JP2796916B2 - Driving force transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving force transmission device suitable for use in an engine-driven pump device used as a hydraulic pressure source for construction equipment, and more particularly to a driven gear for driving a driven object such as a pump in a driven gear. The present invention relates to a driving force transmission device in which an input shaft is spline-coupled.

[0002]

2. Description of the Related Art FIGS. 3 to 5 show an example of an engine-driven pump device of a construction machine as a conventional driving force transmission device.

In the drawing, reference numeral 1 denotes an engine as a prime mover, 1A denotes a flywheel housing which forms an outer shell of the engine 1, and an output shaft of the engine 1 is provided in the flywheel housing 1A as shown in FIG. Is provided with a disc-shaped flywheel 1B which constitutes a part of the flywheel 1B. At the other end of the flywheel housing 1A, there is provided a cylindrical intermediate cover 1C for fixing a driving force transmission device 2 described later to the engine 1 side.

Reference numeral 2 denotes a driving force transmitting device mounted on the other end of the flywheel housing 1A via an intermediate cover 1C. The driving force transmitting device 2 includes a housing 3, a cartridge 6, a driving gear 8, It is roughly composed of a drive shaft 11, a driven gear 15, and the like.

[0005] First, reference numeral 3 denotes a housing which forms an outer shell of the driving force transmission device 2. The housing 3 is connected to the intermediate cover 1 C at one end side and fixed to the intermediate cover 1 C. And a housing body 5 integrally formed on the other end of the housing. The inside of the housing body 5 includes a driving gear chamber A which is located at the center and accommodates the driving gear 8, and a driving gear chamber A. Four driven gear chambers B, B,... (Only two are shown) which are located on the outer peripheral side and are circumferentially spaced and accommodated by the driven gears 15, and lubricating oil G located at the lowermost end And an oil storage chamber C in which oil is stored. At one end of the drive gear chamber A, a support member mounting hole 5A into which a drive gear support member 7 described later is inserted is formed, and at the other end of each driven gear chamber B, a cartridge 6 Are formed in four cartridge mounting holes 5B.

Reference numerals 6 and 6 denote cartridges (only two cartridges are shown) mounted on the housing main body 5 so as to close the respective cartridge mounting holes 5B of the housing main body 5. The respective cartridges 6 are located on the inner peripheral side. A supporting portion 6A protruding toward the inside of the driven gear chamber B, and a cylindrical connecting portion 6B protruding toward the other side after expanding the other end of the supporting portion 6A. A hydraulic pump 20, which will be described later, is attached to the other end of the connecting portion 6B.

[0007] 7 is a support member mounting hole 5 of the housing body 5.
A drive gear support member attached to the housing main body 5 so as to close A is shown. The support member 7 supports one end of a hollow shaft 8A of a drive gear 8 described later.

Reference numeral 8 denotes a drive gear disposed in a drive gear chamber A of the housing main body 5. The drive gear 8 includes a cylindrical hollow shaft 8A extending in the axial direction of the housing 3, and a hollow shaft 8A. And a gear portion 8B integrally fixed to the axially intermediate portion of the drive shaft 11. The hollow shaft 8A has a spline hole in which a spline shaft portion 11A located at the other end of the drive shaft 11 described later is spline-coupled. 8C. The drive gear 8 is configured such that one end side of the hollow shaft 8A is a bearing 9.
, And the other end is rotatably supported by the other end of the housing body 5 via the bearing 10.

Reference numeral 11 denotes a spline shaft portion 11A, 1 at both ends.
1A, the drive shaft 11 has a spline shaft portion 11A at the other end and a spline hole 8C
And a spline shaft portion 11A on one end side.
Is connected to the flywheel 1B via a hub 12, a coupling 13 and the like, which will be described later, so that when the drive shaft 11 is rotated via the flywheel 1B, the drive gear 8 is integrally rotated. It has become.

