JP5367005B2 - Hydraulic electric hybrid motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic and electric hybrid motor in which a hydraulic motor, an electric motor and a speed reducer are arranged on the same axis and a power combining mechanism is made unnecessary, thereby a rise in cost and an increase in attachment space are avoided and also both the hydraulic motor and electric motor can be driven at an optimal rotational speed. <P>SOLUTION: A hydraulic motor, an electric motor and a speed reducer are arranged on the same axis and the electric motor is disposed between the hydraulic motor and the speed reducer. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to a hydraulic / electric hybrid motor used in a driving device that outputs rotational force used in a construction machine or a work machine such as an agricultural machine. In particular, the hydraulic motor and the electric motor are connected in series on the same central axis. The present invention relates to a hydraulic electric hybrid motor.

  As one of energy saving measures in construction machines or work machines such as agricultural machines, energy that was conventionally discharged as heat, for example, inertial energy when stopping excavation of a hydraulic excavator, or potential energy when lowering in a crane device It is becoming common to convert and store etc. into electric energy and reuse it at startup. As described above, Patent Document 1 and Patent Document 2 have been proposed as conventional techniques aiming at energy regeneration.

  Patent Document 1 describes a hydraulic hybrid motor of a system in which an electric motor is arranged on the outer periphery of a cylinder of a hydraulic motor.

  Patent Document 2 describes a hybrid drive device in which a hydraulic motor and an electric motor are connected by a power combining mechanism and arranged in parallel. FIG. 3 is a front view of a hybrid turning drive unit HB that rotationally drives the upper turning body described in Patent Document 2. In the figure, reference numeral 110 denotes a hydraulic motor, and 112 denotes an electric motor, which is mounted and fixed on the upper surface of the gear box 114. In the gear box 114, as shown by a broken line, the gear 114a attached to the output drive shaft of the hydraulic motor 110, the gear 114b attached to the output shaft of the electric motor 112, and the gears 114a and 114b are intermediately engaged. A gear 114c is provided. In the driving state, the gears 114a and 114b are rotationally driven in the same direction, and accordingly, a driving force obtained by synthesizing the rotational driving force provided by the gears 114a and 114b is applied to the shaft 114d of the gear 114c. A gear 114e attached to the lower end of the shaft 114d meshes with an unillustrated planetary gear in the speed reduction mechanism 116, and a drive gear 118 is provided on an output side shaft thereof. The drive gear 118 forms an upper swing body. It is designed to mesh with the internal gear that does not.

JP 2010-142086 A JP 2008-291522 A

  By the way, since patent document 1 has the rotating shaft of a hydraulic motor and an electric motor in common, it has the characteristic that a structure becomes compact. However, the hydraulic motor and the electric motor have different optimum rotational speeds in terms of specifications or structure. For this reason, if the rotating shaft is shared and the rotational speeds of the hydraulic motor and the electric motor are the same, the optimal rotational speed of one becomes a rotational speed that is not optimal for the other, and both adopt the optimal efficiency and structure. It ’s difficult.

  Further, Patent Document 2 has a problem that the rotating shaft is not shared, and thus the cost of the power combining mechanism increases.

  The present invention has been made to solve the above-described problems, and avoids an increase in cost and an increase in installation space by disposing a hydraulic motor, an electric motor, and a speed reducer side by side to eliminate the need for a power combining mechanism. It is another object of the present invention to provide a hydraulic / electric hybrid motor that can be driven at an optimum rotational speed for both the hydraulic motor and the electric motor.

  In order to achieve the above object, a hydraulic electric hybrid motor according to the present invention has a hydraulic motor, an electric motor, and a reduction gear arranged on one axis, and the electric motor is arranged between the hydraulic motor and the reduction gear.

  The electric motor may be housed and formed in an electric motor lid portion and an electric motor housing, and an electric motor rotating shaft having a cavity in the center may be supported by two upper and lower bearings. The cavity may be a cylindrical cavity having a diameter larger than the diameter of the rotating shaft of the hydraulic motor. The electric motor housing may be connected to a speed reducer lid portion that is a lid of the speed reducer and a bottom portion thereof. The electric motor rotating shaft of the electric motor penetrates freely through the center of the speed reducer lid, and further, the rotating shaft of the hydraulic motor having the same central axis passes through the cavity of the electric motor rotating shaft of the electric motor. You may do it. A reduction gear housing may be provided under the reduction gear cover, and a plurality of gears may be housed together with the rotation shaft of the hydraulic motor and the motor rotation shaft of the electric motor.

