JPS6244825Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a forward/reverse switching device for a forward/reverse vehicle, and the present invention relates to a forward/reverse switching device for a forward/reverse vehicle. When driving in either position, the same vehicle speed can be obtained in both forward and backward directions, and the vehicle can also move forward or backward in the direction in which the switching lever is operated.

2. Description of the Related Art For vehicles such as tractors, vehicles have been proposed in which operating parts such as a driver's seat and a steering wheel can be changed between forward and rearward positions with respect to the vehicle body due to the work equipment attached to the vehicle body. However, the conventional transmissions in this type of vehicle are designed to have, for example, 16 forward speeds and 4 reverse speeds when the vehicle is in the normal forward facing position. , 4 forward speeds and 16 reverse speeds, which had the disadvantage that there were few forward gears and it was not possible to obtain a forward speed suitable for work.

The purpose of this invention is to solve these conventional problems, and its feature is that it is a forward and backward moving type in which the driving section can be changed between forward and backward positions. In a vehicle, during the driving system,
forward gear trains 46, 48a and reverse gear train 47,
49, 48b and a selection means 50 for selecting these.
A switching lever 53 for operating 0 is provided so as to be movable back and forth, and in conjunction with the operation of this switching lever 53,
The selection means 50 selects the forward gear trains 46 and 4 so that the direction of travel of the vehicle coincides with the operating direction of the switching lever 53.
8a and the reverse gear train 47, 49, 48b, the switching lever 53 and the selection means 50 are interlocked.

The present invention will now be described in detail with reference to the illustrated embodiment. In FIG. 1, reference numeral 1 denotes a double clutch device disposed within a clutch housing, comprising a running clutch 2 and a PTO clutch 3. Reference numeral 4 denotes a traveling main shaft that is interlocked with the traveling clutch 2, and 5 is a PTO main shaft that is interlocked with the PTO clutch 3. These main shafts 4 and 5 are fitted in the form of an inner and outer double shaft, and are also connected to the partition wall between the clutch housing and the transmission case. 6 and is rotatably mounted on the shaft. Traveling spindle 4
A first traveling power transmission shaft 11 and a first PTO power transmission shaft 12 are mounted in parallel above and below via bearings 7, 8, 9, and 10, respectively, and a second traveling power transmission shaft 11 is mounted on the rear axis of the first traveling power transmission shaft 11. .The third traveling transmission shafts 13 and 14 are bearings 15,
The fourth traveling power transmission shaft 20 is mounted below the third traveling power transmission shaft 14 and on the rear axis of the traveling main shaft 4 through bearings 18 and 19.
is mounted on a shaft, and its fourth traveling transmission shaft 20 is interlocked with a differential gear via a bevel pinion 21. No.
On the rear axis of the 1PTO transmission shaft 12 are the second and second
4PTO transmission shafts 22, 23 are bearings 24, 25, 26
The main traveling shaft 4 and the fourth traveling power transmission shaft 20 are connected via a bearing 27 or the like.
A 3PTO transmission shaft 28 is mounted on a shaft. 29 is a main transmission, gears 30, 31, 3 on the main shaft 4;
2, 33, and gears 34, 3 fitted on the second traveling transmission shaft 11 so as to be freely rotatable so as to be always engaged therewith.
5, 36, 37, shifters 38, 39, etc. 40 is a creep transmission device, which includes a gear 41 fixedly installed on the first traveling transmission shaft 11, and a large diameter portion 42.
3rd PTO transmission shaft 28 to engage gear 41
A creep gear 42 is fitted on the top so that it can rotate freely,
The shift gear 43 is spline-fitted onto the second traveling power transmission shaft 13 and can be selectively fitted into and removed from the first traveling power transmission shaft 11 and the small diameter portion 42b of the creep gear 42. 44 is a forward/reverse switching mechanism, which includes a spline boss 45 and a gear 46 fixed on the third traveling transmission shaft 14 , a gear 47 loosely fitted on the third traveling transmission shaft 14 , and a gear 47 on the fourth traveling transmission shaft 20 . A gear 48 that is loosely fitted and has a large diameter portion 48a meshing with the gear 46, and an intermediate gear 4 that meshes with the gear 47 and the small diameter portion 48b of the gear 48.
9. The shifter 50 is spline-fitted onto the second travel transmission shaft 13 and has an engaging portion 50a that can be selectively fitted into and removed from the spline boss 45 and the gear 47. Note that the gear 46 and the large diameter portion 48a make the forward gear train
7, 49 and the small diameter portion 48b, the reverse gear train is
Further, the shifter 50 constitutes a selection means. A shift lever 51 is engaged with the shifter 50, and the shift lever 51 is fixed to a rotation shaft 52 inserted and supported on the side wall of the transmission case. is connected to. As shown in FIG. 2, the switching lever 53 is movable back and forth around the rotation shaft 52 along the guide groove 55 of the guide plate 54, and the operating direction of the switching lever 53 is made to match the switching direction of the forward/reverse switching mechanism 44. There is. Arrows 57 and 58 are displayed on the name plate 56 of the guide plate 54 in the front and rear directions. Reference numeral 59 denotes a sub-transmission device, which includes gears 61 and 62 connected to a key 60 on the fourth traveling transmission shaft 20, a gear 63 fitted on the third traveling transmission shaft 14 so as to freely rotate so as to engage with the gear 62; It is comprised of a shift gear 64 that is spline-fitted onto the third traveling power transmission shaft 14 so as to be able to be freely fitted into and removed from the gears 61 and 63. 65 is a first gear mechanism, which includes a gear 66 fixed to the rear end of the PTO main shaft 5, and a first gear mechanism that engages with this gear 66.
It consists of a gear 67 fitted onto the 1PTO transmission shaft 12 so as to freely rotate. A second gear mechanism 68 is composed of a gear 31 on the traveling main shaft 4 and a gear 69 fitted on the first PTO transmission shaft 12 so as to be freely rotatable so as to mesh with the gear 31. The reduction ratio of the first and second gear mechanisms 65, 67 is slightly larger on the first gear mechanism 65 side, and each of the gear mechanisms 65, 66
The gears 67 and 69 are shifted to the first position by the shifter 70.
It can be selectively coupled to the 1PTO transmission shaft 12. 71 is a PTO transmission, and the third PTO transmission shaft 28
The gears 72 and 73 fixedly fixed thereon, the gear 74 fixedly fixed on the second PTO transmission shaft 22 to engage with the gear 73, and the first PTO to be selectively engaged with and removed from the gear 72 and the second PTO transmission shaft 22. It consists of a shift gear 75 spline-fitted to the transmission shaft 12.

