JP2009024731A - Mission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent galling of a gear due to lubrication failure at the time of starting a mission device. <P>SOLUTION: This mission device transmits an output of an engine 50 to rotation equipments 7A-7C via a gear unit GU housed inside a housing 1. The device comprises an oil supply part 16 supplying lubrication oil in a housing, and a pump 18 for lubrication oil rotating by the output of the engine 50 and supplying the lubrication oil in the housing to the gear unit GU via a lubrication oil supplying passage. Furthere, the oil supply part 16 is provided in communication with the lubrication oil supply passage, and a vacuum part 18 communicated with a housing chamber 1a and connecting a vacuum pump is provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a transmission device that transmits output from an engine to a hydraulic pump or the like via a gear unit.

  In a construction machine such as a hydraulic excavator, generally, an output from an engine is transmitted to a hydraulic pump via a gear, and the hydraulic pump is driven (see, for example, Patent Document 1). At this time, lubricating oil is supplied to the gear. As a lubricating oil supply method, a method of scooping up oil accumulated at the bottom by rotating the gear (referred to as a flip-up type) and driving an oil circulation pump There is a method of forcibly supplying oil to the lubrication part (referred to as a forced circulation type). The flip-up type is mainly used for small excavators, and the forced circulation type is often used for medium and large excavators.

JP 2003-185089 A

  However, if the forced circulation system is used, it takes time for the lubricant to reach the gear unit. When restarting from the beginning, there is a risk of galling of the gear due to poor lubrication.

A transmission device according to the present invention is a transmission device that transmits engine output to a rotating device via a gear unit housed in a housing, and includes an oil supply unit that supplies lubricating oil into the housing, and an engine output. And a lubricating oil pump that supplies the lubricating oil in the housing to the gear unit via the lubricating oil supply passage, and the oil supply portion is provided in communication with the lubricating oil supply passage and further in communication with the housing chamber. In addition, a vacuum part for connecting a vacuum pump is provided.
A block member having branch passages for distributing and guiding the lubricant from the lubricant pump to a plurality of locations in the housing may be provided, and the oil supply portion may be provided in the block member.
In this case, it is preferable to attach a block member to the center of the top of the housing and to provide a vacuum part.
The gear unit is composed of a drive gear connected to the output shaft of the engine and a plurality of driven gears arranged around the drive gear, and the rotating device serves as a hydraulic pump for supplying hydraulic oil. The lubricating oil pump can be connected to different driven gears.

  According to the present invention, the lubricating oil supply portion is provided in communication with the lubricating oil supply passage, and the vacuum portion is provided in communication with the housing chamber, so that each portion in the housing is lubricated before the operation of the transmission device. Oil can be supplied, and galling can be prevented from occurring due to poor lubrication at the start of operation of the mission apparatus.

Hereinafter, an embodiment of a mission apparatus according to the present invention will be described with reference to FIGS.
1 to 3 are a front view, a plan view, and a side view, respectively, of a mission apparatus according to the present embodiment, and FIG. 4A is a longitudinal sectional view showing a main part configuration in the mission apparatus. The mission apparatus 100 is mounted on a construction machine such as a hydraulic excavator, particularly a medium-sized or large-sized hydraulic excavator.

  As shown in FIG. 4, the mission apparatus 100 includes a housing 1 formed by a case 1A and a cover 1B, and a gear unit GU housed inside the housing 1 (housing chamber 1a). The gear unit GU includes a drive gear 2 and a plurality of driven gears 3, and the gears 2 and 3 are rotatably supported in the housing via bearings 4, respectively. The drive gear 2 is disposed at substantially the center of the housing 1, and a plurality of driven gears 3 are disposed around the drive gear 2 as shown in FIG. The driven gear 3 meshes with the drive gear 2, and the driven gear 3 is driven by the drive gear 2.

  An engine 50 is attached to one end surface of the housing 1, and an output shaft of the engine 50 is connected to the drive gear 2 via the center shaft 5. The end face of the drive gear 2 (opposite side of the engine 50) is closed with an end plate 6. As shown in FIGS. 1 to 3, hydraulic oil supply hydraulic pumps 7 </ b> A to 7 </ b> C (hydraulic oil pumps) and a lubricating oil supply hydraulic pump 8 (lubricating oil pump) are attached to the other end surface of the housing 1. ing. The hydraulic oil pumps 7A to 7C are variable displacement swash plate type hydraulic pumps. A part of the hydraulic pumps 7A to 7C can be configured as a pilot pressure supply pump.

