JPS5930747Y2 - Operation lever device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an operating lever device used in a tractor transmission, which enables a combination of a first transmission mechanism and a second transmission mechanism to be changed using a single transmission lever, and which combines the first and second transmission mechanisms. The shift amount on the second transmission mechanism side can be made equal in both directions even when changing gears, and its feature is that the first engagement body and the second engagement body are swingable around the support shaft. and a shift fork that operates the first transmission mechanism and the first engaging body are interlocked and connected via an interlocking mechanism, and the shift fork that operates the second transmission mechanism is interlocked with the shift fork that operates the second transmission mechanism. A swinging member is pivotally supported by a horizontal shaft, and the swinging member and a second engaging body are interlocked and connected by a connecting pin on a line connecting the support shaft and the horizontal shaft, and the first engaging body is connected to a gear shifting member. A first engaging portion is provided with which the lever engages in a detachable manner, and when the first engaging body is operated by the shift lever to two shift positions of the first transmission mechanism, the first engaging member is engaged with the first engaging member in a detachable manner. The second engaging body is provided with two second retaining parts that correspond to the corresponding parts and are removably engaged with the speed change lever.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.
The figure is a configuration diagram illustrating the power system of a tractor. In the figure, 1 is an engine, 2 is a clutch, and 3 is a main shaft. Above and below this main shaft 3 are a traveling main transmission mechanism 4 and a PTO transmission mechanism 5. is provided.

The main transmission mechanism 4 can be operated to change gears by a main transmission lever arranged in the intermediate section of the tractor body, and the rear stage of the main transmission mechanism 4 includes a creep transmission mechanism (first transmission mechanism) 6 and an auxiliary transmission mechanism (first transmission mechanism). 2 transmission mechanism) T1 differential device 8 etc. are provided respectively.

The creep transmission mechanism 6 includes a sliding gear 9, which is slidable in the axial direction to connect/disconnect the transmission shaft 10.11, and can be freely engaged with and disengaged from the creep gear 12.

The sub-transmission mechanism 7 is of a selective engagement type and includes a sliding gear 13.

The PTO transmission 5 is operatively connected to the PTO shaft 14.

15 is a reverse system, which can be operated by the main shift lever.

The sliding gears 9, 13 can be changed in speed by a speed change operation device located near the fender 15 on the side of the driver's seat, and the speed change operation device is constructed as shown in FIGS. 2 to 4. There is.

That is, in FIGS. 2 to 4, reference numeral 16 is a cover plate that covers the lower part of the driver's seat between the left and right fenders 15, and a support shaft 18 is attached to this cover plate 16 via a U-shaped support frame 17.
is provided in the horizontal direction.

19 is a first holding body interlocked with the creep transmission mechanism 6; 20;
is a second engaging body that is interlocked with the sub-transmission mechanism 7, and these image body combinations 19 and 20 have a cylindrical member 21 and 22 approximately at the center in the vertical direction.
It is supported by the support shaft 18 via its cylindrical members 21 and 22 so as to be rotatable back and forth.

Reference numeral 23 denotes a first shift lever that engages with the sliding gear 9 of the creep speed change mechanism 6, and is provided at the tip of a swinging arm 25 fixed to the lower end of the vertical shaft 24. 24
is rotatably inserted into a transmission stand 27 placed on a transmission case 26, and has a swing arm 28 at its upper end.
The swing arm 28 is connected to the lower end of the first engaging body 19 via a first connecting rod 29.

30 is a second shift fork that engages with the sliding gear 13 of the sub-transmission mechanism 7, and is slidably supported by the fork shaft 31 in the front-rear direction, and is attached to the inner end of the horizontal shaft 32 inserted and supported in the transmission case 26. It can be slid by a shift lever 57.

The horizontal shaft 32 has a swinging member 33 at its outer end, and the swinging member 3
A bifurcated portion 34 is formed at the upper end of 3.

The two-pronged portion 34 has a second engaging body (also serves as a swinging member) 20
A connecting pin 35 protruding from the lower end of is slidably fitted.

The connecting pin 35 is arranged on a line segment connecting the support shaft 18 and the horizontal axis 32.

36 is a shift lever for cooperatively operating the creep transmission mechanism 6 and the auxiliary transmission mechanism 7, and has an inverted U-shaped mounting portion l# at the lower end.
37, the mounting member 37 is swingably supported by a support member 38 rotatably fitted around the support shaft 18 by a pivot pin 39 in a direction perpendicular to the support shaft 18, Therefore, the speed change lever 36 is swingable back and forth and left and right.

