JPH0571617A - Lubrication mechanism of gear device - Google Patents

Abstract

PURPOSE:To surely lubricate the meshing part of respective gears with a simple structure by supplying oil from an oil pump to respective gear meshing parts via an oil introduction hole, an oil supply pipe and an oil jet formed on the shaft part. CONSTITUTION:A communication passage 20 which connects to an oil pump P provided outside a housing 10 is formed on a second housing 10b. The communication passage 20 is connected to one-side ends of oil introduction holes 21a, 21b formed respectively, on axial members 19a, 19c facing each other with a pinion 11 sandwiched between there. The otherside ends of the respective oil introduction holes 21a, 21b are opened to a space 25 partitioned by an gear internal tooth 13 and the respective external tooth gears 12a-12d so that they can face to the bottom part of the internal tooth gear 13 respectively, and the respective end parts are connected to each other via the oil supply pipe 22. An oil jet 23 equipped with a plural number of supply ports 23a which supply oil to the engaging part between the pinion 11 and the respective outer gears 12a-12d is interposed in the oil supply pipe 22. The oil jet 23 is fixed to a bridge member 24 spanned between the shaft members 12b, 19d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating mechanism for a gear device, and more particularly to a pinion, at least three external gears respectively meshed with the pinion, and an internal gear meshed with the external gear. The present invention relates to a lubrication mechanism of a gear device provided with.

[0002]

2. Description of the Related Art As a lubricating mechanism of a gear device, generally, a forced lubrication type in which oil is pumped by an oil pump and is supplied to each meshing portion of the gear through an oil jet, and an oil stored in a housing It is widely known that an oil bath lubrication system in which each meshing portion is lubricated by immersing the portion and rotating the gears. In the former, although the portion to be lubricated can be precisely lubricated and the cooling efficiency is good, the method disclosed in JP-A-1-
In a gear device such as a planetary gear device having a pinion as shown in Japanese Patent No. 288652, at least three external gears respectively meshed with the pinion, and an internal gear meshed with the external gear, The latter is generally adopted because it becomes difficult to handle the oil passage and it becomes difficult to fix the oil jet at an optimum position.

[0003]

However, in the above-mentioned conventional lubrication mechanism of the gear device of this type, since it is not possible to supply the required amount of oil to the required portion, the cooling efficiency is poor and the oil is not used. There is a problem that stirring loss occurs due to stirring. Furthermore, depending on the structure of the gear unit, the oil may not reach enough, and as a result, the oil film may be partially cut off, and especially when the gear rotates at high speed, the oil is moved to the outer peripheral side by centrifugal force. There is a problem in that there is a risk that the meshes scattered will cause insufficient lubrication at the meshing portion located at the center, and the meshing portion may run out of oil film. These problems can be solved by adopting the above-mentioned forced lubrication type, but in that case, the external gear and the internal gear become obstacles, the handling of the oil passage becomes complicated, and the oil jet is optimized. It is difficult to dispose it at any position.

In view of the above, the present invention has a technical object to reliably lubricate the meshing portion of each gear with a simple structure in a lubricating mechanism for a gear device of this type.

[0005]

[Means for Solving the Problems] Means taken for solving the above-mentioned technical problems are, respectively, a housing, a pinion rotatably supported on the housing, and a shaft portion provided on the housing. At least three external gears that are rotatably supported and meshed with the pinions, respectively, and internal gears that are arranged in the housing so as to cover the external gears and that mesh with the external gears In the gear device, a bridge member is installed between at least two of the shaft portions, and one end of the remaining at least one shaft portion communicates with the oil pump and the other end of the bridge member is opened into the housing so as to extend from the oil pump. Is provided with an oil introduction hole for guiding the oil of the above into the housing, and an oil supply pipe having an oil jet fixed to the bridge member Connected to, the oil to be pumped from the oil pump is that each engagement portion is to be lubricated.

[0006]

According to the above-mentioned means, the oil from the oil pump is supplied to each meshing portion through the oil introducing hole formed in the shaft portion, the oil supply pipe and the oil jet. Therefore, it is possible to guide the oil to each meshing portion with a simple structure by effectively using the existing shaft portion without causing stirring loss and poor lubrication in the oil bath lubrication type, and it is fixed at the optimum position by the bridge member. The oil jet ensures reliable lubrication at each meshing part.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a lubricating mechanism for a gear device according to the present invention will be described below with reference to the drawings.

