JP6566605B2 - Inscribed gear pump for hydraulic vehicle brake system - Google Patents

Description

  The present invention relates to an internal gear pump having the features of the preamble of claim 1. Such inscribed gear pumps are used in skid-controlled and / or powered vehicle brake devices in place of commonly used piston pumps and are not always suitable, but are often also referred to as return pumps. Yes.

  Inscribed gear pumps are known. Known internal gear pumps have a pinion, i.e. a gear with external teeth, which is arranged eccentrically in a ring gear with internal teeth, at one point in the circumferential direction or It meshes with the ring gear in one circumferential section. The pinion and ring gear are also interpreted as the gears of the inscribed gear pump. One of the two gears, typically the pinion, is driven to rotate, so that the other gear, typically the ring gear, is driven to rotate, and the inscribed gear pump is in a known manner with a fluid or In a hydraulic vehicle brake device, brake fluid is pumped.

  Outside the circumferential section where the pinion meshes with the ring gear, the inscribed gear pump has a crescent-shaped free space between the pinion and the ring gear, which is referred to herein as the pump space. Is done. A separation member is disposed in the pump space, and the separation member separates the pump space into a discharge chamber and a suction chamber. Based on its typical shape, the separating member is also referred to as a crescent or crescent member, or alternatively as a filling member. The inside of the separating member, typically a hollow circle, abuts the tooth tip of the pinion dentition and the outside of the separating member, typically curved outward, is the ring gear dentition. Therefore, the separating member confines the fluid volume in the interdental space between the teeth of the inscribed gear pump. The gear is rotationally driven to pump the fluid in the interdental space from the suction chamber to the discharge chamber.

  Patent Document 1 discloses an internal gear pump of this type, and the separation member of the internal gear pump is composed of a plurality of parts, and has an inner part and an outer part. The inner side of the inner portion abuts on the tooth tip of the pinion tooth row, and the outer side of the outer portion abuts on the tooth tip of the ring gear tooth row. The inner part and the outer part of the separation member of the known inscribed gear pump are supported by pins in the circumferential direction against the pressure in the discharge chamber, and this pin forms a support part. The pin forming the support part is disposed at the end of the separation member on the discharge chamber side, and penetrates the pump space in the lateral direction or in parallel with the axis. A torsion spring disposed between the inner part and the outer part of the separating member presses the inner part and the outer part away from each other, thereby pressing the inner part toward the tooth tip of the pinion dentition; The outer part is pressed toward the tooth tip of the ring gear dentition.

German Federal Republic of Patent Publication No. 102009047643

  The inscribed gear pump according to the present invention having the features of claim 1 comprises a plurality of parts, including an inner part that abuts against the tooth tips of the pinion tooth row and an outer part that abuts against the tooth tips of the ring gear tooth row. It has a separating member. The inner part and the outer part of the separating member are movable in the radial direction. The “radial direction” relates to the inscribed gear pump as well as the name “circumferential direction” used in the following, and also relates to a predetermined installation position of the component. The direction of rotation is the planned direction of rotation of the pinion and ring gear. Due to the movability of the inner part and the outer part, the inner part and the outer part can be brought into contact with each other in advance in the radial direction of the inscribed gear pump at the tooth tips of the gear teeth of the inscribed gear pump.

  The spring member loads the inner part inwardly toward the tooth tip of the pinion dentition and the outer part outwardly toward the tooth tip of the ring gear dentition. Preferably, the spring member is arranged between the inner part and the outer part and presses the inner part and the outer part away from each other, so that the inner part is directed towards the tooth tips of the pinion dentition. Pressing inward and pressing the outer part outward toward the tooth tip of the tooth row of the ring gear. The spring member is particularly necessary when the inscribed gear pump is free of pressure, i.e. when the inscribed gear pump is stopped or for pump operation. In the internal gear pump during the rotational movement and the pumping movement, the intermediate chamber between the inner part and the outer part of the separating member is loaded by the discharge pressure of the internal gear pump. The parts can be pressed away from each other and pressed against the tooth tips of the pinion and ring gear teeth.

  In accordance with the present invention, an inscribed structure corresponding to a general discharge pressure of an inscribed gear pump against an interlocking movement by a pinion that rotates during operation of the inscribed gear pump and a ring gear that rotates with the pinion. The spring member holds the separating member in the circumferential direction of the inscribed gear pump against the pressure filled in the discharge chamber of the mold gear pump. The pressure in the discharge chamber loads the separating member against the rotational direction of the pinion and ring gear.

