JPH0842351A - Engine integrated-type hst device - Google Patents

Abstract

PURPOSE:To take out the rotation of an engine by directly inputting the rotation of the engine into a pump shaft of a HST-type speed change gear, taking the rotation of a motor shaft as output, and enabling the rotation of the engine to be continuously varied. CONSTITUTION:An HST-type speed change gear is fixed to a hole bored on a cylinder block 5 of an engine from below and so provided as to project downward, and an oil through hole 5a for communicating an inner chamber of the HST-type speed change gear with a crank chamber of the engine is provided, and the through hole 5a is taken as an operating oil discharging/sucking passage to/from the HST-type speed change gear. The HST-type speed change gear is attached to a side cover for covering the block 5, and an oil sump part for operating oil of a device and a reserve tank attached to the engine side surface outside the side cover are communicated with each other, and an oil cooler for operating oil of the HST-type speed change gear is erected on the upper part of the tank. Moreover, a side cover housing the HST-type speed change gear is integrally provided on the side cover for supporting the crankshaft and a cam shaft, and an output shaft of the HST-type speed change gear is supported, and the side cover is covered by an oil passage plate on which an operating oil passage is bored.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an HS integrated with an engine.
A T-type transmission is attached to directly rotate the engine
The present invention relates to an engine-integrated HST device capable of inputting to a pump shaft of a T-type transmission, taking out the rotation of a motor shaft as an output, and taking out the rotation of an engine by continuously variable transmission.

[0002]

2. Description of the Related Art Conventionally, a technique for driving an HST transmission by an engine via a belt or a joint shaft has been publicly known. However, there has been no technology in which an HST type transmission device integrally attached to a cylinder block of an engine is provided.

[0003]

SUMMARY OF THE INVENTION The present invention is directly connected to the crankshaft of an engine in order to provide an engine having an output shaft capable of continuously changing the rotational speed of the engine and capable of forward and reverse rotation. The HST type transmission is attached in the form. As a result, forward / reverse rotation and stepless speed change are possible only by mounting the engine on the working machine, and there is no need to configure a transmission, a reverse transmission, etc. on the working machine side.

[0004]

The problems to be solved by the present invention are as described above. Next, the means for solving the problems will be described. In the first aspect of the present invention, the HST type transmission is fixed to the hole penetrating the cylinder block 5 of the engine from below, and the HST type transmission is provided so as to project downward, and the inner chamber of the HST type transmission is provided. And an oil passage hole communicating with the crank chamber of the engine to provide a hydraulic oil discharge / suction oil passage to the HST transmission.

According to a second aspect of the present invention, the HST type transmission is attached to the side cover that covers the cylinder block 5 of the engine, and the HST type transmission has a hydraulic oil reservoir and a lateral side surface of the engine outside the side cover. While communicating with the attached reserve tank, an oil cooler for the hydraulic oil of the HST transmission is erected above the reserve tank.

In the third aspect of the present invention, the HST side cover 1 incorporating the HST type transmission is integrally attached to the side cover which supports the crankshaft and the cam shaft of the engine, and the HST side cover 1 allows the HST side cover 1 to be installed. The HST side cover 1 is covered with an oil passage plate that supports an output shaft of a variable speed transmission and has a hydraulic oil passage formed therein.

According to a fourth aspect of the present invention, a hydraulic pump or a hydraulic motor of the HST transmission is provided with a filter on a side wall of an oil passage of a hydraulic oil passage through which a hydraulic oil in a case body of the HST transmission is discharged through a filter. A partition wall is provided to partition it.

[0008]

Next, the operation will be described. According to the first aspect, since the HST type transmission can be mounted in the dead space below the cylinder block 5, it is not necessary to increase the space of the engine. Further, since the engine lubricating oil can be used also as the working oil of the HST type transmission through the oil passage hole 5a, the cooling of the lubricating oil can be performed in the same manner as the cooling of the engine. It is possible to eliminate the overheating seizure of the device.