  The input shafts of the hydraulic pumps 7A to 7C, 8 are connected to the output shaft of the driven gear 3, respectively, and the hydraulic oil pumps 7A, 7B are diagonally below the end plate 6 as shown in FIG. In addition, a hydraulic oil pump 7c and a lubricating oil pump 8 are respectively disposed. As shown in FIG. 4, an oil reservoir 1 b is provided at the bottom of the housing 1. The oil reservoir 1b communicates with the level gauge 9, and the oil level can be detected by the level gauge 9.

  In such a mission apparatus 100, when the engine 50 is driven, the engine output is transmitted to the drive gear 2 via the center shaft 5, and the drive gear 2 rotates. The rotation of the drive gear 2 is transmitted to the hydraulic pumps 7A to 7C and 8 through the driven gear 3, and the hydraulic pumps 7A to 7C and 8 are driven. As a result, hydraulic oil is supplied from the hydraulic oil pumps 7A to 7C to hydraulic actuators such as hydraulic cylinders and hydraulic motors, and the lubricating oil from the lubricating oil pump 8 passes through the hydraulic piping (not shown) to the upper part of the transmission device. To the distribution block 10.

  FIG. 5 is a perspective view of the distribution block 10. An inflow port 11 for inflow of lubricating oil is provided on the upper surface of the distribution block 10, and a plurality of outflow ports 12 for outflow of lubricating oil are provided on both side surfaces of the distribution block 10. The distribution block 10 is fixed to the bracket 15 by bolts 13 and is attached to the center of the upper surface of the housing 1 via the bracket 15.

  The lubricating oil discharged from the lubricating oil pump 8 passes through an oil cooler (not shown) and is cooled, and then flows into the distribution block from the inflow port 11. The inflow port 11 and each outflow port 12 communicate with each other in the distribution block, and the lubricating oil flowing in from the inflow port 11 is distributed to each outflow port 12 and flows out from the outflow port 12. The lubricating oil flowing out from the outflow port 12 is guided to each part of the housing 1 through the hydraulic piping 20 as shown in FIGS. 1 to 3 and supplied into the housing. The lubricating oil supplied into the housing is guided to each part through the lubricating oil supply passage in the housing, and lubrication of the bearing 4 and the meshing parts of the gears 2 and 3 is performed.

  In the present embodiment, as described above, the lubricating oil is supplied to each part in the housing by driving the lubricating oil pump 8. This lubricating oil supply system is called a forced circulation system. According to the forced circulation type, even when the gears 2 and 3 are arranged in the upper and lower portions in the housing to increase the size of the transmission device 100, the lubricating oil can be evenly distributed throughout the housing.

  On the other hand, in the forced circulation type, it takes time until the lubricating oil reaches the surfaces of the gears 2 and 3 after the driving of the pump 8 is started. For this reason, the surfaces of the gears 2 and 3 are dry when the mission apparatus 100 is operated by supplying lubricating oil for the first time after the assembly of the mission apparatus 100, or when the operation is stopped after a long period of time after the operation is stopped. When the operation of the mission device 100 is started in a state where the gears 2 and 3 are started, the gears 2 and 3 may be galling due to poor lubrication. In order to prevent this, in the present embodiment, an oil supply port is provided in the mission apparatus 100 as follows, and before starting the operation of the mission apparatus 100, lubricating oil is supplied into the housing via the oil supply port in advance.

  As shown in FIG. 5, an oil supply port 16 is provided on the upper surface of the distribution block 10, and the oil supply port 16 communicates with the outflow port 12 in the block. A cap 17 is detachably attached to the oil supply port 16, and the oil supply port 16 is closed by the cap 17. As shown in FIG. 2, a vacuum port 18 is provided in the center of the upper surface of the housing 1 along with the distribution block 10. The vacuum port 18 is a port for connecting a vacuum pump, and the housing chamber 1a can communicate with the outside through the vacuum port 18 as shown in FIG. During normal operation of the mission apparatus 100, the vacuum port 18 is closed by a plug.

Main operations of the mission apparatus according to the present embodiment will be described.
When the mission apparatus 100 is operated in a state where the lubricating oil is not attached to the surfaces of the gears 2 and 3 such as when the mission apparatus 100 is operated for the first time, first, the vacuum port 18 is unplugged to the vacuum port 18. Connect the vacuum pump. Next, the cap 17 of the oil supply port 16 is removed, the oil supply port 16 is opened, and lubricating oil is supplied from the outside through the oil supply port 16. At this time, if the vacuum pump is driven simultaneously and the housing chamber 1a is evacuated, the pressure in the housing chamber 1a becomes lower than the atmospheric pressure. It is led to each part in the housing through the lubricating oil supply passage.

