JPH072657U - Planetary gear - Google Patents

Abstract

(57) [Abstract] [Purpose] The planetary gear unit body, which allows the input and output shafts to be taken from the same axis, is compactly formed, and is airtight so that oil leakage and lubrication are unnecessary. To An internal gear 5 that meshes with a planetary gear 4 comprises a fixed gear member 9 and a rotary gear member 10 that have a pair of inner teeth 8 and 8'having the same shape and that face each other in a front-rear direction in the axial direction. Both ends of the planetary gear shaft 7 are held by inserting the sun gear 3 and the planetary gear 4 between a pair of front and rear rotating bodies 6 and 6 ′ whose both ends of the connecting pin 12 with the portion 13 are inserted into the through holes 11 and whose shaft ends are fixed. The shaft end is fitted into the blind shaft hole 22, and the bearings 15 and 18 with oil seals are mounted on the inner and outer circumferences of both rotating bodies, so that the sun gear shaft 1 and the inner side of the planetary gear, and the internal gear. And the outer side of the planetary gear are hermetically closed so that oil leakage and lubrication from the gear part are unnecessary.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a compact type planetary gear device that allows the input shaft and the output shaft to be coaxial with each other, and has particularly high hermeticity, which eliminates oil leakage and eliminates the need for lubrication. It is characterized by that.

[0002]

[Prior art]

 A conventional planetary gear device of this type is, for example, Japanese Utility Model Publication No. 1-11458, which is a prior application of the present applicant.

[0003]

[Problems to be solved by the device]

 The conventional planetary gear device described above is excellent in that the input shaft and the output shaft can be coaxially arranged, and the body can be configured compactly, but since it is not a sealed type, lubrication is required. Yes, it was not suitable for use in locations where oil leakage should not occur.

Therefore, it is an object to develop a planetary gear device in which the body can be configured compactly, the input shaft and the output shaft can be coaxially arranged, and the lubrication is unnecessary. It had to be an issue.

[0005]

[Means for Solving the Problems]

 To achieve the above object, the present invention rotatably supports a sun gear, a planetary gear that meshes with the sun gear, an internal gear that is provided on the same axis as the sun gear and meshes with the planetary gear, and a planetary gear. A planetary gear device comprising a rotating body rotatably mounted on the sun gear shaft, the inner gear having internal teeth of the same shape. And a pair of front and rear fixed gear members that mesh with each other and axially face each other with their inner end faces facing each other, and the rotating gear member. The pair of front and rear rotating bodies are formed by inserting the planetary gear shafts into the blind shaft holes, and connecting the shaft ends of the connecting pins with the gap-holding step portions that penetrate the rotating bodies. When fixed to the outer edge of In addition, a bearing with an oil seal for an inner peripheral bearing is attached to the sun gear shaft, and a bearing with an oil seal for an outer peripheral bearing is attached between the fixed gear member and the rotating gear member. It provides a planetary gear unit that

[0006]

[Action]

The gear device of the present invention includes internal gears of the same shape and meshes with planetary gears respectively, and an internal gear having a pair of front and rear fixed gear members and rotary gear members whose inner end faces are axially opposed to each other. Therefore, the axis line of the rotary gear member and the axis line of the sun gear shaft coincide with each other, and the input and output shafts can be coaxially arranged. In addition, a rotating body that rotatably supports the planetary gear is fitted by a pair of front and rear rotating bodies in which the planetary gear shaft is fitted in the blind shaft hole, and the planetary gear is sandwiched from the front and the rear so as to be opposed in the axial direction. Since the space between the pair of front and rear rotating bodies is held by fixing a connecting pin provided with a space holding step between both rotating bodies, the body is made compact. Furthermore, a bearing with an oil seal for the inner peripheral bearing is installed between the sun gear shaft and both rotating bodies, and a bearing with an oil seal for the outer peripheral bearing is installed between the fixed gear member and the rotating gear member. Therefore, the gear parts meshing with each other have a good sealing property, and the sun gear shaft, the planetary gear shaft, and the axis line of the internal gear do not have any runout, and the rotation is transmitted smoothly. The present invention eliminates the above-mentioned drawbacks of the conventional device as described above.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a sun gear shaft that includes a shaft coupling 2 on one side (left side in the drawing) for transmitting rotation, 3 is a sun gear that is integral with the sun gear shaft 1, and 4 is a sun gear 3 and teeth. The planetary gears 5, which are meshed with equal lengths, have the same axis as the sun gear shaft 1, and the internal gears, which mesh with each other with the same tooth length as the planetary gears 4, mesh with each other, 6 and 6'are the sun gears 3 and the planetary gears 4. , And the planetary gear 4 is rotatably supported by a needle bearing 21. Both ends of the planetary gear shaft 7 are fitted into the blind shaft holes 22 so that the planetary gear 4 revolves together with the revolution of the planetary gear 4. It is a pair of front and rear disc-shaped rotating bodies that are opposed to each other in the direction.

The internal gear 5 has internal teeth 8 and 8 ′ having the same shape, meshes with the planetary gear 4, and rotates with a pair of front and rear fixed gear members 9 whose inner end faces are axially opposed to each other. And the gear member 10. As shown in FIG. 2, the pair of front and rear rotating bodies 6 and 6 ′ are formed with the connecting pins 12 penetrating through the through holes 11 which are arranged at intervals in the circumferential direction, and are formed on the connecting pins 12. The portion 13 is brought into contact with the inner side surfaces of the rotating bodies 6 and 6'and fixed by caulking the shaft end protruding to the outer end surface from the outside, and the tooth length of the sun gear 2, the planetary gear 4 and the internal gear 4 is fixed. They are firmly connected to each other with a space substantially equal to each other, whereby good rotation accuracy between the input and output shafts can be maintained.

