JP6297277B2 - Internal gear pump - Google Patents

Description

  The present invention relates to an internal gear pump having the structure described in the preamble of claim 1.

  Internal gear pumps are known. The internal gear pump has an internal gear, that is, an internal gear, and an external gear that is arranged eccentrically in the internal gear and is hereinafter referred to as a pinion. The internal gear, which can be called a gear of the internal gear pump, and the pinion mesh with each other at the peripheral portion. The internal gear and the pinion define a crescent-shaped pump chamber between the internal gear and the pinion in the other peripheral portion where the two gears of the internal gear pump do not mesh with each other. The pump chamber is also called a discharge space, a free space or an intermediate space. A separation member is disposed in the pump chamber, and the separation member is usually adapted to the shape of the pump chamber, so that it is also called a sickle member or a crescent member. Another name for the separating member is a filling member. The separating member separates the suction area of the pump chamber from the pressurization area. In this case, the suction area communicates with the pump suction section, the pressurization area communicates with the pump discharge section, and the internal pump suction section or discharge section (one of Part).

  The tooth heads of the internal gear and pinion teeth abut against the inside or outside of the separating member and slide along the outside and inside of the separating member when the internal gear pump is operated, i.e., when the pinion and the internal gear are driven to rotate. . The separating member seals the amount of fluid in the intermediate space between the internal gear and the pinion, so that when rotating, i.e. when the internal gear pump is operating, the gear removes fluid from the suction area of the pump chamber of the internal gear pump. Transport to pressure area.

  While the internal gear pump produces pressure pulsation during liquid transport, pressure pulsation is undesirable and generates operating noise and increases mechanical load. The pressure pulsation occurs when the internal gear and the pinion tooth groove are open to the pressurizing region at the pressurizing region side end of the separating member. The pressure in the open tooth intermediate space rises rapidly, and as a result, the pressure in the pressurization region drops somewhat. For this reason, it is known to provide a plurality of so-called pilot notches. These pilot notches extend one by one along the side of the separating member from the pressure region of the internal gear pump in the region between the pinion and the tip circle and the root circle of the internal gear, extending in the direction of the suction region. Exists. The cross-section of the pilot notch is small enough to act as a restriction, and the liquid flow flowing from the pressurized region through the pilot notch into the tooth intermediate space causes the tooth intermediate space to move along the separating member when the internal gear pump is operated. When moving to the pressurization area, the pressure in the tooth intermediate space is increased, ideally, the pressure in the pressurization area is increased. As a result, even if the tooth intermediate space opens at the end of the separating member, the pressurization area There is no pressure change inside (the pilot notch does not reach the suction area). Typically, the cross section of the pilot notch decreases from the pressurization region toward the suction region in a direction opposite to the rotational direction of the gear of the internal gear pump. Typically, the pilot notch is provided in a so-called axial disk, which is also called a control plate or a pressure plate, abuts against the end surfaces of the gear and the separating member, and includes a pump chamber and a tooth intermediate space of the gear. Is sealed from the side. Patent Document 1 discloses such a pilot notch, but there is no description thereof.

  Patent Document 2 discloses an alternative configuration, that is, pilot notches are formed on the inner peripheral surface and the outer peripheral surface of the separating member, and the gear teeth of the internal gear pump are formed on these peripheral surfaces. Abut and slide during operation.

German patent 1961833B4 specification German Patent Application Publication No. 102010064193A1

  An object of the present invention is to improve a conventional internal gear pump.

  The separation member of the internal gear pump according to the present invention having the configuration of claim 1 includes an inner portion and an outer portion, and an inner surface of the inner portion abuts a tooth head of a pinion tooth, and an outer surface of the outer portion. The tooth heads of the teeth of the internal gear are in contact. There is an intermediate space between the inner part and the outer part of the separating member, which communicates with the pressurizing region of the pump chamber of the internal gear pump, i.e. inside the separating member of the internal gear pump according to the invention. In the intermediate space between the part and the outer part, the same pressure as that in the pressure region of the internal gear pump dominates. The separating member may be composed of a plurality of parts, and the inner part may be pivotally connected to the outer part. The separating member may be integral, for example in the shape of a “U” curved towards one side, one leg forming the inner part and the other leg forming the outer part, these legs The parts are joined together by a “U” yoke. It does not exclude other configurations of the separating member.