In FIG. 1, a housing 10 includes a first housing 10a for rotatably supporting an input shaft 14 having a pinion 11 formed at one end through a bearing 15, and a first housing 10a.
A second housing 10b which is fixed to the housing 10a and rotatably supports the input shaft 14 through a bearing 16.
An output shaft 17 integrally provided with the internal gear 13 is supported via a bearing 18 and is fixed to the second housing 10b, and the pinion 11 and the internal gear are provided in a space formed between the output shaft 17 and the second housing 10b. 13 and external gears 12a, 12
It is composed of a cup-shaped third housing 10c for housing b and the like.

In this embodiment, as shown in FIGS. 1 and 2, the pinion 11 is meshed with four external gears 12a-12b arranged on the outer periphery thereof. Each external gear 12
a to 12d are such that the external gears 12a and 12c (12b and 12d) facing each other with the pinion 11 in between are located in the same plane and the external gears 12a to 12d are located at 9 a.
The shaft members 19a to 19d fixed to the second housing 10b are respectively rotatable via the bearings 20a to 20d so that the external gears adjacent to each other at 0 ° intervals are superposed in the axial direction. It is supported. Each external gear 12a-
A cup-shaped internal gear 13 is arranged on the outer periphery of 12d so as to cover them, and the internal gear 13 is meshed with the external gears 12a to 12d. Accordingly, the rotation of the input shaft 14 is caused by the pinion 11 and the external gears 12a to 1a.
It is decelerated via 2d and the internal gear 13 and transmitted to the output shaft 17.

The second housing 10b has a housing 1
A communication passage 20 communicating with an oil pump P provided outside 0 is formed, and the communication passage 20 is formed in each of the shaft members 19a, 19c facing each other with the pinion 11 interposed therebetween. It communicates with one end of 21a, 21b. The other end of each oil introduction hole 21a, 21b is opened in the space 25 defined by the internal gear 13 and the external gears 12a to 12d so as to face the bottom of the internal gear 13, respectively. The ends are communicated with each other via an oil supply pipe 22. In the present embodiment, the oil supply pipe 22 includes a pinion 11 and external gears 12a to 12d.
An oil jet 23 having a plurality of supply ports 23a for supplying oil at the meshing portion with is inserted. The oil jet 23 is a shaft member 1 having no oil introduction hole.
It is fixed to a bridge member 24 installed between 2b and 19d.

In this embodiment having such a construction, the external gears 12a to 12d are meshed with the pinion 11 and the internal gear 13 at equal intervals so that the external gears adjacent to each other do not interfere with each other and are stabilized. While obtaining the support structure, a large reduction ratio can be obtained, and the rotation of the input shaft 14 can be prevented by rotating the pinion 11,
The external gears 12a to 12d and the internal gear 13 reduce the speed greatly and transmit it to the output shaft 17.

According to this embodiment, however, the communication passage 20 and the shaft members 19a, 19 formed in the second housing 10b are formed.
via the oil introduction holes 21a and 21b formed in c,
It is guided into the oil pump space 25. Therefore, the existing shaft members 19a and 19c and the second housing 10b are effectively used, and the space 2 which is a dead space is formed with a simple structure.
Oil can be easily introduced to the oil supply pipe 22.
It is possible to arrange the oil jet 23 at the optimum position via the. As a result, it is possible to reliably lubricate each meshing portion with a simple configuration without causing stirring loss or poor lubrication in the oil bath lubrication system. Further, since the oil jet 23 is fixed by the bridge member 24, the direction of each jet 23a does not change due to vibration, and each meshing portion can be reliably lubricated.

In this embodiment, each ejection port 23a
Although the oil from the oil pump P is supplied to the meshing portion between the pinion 11 having the highest rotation speed and the external gears 12a to 12d through the above, the positions of the oil jet and the jet outlet are changed to change the external gear. 12a to 12d and the internal gear 1
Alternatively, oil may be supplied to the meshing portion with 3. Also, the same can be done when cooling each part. For example, when cooling the pinion 11 and the output shaft 17,
By changing the position of the jet port to the center and using it in combination with the hollow pinion 11 and the output shaft 17, it is possible to cool effectively.

Further, in this embodiment, the shaft member 19
Although oil introducing holes 21a and 21b are provided in a and 19c, respectively, when the amount of lubricating oil is small, it is possible to provide the oil introducing hole only in one shaft member as in the modified embodiment shown in FIG. It is possible.

