CN111997865A

CN111997865A - Miniature water hydraulic motor pump driven by roller carrier

Info

Publication number: CN111997865A
Application number: CN202010894154.5A
Authority: CN
Inventors: 邢彤; 郭潇恬; 吴昊; 靳金全; 贾兴稣; 阮健
Original assignee: Zhejiang University of Technology ZJUT
Current assignee: Zhejiang University of Technology ZJUT
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2020-11-27

Abstract

A miniature water hydraulic motor pump driven by a roller frame comprises a miniature motor, a rotating frame with rollers, a space cam guide rail, a cross-shaped shifting fork and a pump core piston, wherein an initial torque is input by a miniature motor shaft, the motor shaft transmits the torque to the roller rotating frame through the cross-shaped shifting fork, and the roller on the rotating frame drives the pump core piston to reciprocate under the constraint of the space cam guide rail, so that the pump core piston does reciprocating motion and rotary motion; when the piston rotates and moves axially, the piston grooves are respectively communicated with two groups of mutually vertical holes on the cylinder body, the volume of the piston cavity is increased or reduced, and the pump realizes the suction or discharge function. The miniature motor is directly connected with the cross-shaped shifting fork in the miniature pump, so that the structure is compact and the size is small; the piston driving mechanism of the micro pump is arranged on one side of the piston, oil-water separation is realized through the sealing element, and the service life of the hydraulic pump is prolonged; the pump has high rotating speed and high volumetric efficiency.

Description

Miniature water hydraulic motor pump driven by roller carrier

Technical Field

The invention relates to a novel miniature hydraulic pump, and belongs to hydraulic pumps and hydraulic motors in the field of fluid transmission and control.

Background

The microminiature hydraulic pump is a key basic part of aircrafts, robots, high-end equipment and the like. The high power-weight ratio is realized, and the microminiaturization of the structure is considered, so that the competitive advantage compared with the electric transmission is obtained, and the method is one of the hot research problems in the field of flow control. The technical blockade is carried out in the field abroad on China, and the research work at home and abroad is mostly reduced in proportion around the structure of the traditional hydraulic pump, so that the hydraulic pump is unsatisfactory in various aspects such as performance, reliability, efficiency, power-weight ratio and the like. The ultra-small displacement high-pressure plunger pump comprises a swash plate, a cylinder body, plungers, a valve plate and other large components, adopts a spherical flow distribution structure, and adopts structures such as 7 plungers, a wave spring, a cylinder body tail end inclined hole and the like, so that output flow pulsation is reduced, and the volume and weight are fully reduced. The spherical vane hydraulic pump only comprises 2 vanes, a swash plate, an oil distribution cone and the like, and has the advantages of simple structure, small volume, large discharge capacity and small flow pulsation. The piezoelectric ceramic driven miniature hydraulic pump makes the high frequency bidirectional vibration of the piezoelectric driver converted into the unidirectional motion of the hydraulic oil through the alternate opening and closing of the pair of stop valves, thereby driving the hydraulic cylinder to move, but the piezoelectric ceramic is a special linear material and has hysteresis under the action of an external electric field. The above types of pumps all suffer from leakage problems, high flow resistance, poor self-absorption, etc.

Disclosure of Invention

In order to fill the blank of a miniature water hydraulic motor pump on the market, the invention provides a novel miniature hydraulic pump structure, a piston and a driving mechanism are separated by a sealing ring by the pump, the driving mechanism is a novel mechanism consisting of a space cam and a roller, the mechanism is connected with a miniature motor through a cross-shaped shifting fork, a rotating frame with a cone roller is connected with the piston, and the piston is driven to reciprocate under the constraint of a space cam guide rail when the rotating frame rotates.

The micro water hydraulic motor pump driven by the roller frame has obvious advantages in power-weight ratio, volume, size and service life, and can meet the requirements of various portable devices. Therefore, the product designed by the invention has huge potential market in China.

The technical scheme adopted by the invention is as follows:

a miniature water hydraulic motor pump driven by a roller frame comprises a miniature motor, a rotating frame with rollers, a space cam guide rail and a pump core, wherein an initial torque is input by an input shaft of the miniature motor, the output torque of a motor shaft is transmitted to the roller rotating frame through a cross-shaped shifting fork, and the rollers on the rotating frame drive a piston shaft to reciprocate under the constraint of the space cam guide rail, so that the piston shaft does reciprocating motion and rotary motion; when the piston rotates and moves axially, the piston grooves are respectively communicated with two groups of mutually vertical holes on the cylinder body, the volume of the piston cavity is increased or reduced, and the pump realizes the suction or discharge function.

The core working principle of the invention is a driving mechanism of a cone roller and a space cam guide rail on a roller carrier in a micro hydraulic motor pump driven by the roller carrier.

Furthermore, the driving structure of the micro water hydraulic motor pump driven by the roller frame fixes the space cam guide rail, and drives the piston to do linear reciprocating motion and rotary motion through the high-speed rotating frame and the cone roller arranged on the rotating frame.

Still further, the motor link to each other with the pump case, the motor shaft passes through the transmission moment of torsion of cross shift fork.

