JPH0549821B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to positive displacement fluid machines, and in particular to planetary hydraulic motors.

The planetary hydraulic motor proposed here can be used in particular in the aircraft industry, construction machinery, shipbuilding machinery and agricultural machinery.

The planetary hydraulic motor according to the invention can be integrated into the drive wheels or winch drum of a vehicle.

Planetary hydraulic motors are already known which have a housing in which a stator gear is fixed and forms internal gearing. This housing is closed on both sides by cover plates to form the internal chamber of the motor. One cover plate has a hollow part or cavity for supplying or discharging working fluid. The housing further includes a shaft on which is mounted a gear and a ring rotor having external and internal teeth. The ring rotor is arranged eccentrically with respect to the shaft to mesh its external teeth with the stator gear to form a transmission gear set, and its internal teeth can mesh with the gears of the shaft to form a variable volume chamber during rotation. . These variable volume chambers are bounded on one side of the lid plate by a fluid distributor rigidly attached to the shaft and having a passageway through which working fluid can be supplied and discharged from the variable volume chambers; These chambers are bounded by pressure seal elements rigidly attached to the shaft. During rotation of the shaft, the passages of the fluid distributor alternately communicate with the passages of the control valves provided on the cover plate, and the passages of the control valves communicate with the passages of the control valves arranged on the cover plate for supplying and discharging working fluid. It communicates with the cavity. The other lid plate is likewise equipped with a shaft sealing device (see Soviet Inventor's Certificate No. 696179).

Planetary hydraulic motors are also known which have a housing in which a stator gear is mounted, the stator gear being provided with internal teeth. The housing of this planetary hydraulic motor is closed on both sides by cover plates, thereby forming the internal chamber of the motor. This housing accommodates a shaft on which a gear is provided and a ring rotor arranged eccentrically with respect to this shaft, the ring rotor having internal teeth for meshing with the stator gear of the housing and the gear of the shaft, respectively. and has external teeth. The internal teeth form a variable volume chamber during rotation with the gears on the shaft. These chambers are bounded on both sides by fluid distributors rigidly attached to the shaft and can communicate via flow channels with cavities for the supply and discharge of working fluid. As these cavities, channels extending axially in the shaft are used.
The fluid distributor has valve ports, the number of which corresponds to the number of tooth spaces in the shaft gear. The valve ports can communicate with ports provided on the side of the ring rotor, which communicate via flow channels with the variable volume chamber (USSR Inventor's Certificate No.
519555).

In the planetary hydraulic motors mentioned above, it is said that these motors have a constant working volume that allows them to produce only one shaft rotational speed when they are supplied by a metering hydraulic pump. It has its drawbacks. In order to vary the rotational speed of the shaft, multiple metering pumps must be used or a variable delivery pump, which results in an expensive hydraulic drive.

It is an object of the present invention to provide a planetary hydraulic motor in which multiple shaft rotational speeds can be obtained by stepwise varying the working volume of the planetary hydraulic motor when supplied by a single metering pump. The purpose is to create

According to the invention, this object consists of at least two sections arranged in sequence on the shaft in a housing closed by a lid plate, each section being a ring arranged eccentrically with respect to the shaft. The ring rotor has external teeth and internal teeth, each of which can mesh with a stator gear connected to the housing to form a transmission gear set, and is fixed to the shaft. In a planetary hydraulic motor, the stator gear of each section is capable of meshing with gears mounted on a shaft to form a gear set with a variable volume chamber bounded by a fluid distributor provided with a , by a frictional engagement effected by the pressure of the working fluid in the internal chamber of the section to form with the housing a chamber in which the stator gear can selectively communicate with the pressure source and atmospheric pressure on the side adjacent to the housing. This can be achieved by a planetary hydraulic motor, which is characterized in that it is connected to the housing.

Preferably, the chamber is formed by annular grooves in the stator gears which can communicate with each other.

In particular, this chamber communicates with a pressure source via a channel provided in the housing and the lid plate.

Such a chamber and flow path arrangement simplifies construction and increases operational reliability.

The planetary hydraulic motor according to the invention is very simple in construction and can obtain multiple shaft rotational speeds when fed by a single metering pump.

Embodiments of the present invention shown in the accompanying drawings will be described below.

The planetary hydraulic motor has a housing 1 closed on both sides by cover plates 2, 3.
An internal chamber 4 of a planetary hydraulic motor is formed in the .

The housing 1 is supported by bearings 5 and 6.
The housing 1 accommodates a shaft 7 having axially extending channels 8, 9, 10 for supplying and discharging working fluid to the planetary hydraulic motor.
The cover plate 2 is provided with a sealing device 11 of suitable construction, which is known per se and seals the shaft 7 in a pressure-tight manner. The axial channels 8, 10 for supplying and discharging working fluid to the planetary hydraulic motor can communicate with the internal chamber 4 of the motor via check valves 12, 13, respectively.

