JPH0334513Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of interest] This invention relates to a speed change operation device for a mobile agricultural machine, such as a walking type, in which two types of speed change mechanisms are operated by a single speed change operation lever. Moreover, it is designed to be easy to adjust the engagement state of each related member.

[Conventional technology]

Various gear shift operating devices are known that are configured to selectively operate two types of gear shifting mechanisms using a single gear shift operating lever, but all of them have complicated structures and are large in size. Because special care is required to hold the gear shift operating levers in their respective operating devices, when operating two types of gear shifting mechanisms using one operating lever, it is necessary to Operation fatigue has also become a major problem.

[Problem that the invention attempts to solve]

This idea has a simple configuration, and
It has been devised so that it is easy to operate to each operating position, and two types of gear shifting operations can be performed using one operating lever with less fatigue.

[Means for solving problems]

In order to solve the above problems, this invention takes the following technical measures.

That is, a plurality of first speed shifters 8 and 9 are arranged in the vertical direction, and each of the first speed change shifters 8 and 9
is provided with a plurality of engaging parts 8, 8, 9, 9, and is pivoted around the horizontal axis 2 so as to be swingable back and forth, and has a change arm 7 attached to one of the engaging parts.
can be selectively engaged and disengaged, and when in this engaged state, a shift operation member 5 configured to shift the first gear shifter in response to a rocking rotation operation around the vertical upright portion 5a. , the change arm 7 is selectively engaged and disengaged from the second gear shifter 12 provided in the vicinity of the first gear shifters 8 and 9, and one of the engaging portions in each of the first gear shifters 8 and 9. Gear shift operation member 5
Along with the above-mentioned back and forth rocking operation, the second speed shifter 1
2, the second shift operating mechanism 25 includes a holder 20 engaged with the shift operating member 5, and both front and rear legs of the holder 20. The fulcrum pin 17 is positioned between the portions 20a, 20a.
a shift arm 16 provided to shift the second speed shifter 12 in accordance with the swinging motion of the rotation;
The pivoting tip 16a of the shift arm 16 is clamped from the front and rear, respectively, so that the shift arm 16 is normally held at a certain operating position between the front and rear legs 20a, 20b and the pivoting tip 16a. This gear shift operating device for a mobile agricultural machine includes compression springs 21 and 22 provided and a positioning lock mechanism 30 provided to perform shift positioning of each shift arm 16.

[Example and operation]

Next, one embodiment of this invention will be described based on the drawings.

Fig. 1 shows a side view of the main part, Fig. 2 shows a plan view of the main part, Fig. 3 shows the main part as seen from arrow A in Fig. 2, Fig. 5 shows a side view of the entire mobile agricultural machine, and Fig. 6 5 are respectively shown in plan view, the hole 4a of the cylindrical portion 4 of the lever support 3 is pivotally supported on the horizontal shaft 2 so as to be swingable in the vertical direction with respect to the mission case 1 as the body of the mobile agricultural machine.
The upright portion 5a of the speed change operation member 5 is rotatably fitted to the erected portion 5a, and the fitting position is determined by the spring 6.
A change arm 7 is fixedly installed at the bottom of the.

A plurality of first speed shifters 8 and 9 of the first speed change mechanism
(not limited to two) are arranged in the vertical direction, and the first gear shifters 8 and 9 have arm portions 8a and 8, respectively.
b, 9a, 9b are installed in a staggered manner, and groove-shaped engaging portions 8, 8, 9 are provided in the respective arm portions.
a, 9, the change arm 7 can be selectively engaged with one of the shift operation members 5 by swinging the shift operation member 5 back and forth, and when the shift operation member 5 is rotated about the upright portion 5a, The first speed change shifter 8 or 9 engaged with the change arm 7 changes the speed of the first speed change mechanism via the respective shifter stays 10 and 11. The second transmission shifter 12 protruding outward from the mission case 1 is moved to the front and back directions in FIG. 1 (up and down in FIG. When the shift operation member 5 is to be operated to change gears and the shift operation member 5 is operated to swing back and forth so that the change arm 7 engages and disengages the adjacent engaging portions 8, 9 or 8, 9, respectively, The second speed shifter 12 does not perform a speed change operation, but the speed change operation member 5 is rotated back and forth so that the engaging portions 8, 8 or 9, 9 in the respective first speed shifters 8, 9 engage and disengage. A second speed change operation mechanism 13 is provided so that the second speed change shifter 12 is operated to change speed when the movement is performed.