Reference numeral 12 denotes a cylindrical hub mounted on the outer peripheral side of one end of the drive shaft 11, and the inner peripheral side of the hub 12 is a spline hole 12A which is spline-coupled to the spline shaft portion 11A on the one end side. . A coupling 13 is attached to one end of the hub 12, and the coupling 1
3 has a flywheel 1B via a plate 14
It is fixed to.

Reference numerals 15 and 15 denote driven gears (only two are shown) disposed in each driven gear chamber B of the housing main body 5, and each driven gear 15 has a cylindrical shape extending in the axial direction of the housing 3. Of the hollow shaft 15A and a gear portion 15B integrally fixed to an axially intermediate portion of the hollow shaft 15A and meshing with a gear portion 8B of the drive gear 8.
Inside 5A is a spline hole 15C as an input shaft insertion hole into which an input shaft 20B of the hydraulic pump 20 described later is spline-coupled. The driven gear 15 has a hollow shaft 15A rotatably supported at one end by the housing body 5 via a bearing 16 and at the other end by a support 6A of the cartridge 6 via a bearing 17.

Reference numeral 18 denotes an oil seal located on the inner peripheral side of the support member 7 to seal the space between the hub 12 and the hub 12 in a liquid-tight manner, and 19 denotes an oil seal located on the inner peripheral side of the support portion 6A of the cartridge 6.
5 shows oil seals for sealing between the hollow shaft 15A and the hollow shaft 15A in a liquid-tight manner, and the oil seals 18 and 19 prevent the lubricating oil G stored in the housing body 5 from leaking to the outside. It is.

Reference numerals 20, 20 denote connecting portions 6 of the respective cartridges 6.
B shows a hydraulic pump as an object to be driven attached to the other end side. The hydraulic pump 20 includes a pump main body 20A containing a piston (not shown) and the like inside, and a pump main body 2A.
The pump main body 20A has a flange portion 20C protruding radially outward on the outer peripheral side of one end of the pump main body 20A. . Each of the hydraulic pumps 20 spline-connects the input shaft 20B to the spline hole 15C of the driven gear 15, and
C is fixed to the connecting portion 6B of the cartridge 6 by bolts 21. In this state, the input shaft 2
The pressure oil is discharged from the inside of the pump body 20A by rotating the OB.

The lubricating oil pump 22 is provided below the other end of the housing body 5, and the base ends of the lubricating oil pumps 22, 23,... 5 shows a supply hose as an oil pipe attached to one end of the housing 5 so as to open toward each bearing 16. The lubricating oil pump 22 includes a lubricating oil G stored in an oil storage chamber C of the housing body 5. The respective supply hoses 23
Are supplied to the respective bearings 16 and the like via the.

Reference numeral 24 denotes an oil supply pipe connected to the center of the other end of the housing body 5 for supplying lubricating oil G to a spline connection portion between the drive shaft 11 and the drive gear 8, and reference numeral 25 denotes a support member. The lubricating oil G is applied to the bearing 9 via the oil passage 26.
Are shown, and each of the oil supply pipes 2
4 and 25 are connected to the lubricating oil pump 22 similarly to the supply hoses 23.

The engine driven pump device according to the prior art has the above-described configuration. When the output shaft of the engine 1 is driven to rotate, the rotational driving force of the output shaft is increased by the flywheel 1 B and the coupling 13. , And the drive gear 8 spline-coupled to the hub 12 via the drive shaft 11 to rotate. When the drive gear 8 is rotated, the driven gears 15 meshed with the drive gear 8 rotate the input shafts 20B of the hydraulic pumps 20 spline-coupled.

