JPH01136821A - Hst integral type axle drive device - Google Patents

Abstract

PURPOSE:To facilitate assembly and disassembly of a brake device, by a method wherein a hydraulic pump is vertically situated and a hydraulic motor is horizontally positioned, a hydraulic motor shaft is coupled in a transmission manner to the diff gear device of an axle, and a brake device is secured to the other end. CONSTITUTION:A hydraulic pump P is situated to the right of the rear part of a right half division case 2 of a mission case in a state that a pump shaft is vertically positioned. A hydraulic motor M is positioned to the right of the rear part of a left half division case 1 in a state that a motor shaft 4 is placed in parallel to axles 6L and 6R. An output gear 18 of the motor shaft 4 is coupled to a ring gear 8 of a diff gear device D, formed to an abut part between the axles 6L and 6R, in a manner to transmit a power through gears 19 and 20. The other end of the motor shaft 4 is extended to dispose a brake device 7 thereto to cover it with a brake case. This constitution enables facilitation of assembly and disassembly of the brake device.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is an H5T integrated axle drive system in which an HST transmission is divided into a hydraulic pump P and a hydraulic motor M, and the HST transmission is integrated into a transmission case. It is related to the device.

(B) Prior Art Conventionally, in an HST two-axle drive system, a technique of configuring a brake device on the motor shaft of a hydraulic motor is known.

For example, Japanese Patent Application Laid-Open No. 61-261127.

(c) Problems to be Solved by the Invention However, in the conventional technology, the hydraulic motor as well as the hydraulic pump were arranged vertically, and the motor shaft of the hydraulic motor was arranged vertically. A bevel gear device is required in the power transmission system to the differential gear WD, and the brake device configured on the motor shaft 4 must also be configured as a disc brake, making it difficult to assemble and disassemble the brake device. There was a problem with this.

The present invention solves this problem by arranging the hydraulic pump P vertically, but arranging the hydraulic motor M horizontally, and configuring a brake device on the motor shaft 4 of the horizontally arranged hydraulic motor M. It is something.

(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 the HST integrated axle drive system in which the HST transmission is separated into a hydraulic pump P and a hydraulic motor M and is integrated with the transmission case, the pump shaft 9 of the hydraulic pump P
is arranged vertically, the motor shaft 4 of the hydraulic motor M is arranged parallel to the axles 6L and 6R, and the output gear 1 of the motor shaft 4
A power transmission section is provided from 8 to a ring gear 8 of a differential gear device configured at the butt part of the axles 6L and 6R, and the end of the motor shaft 4 is extended and a brake device 7 is fixedly installed at the tip. 7 is covered with a brake case extending from the transmission case component.

(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 an overall side view of a mower tractor equipped with the HST integrated axle drive system of the present invention.

A fuselage frame is supported by front wheels 11 and rear wheels 12, and the engine E supported on the fuselage frame is a vertical crankshaft type engine. Power is transmitted by a belt 15 to an input pulley 14 provided in the drive device.

The front wheel 11 is configured as a driving wheel, and the rear wheel 12, which is configured to drive the axles 6L and 6R of the front wheel 11 in the HST integrated axle drive system of the present invention, is a steering wheel and is operated by a steering handle. It is configured to be rotated.

The mower device R' is mid-mounted between the front wheels 11 and the rear wheels 12 of this structure, or the mower device R is front-mounted at a position in front of the front wheels 11.

Figure 2 is a cross-sectional plan view of the HST integrated axle drive device;
The figure is also a rear sectional view of the hydraulic pump P and hydraulic motor M.

The mission case of the HST integrated axle drive device is composed of left and right half cases, and in this configuration, it is composed of a left half case 1 and a right half case 2.

In the embodiments shown in FIGS. 2 and 3, a motor case 16 for a hydraulic motor M is attached to the rear left side of the left half case 1, and a hydraulic pump is attached to the right side of the right half case 2. A pump case 10 of P is attached.

A hydraulic pump P is configured inside the pump case 10 as shown in FIG. 3, and the input pulley 14 shown in FIG. As a result, pressure oil with a variable discharge amount is sent from the hydraulic motor M into the hydraulic motor M configured within the motor case 16.

The rotation output from the hydraulic motor M is transmitted from the motor shaft 4 to an output gear 18 fixed to the motor shaft 4 inside the left half case 1.

The output gear 18 is then transmitted to the large diameter gear 19 on the counter shaft 5 supported between the left half case 1 and the right half case 2, and then to the small diameter gear 19 on the counter shaft 5.
0 meshes with a ring gear 8 of a differential gear device configured inside the transmission case at the abutting portion of the left and right axles 6L and 6R.

