JPS63258220A - Hst type traveling gear shifter - Google Patents

Abstract

PURPOSE:To make a gear shifter correspondable to every car type by assembling a hydraulic motor solidly in part of a transmission case, and making a hydraulic pump attachable to each wall surface of the transmission case in an assembled part of the hydraulic motor. CONSTITUTION:A transmission case is formed into a symmetrical halved transmission, while part of a transmission case 1a at the right is made to serve as a case for a hydraulic motor M and this hydraulic motor M is set up in the inner part. And, oil passages 36 and 37 for a hydraulic pump P are formed in the side of a case serving as the case of the hydraulic motor M, the front and the top. And, the hydraulic pump P is made reattachable to these oil passages 36 and 37 according to car types. With this constitution, it is correspondable to every car type.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is a HST type traveling transmission that drives the drive axle of a tractor, in which the hydraulic motor M and the hydraulic pump P are configured separately, and the layout of the tractor is Accordingly, the position of the hydraulic pump P can be changed to the upper surface, side surface, front surface, etc. of the outer wall surface of the hydraulic motor M.

(b) Prior Art The same applicant has previously filed applications relating to HST type traveling transmissions.

For example, Utility Model Application No. 1981-73481.

(c) Problems to be Solved by the Invention However, in the prior art, the HST transmission attached to the transmission case has a structure in which a hydraulic pump and a hydraulic motor are integrated. It was placed on a mounting surface, and it was not possible to change the position or direction of the pump shaft of the hydraulic pump, which was the input shaft.

However, the layout of the tractor, the size of the engine,
The direction of the crankshaft and where the mower device is mounted on the front, abdomen, or rear of the tractor differ depending on the model. In conventional models, where the pump shaft of the hydraulic pump is fixed, the pump shaft is connected from the engine to the pump shaft. This meant that the power transmission path was long and complicated, and in order to avoid interference between the mower and the HST transmission, the ground clearance of the aircraft had to be increased.

In such a case, the present invention aims to provide an H5T type traveling transmission that is compatible with any model by making it possible to change the mounting position of the hydraulic pump.

(d) Means for Solving the Problems The objects of the present invention are as described above. Next, the configuration for achieving the objects will be explained.

In a mission case 1 that is equipped with an HST transmission and accommodates a reduction gear device and a differential gear device, a hydraulic motor M is integrally incorporated into a part of the case that constitutes the mission case 1, and the hydraulic motor M is integrated with the case of the hydraulic motor M. The hydraulic pump P is configured to be replaceable on each wall of the mission case.

(E) Embodiment The object and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings will be explained.

Fig. 1 is a side view of a mower tractor equipped with the HST type traveling transmission of the present invention, Fig. 2 is a plan sectional view of the HST two traveling transmission of the present invention, and Fig. 3 is a hydraulic pump mounted on the side of the hydraulic motor M. 4 is a perspective view showing a hydraulic circuit with a hydraulic pump P attached to the side of the hydraulic motor M, and FIG. Perspective view of an embodiment that can be worn, No. 6
The figure is a perspective view of an embodiment in which a hydraulic pump P is attached to the side of a hydraulic motor M, FIG. 7 is a perspective view of a state in which a hydraulic pump P is attached to the front of a hydraulic motor M, and FIG. 9 is a perspective view of the state in which the hydraulic pump P is mounted on the
The figure is a perspective view of a hydraulic pump P placed on top of a hydraulic motor M, with the pump shaft 14 protruding forward, and FIG. 10 is a perspective view of a state in which power is transmitted from the engine E through a joint shaft.

The configuration of the mower tractor will be explained with reference to FIG.

An engine E is placed inside the front hood, and a pulley 24 is attached to the crankshaft of the engine E.

Further, a pulley 22 is provided attached to the pump shaft 14 of the hydraulic pump P of the HST transmission, and a V-belt 23 is interposed between the pulleys 24 and 22.

PTO by extending the pump shaft 14 of the hydraulic pump P downward.
A pulley 25 is fixedly installed. The manual pulley 27 of the mower device R is connected to the PTO pulley 25 via the V belt 26.
is driving.

A drive axle 2 protrudes from the transmission case 1 to the left and right, and a rear wheel is fixedly attached to the tip.

Next, the basic configuration will be explained with reference to FIGS. 2, 3, 4, and 5.

