RU2692298C1 - Hydrostatic transmission for multi-drive vehicle - Google Patents

Hydrostatic transmission for multi-drive vehicle Download PDF

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Publication number
RU2692298C1
RU2692298C1 RU2018123450A RU2018123450A RU2692298C1 RU 2692298 C1 RU2692298 C1 RU 2692298C1 RU 2018123450 A RU2018123450 A RU 2018123450A RU 2018123450 A RU2018123450 A RU 2018123450A RU 2692298 C1 RU2692298 C1 RU 2692298C1
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hydraulic
lines
adjustable
pumps
pressure
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RU2018123450A
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Russian (ru)
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Дмитрий Леонидович Карелин
Алексей Владимирович Болдырев
Алексей Михайлович Белоусов
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федеральное государственное автономное образовательное учреждение высшего образования "Казанский (Приволжский) федеральный университет" (ФГАОУ ВО КФУ)
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00Arrangement or mounting of transmissions in vehicles
    • B60K17/34Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles
    • B60K17/356Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having fluid or electric motor, for driving one or more wheels
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H39/00Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution
    • F16H39/04Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution with liquid motor and pump combined in one unit
    • F16H39/06Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution with liquid motor and pump combined in one unit pump and motor being of the same type

Abstract

FIELD: machine building.SUBSTANCE: invention relates to hydraulic volumetric transmissions. Hydrostatic transmission comprises pump station consisting of two groups of high pressure pumps with controlled working volume and adjustable make-up pumps, safety valves, suction filters, drain filters, heat exchangers, check valves. Adjustable radial-plunger hydraulic motors are connected to groups of controlled high-pressure pumps by supply and drain main hydraulic lines, as well as supply and drain hydraulic lines of hydraulic motors through valves of liquid supply shutoff. Feeding main hydraulic lines are connected to each other by bypass lines with check valves installed in them, and also connected to hydraulic control valve, controlled by liquid pressure of same supply main hydraulic lines. Actuating hydraulic lines of the hydraulic control valve are connected to the appropriate regulators of feeds of groups of high-pressure pumps, make-up pumps and parallel with the hydraulic tank through uncontrolled hydro-throttles. Hydraulic accumulators are connected to supply main lines. Hydraulic braking valves with duplicated pneumatic and electric control are arranged between drain main lines and suction main hydraulic lines. In the wheel drive mechanisms connected to the hydraulic motors, there are disc parking brakes, locked by springs and opened by pneumatic chambers. Air cavities of pneumatic chambers are interconnected with two-position pneumatic valve by pneumatic main line.EFFECT: improvement of emergency stop of vehicle is achieved.1 cl, 2 dwg

Description

The invention relates to transport machinery, namely, hydraulic volumetric transmissions, and can be used in multi-drive vehicles.

Known hydrostatic transmission of a transport machine [1], containing a pumping station consisting of main and make-up pumps driven by the engine of the machine, hydraulic motors connected to the pumping station by main hydraulic lines forming a circulation hydraulic circuit, and an independent pump with electric drive, the discharge cavity of which connected to the hydraulic circuit formed by the main hydrolines, additionally equipped with a pressurized hydraulic tank with a device for filling it with an air terminal compressed air from the pneumatic system of the machine, containing a shut-off valve, compressed air pressure regulator in a sealed hydraulic tank with a safety valve and a manually operated vacuum valve for releasing compressed air from a sealed hydraulic tank, a manual two-way valve for alternating hydraulic connection of the suction cavity of an independent pump, electrically operated, with a sealed hydraulic tank and with a device for filling it with working fluid, a check valve located in the drain the hydraulic lines at the inlet are a sealed hydraulic tank, and a manually operated shut-off valve located in the suction hydraulic line at the outlet of the sealed hydraulic tank.