Furthermore, the cone roller is arranged on a rotating frame, a series-connected micro deep groove ball bearing is arranged between the cone roller and the rotating frame, the cone roller can be contacted with the space cam guide rail, and the rotating frame is arranged on a pump core piston.

Preferably, the cylinder body is provided with a right-angle two-way plug and an outlet joint of the pump, and two outlet channels in the cylinder body converge into the outlet joint of the pump through the right-angle two-way plug. The sleeve is arranged on the outer side of the cylinder body and blocks the two high-pressure windows and the right-angle two-way plug on the cylinder body.

The space cam guide rails are respectively installed on two sides of a single pump body, and a motor shaft is overlapped with the rotation centers of the space cam guide rails and the piston shaft.

The cam surfaces of the left and right space cam guide rails are in a conical surface saddle shape and are fixed on the piston shaft.

The piston is provided with 2 axial distribution grooves which are distributed circumferentially.

The working principle of the invention is as follows: when the motor is started, an initial torque is input by the motor shaft, and the output torque is transmitted to the rotating frame by the motor shaft through the cross-shaped shifting fork. The conical roller on the rotating frame drives the pump core piston to reciprocate under the constraint of the space cam guide rail, so that the piston does reciprocating motion and also does rotating motion. When the piston rotates and moves axially, the piston grooves are respectively communicated with two groups of mutually vertical holes on the cylinder body, the volume of the piston cavity is increased or reduced, and the pump realizes the suction or discharge function.

The invention designs a micro water hydraulic motor pump, which integrates a driving mechanism and a micro motor, and a sealing structure is designed between the pump driving mechanism and a pump functional part, so that lubricating oil of the driving mechanism is separated from pumped liquid, the mechanical efficiency is improved, and the service life is prolonged. The pump has high power-weight ratio, high working speed and high volumetric efficiency. The pump can convey various fluids due to the oil-water separation.

The invention has the beneficial effects that: the micro water hydraulic motor pump driven by the roller frame has the advantages that the driving mechanism and the micro motor are integrally designed, the driving mechanism and the piston are separated, so that the pump has good tightness, and meanwhile, the pump has the characteristics of light weight, water-oil separation, reduced pump volume, prolonged service life and the like, can realize high-speed and high-efficiency working characteristics, and simultaneously greatly reduces working space and element quality, so that the whole structure of the pump is greatly reduced, and the working efficiency is improved; compared with a hydraulic element of an oil medium, the miniature high-speed rotating frame structure water hydraulic motor pump also has the advantages of small pollution, safety and the like.

Drawings

Fig. 1 is a schematic structural view of a micro water hydraulic motor pump driven by a roller frame according to the present invention.

FIG. 2 is a structural view of a high-speed rotating frame, wherein (a) is a structural view and (B) is a sectional view taken along line B-B of (a).

FIG. 3 is a structural view of a piston, wherein (a) is a structural view, (B) is a sectional view taken along line A-A of (a), and (c) is a sectional view taken along line B-B of (a).

FIG. 4 is a structural view of a cylinder block, wherein (a) is a structural view and (b) is a sectional view taken along line A-A of (a).

Fig. 5 is a structural view of a bearing mandrel.

Fig. 6 is a structural view of the spatial right cam guide, in which (a) is a front view of the spatial right cam guide, (b) is a half sectional view of the spatial right cam guide, and (c) is a plan view of the spatial right cam guide.

Fig. 7 is a structural view of the spatial left cam guide, in which (a) is a front view of the spatial left cam guide, (b) is a half sectional view of the spatial left cam guide, and (c) is a plan view of the spatial left cam guide.

FIG. 8 is a structural view of a three-way plug, wherein (a) is a structural view and (b) is a sectional view.

Fig. 9 is a block diagram of a two-way plug with right angles.

FIG. 10 is a structural view of the shift lever, wherein (a) is a structural view and (b) is a sectional view taken along line A-A of (a).

Fig. 11 is a structural view of the holder.

FIG. 12 is a block diagram of a cone roller.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

Referring to fig. 1 to 12, a micro water hydraulic motor pump driven by a roller frame comprises a micro motor, a rotating frame with rollers, a space cam guide rail and a pump core piston 5, wherein an initial torque is input by a micro motor shaft 12, the micro motor shaft 12 transmits the output torque to a cross-shaped shifting fork 15 so as to drive a high-speed rotating frame 8 to rotate, conical rollers 10 uniformly distributed on the circumference of the high-speed rotating frame 8 are restrained by a space right cam guide rail 21 and a space left cam guide rail 14 during rotation to drive the pump core piston 5 to do both rotary motion and reciprocating motion, when the pump core piston 5 rotates and axially moves, piston grooves are respectively communicated with two groups of mutually vertical holes on a cylinder body 7, the volume of a piston cavity is increased or reduced, and the pump realizes the suction or discharge function

The core working principle of the whole device is that a cone roller 10 on a high-speed rotating frame 8 in a micro hydraulic motor pump driven by a roller frame and a driving mechanism of a space cam guide rail are arranged. The torque of the micro motor is transmitted to the conical roller 10 on the high-speed rotating frame 8 through the motor shaft, the conical roller 10 on the high-speed rotating frame 8 drives the piston to do reciprocating motion and rotating motion under the constraint of the space right cam guide rail 21 and the space left cam guide rail 14, and therefore compared with a traditional water hydraulic pump, the structure size of the whole pump is greatly reduced under the condition that the production precision is high enough.