  In order to achieve the above object, a second hydraulic electric hybrid motor according to the present invention may be configured such that an electric motor, a hydraulic motor, and a reduction gear are arranged on one axis, and the hydraulic motor is disposed between the electric motor and the reduction gear.

  The hydraulic motor has a housing formed of a hydraulic motor lid, a hydraulic motor upper housing, and a hydraulic motor bottom plate, and includes a hydraulic motor rotating shaft, a swash plate, and a piston therein, and the hydraulic motor The rotating shaft passes through the center hole of the swash plate, is rotatably supported by a hydraulic motor upper housing via a bearing, and further the hydraulic motor rotating shaft extends from the front end surface of the cylinder block. Formed integrally with the cylinder block, the hydraulic motor rotating shaft may have a hollow in the center and be supported by a bearing provided on the hydraulic motor bottom plate.

  The cavity may be a cylindrical cavity having a diameter larger than the diameter of the motor rotating shaft. The hydraulic motor bottom plate also has a function as a lid of the speed reducer. An electric motor that has a hydraulic motor rotating shaft that freely passes through the center of the hydraulic motor bottom plate and that has the same central axis in the cavity of the hydraulic motor rotating shaft. The motor rotation shaft may be penetrated rotatably.

  According to the present invention, since the hydraulic motor and the electric motor are arranged in series, the occupied space when mounted on the vehicle is reduced and the layout is excellent as compared with the conventional parallel arrangement type driving device. Yes.

  Also, with regard to workability when assembling this device to a vehicle, the conventional parallel arrangement type drive device has poor accessibility to the mounting flange surface of the speed reducer or gearbox due to the presence of the power combining mechanism. Is bad. On the other hand, in the present invention, since the power synthesizing function is built in the speed increaser, the access to the mounting flange surface of the speed reducer or the speed increaser is good, and the workability is good.

1 is a configuration diagram of a first embodiment of a hydraulic electric hybrid motor according to the present invention. FIG. It is a block diagram of 2nd Example of the hydraulic electric hybrid motor which concerns on this invention. It is a block diagram of the conventional hybrid drive device.

  The configuration of the hydraulic / electric hybrid motor according to the present invention will be described with reference to FIGS. 1 and 2.

  FIG. 1 shows a configuration according to a first embodiment of a hydraulic / electric hybrid motor 2 according to the present invention. The electric motor 5 is arranged between them.

  The hydraulic motor 4 is fixed to an electric motor lid 7 provided on the electric motor head so that the rotary shaft 14 that is long enough to penetrate the electric motor faces the electric motor 5 side.

  The electric motor 5 is housed and formed in an electric motor lid portion 7 and an electric motor housing 8, and an electric motor rotating shaft 12 having a cavity 13 in the center is supported by upper and lower bearings 10 and 20. The cavity 13 is a cylindrical cavity having a diameter larger than the diameter of the rotating shaft 14.

  The motor rotating shaft 12 is provided with a core 15 around it. In addition, an electric motor inner lid portion 9 for defining a portion for housing the lower portion of the hydraulic motor 4 is provided inside the electric motor lid portion 7, and the bearing 10 is rotatably fixed.

  On the other hand, on the bottom surface of the motor housing 8, an oil seal 18 is disposed in an opening penetrating the bottom to seal the motor rotating shaft 12 rotatably.

  The electric motor housing 8 is connected to a speed reducer lid portion 22 that is a lid of the speed reducer 6 and a bottom portion thereof. An electric motor rotating shaft 12 of the electric motor 5 passes through the center of the speed reducer cover portion 22 in a freely rotatable manner, and a rotating shaft 14 of the hydraulic motor 4 having the same central axis inside the cavity 13 of the electric motor rotating shaft 12 of the electric motor 5 is provided. It penetrates freely.

  A speed reducer housing 23 is provided under the speed reducer cover 22, and a plurality of gears are housed together with the rotating shaft 14 of the hydraulic motor 4 and the motor rotating shaft 12 of the electric motor 5. A first sun gear 38 is attached to the outer periphery of the end of the motor rotating shaft 12 that is hollow inside the reduction gear housing 23. The first sun gear 38 is provided so as to mesh with the first planetary gear assembly 24.