In the 7i1-1 support member 38, the gear shift lever 36 is connected to the engagement body 19.
．． A cylindrical member 41 is fixed by a roll pin 40 between the cylindrical member 21 and the ox octopus support member 38, which is arranged between the cylindrical members 21 and 22 and pressed.

The gear shift lever 36 can be selectively engaged with and disengaged from each of the engaging bodies 19 and 20, and the first engaging body 19 has a first engaging body 19 at its center in the width direction.
A retaining portion 42 is formed, and the second engaging body 20 has a first retaining portion 42.
Two second engaging portions 43 and 44 are formed to correspond to the first engaging portion 42 when the engaging body 19 is shifted in the front-rear direction at high speed and low speed positions H and Lt. .

The second engaging portions 43 and 44 are formed so that one side is deep and the other side is shallow.

Reference numeral 45 denotes a shift guide plate, which is attached to the inner surface of the fender 15 on the side of the driver's seat.
5, a first shift guide groove 46 for guiding the shift lever 36 engaged with the first engaging portion 42 in the front-rear direction, and high-speed and Selection guide groove 47 formed laterally outward from low speed positions H and L
．． 48, and a second shift guide groove 49.50 formed in communication with the outer end of each selection guide groove 47.48 to guide the shift lever 36 engaged with the second engagement portion 43.44 in the front-rear direction. and both ends of the second gear change guide groove 49.50 are located at high speed and low speed positions HH, HL, LH, LL on the second engaging body 20 side.
It is said that

The length of the button selection guide grooves 47 and 48 is determined by the length of the second engaging portion 43.
With this configuration, the length of the speed change guide plate 450 in the longitudinal direction can be shortened.

Reference numeral 51 designates a locking member for locking the first engaging body 19 in a non-swiveling manner, and is pivotally supported by a roll pin 40 via a U-shaped mounting member 52 so as to be swingable. When the first engaging body 19 is located at the high speed and low speed positions H and L, the engaging hole 53 formed in the first engaging body 19
．． The mounting member 37.
A coil spring 55 interposed between the locks 52 and 52 urges the lock release direction.

Reference numeral 56 is a suppressing member, which controls the speed change lever 36 from the second holding body 2.
This is for pressing the lock member 51 against the coil spring 55 to engage with the engagement holes 53 and 54 when the second engagement portion 43 and 44 of the second engagement portion 43 and 54 are engaged. Member 37
It extends one end downward and outward, and is attached to the extended end in the front-rear direction.

Next, the effect will be explained.

Now, assuming that the shift lever 36 is located at the center of the first shift guide groove 46, at this time the shift lever 36 engages with the first engaging portion 42 of the first engaging body 19, and the lock member 5
1 is in an unlocked state, separated from the first engaging body 19, and the creep transmission mechanism 6 is not connected to either high or low speed, and is in a neutral state.

Therefore, move the shift lever 36 along the first shift guide groove 46.
When operated in the direction of the arrow, the first engaging body 19 rotates around the support shaft 18 in the direction of the arrow b, and presses the first connecting rod 29 forward, so that the swing arm 28, the vertical shaft 24, and the swing The sliding gear 9 is connected to the sliding gear 9 via the moving arm 25, the first shift fork 23, etc.
slides forward.

Then, the shift lever 36 reaches the high speed position H1 at the rear end of the first shift guide groove 46, and the sliding gear 9 reaches the shift shaft 10.1.
1 is directly connected, and the creep transmission mechanism 6 is in a high speed state.

When the gear shift lever 36 is operated to the high speed position H, the first retaining portion 42 of the first engaging body 19 engages the second engaging portion 4 of the second retaining body 20.
3, so when the shift lever 36 is operated in the direction of arrow C along the selection guide groove 47, the shift lever 36 rotates around the pivot pin 39 and disengages from the first engaging portion 42. ,
It engages with the second engaging portion 43 .

On the other hand, when operated to the high speed position H, the engagement hole 53 is in a state facing the locking member 51 due to the rotation of the first engagement body 19, so that it is linked to the operation of the shift lever 36 in the direction of arrow C. The suppressing member 56 presses the locking member 51, and the locking member 51 engages with the engagement hole 53 to lock the first holder 19 unrotatably.

After the shift lever 36 is engaged with the second engagement portion 43 of the second holding body 20, when it is operated along the second shift guide groove 49 in the direction of arrow d to the high speed position HH, the second holding body 20 rotates around the pivot shaft 18 in the direction of arrow B, the swinging member 33 rotates around the horizontal shaft 32 in the direction of arrow C via the connecting pin 35, and the horizontal shaft 32 and the second shift The sliding gear 13 slides rearward via the fork 30 and the like, and the sub-transmission mechanism 7 enters a high speed state.