In the above configuration, power from the engine is transmitted to the traveling clutch 2, the traveling main shaft 4, the main transmission 29, the first traveling transmission shaft 11, the creep transmission 40, the second
Transmission is transmitted from the differential device to the rear wheels via the traveling transmission shaft 13, the forward/reverse switching mechanism 44, the third traveling transmission shaft 14, the auxiliary transmission 59, and the fourth traveling transmission shaft 20, and the main transmission 29 transmits the transmission to the rear wheels. 38, 39
By operating the shift gears 43 and 64, the creep transmission device 40 and the sub-transmission device 59 can perform a two-speed shift.

When switching between forward and backward movement, if the switching lever 53 is operated in the direction of the arrow 57 on the nameplate 56, the shifter 5
0 slides in the direction of the arrow a, and the engaging part 50a engages with the spline boss part 45, so power is transmitted from the second traveling power transmission shaft 12 to the third traveling power transmission shaft 14 via the spline boss 45, and the vehicle The vehicle travels in the same direction as the arrow 57 on the nameplate 56. Also, the switching lever 53
When the shifter 50 is operated in the direction of the arrow 58, the shifter 50 moves to b.
It slides in the direction of the arrow and engages the gear 47, so
The power of the second traveling power transmission shaft 13 is transmitted to the third traveling power transmission shaft 14 via the gear 47, the intermediate gear 49, and the gears 48, 46, and this third traveling power transmission shaft 14 rotates in the opposite direction to the above-mentioned direction. The vehicle travels in the same direction as arrow 58. Therefore, since the operating direction of the switching lever 53 and the traveling direction of the vehicle due to the switching operation of the forward/reverse switching mechanism 44 match, even when the posture of the driver's seat, steering wheel, etc. This prevents erroneous operations such as mistaking the wrong one, and it is possible to shift up to 16 speeds in both forward and reverse directions, allowing you to obtain the vehicle speed suitable for your work.