At this time, the lubricating oil G in the oil storage chamber C of the housing body 5 is scooped up by the driven gear 15 located below and lubricates the meshing portion between the gears 8 and 15 and the like.
On the other hand, a part of the lubricating oil G discharged from the lubricating oil pump 22 is interposed between the spline shaft portion 11A of the drive shaft 11 and the spline hole 8C of the drive gear 8 via the oil supply pipes 24 and 25 (spline connection portion). ) And bearings 9 to lubricate them. Further, the remaining lubricating oil G is discharged toward the bearing 16 and the like via each supply hose 23 to lubricate them. Then, the lubricating oil G that has lubricated each part flows downward by its own weight and returns to the oil storage chamber C.

[0018]

By the way, according to the above-mentioned prior art, the lubricating oil G in the oil storage chamber C of the housing main body 5 is discharged by the lubricating oil pump 22 to the bearing 16 through each supply hose 23. By doing so, the lubricating oil G causes the bearings 17 located in the vicinity together with the respective bearings 16.
And spline hole 15C of driven gear 15 and hydraulic pump 20
Is lubricated with the input shaft 20B (spline joint).

However, most of the lubricating oil G discharged from each supply hose 23 flows downward from the gap between the bearings 16, and the driven gears 15, the bearings 16 and the like are rotationally driven. The remaining lubricating oil G is also blown off to the outer peripheral side by the centrifugal force at this time. As a result, the lubricating oil G is hardly supplied to the spline joint between the spline hole 15C of the driven gear 15 and the input shaft 20B of the hydraulic pump 20, and the input shaft 20B is worn out early due to insufficient lubrication. In addition to this, there is a problem that the device may become unusable due to breakage or the like, and the reliability and the life are greatly reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and provides a sufficient supply of lubricating oil to a spline joint between an input shaft insertion hole of a driven gear and an input shaft of a driven object. Accordingly, an object of the present invention is to provide a driving force transmission device capable of preventing wear and damage due to insufficient lubrication and improving reliability.

[0021]

In order to solve the above-mentioned problems, the present invention employs a configuration in which a housing having one end connected to a prime mover and a cartridge mounting hole formed at the other end, and a housing having a cartridge mounting hole formed at the other end. A cartridge that is formed in a closed cylindrical shape that opens toward the housing and is mounted on the housing so as to close the cartridge mounting hole, a drive gear that is rotatably provided in the housing, and extends in the housing in the axial direction. A drive shaft having one end connected to the output shaft of the prime mover and the other end fixed to rotate integrally with the drive gear; and a housing and a cartridge interposed through the bearing so as to mesh with the drive gear. Rotatably supported,
A driven gear having an input shaft insertion hole formed at the center thereof, and an input shaft is spline-coupled to the input shaft insertion hole of the driven gear at the other end of the cartridge, and an oil is interposed between the input shaft and the cartridge. A drive object that defines a chamber is provided, and the cartridge is provided with a communication passage that is located above an input shaft of the drive object and that communicates the oil chamber with the inside of the housing. An oil pipe for supplying lubricating oil from a lubricating oil pump to the oil chamber is connected to the outer peripheral side.

[0022]

According to the above construction, the spline joint between the input shaft insertion hole of the driven gear and the input shaft of the driven object is supplied from the lubricating oil pump to the oil chamber via the oil pipe and stored in the lubrication chamber. Oil is lubricated by entering into the gap between the input shaft insertion hole of the driven gear and the input shaft of the driven object, and the bearing that supports the driven gear at one end of the housing passes through the spline connection. It is lubricated by the lubricating oil flowing to one side. Further, the bearing provided between the cartridge and the driven gear is lubricated by the lubricating oil overflowing from the communication passage formed in the cartridge.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the present embodiment, the same components as those of the prior art shown in FIGS. 3 to 5 are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numerals 31 and 31 denote cartridges (2) according to the present embodiment mounted on the housing main body 5 so as to close the respective cartridge mounting holes 5B of the housing main body 5.
Each cartridge 31 has a support portion 31A located on the inner peripheral side and protruding to one side toward the driven gear chamber B, and the other end side of the support portion 31A is enlarged in diameter. Later, it is formed in a covered cylindrical shape from a cylindrical connecting portion 31B protruding toward the other side. As shown in FIG. 2, a flange portion 20 of the hydraulic pump 20 is provided on the other surface of the connection portion 31B.
An annular seal groove 31 </ b> C is formed in which an O-ring 32 that seals the space between the hydraulic pump 20 and the cartridge 31 is formed, thereby defining an oil chamber D between the hydraulic pump 20 and the cartridge 31. Each of the cartridges 31 has a communication passage 31D at a position higher than the input shaft 20B of the hydraulic pump 20 for communicating the oil chamber D with the inside of the driven gear chamber B of the housing body 5.
Are drilled. Further, an oil passage 31E communicating the oil chamber D with the outside is provided at the lower end of the outer periphery of the connection portion 31B.
Are formed in the radial direction, and a supply hose 33 described later is connected to the oil passage 31E.