  The dependent claims contain preferred embodiments and variants of the invention described in claim 1.

  According to the second aspect, the spring member of the separating member has a holder protruding sideways. The holder may be provided on one side or on both sides. The holder is, for example, associated with a hole or notch provided in the end wall of the pump housing, or a hole or notch provided in an axial disk that covers the side of the pump space at least in the region of the separation member and the discharge chamber. Thereby holding the separating member in the inscribed gear pump. The axial disk of the internal gear pump is also called a pressure disk, a control disk, or a control plate. The shape of the holder may be arbitrary, for example, the shape of a tongue piece, a pin, or a protrusion.

  According to the third aspect of the present invention, the inscribed gear pump has a leaf spring as a spring member, and the holder protrudes laterally from the leaf spring. It engages in a hole, a notch or the like provided in the face wall or the axial disk, and in this manner, the separating member is held in the inscribed gear pump. A holder may be provided on one side or both sides of the leaf spring. The leaf spring may be, for example, a U-shaped torsion spring having legs that are curved in the circumferential direction of the inscribed gear pump in a suitable manner. The leaf spring including the holder protruding to the side can be easily and inexpensively manufactured by stamping from a thin metal plate. The leaf spring is arranged in particular between the inner part and the outer part of the separating member and presses the inner part and the outer part away from each other, so that the inner part is directed towards the tooth tip of the pinion dentition. The inner part and the outer part are pressed outward toward the tooth tip of the ring gear tooth row.

  According to the fourth aspect of the present invention, the inscribed gear pump has a support portion, and in this support portion, the separating member is supported in the circumferential direction of the inscribed gear pump against the pressure filled in the discharge chamber. ing. In this case, the holder of the spring member only needs to hold the separating member against only the interlocking movement by the pinion and the ring gear that rotate during operation of the inscribed gear pump. According to claim 5, the separating member is supported by the spring member. According to claim 6, the outer part is supported by the spring member and the inner part is supported by the outer part or, conversely, the inner part is supported by the spring member and the outer part is supported by the inner part. Yes.

  The inscribed gear pump according to the invention is in particular provided as a hydraulic pump for hydraulic, skid-controlled and / or powered vehicle brake devices. The hydraulic pump in the skid control type vehicle brake device is also called a return pump, and is generally configured as a piston pump today.

  The present invention will be described in detail below with reference to embodiments shown in the drawings.

1 is an end view of an inscribed gear pump according to the present invention. It is the expanded perspective view which shows the detail of the area | region of the separation member of the internal gear pump shown in FIG.

  The inscribed gear pump 1 according to the invention shown in the figure is shown without a pump housing. This internal gear pump 1 has a gear with external teeth, referred to herein as a pinion 2, and a gear with internal teeth, referred to herein as a ring gear 3. The pinion 2 is arranged in an axially parallel and eccentric manner in the ring gear 3 so that the pinion 2 meshes with the ring gear 3. The pinion 2 is disposed so as not to rotate relative to the pump shaft 4, the pinion 2 can be driven to rotate together with the pump shaft, and the ring gear 3 meshing with the pinion 2 can be driven to rotate via the pinion 2. . The direction of rotation is indicated by arrow P. The ring gear 3 is press-fitted into the bearing ring 5, and the bearing ring 5 is rotatably slidably supported in a pump housing (not shown).

  Outside the circumferential section where the pinion 2 meshes with the ring gear 3, the inscribed gear pump 1 has a crescent-shaped free space between the pinion 2 and the ring gear 3. This is called pump space 6. In the pump space 6, a separation member 7 having a plurality of parts having a crescent shape or a half crescent shape is also arranged. The separation member 7 divides the pump space 6 into a suction chamber 8 and a discharge chamber 9. It is separated. The suction chamber 8 communicates with the pump inlet, the discharge chamber 9 communicates with the pump outlet, and the pump inlet and the pump outlet open into the suction chamber 8 or the discharge chamber 9 of the pump space 6 from one side. ing. Since the pump inlet and the pump outlet are located in front of the projection plane, they cannot be seen in the drawing.

  The separating member 7 comprising a plurality of parts has an arched inner part 10 and an arched outer part 11 as well. The inner side of the concave cylindrical shape of the inner portion 10 is in contact with the tooth tip of the tooth row of the pinion 2, and the outer side of the convex cylindrical shape of the outer portion 11 is in contact with the tooth tip of the tooth row of the ring gear 3. ing. An interdental space between the tooth row of the pinion 2 and the tooth row of the ring gear 3 by the inner portion 10 and the outer portion 11 of the separating member 7 being in contact with the tooth tips of the tooth row of the pinion 2 and the ring gear 3. The fluid is confined therein, and therefore, the fluid is pumped from the suction chamber 8 to the discharge chamber 9 when the pinion 2 and the ring gear 3 are driven to rotate. When the internal gear pump 1 is used as a hydraulic pump of a hydraulic vehicle brake device, the fluid to be pumped is brake fluid.

