JPS5843826A - Transmission structure in service car - Google Patents

Abstract

PURPOSE:To make a stepless speed change gear excellent in durability and capable of positively cutting off transmission, by providing an infinitely variable gear that can be changed over to rotate forward or backward and allow only the forward rotation of said gear to be transmitted to a forward and backward movement change-over mechanism by a one-way clutch. CONSTITUTION:The infinitely variable gear 12 that can be rotated forward and backward and consists of a belt type stepless speed change mechanism 14 and a planet gear mechanism 20 is provided, and the one-way clutch 13 is provided which transmits the forward rotation of the gear 12 to the forward and backward movement change- over mechanism 11. Thus, in the gear 12, since the transmission of the backward rotation of an output shaft 17 to the mechanism 11 can be cut off by the clutch 13, the relationship between the operation amount (x) of the stepless speed change gear 10 and the rotational speed (V) of the output shaft of the clutch, that is, the output shaft 22 of the stepless speed change gear 10 becomes as shown in the figure, and the backward rotation speed change operation region (a) for the gear 12 becomes the operation region for cutting the transmission. Therefore, if there is any backlash or the like in the interconnecting mechanism for the gear 10 and the operation device, the state of the cutting of the transmission of the gear 10 can be effected positively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a transmission mechanism from the original No. This invention relates to a transmission structure in an RR nesting wheel such as a combine harvester, in which the machine is placed in a state where the engine is positioned on the upper side of the transmission. .

Conventionally, continuously variable transmissions were equipped with hydraulic continuously variable transmission mechanisms or friction-type continuously variable transmission mechanisms using belts, etc.
Hydraulic stepless variable 3! ! According to ItII & Toga, the operating amount (1) of the hydraulic continuously variable transmission mechanism and the output shaft rotational speed (η) of the hydraulic continuously variable transmission mechanism have a relationship as shown in Fig. 4, and the output shaft Since there is only one point at which the rotational speed (ma) is set to 0, that is, the operating position where the transmission is cut off, the assembly of the linkage mechanism between the hydraulic continuously variable transmission mechanism and its operator is subject to errors, wear, etc. Due to unavoidable rattling, the hydraulic continuously variable transmission mechanism sometimes does not operate in the power-off state even if the operating tool is moved to the power-off position, and the friction-type continuously variable transmission mechanism using a belt In this case, the belt slips when the power is cut off and the belt is idling, causing premature wear of the belt, etc.
The drawback was that it lacked durability.

In view of the above-mentioned circumstances, it is an object of the present invention to provide a continuously variable FFI machine with excellent durability and, moreover, to be able to completely eliminate the need for transmission.

Next, 1 English example of the present invention f: Explanation based on the drawing direction 16+
, a puller w+61, a reaping device 1 (η) and a reaping section (9) equipped with a device 181 for conveying and supplying the reaped pellets to the threshing device i&+31 is connected to the elevator (fK). example) and before!, Harasuketo 11
) to the crawler traveling device 1112+, the transmission mechanism includes:
A continuously variable transmission uI capable of cutting off transmission and a forward/reverse switching mechanism ull incorporating a transmission switching mechanism are interposed with the continuously variable transmission uLl located on the upper side of the transmission. There is.

The continuously variable transmission U is a continuously variable transmission that can be switched between forward and reverse rotations.
Person table′! An i-speed device I (2) is provided, and only the forward rotation of this continuously variable transmission w@ is controlled by the forward/reverse switching mechanism (Ill
It is constructed by providing a one-way watch (β) that transmits the signal to the user.

The continuously variable gear ○ is provided with a belt-type continuously variable transmission mechanism (141″f: interlocked with the driving unit (11K), and also includes a sun gear 1 which is driven at a constant speed w11IJ by the driving unit (11).
151, a ring gear (2) driven in the same direction as the sun gear by an IQ belt type continuously variable transmission mechanism u41 at a speed within a range including a constant circumferential speed of the sun gear rotation;
A planetary tooth table structure Ca is provided with the output shaft (171 and the serial gear 01 supported via the carrier α81t) to the one-way clutch U, thereby making the ring gear uti+ higher than the sun gear curve. By driving the WJ at a speed of 6, the output shaft (171t) is rotated in the forward direction, and the ring gear is driven at a lower speed than the sun gear rotation. ing.

! The mowing R1 section (9) is configured to be driven via the belt type continuously variable transmission mechanism u41.

In the figure, (2) is the [fnive lever for the belt-type non-IK transmission mechanism ill.

According to the above #jt configuration, in the continuously variable transmission U, since the transmission of the reverse rotation of the output shaft surface to the forward/reverse switching mechanism uv is cut by the same direction clutch 0, the continuously variable transmission utll
The relationship between the operating cover (wings) and the one-way clutch (rotational speed CV of the output shaft of 13, that is, the output shaft of the continuously variable 2I1) for K is as shown in Fig. 3, and the continuously variable speed is The reverse rotation speed change operation range (&) for the device (2) is the operation range where transmission is cut off. Note that the dotted line in Figure A of fiPJ7 indicates the cutting speed.

In the above embodiment, the continuously variable transmission (b) was shown as consisting of a belt-type continuously variable transmission ring and a planetary gear mechanism. Let it be composed, but it's fine.

In summary, the transmission structure of the working vehicle according to the present invention is that of the ancient one, which is equipped with the continuously variable transmission (one part of which is a continuously variable transmission Ua capable of switching between forward and reverse rotations). , a same-direction clutch 0t- that transmits only the forward rotation of the continuously variable transmission aro to the forward/reverse switching mechanism tIIIK;
Since the present invention is characterized in that it is provided and configured, the forward rotation range of the continuously variable transmission @ can be used as the shift range when the work vehicle moves forward or backward by switching the front and rear switching * m all. In addition, since the wide reverse rotation range of the continuously variable transmission 11 (2) can be used as the transmission neutral range, even if there is some play or the like in the linkage mechanism between the continuously variable transmission 11 (2) and its operation I/D, It has now become possible to reliably bring about the transmission disconnection state of the continuously variable transmission-tlG, even if it increases with use over time. Moreover, as is clear from the examples, even if there is a friction type 1R speed mechanism t-m using a belt, the belt will not idle in the transmission disconnected state, so there will be less wear on the belt etc. As a whole, a transmission structure with excellent durability was obtained.

In addition to combine harvesters, the work tables to which the present invention is applied include tractors, crawling tables, rice transplanters, and the like.

[Brief explanation of the drawing]

One side shows the embodiment of the power transmission structure in the work unit according to the present invention, Figure 1 is a side view of the combine, Figure 2 is a transmission block diagram, and the third figure shows the relationship between operation sound and output rotation speed. The graph shown in FIG. 4 is a graph showing the relationship between the manipulated variable and the output rotational speed in the conventional example. (1)...Motor drive unit, (2)...Travelling device, (to)...Continuously variable transmission, uD...
Forward/forward switching mechanism, 0 position... Continuously variable transmission, (To)... One-way clutch, Round... Belt type continuously variable transmission mechanism, u=...・・・Sun gear, (to)・
...Ring gear, -...Iris tooth table mechanism. Figure 1

Claims (1)

[Scope of Claims] ■ The transmission mechanism from the original wJ section (1) to the constant travel device m (21) includes a continuously variable transmission capable of cutting off the transmission, a forward/reverse switching mechanism, and the continuously variable transmission mechanism. The transmission (2) is located on the upper side of the transmission.
In the transmission i1J structure for a working vehicle, which is interposed in a state where the continuously variable transmission is A one-way latch u3 is provided to transmit only the forward rotation of the forward/reverse switching mechanism αB to the forward/reverse switching mechanism αB. , a planetary system equipped with a belt-type stepless mosquito passing mechanism, a ring gear driven by this belt-type stepless mosquito passage mechanism, and a sun gear U driven from the storage part 1 (11K). From umbrella *mtn, composition 8
The construction of the work vehicle described in the patent claim #M, which is a construction of