  According to the invention, the inner part and / or the outer part of the separating member have at least one penetration, the penetration being in the radial direction or at an angle to the radial direction, and the inner part and / or Through the outer part, the tooth intermediate space of the pinion and / or internal gear is joined with the intermediate space between the inner part and the outer part of the separating member. The penetrating part is always located between the inner part and the outer part when the tooth intermediate space of the pinion and / or internal gear is in the region of the opening of the penetrating part, i.e. in communication with the penetrating part. Combine with the intermediate space. Since the intermediate space between the inner part and the outer part of the separating member communicates with the pressurization region of the pump chamber of the internal gear pump, the intermediate space between the inner part and the outer part of the separating member includes The same pressure as the pressure in the pressurizing region dominates. Each tooth intermediate space is subjected to pressure action through the penetrating portion, and in this case, the cross section of the penetrating portion suppresses the generation of pressure in the tooth intermediate space, and as a result, the pressure in the tooth intermediate space is reduced in the pressurizing region. It is so small that it does not rise rapidly to the pressure.

  The present invention replaces the pilot notch, but does not exclude the pilot notch.

  The advantages of the present invention are that it is cumbersome to manufacture because it extends in the circumferential direction and the cross section changes in the length direction, the squeezing action is inaccurate, and it depends relatively strongly on the temperature of the liquid. One or more through portions can be more easily formed in the separating member than a pilot notch. Furthermore, the cross-section of the pilot notch is reduced by wear, but this is not the case for one or more penetrations provided in the separating member. Another advantage of the present invention is that it is less necessary to accurately set the position of the one or more penetrations in the separating member when viewed in the circumferential direction of the internal gear pump and extends in the circumferential direction. In the case of a pilot notch, the circumferential position is very important for the function.

  The dependent claims are directed to advantageous configurations and other configurations of the invention as defined in claim 1.

  The penetration part of the separation member may be a groove provided in the separation member so as to open at the end face of the separation member. Preferably, according to claim 2, the through portion is a through hole, that is, closed on the circumferential side.

  According to a preferred configuration of the present invention as set forth in claim 3, a plurality of through portions are provided in the inner portion and / or the outer portion of the separating member, and these through portions are arranged in series with each other in the circumferential direction of the internal gear pump. Has been placed. Thus, if the throttling action of the penetrating portion is appropriate, pressure is generated stepwise in the intermediate tooth space when the intermediate tooth space of the pinion and / or the internal gear moves along the separating member during operation. be able to. The pressure in one tooth intermediate space always rises when the tooth intermediate space is at the opening of one penetration, in which case the pressure is throttled, i.e. slow and does not rise rapidly.

  Unlike pilot notches that act like a throttle that is hydraulically connected to each other in series with the teeth of the pinion or internal gear, the through-portions arranged in series with each other in accordance with the present invention are parallel to each other. It acts like a throttle connected hydraulically to the pressure side, and the pressure prevailing in the pressure region of the internal gear pump always dominates the pressure side.

  According to another configuration of the present invention as set forth in claim 4, the cross-sections of the through portions arranged in series with each other in the circumferential direction are increased from the suction region to the pressure region, that is, closer to the suction region. The penetrating part at is located more strongly than the penetrating part at a position closer to the pressurizing region. In this way, the pressure in the tooth intermediate space can be increased almost continuously from the suction area toward the pressure area to the dominant pressure in the pressure area.

  The internal gear pump according to the present invention is particularly provided as a hydropump of a hydraulic vehicle brake device, a slip control type vehicle brake device, and / or a vehicle power brake device. In a slip-controlled vehicle brake device, the hydro pump is also called a reverse pump, and is today mainly implemented as a piston pump.

  Next, the present invention will be described in detail using embodiments shown in the drawings.

It is the side view which showed the internal gear pump by this invention, omitting the pump case. It is a longitudinal cross-sectional view of the separation member of the internal gear pump of FIG.