Two sections 14, 15 of the planetary hydraulic motor
are mounted on the shaft 7 in the housing 1 and these sections 14, 15 have fluid distributors 16, 1 mounted on the shaft 7 at their end faces.
It is adjacent to 7 and 18. Bearings 5, 6 are provided on fluid distributors 16, 18, respectively.

The section 14 has a gear 19 which is meshed with the shaft 7 and rotates therewith, and a ring rotor 20 which is arranged eccentrically with respect to the shaft 7 and has internal teeth 21 and external teeth 22. This ring rotor 20
The internal teeth 21 of the shaft 7 can mesh with the teeth of the gear 19 of the shaft 7 to form a variable volume chamber 23 with the teeth of this gear 19 during rotation. The external teeth 22 of the ring rotor 20 can mesh with the internal teeth of the stator gear 24 to form a transmission gear set. Stator gear 24
is not integral with the housing 1, but is brought into and out of frictional engagement with the housing 1 under the action of the pressure of the working fluid in the internal chamber 4 of the planetary hydraulic motor. Three annular grooves 25 are provided on the outer cylindrical surface of the stator gear 24 adjacent to the housing 1, these grooves 25 can communicate via recesses 26 to form a common chamber, and this common chamber communicates via passages 27, 28 in the housing 1, passage 29 in the cover plate 2, and passage 30 in the shaft 7 to a pressure source (not shown) for disengaging the stator gear from the housing 1. or communicate with atmospheric pressure during the frictional engagement between stator gear 24 and housing 1 . Section 15 is generally similar to section 14 described above. The section 15 has a gear 31 which is rigidly attached to the shaft 7 for meshing with the internal toothing of a ring rotor 33, which is eccentric with respect to the shaft 7 to form a variable volume chamber 34. It is located. The external teeth 35 mesh with the stator gear 36 to form a transmission gear set. The stator gear 36 is not integral with the housing 1;
It is in frictional engagement with the housing 1 under the influence of the pressure of the working fluid in the internal chamber 4 of the planetary hydraulic motor.
In order to engage the stator gear 36 with the housing 1, the outer cylindrical surface of the stator gear 36 is provided with grooves 37 which can communicate with each other via recesses 38 to form a common chamber. is in communication with either a pressure source or atmospheric pressure via channels 39, 40 in the housing 1, a channel 41 in the cover plate 2, and a channel 42 in the shaft 7.

Variable volume chamber 2 in sections 14, 15
3, 34, the ring rotors 20, 33 are provided with passages 43, 44 extending in the axial direction, and the number of these passages is equal to the number of tooth spaces in the gears 19, 31. It's the same. The channels 43 and 44 are connected to the chambers 23 and 2 via a channel 45.
It is connected to 4.

Variable volume chamber 23 in section 14
The fluid distributors 16, 17 bounding the fluid distributors 16, 17 are provided with valve ports 46, 47, and these valve ports 46,
Reference numeral 47 denotes fluid distributors 16 and 17 facing the end face of the ring rotor 20 where the outlet of the flow path 43 is arranged.
is placed on the end face of the The valve ports 46, 47 communicate with the axial flow path 8 via flow paths 48, 49,
Furthermore, valve ports 50, 51 arranged in the fluid distributors 16, 17 communicate with the axial channel 10 via channels 52, 53. Fluid distributor 1 bounding variable volume chamber 34 in section 15
7, 18 are provided with valve ports 54, 55 which are connected to the end surface of the fluid distributors 17, 18 opposite to the end surface of the ring rotor 33 where the outlet of the flow path 44 is provided. It is located.
Valve ports 54, 55 are used to communicate with axial passage 9 via passages 56, 57 for supplying and discharging working fluid to the planetary hydraulic motor.
The valve ports 58, 59 of the fluid distributors 17, 18 are connected to the axial flow path 1 via the flow paths 53, 60, 61 for supplying and discharging working fluid to the planetary hydraulic motor.
Connects to 0.

The cover plate is secured to the housing 1 by means of screws 62, for example.
It is connected to the.

The planetary hydraulic motor according to the invention operates as follows.

While sections 14 and 15 operate simultaneously, grooves 25 and 37 are connected to flow paths 27, 28, 29, 30;
It communicates with the outlet (atmospheric pressure) via ports 9, 40, 41, and 42. The pressure within the interior chamber 4 forces the stator gears 24 and 36 towards the housing 1 into frictional engagement therewith.