Therefore, the rotation of the motor shaft 4 is caused by the output gear 18 and the large diameter gear 19.
- The speed is transmitted from the differential gear device to the axles 6L and 6R while being decelerated by the small diameter gear 20 and ring gear 8.

In the above overall configuration, in this embodiment, the motor shaft 4 extends on the side opposite to the side protruding into the left half case 1,
The brake device 7 is arranged in this part.

As shown in FIG. 3, the brake device 7 is configured to be capable of braking operation using a brake arm 7a and a brake cam 7b.

The periphery of the brake device 7 is covered with a protruding portion that extends integrally with the motor case 16 of the hydraulic motor M, which constitutes a part of the transmission case, so that the brake case is integrated with the motor rotor 6.

Further, as shown in FIGS. 2 and 3, the inside of the mission case constituted by the left half case 1 and the right half case 2 is located at the support portions of the axles 6L and 6R, the counter shaft 5, and the motor shaft 4. In many cases, grease is used for lubrication, and in case lubricating oil is not placed inside, the replenishment oil tank 2a of the HST shifting WW is installed in the right half case 2.
It is configured as a separate room inside the building.

As shown in FIG. 3, the upper part of the replenishment oil tank 2a also communicates with the replenishment oil tank la provided at the upper part of the left half case 1, increasing the replenishment oil capacity.

In addition, in this configuration, the left half case and the right half case 2
・The motor case 16 and pump case 10 are made of aluminum die-casting to eliminate machined parts as much as possible to reduce costs, but there is no problem with normal hydraulic oil pressure when using aluminum castings. Yes, but
If abnormally pressurized oil acts on the oil passage, there is a risk that it will break through the aluminum oil passage wall and cause the oil to leak.

In this configuration, in order to avoid this danger, the part without the oil passage is made of cast aluminum, but the area around the oil passage is made of cast iron.

The cast iron oil passage portions 3, 3a, and 3b, which constitute the oil passage portion, are surrounded by an aluminum material to form a cast-encased structure.

The cast iron oil passage parts include a left half case cast iron oil passage part 3, a right half case cast iron oil passage part 3a, and a pump case cast iron oil passage part 3b.
It is composed of three parts, each of which is the left half case 1.
This is cast into the right half case 2 and the pump case 10.

In the hydraulic pump P part, the bottom surface of the pump rotor 30 is placed in contact with the top surface of the pump case cast iron oil passage section 3b, and the right side surface of the motor rotor 31 of the hydraulic motor M is placed in the left half cast iron case. It is arranged in close contact with the left side surface of the oil passage section 3.

The right half case cast iron oil passage 3a constitutes an oil passage for connecting the oil passage between the pump case cast iron oil passage 3b and the left half case cast iron oil passage 30.

Figure 4 shows a cast iron oil road plate F sandwiched between the left half case 1 and the right half case 2, a hydraulic pump P placed inside the left half case 1, and a hydraulic motor M placed in the right half case. FIG. 5 is a plan sectional view of the embodiment arranged in the case 2, and is also a rear sectional view.

In the embodiments shown in FIGS. 4 and 5, both the hydraulic pump P and the hydraulic motor M are arranged inside the left half case 1 and the right half case 2, and no separate dedicated case is provided.
A bearing M22 is provided on the right side of the right half case 2.
22 supports the output end of the motor shaft 4 of the hydraulic motor M with a bearing, and the brake device 7 is arranged at the right end of the motor shaft 4.

8) The rake device 7 is provided with a rake cam 7b and a rake arm 7a, as in the previous embodiment.

In this embodiment as well, the bearing M22, which is a member constituting a part of the transmission case, extends around the brake device 7 to form a brake case.

The right end of the motor shaft 4 is bearing-supported by a cast iron oil road plate 17, and the left end is bearing-supported by a bearing cover 22.

An output gear 18 is provided in the middle of the motor shaft 4, the output gear 18 meshes with a large diameter gear 19 on the counter shaft 5, and a ring gear 8 of a differential gear device is connected to the small diameter gear 20 on the counter shaft 5. is driving.

The counter shaft 5 is supported by a cast iron oil road plate 17 and a brake case 22.

In this configuration, a cast iron oil road plate 17 is provided between the left half case 1 and the right half case 2.
Since the hydraulic motor M is attached to the right side of the hydraulic motor M, the motor port 31 of the hydraulic motor M is in close contact with the right side of the cast iron oil road plate 17.