By the way, if the connecting pin 35 is on the line connecting the support shaft 18 and the horizontal shaft 32, even when the shift lever 36 is operated to the low speed position HL, the swinging member 33 will swing by the same angle as when operating the high speed position HH. Therefore, the sliding amount of the sliding gear 13 can be equalized in the front and rear.

Even when the shift lever 36 is operated to the high speed position HH, the suppressing member 56 contacts and slides on the locking member 51, so that the locking member 51 remains engaged with the engaging hole 53 of the first engaging body 19. During this period, the first engaging body 19 is completely unrotatable.
It is.

When the shift lever 36 is disengaged from the second engaging portion 43 of the second holding body 20 and engaged with the first engaging portion 42 of the first engaging body 19, the f around the pivot pin 39 of the mounting member 37 is The rotation in the direction of the arrow compresses the upper side of the coil spring 55, so the lock 151 rotates around the roll pin 40 and disengages from the engagement hole 53 of the first engagement body 19.
Dissolve 9 locks.

Therefore, after the shift lever 36 is engaged with the first engagement portion 42 of the first engagement body 19, the shift lever 36 is immediately operated along the first shift guide groove 46, and the first engagement body 19 is rotated. I can make it work.

In addition, in the embodiment, although the present invention is exemplified as being applied to a speed change operation device, it is not limited to this, and the present invention can be widely used for operation lever devices in general.

As described in detail in the embodiments above, in the present invention, the first engaging body 19 that is interlocked with the first transmission mechanism 6 and the second engaging body 20 that is interlocked with the second transmission mechanism 7 are connected to each other when the speed change lever 36 is While the first holding body 19 is provided so as to be swingable around the support shaft 18,
A first engagement portion 42 is provided with which the gear shift lever 36 is removably engaged, and when the first engagement body 16 is operated by the gear shift lever 36 to two shift positions of the first transmission mechanism 6, the first engagement portion 42 is provided. Combine 1
Since the second engaging body 20 is provided with two second retaining portions 43° and 44 which correspond to the first engaging portions 42 of 9 and removably engage with the shift lever 36, one shift lever is provided. By operating the lever 36, the first transmission mechanism 6 and the second transmission mechanism 7 can be selectively operated, and it is possible to perform a combination of the two transmission mechanisms. It is easy to operate and has a simple structure.

In order to enable a combined speed change, the second engaging body 20 requires two second engaging portions 43 and 44 corresponding to each shifting position of the first holding body 19, and Although the engagement posture of the gear shift lever 36 with respect to the combination 20 changes, the swinging member 33 interlocked with the second transmission mechanism 7 and the second holding body 20 are connected to the horizontal shaft 32 and the support shaft 18 that pivotally support the swinging member 33. Since they are interlocked and connected by the connecting pin 35 on the line segment connecting them, the shift amount on the second transmission mechanism 7 side can always be the same in both directions regardless of changes in the attitude of the transmission lever 36, and its design is extremely It becomes easier.

[Brief explanation of drawings]

The drawings illustrate one embodiment of the present invention, in which Fig. 1 shows the components of the power system of the tractor, Fig. 2 is a side view of the operating system, Fig. 3 is a rear view of the same, Fig. 4 is a perspective view of the same, FIG. 5 is a plan view of the speed change guide plate. 6... Creep transmission mechanism, 7... Sub-transmission mechanism, 18
... Support shaft, 19... First holding body, 20... Second engaging body, 32... Horizontal shaft, 33... Swinging member, 35... Connection pin, 36... gear lever.

Claims (1)

[Scope of utility model registration request] A first engaging body 19 and a second engaging body 20, which are swingable around the support shaft 18, are provided facing each other with the gear change lever 36 in between.
The shift fork 23 that operates the transmission mechanism 6 and the first engaging body 19 are interlocked and connected via the interlocking mechanism 29, and the swinging member 33 that is interlocked with the shift fork 30 that operates the second transmission mechanism 7 is connected by the horizontal shaft 32. This swinging member 33 and the second
A first engagement in which the engaging body 20 is interlocked and connected by a connecting pin 35 on a line connecting the support shaft 18 and the horizontal axis 32, and the gear shift lever 36 is removably engaged with the first holding body 19. A section 42 is provided,
The first engagement body 19 is moved to the first speed change mechanism 602 by the speed change lever 36.
When the shift lever 36 is operated to one of the two shift positions, the two second engagement portions 43 and 44, which are removably engaged with the shift lever 36, correspond to the first engagement portion 42 of the first engagement body 19. 2. An operating lever device characterized in that it is provided on an engaging body 20.