In the modified embodiment shown in FIG. 3, each of the pinion 111 and the internal gear 113 has three external gears 11.
2a to 112c are meshed. External gear 112a
Is rotatably supported by the shaft member 119a so that the other external gears 112b and 112c adjacent to each other overlap in the axial direction and overlap, and the external gears 112b and 112c are in the same plane. Shaft members 119b, 1 so that they are located at
It is rotatably supported by 19c. Similar to the above-described embodiment, the shaft member 119a is formed with an oil introduction hole 121a which is communicated with an oil pump through a communication passage of the second housing whose one end is not misaligned.
An oil supply pipe 122 having an oil jet 123 is connected to the other end of 21a. The oil jet 12
3 is fixed to a bridge member 124 provided between the shaft members 119b and 119c. According to this modified embodiment, the oil from the oil pump (not shown) is used as the shaft member 11.
9a through the oil introduction hole 119a, the oil supply pipe 122, and the oil jet 123 fixed to the bridge member 124, and the pinion 111 and each external gear 112.
It is reliably supplied to the meshing part with a to 112c. Other operations are similar to those of the above-described embodiment, and detailed description thereof will be omitted here.

As described above, according to the present embodiment, the oil from the oil pump P is easily guided to each meshing portion by using the existing shaft member and the second housing effectively and with a simple structure.
The oil jet can be arranged at an optimum position, and each meshing portion can be reliably lubricated.

The above-described embodiment is only one embodiment of the present invention, and it is possible to appropriately change the embodiment of the present invention within the scope of the above-mentioned claims.

[0018]

As described above, according to the present invention,
In a gear device such as a planetary gear device, since the oil introduction hole from the oil pump is formed by effectively using the existing shaft portion, the oil can be supplied to each meshing portion without increasing the manufacturing cost due to the simple configuration. You can be ready. As a result, the oil jet can be arranged at the optimum position, and since the oil jet is fixed to the bridge member and has high vibration resistance, it is possible to reliably lubricate each meshing portion.

Further, according to the present invention, since the oil introduction hole from the oil pump is formed by using the existing shaft portion for meshing, the dead space can be obtained without changing the other structure. The oil supply pipe, the oil jet, and the bridge member can be housed in the space defined by the toothed gear and each external gear, and the gear device can be miniaturized.

Further, according to the present invention, the position of the oil jet can be easily changed according to the portion to be lubricated or cooled.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a lubrication mechanism of a gear device according to the present invention.

FIG. 2 is a side view schematically showing a main part of the embodiment shown in FIG.

FIG. 3 is a side view showing an outline of a main part of a modified embodiment of the present invention.

[Explanation of symbols]

10 Housing 11,111 Pinion 12a, 12b, 12c, 12d, 112a, 112
b, 112c External gear 13,113 Internal gear 14 Input shaft 17 Output shaft 19a, 19b, 19c, 19d, 119a, 119
b, 119c Shaft member (shaft portion) 20 Communication path 21a, 21b, 121a Oil introduction hole 22,122 Oil supply pipe 23,123 Oil jet 24,124 Bridge member 25 Space

Claims (5)

[Claims] 1. A housing, a pinion rotatably supported by the housing, and at least three external gears rotatably supported by shaft portions provided in the housing and meshed with the pinion, respectively. A gear unit having an internal gear arranged in the housing so as to cover the external gear and meshing with the external gear, and a bridge member is installed between at least two shaft portions. , At least one remaining shaft portion is provided with an oil introduction hole, one end of which communicates with an oil pump and the other end of which opens into the housing, and which guides oil from the oil pump into the housing, and is fixed to the bridge member. An oil supply pipe equipped with an oil jet is connected to the other end of the oil introduction hole, and each meshing part is formed by the oil pumped from the oil pump. A lubrication mechanism for a gear device, which is characterized by being lubricated. 2. The internal gear has a cup shape, and the other end of the oil introduction hole is opened in the space defined by the internal gear and the external gears. The lubrication mechanism for a gear device according to claim 1, wherein the oil jet and the bridge member are arranged in the space. 3. The external gear comprises four external gears, and each external gear has a pair of external gears facing each other with the pinion interposed therebetween, and
The lubrication of the gear device according to claim 2, wherein the external gears are located at 90 ° intervals, and the external gears adjacent to each other are supported on the shaft portion so as to overlap in the axial direction. mechanism. 4. The oil introduction hole is formed in at least one of shaft portions that support a pair of external gears that face each other with the pinion interposed therebetween, and the bridge member has another pair that faces the pinion with the pinion interposed therebetween. 4. The lubrication mechanism of the gear device according to claim 3, wherein the lubrication mechanism is installed between shaft portions that support the external gear of FIG. 5. The external gear comprises three external gears, wherein a pair of external gears are located in the same plane and the remaining 1
The lubrication mechanism for a gear device according to claim 2, wherein one external gear is supported on each of the shaft portions so as to be spaced apart from and axially overlap with the pair of external gears.