On the other hand, when driving a working machine that requires double clutch operation, the shifter 70 is engaged with the gear 67 and the first gear mechanism 65 is connected to the first PTO transmission shaft 12. Then the power from the engine is
From the PTO clutch 3 to the PTO main shaft 5, the first gear mechanism 65, the first PTO transmission shaft 12, and the PTO transmission 7
1. The power is transmitted from the PTO shaft to the work machine via the second PTO transmission shaft 22 and the fourth PTO transmission shaft 23. In this case, the PTO transmission 71 allows two-speed shifting, and the reduction ratio of the first gear mechanism 65 is as follows.
It is designed so that rotations of approximately 540rpm and 1000rpm can be obtained by switching the PTO transmission 71 when the engine is at full rotation. This is because the PTO rotation is generally set at 5401000 rpm for work that requires double clutch operation.

When driving a work machine that does not require double clutch operation, the shifter 70 is engaged with the gear 69 and the main shaft 4 is connected via the second gear mechanism 67.
Power is transmitted from the PTO transmission shaft 12 to the first PTO transmission shaft 12. Therefore, since the PTO system can be switched on and off using the traveling clutch 2, the pedal stroke can be reduced, making the operation very easy. In this case, the second gear mechanism 67
The reduction ratio of PTO rotation is 800r.pm and 1300r.pm.
It is designed to be of a certain degree.

The forward/reverse switching mechanism 44 has a shift gear 76 spline-fitted onto the second traveling power transmission shaft 13 as shown in FIG. It may also be removable. However, in this case,
The rotation shaft 52 supporting the switching lever 53 needs to be arranged above the travel transmission shafts 13 and 14. Furthermore, if the first and second gear mechanisms 65 and 67 do not require a shift, and only 540rpm and 1000rpm are required, the gear 69 may be removed.

This invention has a forward/reverse switching mechanism in the drive system, so whether you drive forward or backward, you can obtain the same vehicle speed both forward and backward, and always maintain the vehicle speed that is appropriate for your work. It is possible to choose. In addition, a forward/reverse switching mechanism having a forward gear train, a reverse gear train, and a selection means for selecting these is provided in the traveling system, and a switching lever for operating the selection means is provided so as to be movable back and forth. The switching lever and the selection means are interlocked so that the selection means selects the forward gear train and the reverse gear train in conjunction with the operation of the switching lever so that the direction of travel of the vehicle coincides with the operating direction of the switching lever. Even though the position of the driving part is changed back and forth, the vehicle travels in the direction in which the switching lever is operated, so there is no chance of making a mistake in forward or backward operation.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a transmission showing one embodiment of the present invention, FIG. 2 is a perspective view of a switching lever portion, and FIG. 3 is a configuration diagram showing another embodiment. 1...Double clutch device, 2...Traveling clutch, 3...PTO clutch, 4...Travel main shaft, 5
...PTO main shaft, 11, 13, 14, 20... Travel transmission shaft, 12, 22, 23, 28... PTO transmission shaft, 29... Main transmission, 40... Creep transmission, 44... Forward/forward movement Switching mechanism, 53... Switching lever, 59... Sub-transmission device, 65... First gear mechanism, 67... Second gear mechanism, 71...
PTO transmission.

Claims (1)

[Scope of utility model registration request] In a forward-reverse type vehicle in which the driving section can be changed between a forward position and a backward position, forward gear trains 46, 48a and reverse gear trains 47, 49, 4 are provided in the driving system.
8b and a selection means 50 for selecting these, a forward/reverse switching mechanism 44 is provided, and a switching lever 53 for operating the selection means 50 is provided so as to be freely movable back and forth.
In conjunction with the operation of the switching lever 53, the selection means 50 selects the forward gear trains 46, 48a and the reverse gear trains 47, 49, 48b so that the vehicle running direction matches the operating direction of the switching lever 53. A forward/reverse switching device for a forward/reverse type vehicle, characterized in that the switching lever 53 and the selection means 50 are interlocked.