The mission case 1 is divided into left and right halves, and is composed of a right-hand mission case 1a and a left-hand mission case 1b.

A part of the right transmission case 1a is also used as a case for the hydraulic motor M, and the hydraulic motor M is constructed inside the case.

A separate hydraulic pump P can be attached to the side, front and top surfaces of the case portion of the hydraulic motor M which is also used by the right transmission case 1a.

The hydraulic oil of the hydraulic pump P is the lubricating oil inside the transmission case 1, and the lubricating oil inside the transmission case 1 is transferred to the right side transmission case 1a shown in FIG.
The oil is sucked from the central oil passage of the triple oil passages 35 or 36 carved in the interior, converted into pressurized oil, and supplied to the hydraulic motor M in the right transmission case 1a.

The construction of the hydraulic pump P is shown in FIG.

The pump shaft 1 is attached to a pulley 22 driven by a belt 23.
4 is fixedly installed, and the rotation of the pump shaft 14 causes the piston holder 12 to rotate. A plurality of pistons 8 are fitted in one cylinder hole of the piston holder 12, and the stroke of the pistons 8 changes by changing the inclination angle of the swash plate 9 using the speed change lever 34, thereby changing the discharge amount. -ing 21 is a thrust bearing.

The pressure oil discharged by the piston 8 is transferred to the pump case 30.
The piston 7 and the piston It flows between the cylinders of the holding body 11.

The amount of pressure oil flowing into the cylinder generates a rotational force in the piston holder 11 along the inclined thrust bearing 10, causing the hydraulic motor shaft 3 to rotate.

The hydraulic motor shaft 3 is supported by a bearing part 1c attached to the side surface of the right transmission case 1a and protrudes into the left transmission case 1b.
This drives the gear 5 on the intermediate shaft 6.

゛The intermediate shaft 6 is supported by bearings in the bearing portion 1c and the left transmission case 1b.

A carved gear 6a on the intermediate shaft 6 meshes with a ring gear 15 of the differential gear device to rotate the differential gear device.

In this differential gear device, a ring gear 15 also serves as a differential gear case, and a differential pinion shaft 16 is fixed within an opening inside the ring gear 15. The differential pinions 17, 17 are loosely fitted onto the differential pinion shaft 16, and the differential pinions 17, 17 mesh with side gears 19, 19 splined onto the drive axle 2.

The side gears 19, 19 are fixedly installed on the left and right drive axles 2, and the bearings 2a, 2a of the drive axle 2 prevent them from being pulled out to the left or right.

Next, referring to FIG. 3, a description will be given of the part where the PTO boot IJ-25 is fixed to the extension of the pump shaft 14.

Since the PTO pulley 25 is not always required, the PTO shaft 28 can be inserted into and fixed to the pump shaft 14.

As shown in FIG. 4, in a portion of the right transmission case 1a that is a case for the hydraulic motor M, an oil passage to the hydraulic pump P is formed on the side surface of the right transmission case 1a. By opening the oil passage on the side surface of the right transmission case 1a, the hydraulic oil passage can be connected simply by attaching the hydraulic pump P.

The embodiment shown in FIGS. 3 and 6 is a state in which a hydraulic pump P is attached to the side surface of a hydraulic motor M as shown in FIG. Further, an oil passage 35 to the hydraulic pump P provided in the right transmission case 1a is opened as an oil passage 36 toward the front of the right transmission case la, as shown in FIG.

When attaching a hydraulic pump P to the core oil passage 36,
The layout will be as in the embodiment shown in FIG.

Further, the hydraulic pump P can be mounted on the upper surface of the hydraulic motor M, and in this case, pressure oil is introduced from the oil passage 35 through the oil passage plate 33.

When a hydraulic pump P is mounted on the upper surface of the hydraulic motor M, the configuration is as shown in FIGS. 8, 9, and 10.

In the embodiment shown in FIG. 6, the hydraulic pump P
is placed on the side of the hydraulic motor M, and the PTO boot IJ-25 is placed below.

In the embodiment shown in FIG. 7, a hydraulic pump P is attached to the front of a hydraulic motor M, and an oil passage 35 on the side is closed by a lid 32.

The lid body 32 closes off the oil passage 35 and the oil passage 36 that are not used.