  The separation member 7 is supported by the support portion 12 against the discharge pressure in the discharge chamber 9. In the illustrated embodiment of the present invention, the support 12 is a pin that penetrates across the pump space 6 at the end of the separating member 7 on the suction chamber side. In order to bring the separation member 7 into good contact, the pin forming the support portion 12 has a flat portion for making contact with the end of the separation member 7 on the suction chamber side.

  A spring member configured as a leaf spring 13 is arranged in the gap between the inner part 10 and the outer part 11 of the separating member 7. The leaf spring 13 is flat in an unstrained state, but is elastically arched by being placed in an arched gap between the arched inner portion 10 and the arched outer portion 11. I am nervous. In general, the leaf spring 13, which can be interpreted as a spring member of the separating member 7 composed of a plurality of parts, presses the inner part 10 and the outer part 11 away from each other, that is, the inner part 10 is pressed against the teeth of the pinion. The inner portion 11 is pressed inward toward the teeth of the row, and the outer portion 11 is pressed outward toward the tips of the teeth of the ring gear 3. The leaf spring 13 is configured so that the inner portion 10 and the outer portion 11 are in contact with the tooth tips of the teeth of the pinion 2 and the ring gear 3 when the inscribed gear pump 1 is not pressurized, that is, in a stopped state or operating state. Acts to touch.

  Since the gap between the inner portion 10 and the outer portion 11 of the separating member 7 is open at the end on the discharge chamber side, the end on the discharge chamber side of this gap is connected to the discharge chamber 9 of the internal gear pump 1. Communicate. The gap between the inner portion 10 and the outer portion 11 is filled with the same pressure as that in the discharge chamber 9, that is, the discharge pressure of the internal gear pump 1. During operation of the internal gear pump 1, the discharge pressure applies the inner part 10 inwardly toward the tooth tips of the teeth of the pinion 2, and the outer part 11 outwards toward the teeth of the teeth of the ring gear 3. To load.

  In the vicinity of the end on the suction chamber side, the inner part 10 and the outer part 11 are arranged between the inner part 10 and the outer part 11 in the gap in order to seal the discharge chamber 9 against the suction chamber 8. The elastic seal members 14 are sealed together.

  A leaf spring 13 forming a spring member that presses the inner portion 10 and the outer portion 11 of the separating member 7 in a direction away from each other and toward the tooth tips of the teeth of the pinion 2 and the ring gear 3 is a longer side surface thereof. 2 has a holder 15 protruding laterally (FIG. 2; FIG. 2 does not show the inner part 10 of the separating member 7, because the inner part 10 hides the leaf spring 13 with the holder 15. Because it ends up.) In the illustrated embodiment, the holder 15 is square when viewed in plan view, but the present invention is not limited to this shape. The holder 15 protrudes laterally beyond the inner portion 10 and the outer portion 12 of the separating member 7 and engages in a hole 16 provided in the axial disk 17. The axial disk 17 is connected to the pinion 2. The ring gear 3 and the separating member 7 are disposed on one side, and cover the side of the pump space 6 at least in the region of the discharge chamber 9 and the separating member 7. The axial disk 17 is movable in the axial direction, but is held unmovable by the support portion 12. The fact that the holder 15 is engaged in the hole 16 provided in the axial disk 17 is shown in the enlarged perspective view of FIG. The axial disk 17 is pressurized on the outer side opposite to the pinion 2, the ring gear 3, and the separating member 7, and is thereby pressed against the pinion 2, the ring gear 3 and the separating member 7. The leaf spring 13 is held in the inscribed gear pump 1 by engaging the holder 15 of the leaf spring 13 protruding sideways into the hole 16 of the axial disk 17 that cannot rotate. The holder 15 is stamped and formed from a thin metal plate together with the leaf spring 13 in one operation stage.