33, 33 each cartridge 31
The supply hose as an oil pipe connected to the oil passage 31E is connected to the lubricating oil pump 22 in the same manner as the supply hose 23 described in the related art. Each of the supply hoses 33 supplies the lubricating oil G discharged from the lubricating oil pump 22 to the oil passage 31E.
Is supplied into the oil chamber D via the

Next, the flow of the lubricating oil G discharged from the lubricating oil pump 22 into each supply hose 33 will be described.

First, the lubricating oil G discharged from the lubricating oil pump 22 flows into the oil chamber D from each supply hose 33 via the oil passage 31E of the cartridge 31, and the hydraulic pump 20 It is stored to a position higher than the input shaft 20B, and is discharged from the communication passage 31D into the driven gear chamber B of the housing main body 5 when the amount becomes equal to or more than a predetermined amount.

Then, in this state, a part of the lubricating oil G in the oil chamber D enters between the spline hole 15C of the driven gear 15 and the input shaft 20B of the hydraulic pump 20 (spline connection portion), and Lubricate the spline joints. Further, the hollow shaft 1 of the driven gear 15 passes through the spline connection portion.
The lubricating oil G flowing to one side of 5A reaches the bearing 16 and contributes to the lubrication of the bearing 16 together with the supply hose 23 described in the related art. On the other hand, the lubricating oil G flowing out of the communication passage 31D described above travels along the outer surface side of the support portion 31A of the cartridge 31 to reach the bearing 17, and lubricates the bearing 17.

The engine-driven pump device according to the present embodiment has the above-described configuration, and its basic operation is not particularly different from that of the prior art.

However, according to the present embodiment, the oil chamber D is defined between each cartridge 31 and the hydraulic pump 20, and the lubricating oil G supplied from the supply hose 33 is provided in the oil chamber D A configuration in which the oil is stored to a position higher than the input shaft 20B of the pump 20, and when the lubricating oil G in the oil chamber D reaches a predetermined amount or more, the oil is discharged from the communication passage 31D into the driven gear chamber B of the housing body 5. Therefore, the lubricating oil G stored in the oil chamber D penetrates between the spline hole 15C of the driven gear 15 and the input shaft 20B of the hydraulic pump 20 (spline connection portion), and the spline connection portion between the two. Can be surely lubricated, and the lubricating oil G that has flowed to one side through the spline joint can contribute to lubrication of the bearing 16. Furthermore, the bearing 17 is lubricated with the lubricating oil G by supplying the lubricating oil G flowing out from the oil chamber D via the communication passage 31D to the bearing 17 by transmitting the lubricating oil G along the outer surface of the support portion 31A of the cartridge 31. be able to.

Thus, in this embodiment, the cartridge 3
By supplying and filling the lubricating oil G into the oil chamber D defined between the hydraulic pump 20 and the hydraulic pump 20, it is conventionally difficult to supply the lubricating oil G in addition to the bearings 16 and 17. Lubricating oil G can be supplied to the spline connection between the spline hole 15C of the gear 15 and the input shaft 20B of the hydraulic pump 20 to reliably lubricate the input shaft 20B. Life can be extended and reliability can be greatly improved.