The working fluid passes through the axial passage 10 of the shaft 7 to the passages 52, 53; 6 of the fluid distributors 16, 17, 18.
0,61 and then valve port 50,5
1; A variable volume chamber formed between the external teeth of the gears 19, 31 and the internal teeth 21, 32 of the ring rotors 20, 33 along the axial channels 43, 44 from 58, 59 via the channel 45; 23, 34 to the valve ports 50, 51; 58, 59. Under the action of the pressure of the working fluid in the variable volume chambers 20, 34, the ring rotor 2
0, 23 begin to rotate simultaneously on the teeth of the stator gears 24, 36 and on the teeth of the gears 19, 31 which are attached to the shaft 7 and transmit rotation to the housing 1.

The working fluid is then directed to the plane of symmetry of the transmission gear set A-
a variable volume chamber 23 located opposite A;
From the opposite half of 24, the valve ports 46, 4 of the fluid distributors 16, 17, 18 are conveyed to the axial passages 8, 9 for discharge into the working fluid collection tank.
7; pushed to 54, 55. At maximum conveyance of working fluid, the grooves 25 and 37 relieve pressure and flow path 3
0 and 42 communicate with the outlet end, the conveyed working fluid is used to rotate the two ring rotors 20 and 33, and the stator gears 24, 36 do not rotate relative to the housing 1.

When the working fluid enters the axial channels 10, 9 and the channel 42 simultaneously, the ring rotor 33 stops.
The stator gear 36 slips freely within the housing 1. The transported working fluid is used only by the ring rotor 20. Conversely, when the working fluid is sent to the axial channels 10, 8 and the channel 30, the transported working fluid is expended only by the rotor 33. That is, the rotor 20 stops and the stator gear 24 slips within the housing 1. As mentioned above, the axial flow path 8,
By varying the supply of working fluid to 9, 10 and channels 30, 42, three consumption rate values of working fluid are obtained for one rotation of the shaft of the planetary hydraulic motor.

According to the present invention, the amount of metal constituting the hydraulic transmission can be reduced, and the reliability and life of the planetary hydraulic motor can be increased.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a planetary hydraulic motor according to the present invention, and FIG. 2 is a sectional view taken along the - line in FIG. 1. 1... Housing, 2, 3... Lid plate, 4... Internal chamber,
5, 6... Bearing, 7... Shaft, 8, 9, 10... Channel for supplying and discharging working fluid to the planetary hydraulic motor, 11... Seal device, 12, 13... Check valve, 14, 15... Planetary Hydraulic motor sections 16, 17, 18...
Working fluid distributor, 19... Gear, 20... Ring motor, 21... Internal teeth, 22... External teeth, 23... Variable volume chamber, 24... Stator gear, 25... Annular groove, 2
6... Recess, 27, 28, 29, 30... Channel, 31
...Gear, 32...Internal gear, 33...Ring motor, 34
... variable volume chamber, 35 ... external teeth, 36 ... stator gear, 37 ... annular groove, 38 ... recess, 39,4
0,41,42...Flow path, 43,44...Flow path in ring motor, 45...Flow path, 46,47...Valve port, 48,49...Flow path, 50,51...Valve port, 52,53...Flow path, 54, 55...valve port,
56, 57...Flow path, 58, 59...Valve port, 6
0, 61...Flow path, 62...Screw.

Claims (1)

[Claims] 1. Housing 1 closed by cover plates 2 and 3
It consists of at least two sections 14, 15 arranged in sequence on the shaft 7 in the ring, each section 14, 15 having a ring rotor 20, 33 arranged eccentrically with respect to the shaft 7; A stator gear in which the rotor 20, 33 has external teeth 22, 35 and internal teeth 21, 32, and the external teeth 22, 35 and the internal teeth 21, 32 are connected to the housing 1 to form a transmission gear set, respectively. 2
4, 36 and to form a gear set with variable volume chambers 23, 24 delimited by fluid distributors 16, 17, 18 fixedly provided on the shaft 7. In a planetary hydraulic motor capable of meshing with mounted gears 19, 31, the stator gears 24, 36 of each section 14, 15 are connected to the pressure source and atmospheric pressure on the side adjacent to the housing 1. Housing 1 has chambers that can be selectively communicated.
A planetary hydraulic motor, characterized in that it is connected to the housing 1 by a frictional engagement effected by the pressure of the working fluid in the internal chamber 4 of the sections 14, 15, for forming them together. 2. Claim 1, characterized in that the chamber is formed by annular grooves 25, 37 provided in the stator gears 24, 36 and capable of communicating with each other.
The planetary hydraulic motor described in section. 3 Channels 27, 28, 29, 30 with chambers provided in the housing 1 and the lid plate 2; 39, 4
A planetary hydraulic motor according to claim 1, characterized in that the planetary hydraulic motor is in communication with a pressure source via pins 0, 41 and 42.