US20140322044A1 - Hydraulic transmission device suitable for constituting a compact hydraulic starter motor - Google Patents
Hydraulic transmission device suitable for constituting a compact hydraulic starter motor Download PDFInfo
- Publication number
- US20140322044A1 US20140322044A1 US14/122,592 US201214122592A US2014322044A1 US 20140322044 A1 US20140322044 A1 US 20140322044A1 US 201214122592 A US201214122592 A US 201214122592A US 2014322044 A1 US2014322044 A1 US 2014322044A1
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- United States
- Prior art keywords
- pump
- casing
- drive member
- motor
- fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
- F03C1/04—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement
- F03C1/047—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement the pistons co-operating with an actuated element at the outer ends of the cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/002—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for driven by internal combustion engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/26—Reciprocating-piston liquid engines adapted for special use or combined with apparatus driven thereby
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
- F04C11/005—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of dissimilar working principle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C2/18—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N7/00—Starting apparatus having fluid-driven auxiliary engines or apparatus
- F02N7/06—Starting apparatus having fluid-driven auxiliary engines or apparatus the engines being of reciprocating-piston type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N7/00—Starting apparatus having fluid-driven auxiliary engines or apparatus
- F02N7/08—Starting apparatus having fluid-driven auxiliary engines or apparatus the engines being of rotary type
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Reciprocating Pumps (AREA)
- Hydraulic Motors (AREA)
Abstract
A hydraulic transmission device for a machine, including a declutchable hydraulic motor having radial pistons, and including a cam that is secured to a casing, and a cylinder block and an internal fluid distributor that are disposed in the casing; a hydraulic pump including a drive member; and fluid exchange couplings; in which device the casing and the distributor are mounted to rotate relative to a stationary support about an axis of rotation, whereas the cylinder block is fastened to said support. In some embodiments, the drive member of the pump is constrained to rotate with the casing of the motor, and in that a delivery orifice of the pump is connected to one of said couplings.
Description
- The present invention relates to a hydraulic transmission device for a machine, which device comprises:
-
- a hydraulic motor declutchable by dog clutch having radial pistons, and including a cam that is secured to a casing, and a cylinder block and an internal fluid distributor that are disposed in the casing;
- a hydraulic pump including a drive member; and
- a plurality of fluid exchange couplings;
- in which device the casing and the distributor are mounted to rotate relative to a stationary support about an axis of rotation, whereas the cylinder block is fastened to said support.
- The term “stationary” support is used herein to mean a support that is a portion of the device that does not rotate. The support is therefore designed to be stationary relative to the machine. It mechanically holds the cylinder block and more generally the hydraulic motor on the machine. Preferably, the cylinder block is fastened rigidly to the support.
- The casing is the casing of the hydraulic motor; in particular, it houses the cylinder block and the fluid distributor.
- The fluid exchange couplings are couplings via which the device exchanges fluid with other hydraulic components. For example, the couplings are usually connected to a fluid reservoir or to a fluid accumulator, via fluid feed and/or fluid discharge ducts.
- The invention relates more particularly to a hydraulic transmission of the above-mentioned type that can be used to drive a machine member or a tool rapidly in rotation, with drive of which member or tool then being taken over by another motor or engine above a certain speed threshold. In particular, the machine or a tool may have high inertia.
- In particular, such devices are used to serve as starter motors for internal combustion engines, e.g. diesel engines.
- One known solution for obtaining a starter motor consists in using an electric motor powered by a battery. However, electric starter motors and batteries are not suitable for very large numbers of starting operations. Today, in order to save fuel, it is desired to be able to stop an engine as soon as it is no longer needed, even if it is then re-started almost immediately afterwards. With such use, the number of starts to which the engine is subjected is very high: thus, the number of starts that the starter motor needs to perform is considerably higher than the number of starts that an electric starter motor can perform.
- A known alternative consists in using a hydraulic motor as a starter motor. Such a motor can constitute a starter motor that is effective for an internal combustion engine, particularly when the internal combustion engine serves to drive a load having high inertia: a hydrostatic starter motor has very high power density (per unit volume), which enables it to be more compact than an electric starter motor. Using a hydrostatic motor for a starter motor is also advantageous because it is robust, and has a long life, enabling it to perform a large number of starts.
- A hydraulic motor can, in particular, be used as a starter motor for an internal combustion engine, such as, for example, a vehicle engine, in particular for a vehicle of the urban transport type, having a large weight. When the engine needs to supply torque for moving the vehicle that is zero or low, the engine is then used to fill an accumulator with fluid under pressure by means of a pump. When the vehicle is at a standstill or when the engine is idling, said engine is switched off; by means of the accumulator, the engine is re-started by the hydraulic motor, actuated by the fluid coming from the accumulator.