  On the other hand, the second sun gear 40 is attached to the outer periphery of the rotating shaft 14 of the hydraulic motor 4. The second sun gear 40 is also provided so as to mesh with the first planetary gear assembly 24. Thus, the power of the motor rotating shaft 12 and the rotating shaft 14 is combined in the first planetary gear assembly 24.

  Here, the speed ratio between the first sun gear 38 and the first planetary gear assembly 24 and the speed ratio between the second sun gear 40 and the first planetary gear assembly 24 are proportional to the optimum rotational speeds of the motor rotating shaft 12 and the rotating shaft 14, respectively. The hydraulic motor 4 and the electric motor 5 are configured to be driven at different rotational speeds.

  The second sun gear 40 is provided so as to mesh with the first gear 26. The first gear 26 is connected to the first holder 30 via the first shaft 28. Here, the first planetary gear assembly is constituted by the first gear 26, the first shaft 28, and the first holder 30. The first holder 30 is connected so as to mesh with the third sun gear 42. The third sun gear 42 is connected so as to mesh with the second gear 34. The second gear 34 is connected to the second holder 44 via the second shaft 32.

  The second holder 44 is connected to a speed reducer output shaft 47, and this speed reducer output shaft 47 is pivotally supported by a third bearing 36 and a fourth bearing 46 as a central axis.

  By configuring as described above, firstly, since the hydraulic motor and the electric motor are arranged in series, the occupied space when mounted on the vehicle is reduced and the layout is excellent compared to the conventional parallel arrangement type driving device. . Second, since the power combining function is built in the speed reducer 6, the accessibility to the mounting flange surface of the speed reducer 6 is good, and the workability is good.

  FIG. 2 shows a configuration according to a second embodiment of the hydraulic / electric hybrid motor according to the present invention, in which the electric motor 52, the hydraulic motor 54, and the speed reducer 56 are arranged on one axis, and between the electric motor 52 and the speed reducer 56. A hydraulic motor 54 is arranged.

  The electric motor 52 is provided at the head of the hydraulic motor 54, the electric motor bottom plate 58 is provided on the hydraulic motor lid 66, and is fixed so that the rotary shaft 60 that is long enough to penetrate the hydraulic motor 54 faces the hydraulic motor 54 side. .

  The hydraulic motor 54 has a housing 69 formed of a hydraulic motor cover 58, a hydraulic motor upper housing 63, and a hydraulic motor bottom plate 68, and is constituted by a hydraulic motor rotating shaft 64, a swash plate 76, and a piston 78 therein. The

  The front surface of the swash plate 76 is fixed to the inner surface of the hydraulic motor upper housing 63 with bolts or the like.

  A plurality of pistons 78 are provided in the cylinder block 67. Each piston 78 has a spherical head 77.

  The cylinder block 67 is formed in a columnar shape, and a piston 78 is slidably formed in the cylinder block 67.

  The hydraulic motor rotating shaft 64 passes through the center hole of the swash plate 76 and is rotatably supported by the hydraulic motor upper housing 63 via a bearing 72. The hydraulic motor rotating shaft 64 is sealed with an oil seal 70 between the hydraulic motor lid 66. Further, the hydraulic motor rotating shaft 64 is integrally formed so as to extend from the front end surface of the cylinder block 67. The hydraulic motor rotating shaft 64 has a cavity 62 in the center, and is supported by a bearing 80 provided on the hydraulic motor bottom plate 68. The cavity 62 is a cylindrical cavity having a diameter larger than the diameter of the rotating shaft 60.

  On the other hand, in the hydraulic motor bottom plate 68, an oil seal 82 is disposed in an opening that penetrates the bottom, and the hydraulic motor rotating shaft 64 is rotatably sealed.

  The hydraulic motor bottom plate 68 also has a function as a lid of the speed reducer 56. A hydraulic motor rotating shaft 64 passes through the center of the hydraulic motor bottom plate 68 in a rotatable manner, and an electric motor rotating shaft 60 of an electric motor 52 having the same central axis passes through a cavity 62 in the hydraulic motor rotating shaft 64 so as to freely rotate. Yes.

  A reduction gear housing 84 is provided under the hydraulic motor bottom plate 68, and a plurality of gears are accommodated together with the hydraulic motor rotating shaft 64 of the hydraulic motor 54 and the rotating shaft 60 of the electric motor 52. A first sun gear 86 is attached to the outer periphery of the end of the hydraulic motor rotating shaft 64 that is hollow inside the reduction gear housing 84. The first sun gear 86 is provided so as to mesh with the first planetary gear assembly 88.

  On the other hand, the second sun gear 90 is attached to the outer periphery of the rotating shaft 60 of the electric motor 52. The second sun gear 90 is also provided so as to mesh with the first planetary gear assembly 88. In this way, the power of the hydraulic motor rotating shaft 64 and the rotating shaft 60 is combined.

  Here, the speed ratio between the first sun gear 86 and the first planetary gear assembly 88 and the speed ratio between the second sun gear 90 and the first planetary gear assembly 88 are set to optimum rotational speeds of the hydraulic motor rotating shaft 64 and the rotating shaft 60, respectively. The electric motor 52 and the hydraulic motor 54 are configured to be driven at different rotational speeds.

  The second sun gear 90 is provided so as to mesh with the first gear 92. The first gear 92 is connected to the first holder 96 via the first shaft 94. Here, the first planetary gear assembly is configured by the first gear 92, the first shaft 94, and the first holder 96. The first holder 96 is connected to mesh with the third sun gear 98. The third sun gear 98 is connected so as to mesh with the second gear 100. The second gear 100 is connected to the second holder 104 via the second shaft 102.

  The second holder 104 is connected to a reduction gear output shaft 83, and the reduction gear output shaft 83 is pivotally supported by a third bearing 106 and a fourth bearing 108 as a central axis.

  By configuring as described above, firstly, since the hydraulic motor and the electric motor are arranged in series, the occupied space when mounted on the vehicle is reduced and the layout is excellent compared to the conventional parallel arrangement type driving device. . Second, since the power combining function is built in the speed reducer 6, the accessibility to the mounting flange surface of the speed reducer 6 is good, and the workability is good.

  Although the preferred embodiments of the present invention have been described with reference to the drawings, those skilled in the art can naturally make various modifications based on the above drawings and descriptions.

DESCRIPTION OF SYMBOLS 2 Hydraulic electric hybrid motor 4 Hydraulic motor 5 Electric motor 6 Reduction gear 7 Electric motor cover part 8 Electric motor housing 9 Electric motor inner cover part 10 and 20 Bearing 12 Electric motor rotating shaft 13 Cavity 14 Rotating shaft 15 Core 18 Oil seal 22 Reduction gear cover part 23 Deceleration Machine housing 24 First planetary gear assembly 26 First gear 28 First shaft 30 First holder 32 Second shaft 34 Second gear 36 Third bearing 38 First sun gear 40 Second sun gear 42 Third sun gear 44 Second holder 46 First 4 bearing 47 reduction gear output shaft 52 electric motor 54 hydraulic motor 56 reduction gear 58 electric motor bottom plate 60 electric motor rotation shaft 62 cavity 63 hydraulic motor upper housing 64 hydraulic motor rotation shaft 66 hydraulic motor lid 67 cylinder block 68 hydraulic motor bottom plate 69 housing 70 oil Seal 72 Bearing 7 Cylinder chamber 76 Swash plate 77 Spherical head 78 Piston 80 Bearing 82 Oil seal 83 Reduction gear output shaft 84 Reduction gear housing 86 First sun gear 88 First planetary gear assembly 90 Second sun gear 92 First gear 94 First shaft 96 First Holder 98 Third sun gear 100 Second gear 102 Second shaft 104 Second holder 106 Third bearing 108 Fourth bearing

Claims (2)

In a hydraulic electric hybrid motor in which a hydraulic motor , an electric motor , and a speed reducer are arranged on one axis, and the electric motor is arranged between the hydraulic motor and the speed reducer ,
The electric motor is formed by being accommodated in an electric motor lid and an electric motor housing, and an electric motor rotating shaft having a cavity in the center is supported by two upper and lower bearings,
The cavity is a cylindrical cavity having a diameter larger than the diameter of the rotating shaft of the hydraulic motor,
The electric motor housing is connected to a speed reducer lid that is a lid of the speed reducer and a bottom thereof,
The electric motor rotating shaft of the electric motor penetrates freely through the center of the speed reducer lid, and further, the rotating shaft of the hydraulic motor having the same central axis passes through the cavity of the electric motor rotating shaft of the electric motor. And
A reduction gear housing is provided under the reduction gear lid, and a plurality of gears are housed together with a rotation shaft of the hydraulic motor and a motor rotation shaft of the electric motor,
The electric motor rotating shaft that is hollow inside the reduction gear housing has a first sun gear attached to an outer periphery of an end thereof, and the first sun gear is provided so as to mesh with a first planetary gear assembly. A second sun gear is attached to the outer periphery of the end of the rotation shaft, and the second sun gear is also provided so as to mesh with the first planetary gear assembly. In the first planetary gear assembly, the motor rotation shaft and the hydraulic motor are provided. The power with the rotating shaft of
The speed ratio of the first sun gear and the first planetary gear assembly and the speed ratio of the second sun gear and the first planetary gear assembly are proportional to the optimum rotational speeds of the motor rotation shaft and the hydraulic motor rotation shaft, respectively. The hydraulic motor and the electric motor are configured to be driven at different rotational speeds,
The second sun gear is provided so as to mesh with a first gear, and the first gear is connected to a first holder via a first shaft, and the first gear, the first shaft, and the first holder A second planetary gear assembly is configured;
The first holder is coupled to mesh with a third sun gear, the third sun gear is coupled to mesh with a second gear, and the second gear is coupled to the second holder via a second shaft. ,
The second holder is connected to a reduction gear output shaft, and the reduction gear output shaft is pivotally supported by a third bearing and a fourth bearing as a central axis . In a hydraulic electric hybrid motor in which an electric motor , a hydraulic motor, and a reduction gear are arranged on one axis, and the hydraulic motor is arranged between the electric motor and the reduction gear ,
The hydraulic motor has a housing formed of a hydraulic motor lid, a hydraulic motor upper housing, and a hydraulic motor bottom plate, and includes a hydraulic motor rotary shaft, a swash plate, and a piston inside the hydraulic motor rotary shaft. Passes through the center hole of the swash plate, is rotatably supported by a hydraulic motor upper housing via a bearing, and further, the hydraulic motor rotating shaft extends from the front end surface of the cylinder block. The hydraulic motor rotating shaft has a cavity in the center and is supported by a bearing provided on the hydraulic motor bottom plate ,
The cavity is a cylindrical cavity having a diameter larger than the diameter of the motor rotating shaft,
The hydraulic motor bottom plate also has a function as a lid of the speed reducer. An electric motor that has a hydraulic motor rotating shaft that freely passes through the center of the hydraulic motor bottom plate and that has the same central axis in the cavity of the hydraulic motor rotating shaft. The motor rotating shaft penetrates freely,
A reduction gear housing is provided under the hydraulic motor bottom plate, and a plurality of gears are housed together with the rotating shaft of the hydraulic motor and the rotating shaft of the electric motor.
The hydraulic motor rotating shaft that is hollow inside the speed reducer housing has a first sun gear attached to an outer periphery of an end thereof, and the first sun gear is provided so as to mesh with a first planetary gear assembly. A second sun gear is attached to the outer periphery of the end of the rotation shaft, and the second sun gear is also provided so as to mesh with the first planetary gear assembly. In the first planetary gear assembly, the rotation shaft and the electric motor The power with the rotating shaft of
The speed ratio of the first sun gear and the first planetary gear assembly and the speed ratio of the second sun gear and the first planetary gear assembly are proportional to the optimum rotational speeds of the hydraulic motor rotating shaft and the rotating shaft of the electric motor, respectively. The electric motor and the hydraulic motor are configured to be driven at different rotational speeds,
The second sun gear is provided so as to mesh with a first gear, and the first gear is connected to a first holder via a first shaft, and the first gear, the first shaft, and the first holder A second planetary gear assembly is configured;
The first holder is coupled to mesh with a third sun gear, the third sun gear is coupled to mesh with a second gear, and the second gear is coupled to the second holder via a second shaft. ,
The second holder is connected to a reduction gear output shaft, and the reduction gear output shaft is pivotally supported by a third bearing and a fourth bearing as a central axis .

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