  The internal gear pump 1 according to the invention shown in FIG. 1 has two gears 2, 3, ie an internal gear 2 and an external gear, here called a pinion 3. The pinion 3 is eccentrically arranged in the internal gear 2, and the gears 2 and 3 have axes parallel to each other and mesh with each other. The internal gear 2 is rotatably supported in the support ring 4, and the pinion 3 is disposed on the pump shaft 5 so as not to be relatively rotatable. In order to operate the internal gear pump 1, the pump shaft 5 is driven to rotate, and the relatively non-rotatable pinion 3 on the pump shaft 5 rotates together with the pump shaft to rotate the meshed internal gear 2. To drive. The direction of rotation is indicated by the arrow P.

  The gears 2 and 3 define a crescent-shaped pump chamber 6 between the gears in a peripheral portion where they are engaged with each other. A crescent-shaped separation member 7 is disposed in the pump chamber 6, and the separation member can be regarded as a partial crescent shape or a half crescent shape, and is often referred to as a sickle-like member or a sickle body because of its shape. The separating member 7 separates the suction region 8 of the pump chamber 6 from the pressurizing region 9. A suction hole 10 opens in the suction region 8, and a discharge hole 11 protrudes from the pressure region 9. The tooth heads of the gears 2 and 3 of the internal gear pump 1 abut against the outer surface or inner surface of the separating member 7 and slide along the outer surface or inner surface of the separating member 7 when the gears 2 and 3 are driven to rotate. The separating member 7 has the same width as the gears 2 and 3, both of which have the same width. The separating member 7 seals the amount of liquid in the tooth intermediate space of the gears 2 and 3, and as a result, the liquid is conveyed from the suction area 8 to the pressure area 9 by the rotational drive of the gears 2 and 3. When the teeth of the gears 2 and 3 mesh with each other again at the end of the pump chamber 6, the teeth of one gear 2 and 3 discharge the liquid from the tooth intermediate space of the other gear 3 and 2. The separating member 7 is supported by a pin at the end on the suction region side, and the pin penetrates the pump chamber 6 in the lateral direction as a support (12) for the separating member 7.

  The separating member 7 includes a plurality of portions, and includes an inner portion 13, an outer portion 14, a packing 15, and a leg spring 16 as an elastic element. The inner portion 13 and the outer portion 14 have an arc shape, the inner portion 13 has a cylindrical inner surface, the outer portion 14 has a cylindrical outer surface, and the teeth of the pinion 3 and the internal gear 2 are formed on the inner surface and the outer surface. The tooth head contacts and slides when the internal gear pump 1 is operated. There is an intermediate space 17 between the inner portion 13 and the outer portion 14. The inner portion 13 and the outer portion 14 are pivotally coupled to each other at the suction region side end where the separating member 7 is in contact with the pin forming the abutment 12, and the abutment 12 is abutted by the lateral pin 18. Connection is secured. The separating member 7 is open at the end of the pressurizing region, that is, the intermediate space 17 between the inner portion 13 and the outer portion 14 communicates with the pressurizing region 9 of the pump chamber 6 of the internal gear pump 1. Yes. In the intermediate space 17, the same pressure as in the pressurizing region 9 dominates, and this pressure separates the inner portion 13 and the outer portion 14 from each other, and against the tooth heads of the teeth of the pinion 3 and the internal gear 2. Press. A leg spring 16 is arranged between the inner part 13 and the outer part 14, which pulls the inner part 13 and the outer part 14 apart from each other irrespective of the action of pressure in the intermediate space 17, The pinion 3 and the internal gear 2 are pressed against the teeth. The packing 15 is arranged at the suction region side end portion in the intermediate space 17 between the inner portion 13 and the outer portion 14, and performs sealing there.