The closest to the stated technical solution, the prototype, is a hydro-volumetric transmission [2], containing a pumping station consisting of high-pressure pumps and make-up pumps, variable-displacement hydraulic motors for driving wheels of the machine, connected to high-pressure pumps by hydraulic lines that form circulation hydraulic contours, valves with forced control for communication of the hydraulic circuits of the drive of the extreme wheels of the machine with the hydraulic circuit of the drive of the middle wheels , and in each hydraulic circuit with the main hydrolines are connected bypass hydrolines, in which discharge valves are located, in which the cavity in front of the locking element is connected to one of the main hydraulic lines, and the cavity behind the locking element is connected through the choke to the same main hydraulic line and through a check valve communicated with sewage line, in which there is a pilot valve, controlled by electrical means, connected to the source of electrical current, by an electrical circuit, in The switch houses the switching element of the relay connected to the electric control circuit of the pneumatic valve, which informs the pneumatic chambers of switching off the parking brake to a source of compressed air and with which electric means for changing the working volume of the hydraulic motors of all hydraulic circuits are connected via a diode.

The disadvantages of the prototype [2], as in the case of the analogue of [1], is that the implementation of the process of “hydraulic” braking due to full-flow throttling of the liquid through safety valves with the maximum volume of adjustable hydraulic motors is impossible, since the total flow through the hydraulic motors will be greater than the maximum pump flow, this circumstance does not ensure smoothness and high braking power for an emergency stop of a large vehicle mass, using for this all the available tons technical capabilities of hydromotors in full.

A possible violation of the integrity of the main hydrolines and hydrolines of the drive circuit of the adjustable radial-plunger hydraulic motor-wheels due to external influence completely destroys the hydrovolume transmission due to leakage of the working fluid, which limits the areas of operation of the multi-drive vehicle.

The aim of the claimed invention is to develop a hydrostatic transmission, providing smooth and high braking power for an emergency stop of a large vehicle mass, using for this purpose all the available technical capabilities of hydraulic motors in full, protected from leakage in violation of the integrity of the main hydrolines and hydraulic circuits of the drive of an adjustable plunger radial hydraulic motor wheels

The goal is achieved by the fact that in a hydrovolume transmission of a multi-drive vehicle equipped with parking brakes, springs included and pneumatic chambers switched off, containing a pumping station consisting of groups of adjustable high-pressure pumps and adjustable make-up pumps driven by a heat engine, safety valves, filters, valves braking and heat exchangers, adjustable radial-plunger hydraulic motor-wheels with rotational direction regulators are connected The main hydraulic lines with adjustable high-pressure pumps for supplying and discharging the working fluid and forming several circulation hydraulic circuits according to the present invention, supplying main hydraulic lines of each circulation circuit are interconnected by flow hydraulic lines through check valves and with a valve controlled by pressure of these main hydraulic lines, one the hydraulic line of the said distributor is hydraulically connected to the feed regulators of the first groups of adjustable high-pressure pumps, and the other executive hydroline is hydraulically connected to the feed regulators of the second group of adjustable high-pressure pumps, each hydraulic drive circuit of an adjustable plunger radial motor-wheel contains a fluid supply cut-off valve, through one part of which the flow hydroline passes, and through the other drain the hydroline, at the same time the valve is controlled by the pressure of the discharge hydroline, in each hydraulic circuit of groups of adjustable high-pressure pumps, giving and suction main hydraulic line connected between a bleed hydraulic line containing a check valve that allows fluid to flow only from the suction main hydraulic line to the feed, wherein the set of overflow hydraulic line and the suction main hydraulic line defined therein braking valve and the heat exchanger, form the additional circulation braking circuit.

Analysis of the known technical solutions in this field of technology has shown that the proposed hydrostatic transmission for a multi-drive vehicle has distinctive features that are absent in the analogues. In the aggregate, the listed distinctive essential features make it possible to obtain a new technical result: to provide greater braking power for an emergency stop of a large vehicle mass, using for this purpose all the available technical capabilities of the hydraulic motors in full, protecting hydraulic transmission from leakage of the working fluid in violation of the integrity of the main hydrolines and hydraulic contours drive adjustable plunger radial hydraulic motor-wheels.

The invention is illustrated by the hydraulic concept of the hydraulic system hydrostatic transmission (Fig. 1).