  At this time, the level gauge 9 checks whether or not the amount of lubricating oil supplied into the housing is an appropriate amount. When the amount of lubricating oil is large, the lubricating oil is discharged to the outside of the housing 1, and when the amount of lubricating oil is small, the lubricating oil is supplied from the oil supply port 16 to adjust the amount of lubricating oil. If the amount of lubricating oil is an appropriate amount, the supply of lubricating oil is stopped, the oil supply port 16 is closed with a cap 17, and the vacuum port 18 is closed with a plug. After the above work, the operation of the mission apparatus 100 is started. In this case, since the lubricating oil is supplied to each part in the housing in advance, the gears 2 and 3 can be rotated smoothly, and the gears 2 and 3 can be prevented from galling.

According to the present embodiment, the following operational effects can be achieved.
(1) Since the lubricating oil distribution block 10 is provided with the oil supply port 16 and the vacuum port 18 is provided on the upper surface of the housing 1, a vacuum pump is connected to the vacuum port 18 to evacuate the housing chamber 1a. Lubricating oil can be supplied into the housing via the oiling port 16. As a result, the lubricating oil can be distributed over the surfaces of the gears 2 and 3 in advance before the operation of the mission device 100, and even when the mission device 100 is operated for the first time by the forced circulation method, the gears 2 and 3 are prevented from being galled. be able to.
(2) Since the oil supply port 16 is provided in the distribution block 10, the lubricating oil supplied from the oil supply port 16 can be easily distributed to each part in the housing. Further, the processing of the oil supply port 16 is easy.
(3) Since the distribution block 10 is attached to the center of the top of the housing 1 and the vacuum port 18 is provided, the lubricating oil can be evenly guided throughout the housing. Further, the lubricating oil supplied from the oil supply port 16 also moves by gravity, and the lubricating oil can be easily guided to each part in the housing.
(4) A gear unit GU is constituted by the drive gear 2 connected to the output shaft of the engine 50 and a plurality of driven gears 3 around the drive gear 2, and hydraulic oil pumps 7A to 7C and a lubricating oil are respectively provided to the driven gears 3. Since the pump 8 is connected, the plurality of pumps 7A to 7C, 8 can be efficiently arranged on the side of the housing 1.

  In the above embodiment, the drive gear 2 is arranged in the center of the housing, and the plurality of driven gears 3 are arranged around it. However, the configuration of the gear unit GU is not limited to this. Although the oil supply port 16 is provided in the distribution block 10, the lubricating oil can be guided to each part in the housing through the lubricating oil supply passage as long as it is provided in communication with the lubricating oil supply passage. The oil supply port 16 as the oil supply unit may be provided in addition to the distribution block 10 as the block member. Although the vacuum port 18 as a vacuum part is provided on the upper surface of the housing 1, if the vacuum chamber 18 is provided at least in communication with the housing chamber 1a above the lubricating oil surface, the housing chamber 1a can be evacuated. 18 may be provided at a position other than that described above.

  In the above embodiment, the output of the engine 50 is transmitted to the hydraulic oil pumps 7A to 7C via the mission device 100, but may be transmitted to other rotating devices other than the pump. That is, as long as the features and functions of the present invention can be realized, the present invention is not limited to the mission apparatus according to the embodiment.

The front view of the mission apparatus which concerns on this Embodiment. The top view of the mission apparatus which concerns on this Embodiment. A side view of the mission device according to the present embodiment. The longitudinal cross-sectional view which shows the principal part structure of the mission apparatus which concerns on this Embodiment. The perspective view of the distribution block which comprises the mission apparatus which concerns on this Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Drive gear 3 Driven gear 7A-7C Hydraulic oil pump 8 Lubricating oil pump 10 Distribution block 16 Oil supply port 18 Vacuum port 100 Mission apparatus

Claims (4)

A transmission device for transmitting engine output to a rotating device via a gear unit housed in a housing;
An oil supply section for supplying lubricating oil into the housing;
A lubricating oil pump that rotates according to the output of the engine and supplies the lubricating oil in the housing to the gear unit via a lubricating oil supply passage;
The oil supply unit is provided in communication with the lubricating oil supply passage,
And a vacuum unit for connecting a vacuum pump to the housing chamber. The mission device according to claim 1,
A block member formed with branch passages for distributing and guiding the lubricating oil from the lubricating oil pump to a plurality of locations in the housing;
The mission device, wherein the oil supply section is provided on the block member. The mission apparatus according to claim 2,
The mission apparatus, wherein the block member is attached to the center of the top portion of the housing, and the vacuum portion is provided. In the mission device according to any one of claims 1 to 3,
The gear unit includes a drive gear connected to the output shaft of the engine and a plurality of driven gears arranged around the drive gear.
The rotary device is a hydraulic pump for supplying hydraulic oil, and the hydraulic pump and the lubricating oil pump are connected to different driven gears and are arranged.

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