In the embodiment shown in FIG. 8, a hydraulic pump P is mounted on the upper surface of the hydraulic motor M, and pressure oil is introduced into the hydraulic pump P from an oil passage 35 on the side surface of the hydraulic motor M via an oil passage plate 33. It is. In this case, since the mounting direction of the hydraulic pump P is reversed, the speed change lever 34 that rotates the swash plate 9 is shown in the drawing and protrudes rearward.

In the embodiment shown in FIG. 9, the hydraulic pump P is arranged so that the pump shaft 14 is oriented horizontally, and the pump shaft 14 protrudes forward. In this case, engine E has a horizontal crankshaft and H
This configuration can be achieved when it is disposed at the upper part of the ST type traveling transmission.

In the embodiment shown in FIG. 10, the pump shaft 14 similarly projects horizontally forward, but the difference is that power is transmitted by a joint shaft.

(F) Effects of the Invention Since the present invention is constructed as described above, it has the following effects.

First, by integrating the hydraulic motor M into the right side mission case la of the mission case 1, it is possible to use the extra space in the mission case 1 to configure the hydraulic motor M as it is, and the HST type To provide an HST type traveling transmission in which the entire configuration of the traveling transmission can be made small and the hydraulic pump P can be replaced without increasing cost by configuring only the hydraulic pump P separately. This is what was created.

Second, connect the hydraulic pump P to the side, front, or side of the hydraulic motor M.
By making it replaceable on the top surface, if the direction of the crankshaft of engine E is changed, if the mounting position of mower device R is changed, or if the size of the tractor is different, the HST type with the same configuration can be replaced. This can be done by using a travel transmission, and it can be configured as a general-purpose HST type travel transmission.

[Brief explanation of the drawing]

Fig. 1 is a side view of a mower tractor equipped with the HST type traveling transmission of the present invention, Fig. 2 is a plan sectional view of the HST type traveling transmission of the present invention, and Figure 3 is a hydraulic pump installed on the side of the hydraulic motor M. 4 is a perspective view showing a hydraulic circuit with a hydraulic pump P attached to the side of the hydraulic motor M, and FIG. Perspective view of an embodiment that can be worn, No. 6
The figure is a perspective view of an embodiment in which a hydraulic pump P is attached to the side of a hydraulic motor M, FIG. 7 is a perspective view of a state in which a hydraulic pump P is attached to the front of a hydraulic motor M, and FIG. 9 is a perspective view of the state in which the hydraulic pump P is placed in the
The figure is a perspective view of a hydraulic pump P placed on top of a hydraulic motor M, with the pump shaft 14 protruding forward, and FIG. 10 is a perspective view of a state in which power is transmitted from the engine E through a joint shaft. 1...Mission case 1a...Right side mission case 1b...Upper mission case M...Hydraulic motor P...Hydraulic pump 32...Lid body 33...Oil passage Boards 35, 36... Oil route applicant Kanzaki Kokyukoki Seisakusho Co., Ltd. Agent Patent attorney Hisashi Yano - Department Figure 1 Figure 4 Figure 5 Procedural amendment (voluntary) November 25, 1988 1986 Patent Application No. 175547 2 Name of the invention HS T-type traveling transmission Address 2-18-1 Inadera, Amagasaki City, Hyogo Prefecture Name Name Kanzaki Kyukyoku Koki Seisakusho Co., Ltd. Representative Yamaoka
Kojibe 4, Agent address: 1-11-9 Minamisenba, Minami-ku, Osaka, Japan 6, Specification subject to amendment and drawings 7, Contents of amendment (1), Line 9 of page 8 of the specification. Insert the following text between line 10. ``B is a well-known internal expansion type drum brake housed in a brake case formed in the half-split case 1b, and is fixed to the 3rd end of the hydraulic motor shaft as a parking brake.'' (2) 3rd drawing No. Figure 2 has been corrected as shown in the attached sheet.

Claims (1)

[Claims] In a mission case 1 that is equipped with an HST transmission and accommodates a reduction gear device and a differential gear device, a hydraulic motor M is integrally incorporated into a part of the case that constitutes the mission case 1, and the hydraulic motor M is integrated with the case of the hydraulic motor M. An HST type traveling transmission device characterized in that a hydraulic pump P is configured to be replaceable on each wall surface of a transmission case.