Numbers in the diagram denote:

1 - the first group of adjustable pumps,

2 - the second group of adjustable pumps,

3.4 - make-up pumps,

5-10 - safety valves,

11, 12 - suction filters

13, 14 - drain filters

15, 16 - heat exchangers,

17-22 - check valves,

23-30 - adjustable radial-plunger hydraulic motors,

31-38 - regulators of the direction of rotation of the hydraulic motors,

39, 40 - feeding main lines,

41, 42 - drain main hydrolines,

43-50 - fluid cutoff valves,

51, 52 - bypass hydroline,

53, 54 - check valves,

55 - the valve

56, 57 - executive hydraulic lines of the hydraulic distributor,

58, 59 - unregulated hydrothrottles,

60, 61 - suction trunk lines,

62, 63 - overflow lines,

64, 65 - hydroaccumulators,

66, 67 - hydraulic braking valves,

68-75 - disc parking brakes,

76-83 - spring

84-91 - pneumocameras,

92 - on-off pneumatic valve,

93 - pneumatic line

94 - source of compressed air

95-102 - feed hydrolines of hydraulic motors,

103-110 - drain hydrolines of the hydraulic motors.

The proposed hydrostatic transmission contains a pumping station consisting of two groups of 1, 2 high-pressure pumps with adjustable displacement (figure 1) and adjustable make-up pumps 3, 4, driven by a heat engine, safety valves 5-10, suction filters 11, 12 , drain filters 13, 14, heat exchangers 15, 16, check valves 17-22.

Adjustable radial-plunger hydraulic motors 23-30 with built-in regulators of rotation direction 31-38 are connected with groups of adjustable high-pressure pumps 1, 2 feed 39, 40 and drain 41, 42 main hydraulic lines, as well as feed 95-102 and drain 103-110 hydrolines of the hydraulic motors through the valves of liquid supply cut-off 43-50, while all of them together form several circulation hydraulic circuits.

For example, for a vehicle with an 8 × 8 wheel arrangement, the hydraulic motors 23, 27 are designed to drive the 1st axle, the hydraulic motors 24, 28 - the 2nd axle, the hydraulic motors 25, 29 - the 3rd axle, the hydraulic motors 26, 30 - 4 th axis of the vehicle in the order indicated in figure 2.

The supply main hydrolines 39, 40 are interconnected by bypass hydrolines 51, 52 with check valves 53, 54 installed in them, and also connected to a hydraulic distributor 55 controlled by the fluid pressure of the same supply main hydraulic lines 39, 40. Executive hydraulic lines 56, 57 of the hydraulic distributor 55 connected with the corresponding feed regulators groups of high-pressure pumps 1, 2, make-up pumps 3, 4 and in parallel with the hydraulic tank through unregulated hydrothrottles 58, 59.

Non-return valves 21, 22 allow liquids, if necessary, to flow through overflow hydrolines 62, 63 from suction main hydrolines 60, 61 into supply main hydrolines 39, 40, respectively.

To compensate for leaks in the hydraulic circuits and prevent cavitation, the liquid from the make-up pumps 3.4 can be supplied either to the supply main lines 39, 40 via check valves 17, 18, or in the suction lines main lines 60, 61 through check valves 19, 20, respectively.

Safety valves 5, 6 limit the maximum discharge pressure of the make-up pumps 3, 4, safety valves 7, 8 protect the main hydraulic lines 39, 40 from overload, and safety valves 9, 10 protect the main hydraulic lines suction lines 60, 61 from overload.

Hydraulic accumulators 64, 65 are connected to the feed main lines 39, 40 for damping pressure pulsations in the hydraulic system.

Hydraulic braking valves 66, 67 with duplicated pneumatic and electric control are located between the drain main hydrolines 41, 42 and suction main hydrolines 60, 61, respectively, with duplicate pneumatic and electric control, which decelerate the hydraulic motors 23-30 by creating back pressure in the drain main hydraulic lines 41, 42 by throttling the fluid.

In the wheel drive mechanisms connected to the hydromotors, there are disc parking brakes 68-75, closed by springs 76-83 and opened by pneumatic chambers 84-91, respectively. The air cavities of these pneumatic chambers communicate with the on-off pneumatic valve 92 by the pneumatic line 93 for their communication alternately with the source 94 of compressed air and with the atmosphere.

The proposed hydrostatic transmission works as follows.

