as shown in FIGS. 5 and 6, etc., the reinforcing stay 115 is fixed to the outer surface of the first bearing boss 112a opposite to the second bearing boss 112b. A vertical surface 116; a second vertical surface 117 fixed to the outer surface of the second bearing boss 112b opposite to the first bearing boss 112a; and lower ends of the first and second vertical surfaces 116, 117 The first vertical surface 116, the second vertical surface 117, and the inner end in the body width direction of the horizontal surface 118 are fixed to the outer surface of the support wall 112.

In the present embodiment, as shown in FIGS. 4 to 7, a ratchet member 90 is supported on the inner end of the first shaft 120 in the body width direction so as not to be relatively rotatable.
The ratchet member 90 is a member for cooperating with a shift lock mechanism (not shown) to fix the position around the axis of the first shaft 120, thereby maintaining the output state of the HST 20 in a desired state.

The first pedal 130 is supported by the first shaft 120 so as not to rotate relative to the first shaft 120.
On the other hand, the second pedal 135 is supported by the first shaft 120 so as to be rotatable relative to the first pedal 130 at a position displaced with respect to the axial direction of the first shaft 120.

  In the present embodiment, as shown in FIGS. 4 to 7, the first pedal 130 is extrapolated so as not to rotate relative to the first shaft 120 on the outer side in the body width direction from the first bearing boss 112a. A first pedal boss 131, a first pedal arm 132 having a base end fixed to the first pedal boss 131, and a first pedal body 133 attached to a free end of the first pedal arm 132. doing.

The second pedal 135 includes a second pedal boss 136 that is externally rotatably inserted into the first shaft 120 at a position displaced with respect to the first pedal boss 131 in the axial direction, and a base end portion of the second pedal boss 136. A second pedal arm 137 fixed to 136; and a second pedal body 138 attached to a free end of the second pedal arm 137.
In the present embodiment, the second pedal boss 136 is positioned on the outer side in the body width direction from the first pedal boss 131.

  As shown in FIGS. 1 to 3, the bracket 110 is attached to the airframe forming member (the intermediate housing 50 in the present embodiment) below the floor member 60 in the working vehicle 1. The first and first pedal arms 132 and 137 are formed on the floor member 60 such that free ends that support the first and second pedal bodies 133 and 138 are positioned above the floor member 60. The slits 61 and 62 are inserted.

  The pedal assembly 100A for HST speed change operation according to the present embodiment is further an operation arm 140 that is supported on the first shaft 120 so as not to rotate relative to the first shaft 120. In the embodiment, the operation arm 140 operatively connected to the control arm 26), and the second pedal 135 according to the second shaft 135 according to the turning operation around the first shaft 120 in the first direction and the second direction. A first link mechanism 150 that rotates the shaft 125 around the axis in the first direction and the second direction, respectively, and the operation arm 140 that moves the first arm 120 according to the rotation of the second shaft 125 around the axis in the first direction. And a second link mechanism 160 that rotates the second link mechanism 160 in the second direction.

8 and 9 are perspective views of the assembly 100A viewed from the outer side and the inner side in the body width direction, respectively.
8 and 9, the ratchet member 90 is omitted for easy understanding.

As shown in FIG. 9, the operation arm 140 includes a base portion 141 that is supported by the first shaft 120 so as not to rotate relative to the first shaft 120, and is radially outward from the base portion 141 with respect to the axis of the first shaft 120. And a first arm part 142 to which the connecting member 27 is connected.
In the present embodiment, the operation arm 140 is supported by the first shaft 120 so as not to rotate relative to the support wall 112 on the inner side in the body width direction.

  The first link mechanism 150 includes an operation side link 151 that extends radially outward from the second pedal boss 136 with reference to the axis of the first shaft 120, as shown in FIGS. A driven side link 152 extending radially outward with respect to the axis of the second shaft 125 in a state in which the second shaft 125 is not relatively rotatable around the axis, and one end side is connected to the operation side link 151 and the other. An end side has a connecting link 153 connected to the driven side link 152.

  In the present embodiment, the driven boss 126 is extrapolated so as not to rotate relative to the portion of the second shaft 125 located on the outer side in the body width direction from the second bearing boss 112b. The driven side link 152 is supported by the driven side boss 126.

  As shown in FIG. 9, the second link mechanism 160 has a cam pushing member 161 supported by the second shaft 125 so as not to be relatively rotatable, and a cam driven member 165 supported by the operation arm 140. doing.