Further, as shown in FIG. 1, the pair of front and rear rotating bodies 6, 6 ′ are provided with stepped portions 14 facing each other on inner peripheral surfaces into which the both ends of the sun gear shaft 1 are fitted, respectively, and A bearing 15 with an oil seal for bearings is mounted to bear the sun gear shaft 1, and between the step portion 16 provided on the outer periphery and the step portion 17 provided on the fixed gear member 9 and the rotary gear member 10, respectively. Bearings 18 with oil seals for outer peripheral bearings are respectively mounted, and bearings of a pair of front and rear fixed gear members 9 and a rotating gear member 10 are provided to enhance oil sealability of gear parts meshing with each other. Reference numeral 23 in the drawing denotes an oil supply hole with a screw plug attached to the rotary body 6 and is used for supplementing when the oil enclosed in both rotary bodies 6 and 6'is deteriorated. In carrying out the present invention, thrust bearings or cross roller bearings may be used as the bearings 15 and 18 for the inner and outer peripheral bearings, respectively. Further, the fixing of the shaft end of the connecting pin 12 to both the rotating bodies 6 and 6'is not limited to caulking, but may be screwing.

In this planetary gear device configured as described above, for example, the body is fixed using the screw holes 19 provided on the outer side surface of the fixed gear member 9, and the planetary gear device is provided on the outer side surface of the rotary gear member 10. The screw hole 20 is used to connect the output shafts. The fixed gear member 9 and the rotary gear member 10 may be used in reverse to each other and the fixed gear member 9 may be provided on the output shaft side.

[0012]

[Effect of device]

 As described above, according to the present invention, the internal gear is constituted by a pair of front and rear fixed gear members and rotary gear members whose inner end faces are axially opposed to each other, and one of them is fixed and the other is rotationally transmitted. Since it is used for the purpose, the axis line of the rotary gear member and the axis line of the sun gear shaft coincide with each other, and the input and output shafts can be coaxially arranged. In addition, a rotating body that rotatably supports the planetary gear is fitted by a pair of front and rear rotating bodies in which the planetary gear shaft is fitted in the blind shaft hole, and the planetary gear is sandwiched from the front and the rear so as to be opposed in the axial direction. Since the space between the pair of front and rear rotating bodies is held by fixing the connecting pin with the space holding step provided between the both rotating bodies, the body is compactly formed, and both rotating bodies are Since the axial center accuracy of the planetary gear unit connected via the above is improved and the durability is excellent, it is suitable for, for example, a control device of an automobile.

Further, a bearing with an oil seal for an inner peripheral bearing is mounted between the sun gear shaft and both rotating bodies, and an oil seal for an outer peripheral bearing is provided between the fixed gear member and the rotating gear member. Since the bearings are mounted, the gear parts that mesh with each other have good sealing performance, and the structure is made up of a pair of front and rear rotating bodies in which the space between them is firmly held by fixing the connecting pin with the space holding step. Since the sun gear shaft, the planetary gear shaft, and the internal gear axis do not have any runout and the rotation is transmitted smoothly, the planetary gear device is particularly applicable to precision equipment. The present invention has excellent practical effects as described above.

[Brief description of drawings]

FIG. 1 is a partially cutaway vertical side view showing an embodiment of the present invention.

FIG. 2 is a partially cutaway vertical front view of the embodiment.

[Explanation of symbols]

 1 Sun Gear Shaft 2 Shaft Coupling 3 Sun Gear 4 Planetary Gear 5 Internal Gear 6 Rotating Body 6'Rotating Body 7 Planetary Gear Shaft 8 Inner Teeth 8'Inner Teeth 9 Fixed Gear Member 10 Rotating Gear Member 11 Through Hole 12 Connecting Pin 13 Interval holding step 14 Step 15 Bearing with oil seal for inner bearing 16 Step 17 17 Step 18 Bearing with oil seal for outer bearing 19 Screw hole 20 Screw hole 21 Needle bearing 22 Shaft hole 23 Lubrication hole with screw plug

Claims (2)

[Scope of utility model registration request] 1. A sun gear 3, a planetary gear 4 meshing with the sun gear 3, an internal gear 5 provided on the same axis as the sun gear shaft 1 and meshing with the planetary gear 4, and the planetary gear 4 being rotatable. In a planetary gear device comprising a rotating body rotatably mounted on the sun gear shaft 1 and fitted with a bearing planet gear shaft 7, the internal gears 5 have internal teeth 8, 8 of the same shape. 'To engage with the planetary gears 4 respectively,
Further, it is composed of a pair of front and rear fixed gear members 9 and rotary gear members 10 whose inner end faces are axially opposed to each other. The pair of front and rear rotating bodies 6 and 6'includes a pair of front and rear rotating bodies 6 and 6 ', respectively. The shaft ends of the connecting pins 12 with the spacing step portions 13 penetrating through are fixed to their outer end surfaces, and the bearing 15 with an oil seal for the inner peripheral bearing is mounted between the shaft end and the sun gear shaft 1. A planetary gear device in which a bearing 18 with an oil seal for an outer peripheral bearing is mounted between the fixed gear member 9 and the rotary gear member 10. 2. The pair of front and rear fixed gear members 9 and rotary gear member 10 have screw holes 19 and 20 on their outer side surfaces, respectively.
And the screw hole 19 of the one rotating body 6 is used for fixing, and the screw hole 20 of the other rotating body 6'is used for rotation transmission. The planetary gear device according to item 1.