A micro water hydraulic motor pump driven by a roller carriage

Abstract

A kind of micro water hydraulic motor pump driven by roller frame, including micro motor, rotating frame with roller, space cam guide rail, cross yoke and pump core piston, by micro motor shaft input an initial torque, motor shaft passes through cross yoke and transmits torque to roller rotating frame, the roller on rotating frame is under the constraint of space cam guide rail, rotating frame drives pump core piston reciprocating motion, so pump core piston does reciprocating motion and rotation motion;When piston rotates and axially moves, piston groove is communicated with two groups of holes on cylinder body perpendicular to each other respectively, the volume of piston cavity increases or reduces, and the pump realizes suction or discharge function.The micro motor of the present application is directly connected with the cross yoke in the micro pump, the structure is compact, and the volume is small;The piston driving mechanism of micro pump is arranged on one side of the piston, and oil-water separation is realized through sealing element, which improves the service life of hydraulic pump;The pump rotation speed is high, and the volumetric efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application relates to a new type of micro hydraulic pump, belonging to the field of hydraulic pump and hydraulic motor in fluid transmission and control. BACKGROUND

[0002] Micro hydraulic pump is a key basic part of aircraft, robots and high-end equipment. By realizing high power-to-weight ratio while considering the miniaturization of the structure, the competitive advantage compared with electrical transmission is obtained, which is one of the hot research problems in the field of fluid control. Foreign countries implement technical blockade on China in this field, and most of the research work at home and abroad is proportionally reduced around the structure of traditional hydraulic pump, which is not satisfactory in performance, reliability, efficiency and power-to-weight ratio. Super small displacement high pressure piston pump includes several major components such as swash plate, cylinder, piston and valve plate, adopts spherical valve, 7 pistons, wave spring and cylinder end inclined hole structure, reduces output flow pulsation, and fully reduces volume and weight. The spherical vane hydraulic pump is composed of only two vanes, swash plate and oil distribution cone, which has simple structure, small volume and realizes large displacement with small flow pulsation. The micro hydraulic pump driven by piezoelectric ceramic converts the high-frequency bidirectional vibration of piezoelectric driver into unidirectional motion of hydraulic oil through the alternating opening and closing of a pair of stop valves, so as to drive the hydraulic cylinder to move, but piezoelectric ceramic is a special linear material, which has hysteresis under the action of external electric field. The above several types of pumps have the defects of leakage, large flow resistance and poor self-priming ability. SUMMARY

[0003] In order to fill the gap of micro hydraulic motor pump in the market, the present application provides a new type of micro hydraulic pump structure, which separates the piston and the driving mechanism by a sealing ring. The driving mechanism is a new type of mechanism composed of a space cam and a roller. The mechanism is connected with a micro motor through a cross-shaped yoke. A rotating frame with a conical roller is connected with the piston. When the rotating frame rotates, it drives the piston to reciprocate under the constraint of the space cam guide rail.

[0004] The micro hydraulic motor pump driven by the roller frame designed in the present application has obvious advantages in power-to-weight ratio, volume, size and service life, which can meet the needs of various portable devices. Therefore, the product designed in the present application has a huge potential market in China.

[0005] The technical scheme adopted by the present application is as follows:

[0006] The application relates to a micro water hydraulic motor pump driven by a roller frame, which comprises a micro motor, a rotating frame with rollers, a space cam guide rail and a pump core, wherein an initial torque is inputted by a micro motor input shaft, the output torque of the motor shaft is transmitted to the roller rotating frame through a cross-shaped yoke, the rollers on the rotating frame drive the piston shaft to reciprocate under the constraint of the space cam guide rail, so that the piston shaft performs both reciprocating motion and rotating motion; when the piston rotates and axially moves, the piston groove is communicated with two groups of holes on the cylinder body, the volume of the piston cavity is increased or reduced, and the pump realizes the functions of suction and discharge.

[0007] The core working principle of the application is the driving mechanism of the tapered rollers on the roller frame of the micro water hydraulic motor pump and the space cam guide rail.

[0008] Further, the driving structure of the micro water hydraulic motor pump driven by the roller frame fixes the space cam guide rail, drives the piston to perform linear reciprocating motion and rotating motion through the high-speed rotating frame and the tapered rollers installed on the rotating frame.

[0009] Further, the motor is connected with the pump shell, and the motor shaft transmits the torque through the cross-shaped yoke.

[0010] Further, the tapered rollers are installed on the rotating frame, and the micro deep groove ball bearings are installed in series between the tapered rollers and the space cam guide rail, the tapered rollers can contact with the space cam guide rail, and the rotating frame is installed on the piston of the pump core.

[0011] Preferably, the cylinder body is provided with a right-angle two-way plug and a pump outlet connector, two outlet channels in the cylinder body are merged into the pump outlet connector through the right-angle two-way plug, and a sleeve is installed on the outer side of the cylinder body to block the two high-pressure windows on the cylinder body and the right-angle two-way plug.

[0012] The space cam guide rails are installed on the two sides of the single pump body respectively, the motor shaft is coincident with the rotation center of the piston shaft and the space cam guide rail.