According to the second aspect of the present invention, the HST type transmission is attached to the side cover that covers the cylinder block 5 of the engine, and the oil reservoir of the hydraulic oil of the HST type transmission and the lateral side surface of the engine outside the side cover are provided. While communicating with the reserve tank attached to, the oil cooler for the hydraulic oil of the HST type transmission is erected above the reserve tank 21, so that the hydraulic oil of the HST type transmission can be supplied by the reserve tank 21. The piping 23 in the portion guiding the reserve tank 21 can also serve as an oil cooler and prevent overheating and seizure of the HST transmission.

According to the third aspect of the present invention, the HST side cover 1 incorporating the HST type transmission is integrally attached to the side cover which supports the crankshaft and the cam shaft of the engine.
Thus, since the output shaft of the HST transmission is supported and the HST side cover 1 is covered by the oil passage plate 2 having the hydraulic oil passage formed therein, the side cover of the cylinder block can also serve as the HST case. It was possible, and there was no need to construct a separate HST case. Further, since the portion of the oil passage plate 2 through which the heated hydraulic oil passes is arranged on the front side, the cooling efficiency can be improved.

According to the fourth aspect, a filter is provided on the side wall of the oil reservoir of the hydraulic oil passage for discharging the hydraulic oil in the case body of the HST type transmission through the filter, and the filter is the hydraulic pump or hydraulic motor of the HST type transmission. Since a partition wall is provided for partitioning the hydraulic oil filter 46, the hydraulic oil filter 46 can be easily inspected and replaced by removing the blind lid 2c from the oil passage plate 2.

[0012]

EXAMPLES Next, examples will be described. 1 is a front view of an embodiment in which an HST transmission is mounted below a cylinder block 5, FIG. 2 is a left side view of the same embodiment of FIG. 1, and FIG. 3 is an HST transmission on a side lid portion of the cylinder block 5. 4 is a front view of the embodiment in which the HST type transmission is attached to the cylinder block 5 with the HST side lid 1 attached. 6 is a left side view of the embodiment of FIG. 5, FIG. 7 is a rear view of the embodiment of FIG. 5, FIG. 8 is a plan view of the embodiment of FIG. 5, and FIG. A front view of an embodiment provided with a reservoir, FIG. 10 is a front view showing the inside of the HST side cover 1, and FIG. 11 is an HS.
12 is a side sectional view of the T-side lid 1 and the oil passage plate 2, FIG. 12 is a side sectional view of an embodiment in which the center plate 17 is arranged between the HST case 3 and the cylinder block 5, and FIG. 13 is a hydraulic oil tank 21. FIG. 4 is a front view of an embodiment in which is arranged on the upper side.

FIG. 14 is a front view of an embodiment in which an arrangement space for an HST type transmission is integrally formed in a portion of the cylinder block 5 extending below the cylinder head, and FIG. 15 is a left side view of the embodiment of FIG. FIG. 16 and FIG. 16 are the same as FIG.
17 is a front view showing the inside of the cylinder block 5 of the embodiment, and FIG. 17 is a cooling air guide plate 24 for cooling the HST transmission.
18 is a front view of an embodiment configured as described above, FIG. 18 is a rear view of an embodiment that also includes a cooling duct 26 for cooling an HST transmission, and FIG. 19 is a left side view of an embodiment that also includes a cooling duct 26. FIG. 20 is a plan view of an embodiment similarly provided with a cooling duct 26, and FIG. 21 is a front view of an embodiment in which the hydraulic oil tanks 27 and 28 are integrally formed with the cylinder block 5.
22 is a front view of the embodiment in which the motor shaft 15 is provided with the cooling fan 29, and FIG. 23 is a left side view of the embodiment of FIG.

The embodiment shown in FIGS. 1 and 2 will be described. The engine is mainly composed of a cylinder block 5. A cooling fan 14 is attached to the back surface of the cylinder block 5. A rope-type starting device 25 is attached to the rear surface of the cooling fan 14. A fuel tank 16 is placed on top of the cylinder block 5, and the front side of the cylinder block 5 is covered with a side cover 6. An HST type transmission is attached to the lower surface of the cylinder block 5, and a hole is opened in the lower surface of the cylinder block 5 to provide an oil passage 5a. The engine lubricating oil in the cylinder block 5 is directly supplied to the inside of the HST transmission from the oil passage 5a as working oil.

