KR100995488B1 - Reciprocating pump for delivering fluids - Google Patents

Abstract

The invention relates to a reciprocating pump for delivering fluids, which comprises at least one piston element (2) which is mobile inside a cylinder (10), and a drive (9) driving a driving shaft (5). The pump is characterized in that the driving shaft (5) is provided with a worm gear (6) which drives a toothed wheel (4) and the piston element (2) is fastened on the toothed wheel (4) by means of a crank drive (3).

Description

Piston Pumps for Fluid Delivery {RECIPROCATING PUMP FOR DELIVERING FLUIDS}

FIELD OF THE INVENTION The present invention relates to a piston pump for fluid delivery, and more particularly, to a piston pump for delivering air, which serves to inflate or expand the seat cushion with air in a vehicle seat system or to discharge air from the seat cushion to shrink the seat cushion. It is about.

The invention also relates to a seat system comprising an integrated piston pump.

Actuating machines for fluid delivery are known in different forms in the prior art. For example, piston pumps, vane pumps, screw compressors, Roots compressors and the like are used. Known actuating machines have the disadvantage that they are loud during operation, especially when the actuating machines are operated at high speed to ensure a certain delivery flow. Also recently, seat cushions that are inflatable and retractable in the seat of the vehicle to provide a massage function to a person sitting on the seat or to inflate or retract the seat cushion area, for example, in response to lateral acceleration acting on the vehicle during curve driving. The use of increased. In particular, rapid inflation or deflation of the seat cushion is essential to inflate or deflate the seat cushion to improve lateral support of the person sitting on the seat during the curve run. In this case, if the known operating machines used for the seats are operated at high speeds, they cause undesirable noise during operation. Since the space ratio in the vehicle seat is relatively small, the actuating machines of the above manner must also be designed as small as possible, so that the actuating machines can deliver only a relatively small volume per stroke or revolution. In order to achieve high volumetric flow, the working machines must be operated at higher speeds, so the noise problem becomes more serious.

On the contrary, the piston pump for fluid delivery according to the present invention comprising the features of claim 1 has the advantage that the piston pump is designed very compactly and in particular can deliver fluids with less noise. This is made possible according to the invention by the piston member being movable by the crank drive device, the crank drive device being fixed to the gear and the gear being driven by the drive device. Thereby, the piston pump according to the invention can be used in particular in the seat of a vehicle, since the piston pump is designed small and operates without noise even at high speeds.

The dependent claims present preferred embodiments of the invention.

Preferably, the gear device is arranged between the output shaft and the gear on which the crank drive device is arranged so as to increase or decrease the output speed of the drive device. The gear device is particularly preferably formed as a separate idler gear, which is arranged between the output shaft containing the worm and the gear of the crank drive device. Preferably the idler gear comprises a worm gear region and a spur gear region. The worm gear region and the spur gear region are arranged to contact each other on the outer periphery.

In order to increase the delivery flow, it is preferred that a plurality of piston members are preferably provided arranged in line. By arranging the piston members in line, the piston pump according to the invention can be designed particularly flat, since the thickness of the piston pump depends only on the diameter of the piston or the diameter of the cylinder. The crank drive according to the invention of the piston members does not increase the required assembly space, unlike known crankshafts, because the crank drive according to the invention is fixed to the gear.

In order to design a particularly compact structure, the first gear of the first piston member preferably drives the second gear of the adjacent second piston member. If there are more than two piston members, preferably the gear of the second piston member drives the adjacent gear of the third piston member.

In order to provide an actuating piston pump which operates in particular with a compact, sufficiently large delivery flows, preferably four piston members are arranged, and the crank drive of the piston members is arranged in the gears in a 90 ° offset position, respectively. .

In addition, the valves of the piston pump are arranged in the cover region of the cylinder. This increases the usable delivery volume in addition to its compact structure.

Preferably the drive of the piston pump is an electric motor.

The invention also relates to a vehicle seat system comprising a piston pump according to the invention. In order to inflate or deflate one or more seat cushion areas of the vehicle seat, a piston pump is used to deliver fluid, in particular to deliver air. Since the piston pump is very compact, the piston pump can be integrated directly into the vehicle seat inside the vehicle. Since the piston pump according to the invention does not actually emit noise, no disturbing noise is caused by the piston pump during operation.

It is particularly desirable for the seat cushion regions of the vehicle to expand or contract in response to lateral acceleration on the vehicle. In this way, the side support in the seat can be improved by correspondingly inflating the side seat cushion areas, which support the person sitting on the seat, for example during a curve run. Also preferably, the piston pump according to the invention may also perform massage functions by continuous inflation or deflation of the seat cushion.

Gases and liquids may be used as the fluid for the piston pump. When used in vehicle seats, it is desirable to use air as the delivery fluid, because it does not need to provide an internal closed circulation flow.

In the following the present invention is described with reference to the drawings in a preferred embodiment.

1 is a schematic view of a piston pump according to an embodiment of the invention;

FIG. 2 is a schematic side view of the piston pump shown in FIG. 1; FIG.

3 is a schematic view of the housing- and cylinder parts of the piston pump shown in FIGS. 1 and 2;

4 is a schematic plan view of a piston pump according to the invention.

In the following, with reference to FIGS. 1 to 4, a piston pump 1 according to an embodiment of the invention is described.