- A known embodiment of a hydraulic starter motor for a diesel engine is shown in
FIG. 1 . In this figure, the valves, the monitoring means, the control means, the safety means, etc. are not shown, unless otherwise indicated. -
FIG. 1 shows adiesel engine 10 provided with ahydraulic transmission device 12 serving as a starter motor for the engine. - The
device 12 comprises anaccumulator 14 for accumulating pressurized fluid, a pump 16, ahydraulic motor 18, and areservoir 20 of fluid at atmospheric pressure. - The
accumulator 14 is connected to thehydraulic motor 18 via aduct 22 for the purpose of feeding themotor 18 with pressurized fluid in order to start theengine 10. When themotor 18 is fed in this way, the fluid, after passing through themotor 18, is directed towards thereservoir 20 via adischarge duct 24. Thecasing 26 of themotor 18 is mounted in the end of the crankshaft of theengine 10. Thecasing 26 is a rotary casing that is the outlet member of themotor 18. Thus, when themotor 18 is fed with pressurized fluid, thecasing 26 starts rotating and, in turn, drives the crankshaft of theengine 10 in rotation, thereby starting theengine 10. - In addition, a
belt 28 that engages in external grooves formed respectively in thecasing 30 of the pump 16 and in thecasing 26 of themotor 18, constrains the pump 16 and themotor 18 to rotate with each other. For this reason, when the crankshaft of themotor 10 rotates, thecasing 26 of themotor 18 and thecasing 30 of the pump 16 also rotate. - In addition, the pump 16 is connected to the
reservoir 20 via asuction feed duct 32, and to theaccumulator 14 via afilling duct 34. - As indicated above, throughout all of the operating stages of the
engine 10, the pump 16 is actuated (i.e. itscasing 30 is driven in rotation). Thus, while theengine 10 is running, the pump 16 pumps fluid into thereservoir 20 in such a manner as to fill theaccumulator 14, via theducts valve 36 interposed between theaccumulator 14 and theducts - The
device 12 operates as follows: - When the
engine 10 is off, theaccumulator 14 is, in principle, full. - In order to start the
engine 10, theaccumulator 14 is caused to be emptied into thereservoir 20 via themotor 18. The pressurized fluid from the accumulator actuates themotor 18; thecasing 26 of themotor 18 starts rotating, thereby, in turn, causing the crankshaft of theengine 10 to rotate, and causing theengine 10 to start. Theengine 10 is then operating. - While the
engine 10 is operating, and via thebelt 28, thecasing 26 of themotor 18 drives thecasing 30 of the pump 16. The pump 16 actuated in this way then recharges theaccumulator 14 with pressurized fluid. - In general, the
hydraulic starter system 12 acts in addition to an electric starter system. - Although that
hydraulic device 12 operates satisfactorily, it is relatively voluminous, which makes it difficult to install on many pieces of equipment, in particular on many engines such as theengine 10. - More generally, known hydraulic motors and the components of the circuit necessary for feeding them are not optimized for being used as starter motors for vehicle engines or other types of machinery. Hydraulic motors require large numbers of pipes to be provided, a booster pump to be installed, and that booster pump needs to be driven by an outlet shaft of the engine or via an additional electrical drive. As a result, installing a hydraulic motor, and the circuit that accompanies it, as a starter motor for an engine is an operation that is complicated.
- However, an example of a hydraulic starter motor that offers a certain amount of compactness is disclosed by Document GB 1 395 901.
- That document discloses a hydraulic starter motor associating a hydraulic motor having radial pistons with a pump making it possible to charge an accumulator. The motor is of the type having a stationary casing, with a rotary shaft to which the cylinder block is fastened. The outlet member of the motor is a coupling part that is fastened at the end of the shaft of the motor. The presence of this part induces additional length and additional complexity for the hydraulic starter motor.
- When the pressure inside the accumulator becomes low, a valve device makes it possible to activate a hydraulic clutch interposed between the shaft of the motor and the drive member of the pump. The shaft of the motor then drives the pump; said pump rotating then makes it possible to recharge the accumulator.
- Thus, although the motor is placed in the vicinity of the pump, that starter motor suffers from the drawback of being large in size and highly complex, in particular because of the clutch interposed between the motor and the pump.
- An object of the invention is thus to propose an improved hydraulic transmission device of the type presented in the introduction, and that is suitable for constituting a hydraulic starter motor that is relatively simple and that is compact by being coupled to an accumulator and to a reservoir of fluid.
- This object is achieved in the device described in the introduction by the facts that the drive member of the pump is constrained to rotate with the casing of the motor, and that a delivery orifice of the pump is connected to one of the couplings of the device.
- By means of this connection, the pump is suitable for delivering fluid under pressure via said coupling; as a result, the pump is suitable for being connected to an accumulator in order to fill it with fluid under pressure.
- In addition, the pump is driven in rotation by the casing (directly or indirectly); it can thus be arranged in the immediate vicinity of the motor and be incorporated therein.
- In addition, since the casing is a rotary casing, it constitutes, directly or indirectly, the outlet member of the starter motor, which makes it unnecessary to use a coupling part that is fastened at the end of the outlet shaft of the motor, as in the above-described prior art example.
- Advantageously, the invention procures a device that is not only compact, but that is also inexpensive to produce, due to the reduced length of the connecting ducts between the pump and the hydraulic motor, due to the reduction in the number of connection components, and due to a reduced number of operations for assembling it onto engines, including a reduction in the number of hydraulic interconnections to be made.
- In the above definition, the expression “constrained to rotate with” means constrained continuously to rotate with. Therefore, no clutch is interposed between the pump and the motor, and the pump is driven continuously whenever the motor is operating. The absence of any clutch procures considerable simplification compared with the above-mentioned prior art example.
- In the device of the invention, the motor may be fastened to the support in various manners.
- The support firstly holds the cylinder block. In addition, the casing and the distributor must be arranged in such a manner as to be able to rotate relative to the cylinder block. Finally, the distributor must, in addition, be situated facing the cylinder block in order to distribute fluid to the cylinders of the cylinder block.
- In view of these technical constraints, the support may, in particular, be implemented in the following two embodiments:
- In a first embodiment, the support has a preferably substantially cylindrical portion about which the distributor is arranged.
- This substantially cylindrical portion may, in particular, advantageously be extended inside the cylinder block in order to enable the cylinder block to be held. The support may then be in the form of a support shaft (while being arranged essentially in the form of a shaft), this configuration presenting the advantage of being very compact. The substantially cylindrical portion may be of any shape that is generally circularly symmetrical, and that is sufficiently elongate to enable the distributor and, where applicable, the cylinder block to be disposed around the substantially cylindrical portion. This portion may thus, for example, be of generally conical shape.