HS mounted on the lower surface of the cylinder block 5
The T-type transmission includes a hydraulic pump P, a hydraulic motor M, and a center plate C sandwiched between them. The pump shaft 12 is projected on the balancer shaft 7 side on the front side of the engine, and the motor shaft 15 is projected on the rear side. The V-belt 10 is provided between the pulley 9 fixed to the balancer shaft 7 and the pulley 8 fixed to the pump shaft 12.
Is intervening. Reference numeral 11 denotes a speed change lever that rotates a swash plate of the hydraulic pump P. In the embodiment shown in FIG. 1, the HST transmission is projected below the mounting table 13 on which the engine is mounted.

Next, the embodiment shown in FIGS. 3 and 4 will be described. The embodiment is the same in that the cooling fan 14 and the rope-type starting device 25 are fixed to the back side of the cylinder block 5. The front side of the cylinder block 5 is covered by a side cover 6, a center plate 17 is provided on the front side of the side cover 6, and then the HST case 3 is covered. The center plate 17 is provided with an abutting rotating surface of the hydraulic pump P and the hydraulic motor M. In this configuration, the HST type transmission is vertically arranged straight, and the motor shaft 15 is projected above the crank shaft and the balancer shaft 7.

Next, the embodiment shown in FIGS. 5 to 8 will be described. In this embodiment, the cylinder block 5
The cooling fan 14 and the rope-type starting device 25 are attached to the back surface of the cylinder block 5, but on the front side of the cylinder block 5, a side cover and an HST case are integrally formed.
The side cover 1 is covered to close the front opening of the cylinder block 5. The bearing surface of the crankshaft, the balancer shaft 7, the pump shaft 12, and the motor shaft 15 is provided on the back side of the HST side cover 1, and the opening on the front side of the HST side cover 1 is provided.
A high-pressure and low-pressure closed oil passage is formed in the oil passage plate 2 by being covered with the oil passage plate 2, and further the pump shaft 12 and the motor shaft 1 are provided.
5 also constitutes the bearing portion on the front side. In this embodiment, the HST transmission is tilted such that the right motor shaft 15 side is in a high posture.

In the embodiment shown in FIG. 9, the HST case 3 is used.
A reserve tank 21 for storing the hydraulic oil therein is arranged outside the HST case 3 and below the cylinder head H.
The reserve tank 21 and the lower part of the HST case 3 are connected by piping 23a, and the piping 23b is projected upward from the reserve tank 21 and is connected to the piping 22 projected from the upper part of the HST case 3, and the hydraulic oil is connected to the upper part. The supply port 20 is configured. The reserve tank 21, the piping 23b, and the piping 22 are exposed at a portion where the cooling air from the cooling fan 14 passes, and constitute a cooling portion for hydraulic oil.

FIG. 10 shows the inside of the HST side cover 1. Inside the HST side lid 1, the pump cylinder sliding surface 1
and a motor cylinder sliding surface 1b. Further, a part of the HST side lid 1 is provided with an insertion hole 1 for the hydraulic oil filter 46.
c is provided. FIG. 11 shows the HST side cover 1 and the oil passage plate 2,
The side sectional view of a portion of hydraulic pump P and hydraulic motor M arranged inside is shown. The hydraulic oil filter 46 inserted into the insertion hole 1c can be taken out and replaced by removing the blind lid 2c from the hole on the front side of the oil passage plate 2. This facilitates inspection, replacement, and removal of the hydraulic oil filter 46.

FIG. 12 is a side sectional view of an HST type transmission having a shape constituted by the center plate 17 and the HST case 3. In the HST transmission shown in FIG. 12, the pump shaft 12 is arranged in the upper part, the motor shaft 15 is arranged in the lower part, and the pump shaft 12 projects to both the left and right sides.
Has a special structure that protrudes only to the left. HST
The hydraulic oil filter 46 is exposed at the top of the case 3.