In the above embodiment, each supply hose 2
Although the case where the lubricating oil G is supplied from both sides to the bearings 16, 17 and the like provided in the housing main body 5 by the reference numerals 3 and 33 has been described as an example, the present invention is not limited to this. The supply hoses 23 connected to the other side may be abolished and only the supply hoses 33 connected to the other side may supply the lubricating oil G. In this case, the number of parts can be reduced and productivity can be improved. This has the effect of improving workability during maintenance.

In this embodiment, the case where four hydraulic pumps 20 as objects to be driven are attached to the driving force transmitting device 2 has been described as an example.
The present invention may be applied to a driving force transmitting device in which three or less or five or more 0s are attached, or another driving object may be used instead of the hydraulic pump 20.

Further, in the above embodiment, the engine 1 has been described as an example of the prime mover, but another prime mover such as an electric motor or a hydraulic motor may be used.

[0035]

As described in detail above, according to the present invention, an oil chamber is defined between the cartridge and the object to be driven, and the oil chamber is located above the input shaft of the object to be driven in the cartridge. A communication passage communicating the oil chamber with the inside of the housing is formed, and lubricating oil is supplied to the oil chamber via an oil pipe. The lubricating oil in the oil chamber can be made to penetrate into the spline coupling portion between the input shaft and the input shaft to reliably lubricate the spline coupling portion, and the bearing that supports the driven gear at one end of the housing is connected to the spline coupling portion. Can be lubricated by the lubricating oil that has flowed to one side through the part, and the bearing provided between the cartridge and the driven gear can be lubricated by the lubricating oil that has overflowed from the communication path, and the input shaft of the driven object , Prevent wear and damage of bearings To be able to improve the reliability and life.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a driving force transmission device according to an embodiment.

FIG. 2 is an enlarged longitudinal sectional view showing a cartridge, a driven gear, a hydraulic pump, and the like in FIG. 1;

FIG. 3 is a side view showing an engine-driven pump device using a driving force transmission device according to a conventional technique.

FIG. 4 is an enlarged longitudinal sectional view showing a driving force transmission device and the like in FIG. 3;

FIG. 5 is an arrow V in FIG. 3 showing a piping state of each supply hose.
It is the cross-sectional view seen from the -V direction.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 engine (motor) 1B flywheel (output shaft) 2 driving force transmission device 3 housing 5 housing body 5B cartridge mounting hole 8 drive gear 11 drive shaft 15 driven gear 15C spline hole (input shaft insertion hole) 16, 17 bearing 20 Hydraulic pump (object to be driven) 20B Input shaft 22 Lubricating oil pump 31 Cartridge 31D Communication passage 33 Supply hose (oil piping) G Lubricating oil D Oil chamber

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16H 57/04 E02F 9/22

Claims (1)

(57) [Claims] 1. A housing having one end connected to a prime mover and a cartridge mounting hole formed at the other end, and a housing having a closed cylindrical shape opening toward the other side, the housing being configured to close the cartridge mounting hole. A drive gear rotatably provided in the housing, and an axially extending inside the housing, one end of which is connected to the output shaft of the prime mover and the other end of which is connected to the drive gear. A drive shaft fixed to rotate integrally and a driven gear rotatably supported by a housing and a cartridge via a bearing so as to mesh with the drive gear and having an input shaft insertion hole formed in the center. An input shaft is spline-coupled to the input shaft insertion hole of the driven gear at the other end of the cartridge, and a driven object defining an oil chamber is provided between the cartridge and the input shaft. In the cartridge, a communication passage is formed in the cartridge above the input shaft of the object to be driven and communicates with the oil chamber and the inside of the housing. A driving force transmission device connected to an oil pipe for supplying lubricating oil to the oil chamber.