- In this embodiment, the cylinder block is held by the inside (when the support forms a shaft passing through the inside of the cylinder block) or at least in the vicinity of its axis of rotation. The distributor is disposed around the support. This embodiment is extremely compact while procuring effective mechanical holding of the cylinder block.
- In a second embodiment, the support and/or the cylinder block is provided with an axial bore formed along the axis of rotation of the motor, inside which bore the distributor is disposed. The vicinity of the axis of rotation of the motor, in which vicinity the distributor is situated is then used for the fluid exchanges of the motor. Conversely, the volume situated radially around the distributor is occupied by the support and/or by the cylinder block in order to fasten the cylinder block to the support. The cylinder block is thus fastened to the support via its outside periphery.
- This embodiment is advantageous if the motor is subjected to large bending forces, tending to misalign the cylinder block relative to the support.
- The hydraulic motor generates drive torque (or braking torque) that should be transmitted to the machine to which the device is fastened. In order to enable the torque to be transmitted, the support may advantageously have a portion in the form of an arm through which at least one duct passes and which extends in a direction that is substantially perpendicular to the axis of rotation. Due to its shape, the portion in the form of a support arm is fastened to a stationary portion of the machine and thus serves as a connection arm, preventing any undesired rotation of the device relative to the machine.
- Finally, the device of the invention may be incorporated into a starter system for a machine having a rotary drive member. In which case, the starter system includes a device as defined above and said drive member, the casing being constrained to rotate with said drive member. Preferably, the casing may be disposed in a portion of the rotary drive member. The machine to be driven may, for example, be an internal combustion engine, in particular a diesel engine.
- In the device of the invention, the pump may be arranged relative to the support in various manners.
- In one embodiment, an axis of rotation of the drive member of the pump coincides with the axis of rotation of the hydraulic motor. Transmission of movement between the hydraulic motor and the pump may thus be achieved via simple mechanical members, since these two components have drive members that are aligned along the same axis.
- In one embodiment, the drive member of the pump is driven in rotation directly by the casing. The casing of the motor can then be the only rotary drive outlet member of the hydraulic motor, firstly to the pump and secondly to other components of the machine in which the device is incorporated (such as, for example, the crankshaft of the diesel engine of a vehicle).
- In one embodiment, the device includes a drive shaft that is constrained to rotate with the cam and that is suitable for actuating the pump. This drive shaft may pass through the inside of the cylinder block and/or be fastened to the casing, and/or be disposed inside the support at least in part.
- In one embodiment, the drive member of the pump is driven in rotation by a drive shaft that is fastened to the casing and that is disposed inside the support at least in part.
- These two embodiments make it possible, in particular, for the drive member of the pump to have an axis that coincides with the axis of rotation of the motor.
- In one embodiment, the pump is disposed inside the support at least in part and optionally entirely. The device is then particularly compact.
- Arranging the pump inside the support, at least in part, facilitates incorporation inside the support of certain ducts connected to the pump and/or to the motor.
- In one embodiment, the pump and the fluid exchange couplings are situated on the same side of the cylinder block of the motor, relative to the axis of rotation. This arrangement improves the compactness of the device.
- In one embodiment, relative to the axis of rotation, the distributor is interposed between the fluid exchange couplings and the cylinder block.
- In one embodiment, the device includes a drive shaft that is constrained to rotate with the cam, that passes through the inside of the cylinder block, and that is suitable for actuating the pump.
- The mechanical connection constraining the cam and the shaft to rotate with each other is thus formed on the side (relative to the cylinder block) opposite from the distributor and/or from the fluid exchange couplings of the device.
- The fluid distributor may also have any of the following characteristics, in isolation or in combination:
-
- it may be a rotary distributor;
- it may have a plane distribution face (in particular perpendicular to the axis of rotation);
- it may be disposed between the cylinder block and the pump, at least in terms of position relative to the axis of rotation.
- In one embodiment, at least an admission duct or a delivery duct of the pump and/or at least a feed duct or a discharge duct of the motor passes through the support. For example, a feed duct of the pump may be formed in the support and may connect an admission chamber of the pump to a coupling arranged on an outside surface of the support: thus, the pump is fed with fluid in a manner that is particularly simple and compact.
- In one embodiment, a discharge duct of the motor and a feed duct of the pump meet at a junction situated in the support. Thus, these ducts are advantageously arranged compactly, and the device may have only three external couplings or orifices. In one embodiment, a feed duct of the pump and/or a discharge duct of the motor is formed in the support shaft and connects a coupling arranged on an outside surface of the support shaft to an internal space of the casing. Preferably, this duct serves both as the feed for the pump and as the discharge for the motor, when the fluid being discharged from the motor is discharged into the internal space of the casing.
- In one embodiment, the fluid sucked up by the pump flows around the drive member of the pump before penetrating into the pump. It thus lubricates the drive member of the pump.
- In particular, integrating the pump into the support may, in particular, be performed in such a manner as to enable the support to be lubricated by means of the fluid present inside the casing of the hydraulic motor. To this end, in the above-mentioned embodiment including a drive shaft for driving the pump and disposed at least in part inside the support, a feed passage of the pump via which passage a fluid feeding the pump passes may be formed between the drive shaft and the support. Fluid passing through this passage cools and lubricates the support. In order to convey the fluid into the feed passage, a feed duct of the pump may be formed in the support and may connect an internal space of the casing to the feed passage.
- In one embodiment, the device may then include a fluid supply duct making it possible to inject a feed fluid for feeding the pump into said internal space; said internal space being, in addition, connected to said feed passage via a feed duct making it possible to feed the feed passage with fluid; an orifice of the feed duct in the internal space of the casing and an orifice of the supply duct in the internal space being disposed axially on either side of the cylinder block.