In FIG. 13, a reserve tank 21 is provided at the upper part, and is connected to the HST side lid 1 by piping 23 and 22, and a working oil supply port 20 extending upward from the reserve tank 21 is provided with a dipstick. It is provided. Reference numeral 19 is an engine cover.

In the embodiment shown in FIGS. 14, 15 and 16, the side cover 6 has a general shape as a whole, and the side cover 6 projects below the cylinder head H to form the portion in the HST case 30. ing. Power is transmitted from the pulley 8 fixed to the balancer shaft 7 to the pulley 9 of the pump shaft 12 by the V-belt 10 to the pump shaft 12 of the hydraulic pump P arranged in this portion. In FIG.
Details of the HST case 30 configured inside the side cover 6 are shown. The inside of the HST case 30 is a space in which hydraulic oil is independent, and the pump cylinder sliding surface 6a is provided in the space.
And a motor cylinder sliding surface 6b.

In the embodiment shown in FIG. 17, in order to introduce the cooling air from the cooling fan 14 to cool the HST type transmission, the cylinder head H is positioned below the cylinder head H and rearward. A cooling air guide plate 24 is formed at a position around the cooling fan 14.

In the embodiment shown in FIGS. 18, 19 and 20, a cooling duct 26 is formed from the cooling fan 14, and the cooling duct 26 guides the cooling air from the cooling fan 14 to the front side. , The heat generated in the HST transmission is cooled.

In the embodiment shown in FIG. 21, the inside of the cylinder block 5 itself has a double structure. The double-structured portion of the cylinder block 5 is used as the reserve tanks 27 and 28 of the HST transmission. With this structure, the working oil accumulated in the reserve tanks 27 and 28 inside the cylinder block 5 is cooled by the cooling air from the cooling air guide plate 24.

In the embodiment shown in FIGS. 22 and 23,
A cooling fan 29 for cooling the portion of the HST transmission is arranged on the motor shaft 15. It goes without saying that the motor shaft 15 can be connected to another shaft or a pulley can be attached to drive the working machine.

[0027]

Since the present invention is constructed as described above, it has the following effects. According to the first aspect of the present invention, the HS is inserted from below into the hole formed in the cylinder block 5 of the engine.
A T-type transmission is fixed and protrudes downward, and an oil passage hole 5a is provided to connect the inner chamber of the HST transmission and the crank chamber of the engine. The oil passage hole 5a is provided in the HST-type transmission device. Since the hydraulic oil discharge / suction oil passage to the HST type transmission can be installed in the dead space below the cylinder block 5, there is no need to increase the engine space. Further, since the engine lubricating oil can be used also as the working oil of the HST type transmission through the oil passage hole 5a, the cooling of the lubricating oil can be performed in the same manner as the cooling of the engine. It is possible to eliminate the heat burn-in of the device.

According to a second aspect of the present invention, the HST type transmission is attached to the side cover which covers the cylinder block 5 of the engine,
The oil reservoir for the hydraulic oil of the HST transmission and the reserve tank attached to the lateral side of the engine outside the side lid communicate with each other, while the oil cooler for the hydraulic oil of the HST transmission stands above the reserve tank 21. Since it is installed, the hydraulic oil of the HST transmission can be replenished by the reserve tank 21, and the piping 23 that guides the reserve tank 21 can also serve as an oil cooler, thereby heating the HST transmission. It was possible to prevent burn-in.

According to a third aspect of the present invention, the HST side lid 1 incorporating the HST type transmission is integrally attached to the side lid bearing the crankshaft and the camshaft of the engine, and the HST side lid 1 allows the HST side lid 1 to be installed. Since the output shaft of the variable speed transmission is supported and the HST side cover 1 is covered by the oil passage plate 2 having the hydraulic oil passage formed therein, the HST case can also be used as the side cover of the cylinder block. It is no longer necessary to construct an HST case separately. Further, since the portion of the oil passage plate 2 through which the heated hydraulic oil passes is arranged on the front side, the cooling efficiency can be improved.