Further, as shown in FIG. 5, the pump case cast iron oil passage section 3b, which has an oil passage communicating with the oil passage in the cast iron oil passage plate 17, is constructed by being cast inside the left half case 1. The pump rotor 30 is rotated in close contact with the oil passage portion 3b.

With this configuration, the oil passage from the hydraulic pump P to the hydraulic motor M can be made of cast iron.

Further, a brake device 7 is provided at the other end of the motor shaft 4,
The brake case of the brake device 7 can be integrally extended and protruded by a bearing 122.

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

First, the hydraulic pump P and hydraulic motor M are not integrated as in the past, but are constructed separately and placed on the side or inside the mission case, making it possible to utilize the extra space inside the mission case. Hydraulic pump P and hydraulic motor M
, and the entire structure can be made smaller than the conventional one in which an integrated HST transmission is attached to a mounting part provided in a transmission case.

Second, since the hydraulic pump P is arranged vertically and the hydraulic motor M is arranged horizontally, a bevel gear device is installed in the power transmission path from the output gear 18 on the motor shaft 4 to the ring gear 8 of the differential gear device. This eliminates the need for an intervening device, making it possible to create an HST-integrated axle drive device with a simple configuration.

Third, extend the end of the horizontally arranged motor shaft 4,
A brake device 7 is attached to the part, and the transmission case M
Since the brake case was constructed by extending the structural members of
The brake device can have a simple configuration, and the hydraulic motor M and the brake device can be made into cents.
A brake device matching the output of the hydraulic motor M can be attached.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of a mower tractor equipped with the HST integrated axle drive system of the present invention, Fig. 2 is a plan cross-sectional view of the HST integrated axle drive system, and Fig. 3 is also a hydraulic pump P and hydraulic motor. FIG. 4, a rear sectional view of the part M, shows a cast iron oil road plate 17 sandwiched between the left half case 1 and the right half case 2, and the hydraulic pump P disposed inside the left half case 1. , a plan sectional view of an embodiment in which the hydraulic motor M is disposed inside the right half case 2, and FIG. 5 is a rear sectional view. D...Differential gear device P...Hydraulic pump M...Hydraulic motor...Left half case 2...Right half case 3.3a, 3b...Cast iron oil passage Part 4...Motor shaft 5...Counter shaft 6L, 6R...Axle 7...Brake device Applicant Kanzaki Kogyoku Koki Seisakusho Co., Ltd. Procedural amendment (voluntary) December 1988 Kunio Ogawa, Commissioner of the Patent Office on the 21st2, Title of the invention: HST integrated axle drive device3, Relationship to the case of the person making the amendment Applicant Address: 2-18-1 Inadera, Amagasaki City, Hyogo Name: Corporation Kanzaki Kokyukoki Seisakusho Representative Yamaoka
Kojibe 4, Agent address: 1-11-9-5 Minamisenba, Minami-ku, Osaka City Date issued by amendment order Attachment 7: Contents of amendment (1), Page 2, lines 16 to 17 of the specification We will correct the ``brake equipment...of the brake equipment'' as shown below. "Because the brake device is constructed on the input gear fixed on the motor shaft and inside the transmission case" (2), "Motor M" on page 5, line 16 of the specification is changed to "
We will correct it as "Pump P". (3) "Pump rotor" in lines 17 to 18 on page 8 of the specification and lines 6 to 7 on page 11
We will correct it as "cylinder block". (4) "Motor rotor" in the specification, page 8, line 20 and page 10, line 20 to page 11, line 1,
We will correct it as "cylinder block". (5) The "right end" on page 10, line 7 of the specification will be corrected to "left end as shown." (6) "Left end" on page 10, line 8 of the specification is "right end"
I will correct it. (7) The statement "The pump rotor 30 is rotated in close contact" in lines 6 to 7 of page 11 of the specification will be corrected as follows. "This is because the cylinder block 30 is in close contact with each other."

Claims (1)

[Claims] An HST in which the HST transmission is separated into a hydraulic pump P and a hydraulic motor M, and is integrated with the transmission case.
In the integrated axle drive system, the pump shaft 9 of the hydraulic pump P is arranged vertically, the motor shaft 4 of the hydraulic motor M is arranged parallel to the axles 6L and 6R, and the output gear 18 of the motor shaft 4 is connected to the axles 6L and 6R. A power transmission section is provided to the ring gear 8 of the differential gear device D constructed at the abutting portion of the motor shaft 4, and a brake device 7 is fixedly attached to the tip by extending the end of the motor shaft 4, and the brake device 7 is surrounded by a mission case. An HST integrated axle drive device, characterized in that it is covered by a brake case extending from a component.