- The fluid supply duct may, for example connect a coupling arranged on an outside surface of the support to the internal space of the casing. This supply duct serves, in particular, to bring fluid feeding the pump (or a portion thereof) into the internal space. By disposing the orifice of the feed duct in the internal space of the casing and the orifice of the supply duct in the internal space axially on either side of the cylinder block, the feed fluid of the pump, coming from the fluid supply duct, is caused to sweep through the cylinder block (or at least to pass from one side of the cylinder block to the other) in order to come to feed the pump. This sweeping thus enables the cylinder block to be cooled effectively.
- In addition, when the motor is brought to rotate in one direction only, in one embodiment, the fluid discharge of the cylinder block takes place into an internal space of the casing. This enables the motor arrangement to be particularly simple. The feed of the motor may also be implemented very simply: a single annular groove can feed the motor with fluid. This single groove can be formed in an outside surface of the support.
- In order to incorporate the pump into the support, it is preferable to choose a pump that is as compact as possible. Preferably, a pump is chosen that has its largest transverse dimension that is perpendicular to the axis of rotation less than the diameter of the cylinder block, e.g. a gear pump. The pump can then, in general, be disposed entirely inside the support.
- As indicated above, the transmission device of the invention may, in particular be used for driving a rotary drive member of a machine in rotation. To this end, in one embodiment, in order to enable the casing to be coupled to a member to be driven, the casing has a flange, an external groove suitable for receiving a pulley belt, or else a set of teeth for receiving a chain or gearing. In a particularly advantageous arrangement, the casing may thus be fastened directly to one end of the crankshaft of an internal combustion engine.
- The invention can be well understood and its advantages appear more clearly on reading the following detailed description of embodiments that are shown by way of non-limiting example. The description refers to the accompanying drawings, in which:
-
FIG. 1 , described above, is a diagrammatic view of a diesel engine equipped with a known hydraulic device, serving as a starter motor; -
FIG. 2 is a diagrammatic view of a diesel engine equipped with a hydraulic device of the invention, serving as a starter motor; -
FIG. 3 is an axial section view of a first embodiment of a hydraulic device of the invention; -
FIG. 4 is a view of theFIG. 3 hydraulic device in section perpendicular to its axis; -
FIG. 5 is an axial section view of a second embodiment of a hydraulic device of the invention; -
FIG. 6 is a view of theFIG. 5 hydraulic device in section perpendicular to its axis; -
FIG. 7 is an axial section view of a third embodiment of a hydraulic device of the invention; and -
FIG. 8 is a view of theFIG. 7 hydraulic device in section perpendicular to its axis. -
FIG. 2 shows anengine 110 equipped with ahydraulic device 40 of the invention. Unless otherwise specified, theengine 110 and thedevice 40 are identical to theengine 10 and to thedevice 12 that are described above. Identical elements or elements having the same functions therefore bear the same numerical references in both figures, and are not described again below. - Implementing the invention in the
hydraulic device 40 makes it possible to obtain an arrangement that is much more compact, as shown inFIG. 2 , than in the example shown inFIG. 1 . In theFIG. 2 embodiment, thedevice 40 includes apump 44 that plays the same role as the pump 16; however, instead of being an external pump connected via a pulley to themotor 18, thepump 44 is an internal pump, incorporated in the hydraulic motor 42 (seeFIGS. 3 and 4 ). - In addition, coupling of the
hydraulic device 40 is simplified, and advantageously comprises only three ducts: -
- a
duct 124 connecting anexternal coupling 70 of themotor 42 to thereservoir 20; - a
duct 22 connecting theaccumulator 14 to afirst coupling 72 of themotor 42; and - a
duct 23 connecting theaccumulator 14 to asecond coupling 74 of themotor 42.
- a
- The
ducts accumulator 14 via avalve 136. -
FIGS. 3 and 4 are more detailed views of thedevice 40 that constitutes a first embodiment of the invention. - The
device 40 includes ahydraulic motor 42 into which ahydraulic pump 44 is incorporated. - The
motor 42 is a declutchable motor having radial pistons. It comprises: -
- a
casing 46 made up of three portions, namely acover 46A, alobed cam 46B, and adistribution casing 46C; - a
cylinder block 48 and afluid distributor 50 that are disposed in aninternal space 52 of thecasing 46; and - a support in the form of a
support shaft 54 to which thecylinder block 48 is fastened rigidly.