According to a fourth aspect of the present invention, a hydraulic pump or hydraulic motor of the HST transmission is provided with a filter on the side wall of the oil reservoir of the hydraulic oil passage through which the hydraulic oil in the case body of the HST transmission is discharged through a filter. Since a partition wall is provided for partitioning the hydraulic oil filter 46, it is necessary to inspect and replace the hydraulic oil filter 46.
It was made easy by removing the blind lid 2c from the part.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment in which an HST type transmission is mounted below a cylinder block 5.

FIG. 2 is a left side view of the embodiment of FIG.

FIG. 3 is a front view of an embodiment in which an HST type transmission is attached to a side lid portion of a cylinder block 5.

FIG. 4 is a left side view of the embodiment of FIG.

FIG. 5 is a front view of an embodiment in which an HST side cover 1 is attached to a cylinder block 5 and an HST transmission is attached.

6 is a left side view of the embodiment of FIG.

7 is a rear view of the embodiment of FIG.

FIG. 8 is a plan view of the embodiment of FIG.

9 is a front view of an embodiment in which an oil reservoir is provided in the configuration of the embodiment of FIG.

FIG. 10 is a front view showing the inside of the HST side cover 1.

11 is a side sectional view of the HST side cover 1 and the oil passage plate 2. FIG.

FIG. 12 is a side sectional view of an embodiment in which a center plate 17 is arranged between the HST case 3 and a cylinder block 5.

FIG. 13 is a front view of an embodiment in which a hydraulic oil tank 21 is arranged at the top.

FIG. 14 is a front view of an embodiment in which an arrangement space for an HST transmission is integrally formed in a portion where a cylinder block 5 extends below a cylinder head.

FIG. 15 is a left side view of the embodiment of FIG.

FIG. 16 is a cylinder block 5 of the embodiment of FIG.
FIG.

FIG. 17 is a front view of an embodiment in which a cooling air guide plate 24 for cooling the HST transmission is configured.

FIG. 18 is a rear view of the embodiment in which the HST transmission is also cooled by using the cooling duct.

FIG. 19 is a left side view of the embodiment similarly including the cooling duct 26.

FIG. 20 is a plan view of an embodiment also including a cooling duct 26.

FIG. 21 is a front view of an embodiment in which the hydraulic oil tanks 27 and 28 are integrally formed with the cylinder block 5.

FIG. 22 is a front view of an embodiment in which a cooling fan 29 is provided on the motor shaft 15.

23 is a left side view of the embodiment of FIG.

[Explanation of symbols]

 1 HST side lid 2 Oil path plate 3 HST case 5 Cylinder block 6 Side lid 7 Balancer shaft 11 Gear shift lever

Claims (4)

[Claims] 1. An HST type transmission is fixed from below to a hole penetrating a cylinder block 5 of an engine, and the HS
The T-type transmission is provided so as to project downward, and an oil passage hole 5a is provided to connect the inner chamber of the HST-type transmission device with the crank chamber of the engine. The oil passage hole 5a is operated to the HST-type transmission device. An engine integrated HST device characterized by an oil discharge / suction oil passage. 2. An HST transmission is attached to a side cover that covers the cylinder block 5 of the engine, and an oil reservoir for hydraulic oil of the HST transmission and a reserve tank attached to the lateral side of the engine outside the side cover. The engine-integrated HST is characterized in that the oil cooler for hydraulic oil of the HST transmission is erected above the reserve tank while communicating with the HST transmission.
apparatus. 3. An HST side cover 1 having a built-in HST type transmission is integrally attached to a side cover which supports a crank shaft and a cam shaft of an engine, and the HST side cover 1 allows the HST type transmission to be installed. An engine-integrated HST device in which an HST side cover 1 is covered with an oil passage plate 2 which supports an output shaft and has a hydraulic oil passage formed therein. 4. A partition for partitioning a filter to a hydraulic pump or a hydraulic motor of an HST type transmission, on a side wall of an oil reservoir of an operating oil passage for discharging hydraulic oil in a case body of the HST type transmission through a filter. An engine-integrated HST device characterized by having a wall.