To explain the second shift operation mechanism 13, a vertical guide 1 that is long in the front-rear direction (left-right direction in FIG. 2)
4a is attached to the transmission case 1 with bolts 15, 15, and the fulcrum pin 17 is inserted into the middle part of the shift arm 16 and fixed.
is pivotally supported to the transmission case 1, and the connecting block 1 is connected to one rotating tip 16a of the shift arm 16.
Both front and rear legs 20a, 20a of a holder 20 shaped in side view are attached to pins 19 which are loosely inserted into the connecting block 18 in the left-right direction in FIG.
Attach the connecting block 18 and both front and rear legs 20.
compression springs 21 and 22 are tensioned between the pins 18a and 20a, the pin portion 18a is loosely inserted into the elongated hole 14b of the receiving plate 14, and the upright portion 5a of the speed change operation member 5 is loosely inserted into the hole 20b of the holder 20. The pin 24 at the rotating tip of the lever 23 fixed to the fulcrum pin 17 is engaged with the shift gear 26 of the second transmission mechanism 25 illustrated in FIG. The gear portion 26a or 26b of the second speed shifter 12,
The lever 23 is selectively engaged with the swinging movement of the lever 23, and when the gear shift operation member 5 is left in place without applying any manual force, the compression springs 21 and 22 are not balanced as shown in FIG. Depending on the operation, the gear section 26
a, 27a are engaged, and the ball 29, which is fitted into the shift arm 16 and urged in the protruding direction by the spring 28, engages with one positioning hole 14c of the receiving plate 14, and this second In the state shown in the figure, when the shift operation member 5 is moved slightly to the left until it comes into contact with the left side edge of the hole 20b, the change arm 7 engages with the engaging portions 8 to 9; , the gear shift operation member 5 is moved largely to the left so that the pin portion 18a is inserted into the elongated hole 14b of the receiving plate 14.
When the left side compression spring 21 is compressed, the fulcrum pin 17
The shift arm 16 and the lever 23 rotate clockwise in FIG.
The ball 29 is now engaged with one of the positioning holes 14b, while the change arm 7 is engaged with the engaging portions 8 to 9.
A or from the engaging portion 8 to 9, and is provided with a positioning lock mechanism 30 consisting of a ball 29 biased by a spring 29 and positioning holes 14c and 14d.

[Effect of idea]

The gear shift operating device for a mobile agricultural machine according to this invention is constructed as described above, and the shift arm 16 moves the second gear shifter 12 by swinging the gear shift operating member 5 largely in the front and back direction.
By performing a switching operation to each shift position, and in each switching posture of the second shift shifter 12, the shift operation member 5 is swung and rotated around its upright portion 5a. The first speed change shifters 8 and 9 are each operated to change the speed, and thus two types of speed change operations are performed by the single speed change operation member 5.

In the second gear shift operation, the operation to each gear shift position can be performed reliably and easily by the action of the front and rear compression springs 21, 22 and the positioning lock mechanism 30. Moreover, its configuration is such that the shift arm 16, the holder 2
0, a simple configuration mainly consisting of compression springs 21, 22, etc. could be achieved.

[Brief explanation of drawings]

The figures show one embodiment of this invention, in which Fig. 1 is a side view of the main part, Fig. 2 is a plan view of the main part of Fig. 1, Fig. 3 is a view of the main part as seen from arrow A in Fig. 2, and Fig. 4 The figure is a view from arrow B in Figure 2, Figure 5 is a side view of the entire mobile agricultural machine, and Figure 6 is a view from the direction of arrow B in Figure 2.
FIG. Symbol explanation, 2...horizontal axis, 5...speed change operation member,
5a... Upright portion, 8, 9... First gear shifter, 7
...Change arm, 8, 8, 9, 9...
...Engaging portion, 16...Shift arm, 16a...Rotating tip, 17...Fully pin, 20...Holder,
20a... Front and rear legs, 21, 22... Compression spring, 13... Second speed change operation mechanism, 12... Second speed change shifter, 30... Positioning lock mechanism.

Claims (1)

[Scope of utility model registration request] A plurality of first speed shifters arranged in the vertical direction, each first speed change shifter having a plurality of engaging portions, and a plurality of first speed shifters that are pivotally supported around a horizontal axis so as to be swingable back and forth. The change arm can be selectively engaged with or disengaged from one of the engaging parts, and when in this engaged state, the first gear shifter is shifted by swinging and rotating operation around the vertically erected part. The change arm is selectively engaged and disengaged from one of the engaging portions in each of the gear shift operation member configured to do so, the second gear shifter provided in the vicinity of the first gear shifter, and the first gear shifter. In the speed change operation device, the second speed change operation mechanism includes a second speed change operation mechanism that is provided so that the second speed shifter can be shifted in accordance with the fore-aft rocking operation of the speed change operation member. a holder engaged with the holder; a shift arm positioned between the front and rear legs of the holder so as to shift the second speed shifter as the holder swings around a fulcrum pin; and rotation of the shift arm. Compression springs are provided between the front and rear legs and the pivoting tip so that the shift arm is held at a certain operating position under normal conditions by pinching the shifting tip from the front and back, respectively, and each of the shift arms. A gear shift operating device for a mobile agricultural machine, comprising a positioning lock mechanism provided to perform shift positioning.