- a
- The
cylinder block 48 hascylinders 56 in whichpistons 58 are slidably mounted. Thepistons 58 are arranged in such a manner as to be capable of transmitting pressure to the inside surface of thecam 46B. - In known manner, the pressures exerted by the
pistons 58 enable themotor 42 to develop drive torque. The drive torque is transmitted by thecasing 46 that acts as an outlet member for themotor 42 to the equipment to which themotor 42 is mechanically coupled: In this example, the equipment is the crankshaft of theengine 110. - In order to transmit the torque generated by the
hydraulic motor 42 to thediesel engine 110, themotor 42 has aflange 60 formed over an outside circumference of thedistribution casing 46C. Theflange 60 is bolted onto the crankshaft of theengine 110. - The components that are internal to the
motor 42 are arranged in the following manner: - The
distributor 50 is connected rigidly to thedistribution casing 46C by means that are not shown. - In terms of axial position relative to the axis of rotation A, the
distributor 50 is interposed between thefluid exchange couplings cylinder block 48. This arrangement enables the feed fluid of the motor to be transferred directly from thecoupling 72 to thecylinder block 48 via thedistributor 50, thereby forming a circuit that is short. The same applies for the fluid discharge via thedistributor 50 transferring the fluid to the casing, thereby enabling the fluid to be removed directly via thecoupling 70. - In addition, the
pump 44 and thefluid exchange couplings cylinder block 48, relative to the axis of rotation A. This arrangement improves the compactness of the device. - In addition, the
fluid distributor 50 is a rotary distributor and has a plane distribution face, perpendicular to the axis of rotation 51. It is disposed between thecylinder block 48 and thepump 44. - The
pistons 58 are declutchable pistons. They are urged back into thecylinders 56 bysprings 62, when the pressure inside thecylinders 56 is less than the pressure prevailing in theinternal space 52 and when the difference between the two pressures exceeds a predetermined value that depends on thesprings 62. - The
casing 46 is held in position on thesupport shaft 54 byball bearings cylinder block 48. Thebearings casing 46 and thedistributor 50 in such a manner that they can rotate about the axis A of thesupport shaft 54. - The
pump 44 is a compact gear pump. In a manner known per se, and as shown inFIG. 4 , it has twotoothed wheels pump 44. - The largest transverse dimension D of the
pump 44, measured perpendicularly to the axis of rotation A is less than the diameter of the cylinder block and even than the radius of the cylinder block, thereby making it possible to incorporate thepump 44 without any particular difficulties into thesupport shaft 54. - The
pump 44 is mounted in a bore (a chamber) formed in thesupport shaft 54. It is held in position by itscover 45, which is fastened to the end surface of thesupport shaft 54 by ascrew 47. - The
cover 45 is incorporated into the volume of thesupport shaft 54, in a manner such that thepump 44 is fully incorporated into thesupport shaft 54. - It is disposed inside a
first end 54A of the support shaft, thecylinder block 48 being arranged around theopposite end 54B of the support shaft, and thedistributor 50 being placed between thecylinder block 48 and thepump 44. This arrangement makes it possible to place thepump 44 as close as possible to thedistributor 50 and thus to optimize the flow of fluid in thedevice 40. - The flow of fluid in the
device 40 is described below. - Two sub-assemblies mainly exchange fluid: the
motor 42 and thepump 44. - All of the exchanges of fluid of the
device 40 take place via threecouplings first end 54A of thesupport shaft 54. - For admission and delivery of fluid for the
pump 44, twoducts end 54A of the support shaft. Thepump admission duct 76 connects thecoupling 70 to theadmission chamber 441 of thepump 44. Thepump delivery duct 78 connects the delivery chamber 440 of thepump 44 to thecoupling 74. - For feeding fluid for the
motor 42, afeed duct 80 provided with a bend is formed in thesupport shaft 54. Thisduct 80 connects thecoupling 72 to anannular groove 75, formed in an outside circumference of thesupport shaft 54, inside thedistributor 50. - The
motor 42 operates as follows: - The fluid feeding the
motor 42, coming from theaccumulator 14 via theduct 22, is injected into thedevice 40 via thecoupling 72. It is injected into thegroove 75 via theduct 80. Thedistributor 50 hasfirst distribution ducts 82. These ducts convey the fluid from thegroove 75 tocylinder ducts 84 formed in thecylinder block 48, and via which the fluid is injected into thecylinders 56. - In a manner known per se, the
distributor 50, which is driven in rotation by thecasing 46, feeds thevarious cylinders 56 successively. Thepistons 58 are driven in turn by the pressure in thecylinders 56 for causing the cylinders to come out; the pressure that they exert on thecam 46B generates drive torque. Thus, the injection of pressurized fluid from theaccumulator 14 makes it possible to drive thecasing 46 in rotation, thereby causing theengine 110 to start, via theflange 60. - While the
pistons 58 are moving in, the fluid is removed from thecylinders 56 via thecylinder ducts 84; it is thus brought viasecond distribution ducts 86 into theinternal space 52 of thecasing 46. - A
duct 88 passing through thesupport shaft 54 connects the internal space of the casing to theduct 76. Thisduct 88 joins theduct 76 that serves to feed the pump, at a T-junction situated in the support shaft. This junction thus splits theduct 76 into two portions, namely anexternal portion 76′ connecting thecoupling 70 to the T-junction, and aninternal portion 76″ connecting the T-junction to the admission chamber of the pump 441 (FIG. 4 ). - The
duct 88 thus enables the fluid removed by the motor to be discharged from theinternal space 52 to the outside of the support shaft, via theduct portion 76′ and thecoupling 70. The fluid is directed from thecoupling 70 into thereservoir 20 via theduct 124. - The
pump 44 operates as follows: - The pump has a drive member or
part 90 that enables it to be driven. Thispart 90 forms a shaft to which thetoothed wheel 68A is fastened. The pump is disposed in thesupport shaft 54 in such a manner that the axis of thepart 90 coincides with the axis of rotation A of the motor. - In addition, the
device 40 has adrive shaft 92. Theshaft 92 is constrained to rotate with thecam 46B, via thecover 46A. For this purpose, theshaft 92 is fastened (by screw-fastening) to thecover 46A of themotor 42. Naturally, any other mode of fastening thedrive shaft 92 to thecover 46A may be used, such as, for example, a flattened drive finger having the shape of a screwdriver blade, etc. The axis of theshaft 92 also coincides with the axis of rotation A of the motor. - An axial cylindrical bore 94 is formed along the axis A in the
support shaft 54 so as to enable thedrive shaft 92 and thedrive part 90 to pass through. Thedrive part 90 is constrained to rotate with thedrive shaft 92 by means of adrive finger 96. Thedrive part 90 of the pump is therefore driven in rotation by thecasing 46, via thedrive shaft 92 and via thedrive finger 96. Thedrive finger 96 makes it possible, in particular, for limited axial movement to take place along the axis A between thedrive shaft 92 and thedrive part 90. Such movement may be necessary as a function of the relative expansions of theshaft 92 and of thepart 90. - Advantageously, the
shaft 92 makes it possible to transmit the movement imposed by the motor on thecam 46B to thedrive member 90 of thepump 44. This result is achieved by the fact that the shaft, connected to thecover 46A itself constrained to move with thecam 46B, connects said cover to thedrive member 90 of the pump, by passing through the inside of thecylinder block 48. - The mechanical connection constraining the cam and the shaft to rotate with each other is thus formed by the
cover 46A, situated on the side opposite from thedistributor 50 and from thefluid exchange couplings - The
pump 44 is supported by twobearings toothed wheels - When the pump is actuated, under the effect of the rotation of the gearing formed by the
wheels reservoir 20 via theduct 124 and via theduct 76. It is pumped by thetoothed wheels suction chamber 441 to the delivery chamber 440. It is thus delivered under pressure into theduct 78, and from there reaches theaccumulator 14 via theduct 23. The pump thus fills theaccumulator 14. -
FIGS. 5 and 6 show adevice 140 showing a second embodiment of the invention that is very similar to the first embodiment shown byFIGS. 3 and 4 . The difference between the first and second embodiments lies in the path of the feed fluid for feeding the pump. - The
hydraulic device 140 may be used as a hydraulic starter motor for an internal combustion engine, as in the first embodiment. It is incorporated into a motor in a manner exactly identical to the incorporation of thedevice 40 shown inFIGS. 2 to 4 . - Unless otherwise indicated, the second embodiment may be considered as being identical to the first embodiment. Identical elements or elements having the same functions therefore bear the same numerical references in both embodiments.