  The cam pushing member 161 includes a base 162 that is supported by the second shaft 125 so as not to rotate relative to the second shaft 125, and a cam pushing portion that extends radially outward from the base 162 with respect to the axis of the second shaft 125. 163.

The cam follower 165 is supported by the second arm portion 143 of the operation arm 140.
That is, the operation arm 140 includes, in addition to the base portion 141 and the first arm portion 142, the second arm portion 143 that extends radially outward from the base portion 141 with respect to the axis of the first shaft 120. Have.
The second arm portion 143 is provided with a pivot shaft 144 extending in parallel with the first and second shafts 120 and 125, and the cam follower 165 is supported on the pivot shaft 144 so as to be relatively rotatable. Has been.

  The cam pushing portion 163 of the cam pushing member 161 rotates the operation arm 140 in the second direction around the axis of the first shaft 120 according to the rotation of the second shaft 125 in the first direction around the axis. The cam follower 165 is engaged so as to be moved.

In the present embodiment, as shown in FIG. 9, the second link mechanism 160 is used to maintain the engagement relationship between the cam pusher 163 and the cam follower 165 in addition to the constituent members. A biasing member 168 is provided.
The urging member 168 urges the cam pushing member 161 in the first direction around the axis of the second shaft 125 so that the cam pushing portion 163 engages with the cam driven member 165. .
In the present embodiment, as shown in FIG. 9, the biasing member 168 is a coil in which one end is locked to the pivot shaft 144 and the other end is locked to the cam pushing member 161. It is a spring.

  Preferably, as shown in FIG. 10, at least one of the one end side and the other end side of the connection link 153 corresponds to the plurality of positions at different distances from the axis of the first shaft 120 or the second shaft 125. The operation side link 151 or the driven side link 152 can be connected.

  According to such a configuration, an angle around the axis of the second shaft 125 with respect to an operation stroke of the second pedal 135 (an operation angle around the axis of the first shaft 120 of the second pedal 135), that is, the second The rotation angle of the cam pushing member 161 around the axis of the second shaft 125 with respect to the operation stroke of the pedal 135 can be easily changed, whereby the output of the HST 20 with respect to the operation stroke of the second pedal 135 is achieved. The rate of change can be changed.

  In FIG. 10, a plurality of (for example, three) mounting holes 152 a to 152 c having different distances from the axis of the second shaft 125 are formed in the driven side link 152. An end portion is selectively connected to the plurality of mounting holes 152a to 152c via pins 155.

Preferably, as shown in FIG. 10, a reinforcing plate 170 that connects the second pedal arm 137 and the operation side link 151 may be provided.
According to such a configuration, the connection relationship among the second pedal arm 137, the operation side link 151, and the second pedal boss 136 can be firmly maintained.

The HST speed change pedal assembly 100A having such a configuration operates as follows.
When the first pedal body 133 is pressed so that the first pedal 130 rotates in the first direction around the axis of the first shaft 120, the first shaft 120 rotates in the first direction around the axis. The operation arm 140 rotates in the first direction around the axis of the first shaft 120. When the operation arm 140 rotates in the first direction around the axis of the first shaft 120, the connecting member 27 moves to one side in the longitudinal direction (for example, the front side) (in the present embodiment, the control is performed). The output adjusting member is operated to one of the forward and reverse sides (for example, the forward rotation side) via the arm 26.

  On the other hand, when the second pedal body 138 is pressed so that the second pedal 135 rotates in the first direction around the axis of the first shaft 120, the second pedal 135 is connected via the first link mechanism 150. The shaft 125 rotates about the axis in the first direction. As the second shaft 125 rotates in the first direction around the axis line, the cam pushing member 161 rotates in the first direction around the axis line of the second shaft 125, thereby the cam driven member. The operating arm 140 rotates in the second direction around the axis of the first shaft 120 via the 165. By the rotation of the operation arm 140 in the second direction around the axis of the first shaft 120, the connecting member 27 moves to the other side in the longitudinal direction (for example, the rear side) (in the present embodiment, the control is performed). The output adjusting member is operated to the other side of the forward / reverse direction (for example, the reverse side) (via the arm 26).

Thus, in the pedal assembly 100A for HST speed change operation according to the present embodiment, both the first pedal 130 and the second pedal 135 that are operable in the first direction are attached to the first shaft 120. It is supported.
Therefore, the first and second pedal bodies 133 and 138 can be disposed close to each other without making the first and second pedal arms 132 and 137 longer.