As shown in FIGS. 1, 2 and 4, the piston pump according to the invention comprises four pistons 2 arranged in a row. Each of the pistons 2 comprises a crank drive 3 composed of a bar 3a, a first bolt 3b and a second bolt 3c. By means of the first bolt 3b the bar 3a is fixed in a known manner in the piston 2. The second bolt 3c is used to fix the bar 3a to the gear 4. As shown in FIG. 1, the gear 4 comprises a first spur wheel 4a and a second spur wheel 4b, which wheels are arranged on one side pin 8 in parallel with each other. The teeth of the gears are not shown in detail in FIGS. 1 to 4 for clarity. As shown in FIG. 1, the crank drive device 3 of the piston is arranged between the first wheel and the second wheels 4a and 4b, respectively, and fixed by the second bolt 3c.

The piston pump 1 according to the invention also comprises a motor 9 which drives the output shaft 5 of the motor. The worm 6 is mounted on the output shaft 5. The worm 6 is in engagement with the idler gear 7. The idler gear 7 is arranged as a gear arrangement between the worm 6 of the output shaft 5 and the gears 4 of the pistons. As shown in FIG. 1, the idler gear 7 comprises a first spur wheel 7a, a second spur wheel 7b and a worm gear 7c. The worm gear 7c is arranged in the middle between the spur wheels 7a and 7b. The worm gear 7c is engaged with the worm 6 of the output shaft 5. As shown in FIG. 1, the spur wheels 7a and 7b of the idler gear are engaged with two spur wheels 4a or 4b, respectively.

Thus, the rotational speed of the output shaft 5 is through the worm 6 to the worm gear 7c of the idler gear and from the spur wheels 7a and 7b of the idler gear 4 to the spur gear 4a of the pistons 4. , 4b). As shown in the figures, the pistons 2 are arranged adjacent to each other in a line. In this case, the first gear 4 of the series of gears, driven by the idler gear 7, drives the adjacent second gear 4 of the next piston 2, the second gear laterally. Then drive the next adjacent gear.

As shown in FIG. 2, the pistons 2 are each fixed to the gear 4 so that they are arranged offset from each other by 90 °. This measure can minimize the pulsation of the delivery flow. In addition, this allows the piston pump according to the invention to be operated more quietly.

3 schematically shows a cylinder housing which houses the pistons 2 and is covered with a cylinder cover 11. Since the valves 12 are respectively arranged on the end side of the cylinder cover 11, a space-saving structure design is possible in particular. The valves 12 are formed as check valves to facilitate control of the pump.

The gear housing of the idler gear 7 is indicated with reference numeral 14. As shown in FIG. 3, a side plate 13 is provided on which the gears 4 are rotatably supported by pins 8.

The arrangement of the crank drive 3 in accordance with the invention on the gear 4 makes it possible to design a particularly compact and flat design. In addition, by using a worm gear between the worm 6 and the idler gear 7, the piston pump 1 can be operated without noise. By using a worm gear, the speed of the output shaft 5 can be reduced in the idler gear 7 without the need for additional transmission elements. The crank drive devices 3 of the pistons 2 are powered by identically formed gears 4.

As shown in FIGS. 1 to 4, the thickness of the piston pump 1 is formed substantially in accordance with the diameter of the pistons 2 or the diameter of the cylinder. By arranging the actuators of the crankshaft one after another, the polycylinder pump or the polycylinder compressor can be designed more flatly. In addition, by using a worm gear, the number of parts can be minimized, and in particular, it can be designed to operate at a high speed and at the same time have a high reduction ratio. Of course, thin films or similar parts may be used instead of the pistons to achieve a particular pressure- or suction action of the piston pump.

Claims (12)

Piston pump for fluid delivery, At least one piston member (2) and a drive device (9) moveable within the cylinder (10), said drive device driving an output shaft (5), said output shaft (5) being a worm (6). Wherein the worm drives the gear (4), and the piston member (2) is fixed to the gear (4) by a crank drive device (3). The method of claim 1, A piston pump for fluid delivery, characterized in that a gear arrangement is arranged between the output shaft 5 including the worm 6 and the gear 4. The method of claim 2, Said gear device is formed as an idler gear (7). The method of claim 3, wherein The idler gear (7) comprises a spur wheel (7a, 7b) and a worm gear (7c) disposed adjacent to each other on the circumference of the idler gear. The method according to any one of claims 1 to 4, A piston pump for fluid delivery, characterized in that a plurality of piston members (2) are arranged in a line. The method of claim 5, A piston pump for fluid delivery, characterized in that the gears (4) of the first piston member (2) drive the gears of the adjacent second piston member. The method of claim 5, Exactly four piston members are arranged, and the crank drive devices 3 of the four piston members 2 are arranged on the gear 4 in a position offset by 90 ° with respect to an adjacent piston member, respectively. A piston pump for fluid delivery, characterized in that. The method according to any one of claims 1 to 4, The piston pump for fluid delivery, characterized in that the valves (12) of the piston pump are arranged in the cover area (11) of the cylinder (10). The method according to any one of claims 1 to 4, Said drive device (9) is a piston pump for fluid delivery, characterized in that the electric motor. Vehicle seat comprising a piston pump (1) according to any one of the preceding claims and at least one expandable or retractable seat cushion area, which can be inflated or contracted by the piston pump (1). system. The method of claim 10, Said piston pump (1) expands or contracts said seat cushion area in response to lateral acceleration applied to said vehicle. The method of claim 10, Said piston pump (1) is characterized in that the seat cushion area is continuously inflated and then contracted to provide a massage function to the person sitting on the seat.

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