- In the second embodiment, the
support shaft 154 has the following differences relative to the support shaft of the first embodiment: - Firstly, as regards the
duct 76, only theexternal portion 76′ of said duct is formed. Thisportion 76′, in combination with theduct 88, forms a connection between thecoupling 70 and theinternal space 52 of thecasing 46. Conversely, in this second embodiment, theinternal portion 76″ of theduct 76 is not formed. There is therefore no direct communication between thecoupling 70 and theadmission chamber 441 of thepump 44. - It is through the
internal space 52 that the fluid feeding the pump passes. To this end, for feeding the pump, afeed duct 100 is bored between theinternal space 52 and thebore 94. Thisfeed duct 100 is formed in the vicinity of thecover 46A, and preferably as close as possible thereto. Theduct 100 enables fluid to pass from theinternal space 52 towards thebore 94. Inside thebore 94, anannular feed passage 102 is provided by means of clearance provided between firstly thesupport shaft 154 and secondly thedrive shaft 92 and thedrive part 90. This clearance is calculated in such a manner that the feed passagecross-sectional area 102 is sufficient for feeding the pump. - In addition, a
second feed passage 104 is provided at theend 154A of the support shaft that is on the same side as thepump 44. Thissecond passage 104 connects theannular space 102 to thesuction chamber 441 of thepump 44, and enables the fluid to pass through theannular space 102 to the chamber 44I, by going (radially) around the outside of the bearing 98B. - In this embodiment, the pump operates as follows: The fluid is sucked in by the pump from its
suction chamber 441. The sucked-up fluid penetrates into thesupport shaft 154 via thecoupling 70, goes via theducts 76′ and 88, via theinternal space 52 of the casing, via theduct 100, via thefeed passage 102, via thesecond feed passage 104, and finally into thesuction chamber 441. The advantage of this path is that the fluid sweeps through theinternal space 52 of the casing, and through theannular space 102 between thepassages block 48, thedrive shaft 92 and thedrive part 90. To this end, thepassage 100 is formed at theend 154B of the support shaft that is opposite from theend 154A that contains thepump 44; thus, the feed fluid of the pump travels through theannular passage 102 over nearly the entire length thereof, thus enabling thebore 94 to be lubricated and cooled in optimized manner. - The other aspects of the manner in which the
device 140 ofFIGS. 5 and 6 operates are identical to the aspects of thedevice 40 presented in the first embodiment. In the second embodiment, it can thus be observed that theducts ducts -
FIGS. 7 and 8 show adevice 240 illustrating a third embodiment of the invention that is very similar to the first two embodiments shown byFIGS. 3 to 6 . The specificity of the third embodiment relative to the first two embodiments is the arrangement of the support (254) and, as a result, of the fluid exchange ducts of the device. In spite of these differences, thedevice 240 operates substantially identically to the manner in which thedevices - Unless otherwise indicated, the third embodiment may be considered as being identical to the first embodiment. Identical elements or elements having the same functions therefore bear the same numerical references in the first, second, and third embodiments. However, certain elements of the third embodiment that are the subjects of specific description bear a numerical reference plus 200 relative to the element having the same function in the first embodiment.
- The
device 240 includes ahydraulic motor 242 into which ahydraulic pump 244 is incorporated. - The
motor 242 is a declutchable motor having radial pistons that comprises: -
- a
rotary casing 246 made up of threeportions screws 243, the casing having an axis of rotation A; - a
cylinder block 248 and afluid distributor 250; and - a
support 254.