The micro water hydraulic motor pump structure driven by the roller frame fixes the left and right space cam guide rails, and drives the piston to do reciprocating motion and rotary motion through the high-speed rotating frame 8 and the cone roller 10 arranged on the rotating frame 8.

The motor 12 is connected with the pump shell 11 through 4 inner hexagonal socket head cap screws 23, the motor shaft transmits torque through a cross shifting fork, the motor shaft is connected with the cross shifting fork through inner hexagonal flat end set screws 17, and the machine shell is connected with a left space cam guide rail through a positioning pin.

The cross-shaped shifting fork is connected with the rotating frame through a linear sliding bearing, and a plane retainer of the linear sliding bearing is provided with a steel ball raceway which is respectively contacted with the cross-shaped shifting fork and the rotating frame 8.

The cylinder body 7 is provided with a right-angle two-way plug 3 and an outlet joint, and two outlet channels in the cylinder body 7 converge into the outlet joint through the right-angle two-way plug 3. The sleeve 2 is arranged on the outer side of the cylinder body 7 and blocks two high-pressure windows and the right-angle two-way plug 3 on the cylinder body 7.

The space cams are respectively arranged on two sides of a single pump body and connected with the piston. The motor shaft is superposed with the space cam and the rotation center of the piston.

The cam surface shapes of the left space cam guide rail and the right space cam guide rail are in a conical surface saddle shape, are fixed on a shaft, and are simultaneously contacted with two conical rollers to form a rolling pair during working. The two cams are respectively in one-to-one correspondence with the phase of the highest point.

The piston 5 is provided with 2 axial distribution grooves distributed circumferentially, the 2 grooves are communicated with the sealed containing cavity at intervals, the cylinder body is provided with two high-pressure suction windows, the phase difference is 180 degrees, and the piston is matched with the undercut groove on the high-pressure port on the cylinder body after being inserted into the cylinder body. The structure makes the volume of the cavity on two sides of the piston change when the piston performs reciprocating linear motion and rotary motion, so that the pressure of the corresponding cavity is changed.

The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the present invention should not be considered limited to the specific forms set forth in the embodiments but rather by the equivalents thereof as may occur to those skilled in the art upon consideration of the present inventive concept.

Claims

1. A miniature water hydraulic motor pump driven by a roller frame is characterized by comprising a miniature motor, a rotating frame with rollers, a space cam guide rail and a pump core piston, wherein an initial torque is input by a motor shaft, the output torque of the motor is transmitted to the roller rotating frame through a cross shifting fork, and the rollers on the rotating frame drive the pump core piston to reciprocate under the constraint of the space cam guide rail, so that the pump core piston does reciprocating motion and rotary motion; when the piston rotates and moves axially, the piston grooves are respectively communicated with two groups of mutually vertical holes on the cylinder body, the volume of the piston cavity is increased or reduced, and the pump realizes the suction or discharge function.

2. The micro hydro-hydraulic motor pump driven by a roller frame as claimed in claim 1, wherein the driving structure of the micro hydro-hydraulic motor pump driven by the roller frame is that two space cam rails are fixed, the roller frame is arranged between the two space cam rails, the cross-shaped shifting fork is inserted into the roller frame, and after the roller frame rotates, the piston is driven by the rotating frame to do linear reciprocating motion and rotating motion through the cam-roller pair.

3. A micro hydro-hydraulic motor pump driven by a roller frame as claimed in claim 1 or 2, wherein the motor is connected to a pump housing, and a motor shaft is connected to a cross-shaped fork.

4. A roller frame driven micro hydro-hydraulic motor pump as claimed in claim 1 or 2, wherein the cone rollers are mounted on the rotary frame with micro deep groove ball bearings in series mounted therebetween, the cone rollers are capable of contacting the space cam track, and the pump spindle is mounted on the rotary frame.

5. A roller frame driven micro hydro-hydraulic motor pump as claimed in claim 1 or 2, wherein the cylinder body has a right angle two-way plug and a pump outlet connector, the two outlet passages in the cylinder body converge into the pump outlet connector through the right angle two-way plug, and the sleeve is mounted on the outside of the cylinder body to block the two high pressure windows and the right angle two-way plug on the cylinder body.

6. A roller frame driven micro hydro-hydraulic motor pump as claimed in claim 1 or 2, wherein the space cam guide is installed on the pump body and the pump cover respectively, the roller rotating frame is located between the two cam guide, and the motor shaft coincides with the space cam guide and the rotation center of the pump core piston.

7. The micro hydrohydraulic motor pump according to claim 1 or 2, wherein the cam surfaces of the left and right space cam rails are saddle-shaped conical surfaces.

8. A roller frame driven micro hydro-hydraulic motor pump as claimed in claim 1 or 2, wherein the piston has 2 circumferentially distributed axial distribution grooves.