  The inner portion 13 and the outer portion 14 have a plurality of through portions 19, and these through portions are implemented as cylindrical through holes in this embodiment (FIG. 2). The penetrating portion 19 penetrates the inner portion 13 and the outer portion 14 in a substantially radial direction, and communicates the intermediate space 17 with the tooth intermediate space between the teeth of the pinion 3 and the internal gear 2. The penetrating portion 19 is arranged in series in the circumferential direction with the inner portion 13 and the outer portion 14, and the cross section or diameter of the penetrating portion 19 increases from the suction region 8 toward the pressurizing region 9. The penetrating part 19 forms a constricted part, and the constricting action is synchronized with the cross section and diameter that increase from the suction region to the pressurizing region. During operation of the internal gear pump 1, the liquid, in this embodiment, the brake fluid is between the inner portion 13 and the outer portion 14 of the separating member 7 and communicates with the pressurizing region 9, and thus in the pressurizing region 9. From the intermediate space 17 that is controlled by the same pressure as the pressure, the intermediate space between the teeth of the pinion 3 and the internal gear 2 passes through the through portion 19, and the opening of one through portion of the plurality of through portions 19 When in the part, it flows into this tooth intermediate space. As a result, the pressure in the tooth intermediate space increases, and when the internal gear pump 1 is operated, when one tooth intermediate space is at the opening of one of the plurality of through portions 19. It always moves along the inner part 13 and the outer part 14. Due to the squeezing action of the penetrating portion 19, the pressure in the tooth intermediate space does not increase rapidly but is suppressed and increases. The penetrating portion 19 does not increase the pressure in the tooth intermediate space to the dominant pressure in the intermediate space 17 in the same manner as the first penetrating portion 19, and the penetrating portion 19 (for example, the last penetrating portion or The width and thus the size of the squeezing action are selected so that the pressure rises to the pressure only at the penultimate penetrating part 19). The first penetrating part 19 is the penetrating part 19 closest to the suction area 8, and the last penetrating part 19 is the penetrating part 19 closest to the pressurizing area 9. Accordingly, the pressure in the tooth intermediate space of the teeth of the pinion 3 and the internal gear 2 is applied by the intermediate tooth space from the suction area along the inner portion 13 and the outer portion 14 of the separating member 7 during the operation of the internal gear pump 1. While moving to the pressure region, the suction pressure or pre-pressure dominant in the suction region rises to the discharge pressure of the internal gear pump 1 dominant in the pressurization region 9. Sudden pressure changes at the pump discharge, and thus pressure pulsations, are avoided, which also avoids operating noise and reduces the mechanical load on the internal gear pump 1. The leg spring 16 has a hole 20 as a penetrating portion where the penetrating portion 19 of the inner portion 13 and the outer portion 14 of the separating member 7 is provided, and allows the brake fluid to flow therethrough.

  The internal gear pump 1 is provided as a hydro pump of a hydraulic vehicle brake device, a slip control type vehicle brake device, and / or a vehicle power brake device (not shown), and includes brake lock protection control, traction slip control and / or dynamic. Used for slip control, such as drive control, and / or for generating brake pressure in a vehicle hydraulic power brake system. Such a hydro pump is not necessarily an accurate expression, but is also called a reverse pump. Abbreviations such as ABS, ASR, FDR, and ESP are used for the slip control, and the dynamic drive control is generally called stability control.

DESCRIPTION OF SYMBOLS 1 Internal gear pump 2 Internal gear 3 Pinion 6 Pump chamber 7 Separation member 8 Suction area 9 Pressurization area 13 Inner part of separation member 14 Outer part of separation member 17 Intermediate space 19 Through part

Claims (4)

An internal gear (2) and a pinion (3) are provided, the internal gear and the pinion mesh with each other at the peripheral portion, and the pump chamber (6) is defined between the internal gear and the pinion at the other peripheral portion. And a separating member (7) separating the suction region (8) of the pump chamber (6) from the pressurizing region (9) of the pump chamber (6) is disposed in the pump chamber, The separating member (7) has an inner part (13) and an outer part (14), the tooth heads of the teeth of the pinion (3) are in contact with the inner surface of the inner part, and the inner surface is on the outer surface of the outer part. The tooth head of the tooth of the gear (2) abuts, and the intermediate space (17) between the inner part (13) and the outer part (14) is the pressurizing area (9) of the pump chamber (6). An internal gear pump (1) in communication with said inner part (13) and / or said outer A portion (14) communicates the intermediate space (17) between the inner portion (13) and the outer portion (14) with the tooth intermediate space of the pinion (3) and / or the internal gear (2). The penetration portion (19) having a plurality of penetration portions (19) that are close to the pressurizing region (9) is located closer to the suction region (8). An internal gear pump characterized by having a larger cross section than   The internal gear pump according to claim 1, characterized in that the through part (19) is a through hole closed on the circumferential side. Said through portion (19), characterized in that it is arranged in series with each other in the circumferential direction, the internal gear pump according to claim 1.   2. Internal gear pump according to claim 1, characterized in that the internal gear pump (1) is a hydropump of a hydraulic vehicle brake device.

Images