In the initial position, with the engine off, the electromagnet of the two-position pneumatic valve 92 is disconnected, and the pneumatic chambers 84-91 are communicated with this pneumatic valve to the atmosphere, as a result of which the parking brakes 68-75 are closed by springs 76-83 and the vehicle does not move. The maximum working volumes of the hydraulic motors are 23-30. Hydraulic brake valves 66, 67 are closed.

Before starting the engine, hydraulic brake valves 66, 67 are applied by applying an electric or pneumatic signal to the “open” position, and pump groups 1, 2 to the “zero” displacement position.

After starting the engine working volumes and, consequently, the supply of make-up pumps 3, 4 become maximum. At the same time, the groups of adjustable pumps 1, 2 of high pressure, which are set to the “zero” working volume, provide unloading of the engine. The working fluid is pumped by make-up pumps 3, 4 through check valves 17-20 to supply 39, 40 and suction 60, 61 main hydraulic lines to hydraulic accumulators 64, 65 and further through open hydraulic brake valves 66, 67 to drain main hydraulic lines 41, 42 to valves liquid supply cutoffs 43-50 and the direction of rotation regulators 31-38 hydraulic motors 23-30. In this case, the cut-off valves 43-50 remain in the closed position, because the pressure of the injected fluid in the supply 39, 40 and drain 41, 42 main hydraulic lines, therefore, the input and output regulators of the direction of rotation of the motors 31-38 are the same. When this motor remains mechanically braked under the action of the parking brakes 68-75. After reaching the pressure in the hydraulic system, which corresponds to the setting of safety valves 5, 6, the make-up pumps 3, 4 drain the working fluid through these valves into the hydraulic tank.

Before the start of the movement, the signals to the hydraulic brake valves 66, 67 first stop, and they switch to the “closed” position, then the corresponding electric or pneumatic signals are sent to groups of adjustable pumps 1, 2 of high pressure, in which the positions of the regulators are set, the corresponding their minimum working volume and, accordingly, the minimum flow, while the pressure in the system rises to the maximum value. The pneumatic valve 92 then communicates pneumatic chambers 84-91 with a source of compressed air 94, i.e. with the pneumatic system of the vehicle, as a result of which the parking brakes 68-75 open with pneumatic chambers. In parallel with the opening of the pneumatic chambers of the disk parking brakes 68-75, the controlling electric or pneumatic signal places the hydraulic braking valves 66, 67 into the "open" position, thereby circulating the fluid through the hydraulic motor-wheels 23-30, while in the drain hydraulic lines of the hydraulic motors 103- 110 before the cut-off valves 43-50, the pressure becomes greater than in the drain main hydraulic lines, and they switch to the “open” position.

After the start of the vehicle, the corresponding control electrical or pneumatic signal from the regulators of pump groups 1, 2 is removed, which leads to an increase in their feeds. Pumps 1, 2 supply fluid under pressure through the supply main lines 39, 40 to the valves of the liquid supply cut-off 43-50, the direction of rotation controllers 31-38 and the motors 23-30. Thereby, torques are created on the shafts of the hydraulic motors to drive the wheels of the vehicle. From the hydraulic motors 23-30 working fluid through the cut-off valves 43-50, drain main hydraulic lines 41, 42, heat exchangers 15, 16, drain filters 13, 14, suction main hydraulic lines 60, 61 returns to the high-pressure pumps 1, 2. Direction control rotation of the motors and, therefore, the direction of movement of the vehicle is provided by switching the position of the valve 31-38. The change in the speed of rotation of the shafts of the motors and, consequently, the speed of the vehicle, is carried out by changing the working volumes of the groups of high-pressure pumps 1, 2 and hydromotors 23-30.

When a vehicle is moving on paved roads, each motor-wheel has the same load, therefore, the working volumes of the hydraulic motors 23-30 remain the same, and the working fluid supplied from the high-pressure pumps 1, 2 through the flow main lines 39-40 is proportionally distributed between the hydraulic circuits of each hydraulic motor 23-30, thereby evenly distributing the drive power between them.

When a vehicle moves on viscous soils and when turning due to independent control of changes in working volumes of hydraulic motors 23-30, the working fluid coming from high-pressure pumps 1 and 2 is distributed between the hydraulic circuits of each hydraulic motor so that when the load on one or several motors changes -wheel total power distributed to the remaining wheels.

In case of leakage of any of the supply or drain lines between the regulators of the direction of rotation of the hydraulic motors 31-38 and the corresponding cut-off valves 43-50, for example, the hydraulic line 95 or 103, a pressure drop in the circuit of the hydraulic motor 23 closes the cut-off valve of the liquid supply 43, preventing further loss of the working fluid through the damaged hydraulic circuit.

If the leakage of any of the supply main hydrolines 39, 40, for example, hydroline 39, the pressure drop in it and in the control valve 55 connected to it, the control valve 55 causes the valve to switch to the left position. When this working fluid from the supply main hydroline 40 through the overflow hydroline 52, check valve 54, the valve 55, the executive hydroline 56 is directed under pressure to the feed regulators of the first group of adjustable high-pressure pumps 1 and the feed pump 3, as well as in parallel to the hydraulic tank through an unregulated hydraulic throttle 58. This leads to a reduction to zero values of the working volumes and feeds of the first group of high-pressure pumps 1 and of the make-up pump 3, preventing further losses of the working fluid. flow through the damaged hydraulic circuit. In this case, no torque is created on the shafts of the hydraulic motors 23-26, and the vehicle is driven by the corresponding hydraulic motors 27-30 of the working hydraulic circuit.

When braking the vehicle, the electric or pneumatic control signal from the hydraulic braking valves 66, 67 decreases and they gradually begin to close, carrying out the process of throttling the fluid coming from the drain main hydraulic lines 41, 42 to heat exchangers 15, 16, drain filters 13, 14 , in the suction main hydraulic lines 60, 61 of pump groups 1, 2. In parallel with this process, the control electric or pneumatic signal on the feed controllers of pump groups changes in 1, 2, high pressure is proportional to the drive power from the heat engine. In parallel with these processes, the maximum values of the working volumes of the hydraulic motors 23-30 are established, and they begin to operate in the mode of hydraulic pumps, pumping from the supply main hydraulic lines 39, 40 a significantly larger volume of liquid into the drain main hydraulic lines 41, 42, than pumping groups of pumps 1, 2. As a result, the fluid pressure in the suction main hydrolines 60, 61 becomes greater than in the supply main hydrolines 39, 40, therefore, part of the working fluid will flow over the overflow hydroline holes 62, 63 through check valves 21, 22 of the suction main hydraulic lines 60, 61 to feed hydraulic line trunk 39, 40, dissipat-

Figure 00000001
part of the energy of the working fluid in the heat. At the same time, a set of supplying 39, 40 main hydraulic lines, brake valves 66, 67, heat exchangers, overflow hydraulic lines 62, 63 with non-return valves form the corresponding additional circulation braking circuits. Thus, smoothness and high braking power of the vehicle is ensured.

To hold the vehicle in place, the parking brakes 68-75 are actuated, stopping the pneumatic signal to the two-position pneumatic valve 92. Then the pneumatic valve 92 separates the pneumatic chambers 84-91 with the source of compressed air 94 and informs them with the atmosphere through the pneumatic line 93. Parking locks brakes by means of springs 76-83 located in each pneumatic chamber.

The main feature of the proposed hydrovolume transmission is that the supply main hydraulic lines of each circulation loop are connected by bypass hydraulic lines through non-return valves, which are also communicated with the pressure controlled distributor of these main hydraulic lines, and the executive hydraulic lines of the said distributor are connected hydraulically to the supply regulators of the respective groups of adjustable high pressure pumps and make-up pumps that protect the hydraulic system from ut check hydraulic fluid by breakage of main feed hydraulic lines. Each hydraulic drive circuit of an adjustable plunger radial motor-wheel contains a pressure-controlled drain line of a fluid supply cut-off valve, through one part of which the drainage line passes and the other flow line passes through the other, which helps protect the hydraulic system from leakage of the working fluid of any transmission hydraulic motor . In addition, the sharing in the design of the transmission of cut-off valves and adjustable hydraulic motors leads to an increase in the visibility of a multi-drive vehicle on viscous soils due to the redistribution of load between the motor wheels. In each hydraulic circuit of groups of adjustable high-pressure pumps, the supply and suction main hydraulic lines are interconnected by an overflow hydroline containing a check valve, which allows the liquid to flow only from the main suction main hydraulic line to the main one. The additional braking circuit that is formed during this process, containing the indicated hydrolines, the braking valve and the heat exchanger, ensures smoothness and high braking power.