- a
- The
support 254 formed in two portions, namely with ahead 256 that closes themotor 242 on a first side relative to the axis A (on the right ofFIG. 7 ), and aportion 258 in the form of a connection arm, that extends in a direction that is substantially perpendicular to the axis A. The end of thearm 258 may be fastened to a machine by means that are not shown for enabling thesupport 254 to provide a mechanical support for thedevice 240. In addition, twohydraulic fluid ducts 276 and 280 pass through thearm 258, whereby thesupport 254 provides, in addition, a fraction of the exchanges of fluid of themotor 242. - The
cylinder block 248 of themotor 242 is fastened to thesupport 254. For this purpose, it has a cylindricaltubular projection 249, which extends concentrically about the axis A on the first side of the cylinder block. The end of thisprojection 249 is fastened to thesupport 254 by means (not shown); theprojection 249 thus fastens the cylinder block on thesupport 254. - The
portion 246A of the casing forms a cover that closes themotor 242 on the second side of the cylinder block 248 (i.e. on the left side ofFIG. 7 ). Thisportion 246A includes acentral shaft 247 that extends along the axis A while going through abore 221 of axis A that is formed in the cylinder block. The end of theshaft 247 is situated inside theprojection 249 and supports thedistributor 250. The distributor is disposed inside abore 275 of axis A that is formed inside thetubular projection 249. This bore 275 forms a fluid exchange groove that has a function that is described in more detail below. - The
casing 246 is held relative to thecylinder block 248 viabearings casing 246 in such a manner that they can rotate about the axis A. Thebearing 264 is disposed in thebore 221 between thecylinder block 248 and theshaft 247, and thebearing 266 is disposed between the outside surface of theprojection 249 and the inside surface of thecasing portion 246C. - The
pump 244 is arranged inside thehead 256 of thesupport 254. It is identical to the above-describedpump 44, except for the shape of itsdrive part 290. The end of thedrive part 290 is arranged in such a manner as to be constrained to rotate with theshaft 247, and thus with thecasing 246. The junction between theshaft 247 and thepart 290 is formed by ajunction part 291. - The fluid exchanges of the
device 240 take place in the following manner: - The
device 240 has threefluid exchange ducts - The
first duct 278 is formed in part in thehead 256 of thesupport 254 and in part in apump cover 279. Thecover 279 is fastened to the first side of thehead 256, i.e. on the side opposite from thecylinder block 248. When thepump 244 is in place in thehead 256, thecover 279 serves to block it inside thehead 256. Theduct 278 connects the delivery chamber 2440 of thepump 244 to anexternal coupling 274 formed on an external surface of thecover 279. - The ducts 276 and 280 (
FIG. 8 ), formed in thesupport 254, enable thedevice 240 to be coupled respectively to theducts FIG. 2 via couplings of thesupport 254 that are not shown. Only the duct 280 (and not the duct 276) appears in the section view ofFIG. 7 . The end of theduct 280 that is on the same side as thedevice 240 opens out in the above-mentionedgroove 275. - Secondly, the end of the duct 276 that is on the same side as the
device 240 is split into two branches. The first branch is connected to theadmission chamber 2441 of thepump 244. The second branch opens out (in a manner not shown) into aninternal space 252 provided between thedistributor 250 and thehead 256, which internal space is circularly symmetrical in shape about the axis A. - The
groove 275 and theinternal space 252 play the same role in thedevice 240 as thegroove 75 and theinternal space 52 in thedevice 40. In particular, thedistributor 250 has first andsecond distribution ducts ducts - As a result, the
motor 242 and thepump 244 operate identically to themotor 42 and to thepump 44. Finally, the output torque of themotor 242 is not delivered, as in the preceding embodiments, via a flange formed on one of the portions of the casing. - In the
device 240, apart 223 forming a pulley is fastened to thecover casing 246A. The outside surface of this part includes aribbed groove 225 adapted to drive a belt. Advantageously, various parts analogous to thepart 223 may be mounted in interchangeable manner on themotor 242, so that themotor 242 and in particular the drive groove of said motor can be adapted easily to match the type of belt (or optionally the type of chain or of some other drive member) that the motor is to drive.
Claims (20)
1. A hydraulic transmission device for a machine, which device comprises:
a hydraulic motor declutchable by dog clutch, having radial pistons, and including a cam that is secured to a casing, and a cylinder block and an internal fluid distributor that are disposed in the casing;
a hydraulic pump including a drive member; and
a plurality of fluid exchange couplings;
in which device the casing and the distributor are mounted to rotate relative to a stationary support about an axis of rotation, whereas the cylinder block is fastened to said support;
wherein the drive member of the pump is constrained to rotate with the casing of the motor, and in that a delivery orifice of the pump is connected to one of said fluid exchange couplings.
2. A device according to claim 1 , wherein the pump and the fluid exchange couplings are situated on the same side of the cylinder block of the motor, relative to the axis of rotation.
3. A device according to claim 1 , wherein, relative to the axis of rotation, the distributor is interposed between the exchange couplings and the cylinder block, and/or between the pump and the cylinder block.
4. A device according to claim 1 , wherein the pump is disposed at least in part inside said support.
5. A device according to claim 1 , including a drive shaft constrained to rotate with the cam and suitable for actuating the pump, which shaft passes through the inside of the cylinder block.
6. A device according to claim 1 , including a drive shaft constrained to rotate with the cam and suitable for actuating the pump, which shaft is fastened to the casing and/or is disposed at least in part inside the support.
7. A device according to claim 5 , wherein a feed passage of the pump, via which passage a fluid feeding the pump passes is formed between the drive shaft and the support.
8. A device according to claim 7 , wherein a feed duct of the pump is formed in the support and connects an internal space of the casing to said feed passage.
9. A device according to claim 8 , including a fluid supply duct making it possible to inject a feed fluid for feeding the pump into said internal space; said internal space being, in addition, connected to said feed passage via a feed duct making it possible to feed the feed passage with fluid; in which device an orifice of the feed duct in the internal space of the casing and an orifice of the supply duct in the internal space are disposed axially on either side of the cylinder block.
10. A device according to claim 1 , wherein at least an admission duct or a delivery duct of the pump and/or at least a feed duct or a discharge duct of the motor passes through the support.
11. A device according to claim 1 , wherein the support is provided with an axial bore formed along the axis of rotation of the motor, and in which the distributor is disposed.
12. A device according to claim 1 , wherein the fluid discharge of the cylinder block takes place into an internal space of the casing.
13. A device according to claim 1 , wherein the support has a portion in the form of an arm through which at least one duct passes and which extends in a direction that is substantially perpendicular to the axis of rotation.
14. A device according to claim 1 , wherein, in order to enable the casing to be coupled to a member to be driven, said casing has a flange, an external groove suitable for receiving a belt, or else a set of teeth for receiving a chain or gearing.