  The outer portion 11 of the separating member 7 has a protrusion protruding inward, and this protrusion forms a stopper 18 for the end of the leaf spring 13 on the suction chamber side. With this stopper 18, the outer portion 11 of the separating member 7 is supported by the leaf spring 13 in the direction opposite to the rotational direction P against the interlocking movement of the ring gear 3. The inner part 10 is supported by the outer part 11. In the reverse rotation direction of the inscribed gear pump 1, the inner portion 10 of the separation member 7 is bent at a bent portion 19 protruding outward, so that the leaf spring 13 is opposed to the pressure in the discharge chamber 9 against the pressure in the discharge chamber 9. Is supported by the other end of the. Of course, it is not necessary to support the separating member 7 against the pressure in the discharge chamber 9. This is because the separating member 7 is supported by the support portion 12 against the pressure in the discharge chamber 9. The leaf spring 13 holds the separating member 7 by a holder 15 that engages in the hole 16 of the axial disk 17. When the axial disk 17 is not provided, the holder 15 of the leaf spring 13 is engaged with a hole or the like provided in an end wall of the pump housing (not shown) that partitions the side of the pump space 6 instead of the axial disk 17. May be combined.

  In the illustrated embodiment, the leaf spring 13 has a holder 15 on one side. Holders 15 may be provided on both sides of the leaf spring 13 (not shown).

  The inscribed gear pump 1 according to the present invention is provided as a hydraulic pump of a hydraulic, skid control and / or powered vehicle brake device (not shown). In this case, the inscribed gear pump 1 is anti-static. Used for skid control such as lock control, traction slip control and / or beagle dynamic control and / or used for brake pressure generation in hydraulic powered vehicle brake devices. Such a hydraulic pump is not necessarily suitable, but is also called a return pump. The abbreviations ABS, ASR, FDR and ESP are commonly used for the skid control. Beagle dynamic control is also slang termed as an overspeed prevention control device.

DESCRIPTION OF SYMBOLS 1 Internal gear pump 2 Pinion 3 Ring gear 4 Pump shaft 5 Bearing ring 6 Pump space 7 Separation member 8 Suction chamber 9 Discharge chamber 10 Inner part 11 Outer part 12 Support part 13 Leaf spring 14 Seal member 15 Holder 16 Hole 17 Axial disk 19 Bending part

Claims (6)

An internal gear pump for a hydraulic vehicle brake device, which has a ring gear (3) with internal teeth and a pinion (2) with external teeth, the pinion (2) The circumferentially arranged in the ring gear (3) is thereby meshed with the ring gear (3) in a circumferential section, and the ring gear (3) and the pinion (2) mesh with each other. Outside a section of direction, a crescent-shaped pump space (6) is formed between the ring gear (3) and the pinion (2), and a separation comprising a plurality of parts in the pump space (6) A member (7) is disposed, the separation member (7) separates the pump space (6) into a suction chamber (8) and a discharge chamber (9), and the separation member (7) The inner part (10) and the outer part (11) The inner part (10) and the outer part (11) are movable relative to each other in the radial direction, the inner part (10) abutting against the tooth tip of the dentition of the pinion (2), The outer portion (11) comes into contact with the tooth tip of the tooth row of the ring gear (3), the separation member (7) has a spring member (13), and the spring member (13 ) Load the inner portion (10) and the outer portion (11) away from each other, that is, the inner portion (10) inwardly toward the tooth tip of the dentition of the pinion (2). In the type in which the outer portion (11) is loaded outwardly toward the tooth tip of the tooth row of the ring gear (3),
The spring member (13) holds the separating member (7) in the circumferential direction of the inscribed gear pump (1),
The outer part (11) of the separating member (7) has a protrusion (18) that forms a stopper for the end of the spring member (13) on the suction chamber (8) side and protrudes inward. Supported by the spring member (13) via the protrusion (18),
An internal gear pump for a hydraulic vehicle brake device, comprising an elastic seal member (14) between the inner portion (10) and the outer portion (11). The spring member (13) has a holder (15) protruding laterally beyond the separating member (7), and the holder (15) causes the separating member (7) to be connected to the internal gear pump ( The internal gear pump according to claim 1, wherein the internal gear pump is held in 1). The internal gear pump according to claim 2, wherein the spring member (13) is a leaf spring, and the leaf spring has a holder (15) protruding sideways. In the circumferential direction of the inscribed gear pump (1), the separating member (7) resists the pressure filled in the discharge chamber (9), and supports (12) of the inscribed gear pump (1). The internal gear pump according to claim 1, wherein the internal gear pump is supported. The outer part (11) of the separating member (7)
The inscribed gear pump according to claim 1, wherein the inscribed gear pump is supported by the spring member in a circumferential direction of the inscribed gear pump. The inscribed gear pump according to claim 5, wherein the inner part (10) is held by the outer part (11).

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