Thus, the technical problem of developing a hydrostatic transmission that provides smoothness and high braking power for an emergency stopping of a large vehicle mass is fully solved, using all available technical capabilities of hydraulic motors in full, protected from leaks when the integrity of the main hydraulic lines and hydraulic circuits of the drive is violated adjustable plunger radial hydraulic motor-wheels.

The proposed hydrostatic transmission for a multi-drive vehicle meets the condition of industrial applicability and can be made on standard equipment using previously mastered technologies.

Used sources

1. RF patent №2256564, IPC B60K 17/10. Priority of 12/25/2003. Published 07/20/2005. Description of the patent.

2. RF patent №2309056, IPC B60K 17/356. Priority dated March 6, 2006. Published 10/27/2007. Description of the patent.

Claims (1)

  1. Hydrostatic transmission for a multi-drive vehicle equipped with parking brakes, springs activated and pneumatic chambers deactivated, containing a pumping station consisting of groups of adjustable high-pressure pumps and adjustable make-up pumps driven by a heat engine, safety valves, filters, brake valves and heat exchangers, adjustable radial-plunger hydraulic motor-wheels with direction of rotation regulators associated with adjustable us high-pressure wasps by mainline lines for supplying and discharging working fluid and forming several circulation hydraulic circuits, characterized in that the supply mainline hydrolines of each circulation circuit are interconnected bypass lines via one-way check valves and with a distributor controlled by the pressure of these mainlines. the distributor is hydraulically connected to the supply regulators of the first group of adjustable pumps is high pressure and make-up pump, and the other executive line is hydraulically connected to the feed regulators of the second group of adjustable high-pressure pumps and a make-up pump, each hydraulic drive circuit of an adjustable plunger radial motor-wheel drive contains a liquid supply cut-off valve, and through the other - the drain line, while the valve is controlled by the pressure of the drain line, in each hydraulic circuit of groups of adjustable pumps high pressure, supply and suction main hydrolines are interconnected by an overflow hydroline containing a check valve, allowing fluid to flow only from the intake main hydroline to the supply, and the combination of the overflow hydroline and the intake main hydroline with the braking valve and the heat exchanger installed in it form an additional circulation circuit braking.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU819460A1 (en) * 1979-05-30 1981-04-07 Ленинградский Ордена Красного Зна-Мени Механический Институт Hydrostatic transmission of multi-axid vehicles
RU2309056C1 (en) * 2006-03-06 2007-10-27 Открытое акционерное общество "Инновационная фирма "НАМИ-СЕРВИС" Wheeled-vehicle multicircuit hydrostatic transmission
RU129181U1 (en) * 2012-11-08 2013-06-20 Открытое акционерное общество "АМКОДОР" - управляющая компания холдинга" (ОАО "АМКОДОР" - управляющая компания холдинга") Hydraulic volume drive of a self-propelled machine
US9592733B2 (en) * 2014-10-29 2017-03-14 J. C. Bamford Excavators Limited Working machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU819460A1 (en) * 1979-05-30 1981-04-07 Ленинградский Ордена Красного Зна-Мени Механический Институт Hydrostatic transmission of multi-axid vehicles
RU2309056C1 (en) * 2006-03-06 2007-10-27 Открытое акционерное общество "Инновационная фирма "НАМИ-СЕРВИС" Wheeled-vehicle multicircuit hydrostatic transmission
RU129181U1 (en) * 2012-11-08 2013-06-20 Открытое акционерное общество "АМКОДОР" - управляющая компания холдинга" (ОАО "АМКОДОР" - управляющая компания холдинга") Hydraulic volume drive of a self-propelled machine
US9592733B2 (en) * 2014-10-29 2017-03-14 J. C. Bamford Excavators Limited Working machine

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