15. A starter system for a machine having a rotary drive member, in particular for an internal combustion engine, which starter system includes a device according to claim 1 and said rotary drive member, the casing being constrained to rotate with said drive member.
16. A starter system for a machine having a rotary drive member, in particular for an internal combustion engine, which starter system includes a device according to claim 1 and said rotary drive member, the casing being constrained to rotate with said drive member.
17. A starter system for a machine having a rotary drive member, in particular for an internal combustion engine, which starter system includes a device according to claim 2 and said rotary drive member, the casing being constrained to rotate with said drive member.
18. A starter system for a machine having a rotary drive member, in particular for an internal combustion engine, which starter system includes a device according to claim 3 and said rotary drive member, the casing being constrained to rotate with said drive member.
19. A starter system for a machine having a rotary drive member, in particular for an internal combustion engine, which starter system includes a device according to claim 4 and said rotary drive member, the casing being constrained to rotate with said drive member.
20. A starter system for a machine having a rotary drive member, in particular for an internal combustion engine, which starter system includes a device according to claim 5 and said rotary drive member, the casing being constrained to rotate with said drive member.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1154634A FR2975731B1 (en) | 2011-05-27 | 2011-05-27 | HYDRAULIC TRANSMISSION DEVICE WHICH CAN CONSTITUTE A COMPACT HYDRAULIC STARTER |
FR1154634 | 2011-05-27 | ||
PCT/FR2012/051130 WO2012164199A2 (en) | 2011-05-27 | 2012-05-22 | Hydraulic transmission device that can form a compact hydraulic starter |
Publications (1)
Publication Number | Publication Date |
---|---|
US20140322044A1 true US20140322044A1 (en) | 2014-10-30 |
Family
ID=46420349
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/122,592 Abandoned US20140322044A1 (en) | 2011-05-27 | 2012-05-22 | Hydraulic transmission device suitable for constituting a compact hydraulic starter motor |
Country Status (5)
Country | Link |
---|---|
US (1) | US20140322044A1 (en) |
EP (1) | EP2715104A2 (en) |
CN (1) | CN103562541B (en) |
FR (1) | FR2975731B1 (en) |
WO (1) | WO2012164199A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH712781A1 (en) * | 2016-07-18 | 2018-01-31 | Liebherr Machines Bulle Sa | Displacer unit and hydraulic start-stop system with such a displacer unit. |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3001774B1 (en) * | 2013-02-04 | 2015-03-13 | Vianney Rabhi | HYDRAULIC PUMP MOTOR WITH FIXED OR VARIABLE CYLINDREE |
CN109869255B (en) * | 2019-03-11 | 2021-02-12 | 江苏大学 | Automobile starter gear pre-meshing system and control method thereof |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2075131A (en) * | 1980-04-14 | 1981-11-11 | Partek Ab | Hydraulic motor |
US20020166532A1 (en) * | 2001-05-11 | 2002-11-14 | Honda Giken Kogyo Kabushiki Kaisha | Starter system for internal combustion engine |
US20110017059A1 (en) * | 2008-01-29 | 2011-01-27 | Jean Heren | hydraulic motor device for assisting the mechanical transmission of a vehicle |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1395901A (en) * | 1971-04-20 | 1975-05-29 | Lucas Industries Ltd | Hydraulic engine starting systems |
FR2710111B1 (en) * | 1993-09-15 | 1995-12-01 | Poclain Hydraulics Sa | Hydraulic motor fitted with a device for selecting its active displacement. |
WO2006055978A1 (en) * | 2004-11-22 | 2006-05-26 | Bosch Rexroth Corporation | Hydro-electric hybrid drive system for motor vehicle |
WO2008100953A1 (en) * | 2007-02-12 | 2008-08-21 | Walker Frank H | Hydraulic machine arrangement |
-
2011
- 2011-05-27 FR FR1154634A patent/FR2975731B1/en active Active
-
2012
- 2012-05-22 WO PCT/FR2012/051130 patent/WO2012164199A2/en active Application Filing
- 2012-05-22 US US14/122,592 patent/US20140322044A1/en not_active Abandoned
- 2012-05-22 CN CN201280025913.8A patent/CN103562541B/en not_active Expired - Fee Related
- 2012-05-22 EP EP12731033.2A patent/EP2715104A2/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2075131A (en) * | 1980-04-14 | 1981-11-11 | Partek Ab | Hydraulic motor |
US4445423A (en) * | 1980-04-14 | 1984-05-01 | Oy Partek Ab | Hydraulic motor |
US20020166532A1 (en) * | 2001-05-11 | 2002-11-14 | Honda Giken Kogyo Kabushiki Kaisha | Starter system for internal combustion engine |
US20110017059A1 (en) * | 2008-01-29 | 2011-01-27 | Jean Heren | hydraulic motor device for assisting the mechanical transmission of a vehicle |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH712781A1 (en) * | 2016-07-18 | 2018-01-31 | Liebherr Machines Bulle Sa | Displacer unit and hydraulic start-stop system with such a displacer unit. |
Also Published As
Publication number | Publication date |
---|---|
CN103562541A (en) | 2014-02-05 |
FR2975731B1 (en) | 2015-12-11 |
FR2975731A1 (en) | 2012-11-30 |
CN103562541B (en) | 2016-10-12 |
WO2012164199A2 (en) | 2012-12-06 |
WO2012164199A3 (en) | 2013-03-21 |
EP2715104A2 (en) | 2014-04-09 |
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AS | Assignment |
Owner name: POCLAIN HYDRAULICS INDUSTRIE, FRANCE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HEREN, JEAN;D'HERSIGNERIE, CYRILLE;DAVID, SEBASTIEN;AND OTHERS;SIGNING DATES FROM 20140430 TO 20140513;REEL/FRAME:032923/0918 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |