JPS6316881Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a valve structure including a rotary type valve body and a pressure receiving piston for an accumulator.

A conventional valve structure will be explained based on FIG. 5 of the drawings. FIG. 5 schematically shows a conventional valve structure, in which one valve casing 028
A storage chamber 026 for the rotary valve body and a storage chamber 027 for the pressure receiving piston for the accumulator are arranged side by side with their ends open.
27 openings each with two lids 029A and 029B.
Each block was blocked separately.

The problem that the present invention attempts to solve is to improve productivity. That is, in the conventional structure, each of the open ends of the two storage chambers was closed with a lid, so the sealing area was large and the sealing work was troublesome. It is possible to replace the two lids with an integrated large lid, but in order to reliably close both storage chambers with this large lid, the machining accuracy of the sliding surfaces of both must be improved. This created a new problem. An object of the present invention is to provide a valve structure that can reduce the sealing area of the valve structure through rational innovation and improve productivity.

The structural feature of the present invention devised to solve the problem is that a storage chamber for the valve body is formed in the valve casing with an open end, and the lid of the valve casing has an open end. The housing chamber for the piston is formed in a state where the two chambers are open, and the lid body is fixed to the valve casing with the end openings of these two chambers brought into contact with each other.

With the above characteristic configuration, the present invention produces the following effects. In other words, with the above configuration, the seal structure can be shared for each of the valve body storage chamber and the piston storage chamber, and the seal area can be reduced. By simply fixing the lid body with a small seal area to the valve casing, two seal structures can be shared. You can complete the seal on the storage room. Therefore, it is possible to obtain the effect that the productivity can be significantly improved compared to the conventional method.

Embodiments of the present invention will be described below based on illustrative drawings.

As shown in FIG. 1, left and right running crawlers 1a,
1b, the front part of this machine equipped with a threshing device 2, etc. is equipped with a stem culm pulling device 3, a cutting blade 4 for cutting the stem culm stock base, a device 5 for conveying the harvested stem culm to the rear threshing device 2, etc. The reaping processing section is connected, and as the aircraft advances,
The system is configured to automatically and continuously perform the operations of lifting and reaping the stem culms planted in the field and sequentially threshing the harvested stem culms.

As shown in FIG. 2, an input shaft 7, a first transmission shaft 8, a second transmission shaft 9, and an output shaft 10, through which the engine output is transmitted by a belt, are connected to a traveling transmission case 6 installed in the machine. A small diameter first transmission gear 7a and a large diameter second transmission gear 7b are fixed to the input shaft 7, and the first transmission shaft 8
A first forward speed transmission gear 8a that is always in mesh with the first transmission gear 7a and a third forward speed transmission gear 8b that is always in mesh with the second transmission gear 7b are freely rotatably supported, and
The third transmission gear 8c is fixed to the second transmission shaft 9, and the reverse gear 9 is always engaged with the transmission gear 8a for the first forward speed.
a and the second forward speed gear 9b that is always engaged with the second transmission gear 7b, and the fourth transmission gear 9c.
is fixed to the output shaft 10, and a third transmission gear 8c is attached to the output shaft 10.
and a fifth transmission gear 10a that is always engaged with the fourth transmission gear 9c, and first and second transmission shafts 8, 9 that support the forward first, second, third, and reverse gears 8a, respectively. Multi-disc friction clutches A, B, C, and D are provided between the clutches A, B, C, and D, and a hydraulic cylinder is provided to individually operate each clutch A.
Sa, Sb, Sc, and Sd are provided in a state where they are elastically biased toward the clutch disengagement side, and then each cylinder Sa... is individually extended to switch the traveling speed to 3 forward speeds and 1 reverse speed. It is configured so that it can be done.

Further, a reaping section driving pulley 11 is attached to the outer end of the case of the output shaft 10 via a one-way rotating clutch 12 that prevents the pulley 11 from being rotated in the reverse transmission state. It is constructed so that the operating speed of the vehicle can be changed in synchronization with the traveling speed.

Further, a sub-transmission gear 13 having three large, medium, and small gear portions is slidably connected to the output shaft 10 by a spline, and the sub-transmission transmission shaft 14 is connected to the sub-transmission transmission shaft 14.
Fixing three gears 14a, 14b, 14c that alternatively mesh with the sub-transmission gear 13,
The rotational speed of the output shaft 10 is configured to be variable between a high-speed transmission state for driving on the road and a two-speed transmission state of high and low speed for reaping work.

Further, the steering clutch shaft 15 supports a transmission gear 15a which is in constant engagement with a small-diameter gear 14c for auxiliary transmission, and is capable of engaging and disengaging from the sides of the transmission gear 15a, and is gear-interlocked with the left and right axles 16a, 16b. The left and right clutch gears 17a and 17b are spline-connected, so that the vehicle can be steered by sliding operation of the left and right clutch gears 17a and 17b.

As shown in Fig. 3, each hydraulic cylinder Sa
Rotary type control valve 1 that switches the operating state of...
8, and when the clutch is engaged, the control valve 18
An accumulator 19 for accumulating part of the oil supplied to the cylinder from the cylinder is provided in such a manner that the accumulated oil is discharged into the tank 20 only in the neutral gear shift state, and then the shift from the neutral gear shift state to the output shift state is performed. To make it possible to reduce the cylinder operating speed at the initial stage of the clutch engagement operation, and to increase the operating speed of the hydraulic cylinder at the time of switching from the output shifting state to the output shifting state. It is structured as follows.

As shown in FIG. 3, by providing a throttle valve 22 that lowers the supply speed of oil supplied from the hydraulic pump 21 to the control valve 18, it is possible to suppress each cylinder Sa from being operated at an unnecessarily high speed. It's like this. Further, a main relief valve 23 is provided which determines the maximum pressure of the oil supplied from the pump 21 to each cylinder Sa, and the oil discharged from this valve 23 is supplied to each clutch A for cooling. A passage 24 is provided, and a sub-relief valve 25 is further provided to determine the maximum pressure of the cooling oil supply pressure.

In the above configuration, in the present invention, the control valve 18 and the accumulator 19 are configured as shown in FIG. 4. That is, the valve casing 28
The pressure receiving piston 19A storage chamber 27 of the accumulator 19 is opened at one end of the lid body 29 which penetrates through to form a storage chamber 26 for the valve body 18A of the control valve 18 and closes one end opening of this storage chamber 26. form in the state. An oil passage 31 opening into each of the chambers 26 and 27 is formed in the valve casing 28 and the lid 29 so as to communicate with each other when the openings of the chambers 26 and 27 are brought together. The valve body 18A and the pressure receiving piston 19A, as well as two large and small coil springs 30a and 30b for biasing the pressure receiving piston 19A to return, are respectively housed in the valve casing 28 and the lid body 29 formed in this manner. Thereafter, the lid body 29 is bolted to the valve casing 28 with the openings of both chambers 26 and 27 facing each other, and the coil springs 30a and 30
One end of b is received by a step formed in the valve body storage chamber 26, and both storage chambers 26, 27
The valve is configured to have a common seal for the opening of the valve.

4, reference numeral 32 denotes a swinging arm for valve operation which is integrally fixed to the outer protruding end of the casing of the valve body 18A, and reference numeral 33 denotes an elastic engagement type ball for regulating the swinging position of the arm. 34 is a plate-shaped body bolted to close the other end of the valve body storage chamber 26, and is a speed changer for swinging the locking arm 35 that locks and swings the swinging arm 32. It also serves as the support frame for the lever.

The valve structure of the present invention can be used not only for hydraulic travel shifting but also for operating actuators in various hydraulic devices.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

Figure 1 is a side view of the combine harvester, Figure 2 is a schematic diagram of the hydraulic transmission, Figure 3 is a hydraulic circuit diagram, and Figure 4 is a schematic diagram of the hydraulic transmission.
The figure is a vertical side view of the valve structure, and FIG. 5 is a schematic diagram of the conventional structure. 18A... rotary type valve body, 19A... pressure receiving piston for accumulator, 26... valve body storage chamber, 27... piston storage chamber, 28... valve casing, 29... lid body.

Claims (1)

[Scope of utility model registration request] In a valve structure including a rotary type valve body 18A and an accumulator pressure receiving piston 19A, a storage chamber 26 for the valve body 18A is formed in the valve casing 28 with an open end. A housing chamber 27 for the piston 19A is formed in the lid body 29 with its end open, and the lid body 29 is attached to the valve casing 28 by bringing the end openings of these two chambers 26 and 27 into contact with each other.
A valve structure characterized by a fixed attachment.