  Furthermore, in the assembly 100A according to the present embodiment, as described above, the first pedal boss 131 and the second pedal boss 136 are displaced to the first shaft 120 in a state where the first pedal boss 131 and the second pedal boss 136 are displaced with respect to the axial direction of the first shaft 120. It is supported. Accordingly, the first and second pedal bodies 133 and 138 can be disposed close to each other without bending the first and second pedal arms 132 and 137 at a steep angle.

Embodiment 2
Hereinafter, another embodiment of the pedal assembly for HST speed change operation according to the present invention will be described with reference to the accompanying drawings.
11 and 12 are perspective views of the HST shift operation pedal assembly 100B according to the present embodiment as viewed from the outer side and the inner side in the body width direction.
FIG. 13 is an exploded perspective view of the assembly 100B.
In the figure, the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIGS. 11 to 13, in the assembly 100 </ b> B according to the present embodiment, the first pedal 130 is supported by the first shaft 120 so as to be relatively rotatable, and the second pedal 135 is The first shaft 120 is supported so as not to be relatively rotatable.
That is, the first pedal boss 131 is supported on the first shaft 120 so as to be relatively rotatable, and the second pedal boss 136 is supported on the first shaft 120 so as not to be relatively rotatable.

In the present embodiment, the first pedal boss 131 is supported by the first shaft 120 on the inner side in the body width direction from the support wall 112, while the second pedal boss 136 is supported by the support wall 112. Further, it is supported by the first shaft 120 on the outer side in the body width direction.
As described above, the first and second pedal bosses 131 and 136 are distributed and arranged on the inner side and the outer side in the width direction of the machine body with the support wall 112 interposed therebetween, so that the first and second pedals 130 and 135 are arranged. Support stabilization can be achieved.

As shown in FIGS. 11 to 13, the operation arm 140 is supported by the first pedal boss 131 so as not to be relatively rotatable.
In other words, in the present embodiment, when the first pedal boss 131 rotates in the first direction around the axis of the first shaft 120 based on the pressing operation to the first pedal body 133, the operation arm is accordingly operated. 140 rotates in the first direction around the axis of the first shaft 120.

In the present embodiment, the first link mechanism 150 operatively connects the inner ends of the first shaft 120 and the second shaft 125 in the body width direction.
That is, as shown in FIG. 12, the operation side link 151 is supported on the inner end of the first shaft 120 in the body width direction so as not to be relatively rotatable, and the driven side link 152 is supported in the body width direction of the second shaft 125. The inner end is supported so as not to rotate relative to the inner end.
With this configuration, when the first shaft 120 rotates in the first direction around the axis based on the pressing operation to the second pedal body 138, the second shaft 125 rotates around the axis via the first link mechanism 150. It rotates in the first direction.

  In the same manner as in the first embodiment, the second link mechanism 160 moves the operation arm 140 around the axis of the first shaft 120 according to the rotation in the first direction around the axis of the second shaft 125. It is configured to rotate in the direction.

  Also in the assembly 100B having such a configuration, as in the first embodiment, the first and second pedal arms 132 and 137 are not elongated and / or rapidly bent without being bent. The first and second pedal bodies 133 and 138 can be disposed close to each other.

20 HST
100A, 100B HST gear shifting pedal assembly 110 Bracket 112 Support wall 112a First bearing boss 112b Second bearing boss 115 Reinforcement stay 116 First vertical surface 117 Second vertical surface 118 Horizontal surface 120 First shaft 125 Second shaft 130 First Pedal 131 First pedal boss 132 First pedal arm 133 First pedal body 135 Second pedal 136 Second pedal boss 137 Second pedal arm 138 Second pedal body 140 Operation arm 150 First link mechanism 151 Operation side link 152 Driven side link 153 Connecting link 160 Second link mechanism

Claims (5)

A pedal assembly for HST speed change operation for operating an output adjustment member in HST capable of outputting rotational power continuously variable in both forward and reverse directions,
A bracket attached to an airframe forming member forming the airframe, the bracket having a support wall extending in the longitudinal direction of the airframe with a gap between the airframe forming member;
A first shaft supported by the support wall along the body width direction, the first shaft being rotatable in a first direction on one side and a second direction on the other side around the axis;
A second axis supported by the support wall in a state parallel to the first axis, wherein the second axis is rotatable around the axis in a first direction on one side and a second direction on the other side;
A first pedal supported on the first shaft so as not to rotate relative to the first shaft;
The first pedal is a second pedal supported on the first shaft so as to be relatively rotatable at a position displaced with respect to the axial direction of the first shaft;
An operation arm supported on the first shaft so as not to rotate relative to the first shaft, the operation arm being operatively connected to the output adjustment member via a connection member;
A first link mechanism for rotating the second shaft in the first direction and the second direction around the axis, respectively, in response to the pivoting movement of the second pedal in the first direction and the second direction around the axis of the first shaft; ,
And a second link mechanism for rotating the operation arm in a second direction around the axis of the first axis in response to rotation in the first direction around the axis of the second axis. Pedal assembly. The brackets are first and second bearing bosses respectively inserted into first and second bearing holes formed in the support wall, and extend inward and outward in the body width direction with the support wall interposed therebetween. Further comprising first and second bearing bosses;
The first and second shafts are supported by the first and second bearing bosses, respectively.
The first pedal includes a first pedal boss that is externally inserted into the first shaft so as not to rotate relative to the first shaft on the outer side in the body width direction from the first bearing boss, and a first end that is fixed to the first pedal boss. A pedal arm, and a first pedal body attached to a free end of the first pedal arm,
The second pedal includes a second pedal boss and a second pedal boss that is extrapolated relative to the first shaft at a position displaced from the first bearing boss and the first pedal boss in the axial direction of the first shaft. A second pedal arm having an end portion fixed to the second pedal boss, and a second pedal body attached to a free end portion of the second pedal arm;
2. The pedal assembly for HST speed change operation according to claim 1, wherein the operation arm is supported by the first shaft so as not to rotate relative to the first bearing boss on the inner side in the body width direction. The bracket further includes a reinforcing stay for connecting a portion of the first and second bearing bosses located on the outer side in the body width direction from the support wall,
The reinforcing stay includes a first vertical surface fixed to an outer surface of the first bearing boss opposite to the second bearing boss, and an outer surface of the second bearing boss opposite to the first bearing boss. A second vertical surface fixed to the surface, and a horizontal plane connecting the lower ends of the first and second vertical surfaces,
3. The pedal assembly for HST speed change operation according to claim 2, wherein inner ends of the first vertical surface, the second vertical surface, and the horizontal surface in the body width direction are fixed to an outer surface of the support wall. The first link mechanism includes an operation side link extending radially outward from the second pedal boss, and a radially outward direction with respect to the axis of the second shaft in a state in which the second shaft is not relatively rotatable about the axis. A driven link that extends to one end, and a connecting link having one end connected to the operating side link and the other end connected to the driven link.
At least one of the one end side and the other end side of the connection link can be connected to the corresponding operation side link or the driven side link at a plurality of positions having different distances from the axis of the first axis or the second axis. The pedal assembly for HST speed change operation according to claim 2 or 3, wherein the pedal assembly is provided. A pedal assembly for HST speed change operation for operating an output adjustment member in HST capable of outputting rotational power continuously variable in both forward and reverse directions,
A bracket attached to an airframe forming member forming the airframe, the bracket having a support wall extending in the longitudinal direction of the airframe with a gap between the airframe forming member;
A first shaft supported by the support wall along the body width direction, the first shaft being rotatable in a first direction on one side and a second direction on the other side around the axis;
A second axis supported by the support wall in a state parallel to the first axis, wherein the second axis is rotatable around the axis in a first direction on one side and a second direction on the other side;
A first pedal boss externally attached to the first shaft, a first pedal arm having a base end portion fixed to the first pedal boss, and a first pedal mounted on a free end portion of the first pedal arm; A first pedal including a main body;
The first pedal boss is a second pedal boss that is extrapolated to the first shaft so as not to rotate relative to the first shaft at a position displaced with respect to the axial direction of the first shaft, and a second pedal boss fixed to the second pedal boss. A second pedal including a pedal arm and a second pedal body mounted on a free end of the second pedal arm;
An operation arm supported by the first pedal boss so as not to rotate relative to the first pedal boss, the operation arm being operatively connected to the output adjustment member via a connection member;
A first link mechanism for rotating the second shaft in the first direction and the second direction around the axis, respectively, in response to a rotation operation in the first direction and the second direction around the axis of the first axis;
And a second link mechanism for rotating the operation arm in a second direction around the axis of the first axis in response to rotation in the first direction around the axis of the second axis. Pedal assembly.

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