[0013] The cam surfaces of the left and right space cam guide rails are in the shape of tapered saddle and are fixed on the piston shaft.

[0014] The piston is provided with two axial flow distribution grooves in the circumferential direction.

[0015] The working principle of the application is as follows: when the motor starts, an initial torque is inputted by the motor shaft, the output torque of the motor shaft is transmitted to the rotating frame through the cross-shaped yoke, the tapered rollers on the rotating frame drive the piston of the pump core to reciprocate under the constraint of the space cam guide rail, so that the piston performs both reciprocating motion and rotating motion; when the piston rotates and axially moves, the piston groove is communicated with two groups of holes on the cylinder body, the volume of the piston cavity is increased or reduced, and the pump realizes the functions of suction and discharge.

[0016] The micro water hydraulic motor pump integrates the driving mechanism and the micro motor, separates the driving mechanism and the piston, has good sealing property, is light in weight, separates water and oil, reduces the volume of the pump, prolongs the service life of the pump, has high speed and high efficiency, greatly reduces the working space and the mass of components, greatly reduces the whole structure of the pump, and improves the working efficiency.

[0017] The micro water hydraulic motor pump integrates the driving mechanism and the micro motor, separates the driving mechanism and the piston, has good sealing property, is light in weight, separates water and oil, reduces the volume of the pump, prolongs the service life of the pump, has high speed and high efficiency, greatly reduces the working space and the mass of components, greatly reduces the whole structure of the pump, and improves the working efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a structural schematic diagram of the micro water hydraulic motor pump.

[0019] Figure 2 Fig. 3 is a high-speed rotating frame structure diagram, wherein (a) is a structural diagram, and (b) is a B-B sectional view of (a).

[0020] Figure 3 Fig. 4 is a piston structure diagram, wherein (a) is a structural diagram, (b) is an A-A sectional view of (a), and (c) is a B-B sectional view of (a).

[0021] Figure 4 Fig. 5 is a cylinder structure diagram, wherein (a) is a structural diagram, and (b) is an A-A sectional view of (a).

[0022] Figure 5 Fig. 6 is a bearing mandrel structure diagram.

[0023] Figure 6 Fig. 7 is a space right cam guide structure diagram, wherein (a) is a space right cam guide front view, (b) is a space right cam guide half sectional view, and (c) is a space right cam guide top view.

[0024] Figure 7 Fig. 8 is a space left cam guide structure diagram, wherein (a) is a space left cam guide front view, (b) is a space left cam guide half sectional view, and (c) is a space left cam guide top view.

[0025] Figure 8 Fig. 9 is a three-way plug structure diagram, wherein (a) is a structural diagram, and (b) is a sectional view.

[0026] Figure 9 Figure 3 is a structural diagram of a right-angle two-way plug.

[0027] Figure 10 Figure 4 is a structural diagram of a lever, wherein (a) is a structural diagram, and (b) is an A-A sectional view of (a).

[0028] Figure 11 Figure 5 is a structural diagram of a retainer.

[0029] Figure 12 Figure 6 is a structural diagram of a cone roller. DETAILED DESCRIPTION

[0030] The application will be further described below with reference to the accompanying drawings.

[0031] Reference Figures 1-12 A roller frame driven micro water hydraulic motor pump, comprising a micro motor, a rotating frame with rollers, a space cam guide rail and a pump core piston 5, an initial torque is input by a micro motor shaft 12, the output torque of the micro motor shaft 12 is transmitted to a cross lever 15, thereby driving a high-speed rotating frame 8 to rotate, the cone rollers 10 on the high-speed rotating frame 8 are constrained by a space right cam guide rail 21 and a space left cam guide rail 14 when rotating, thereby driving the pump core piston 5 to make both rotating and reciprocating movements, when the pump core piston 5 rotates and moves axially, the piston groove is communicated with two groups of holes on the cylinder body 7, the volume of the piston cavity increases or decreases, and the pump realizes the functions of suction and discharge.

[0032] The core working principle of the whole device is the driving mechanism of the cone rollers 10 on the high-speed rotating frame 8 of the roller frame driven micro water hydraulic motor pump and the space cam guide rail. The torque of the micro motor is transmitted to the cone rollers 10 on the high-speed rotating frame 8 through the motor shaft, the cone rollers 10 on the high-speed rotating frame 8 drive the piston to make both reciprocating and rotating movements under the constraint of the space right cam guide rail 21 and the space left cam guide rail 14, and thus compared with the traditional water hydraulic pump, the structure size of the whole pump is greatly reduced under the condition that the production precision is high enough.

[0033] The structure of the roller frame driven micro water hydraulic motor pump fixes the left and right space cam guide rails, drives the piston to make both reciprocating and rotating movements through the high-speed rotating frame 8 and the cone rollers 10 installed on the rotating frame 8.

[0034] The motor 12 is connected with the pump shell 11 through four inner hexagonal cylindrical head screws 23, the motor shaft transmits the torque through the cross lever, the cross lever is connected with the inner hexagonal flat end set screw 17, and the shell is connected with the left space cam guide rail through the positioning pin.

[0035] The cross-shaped fork is connected with the rotating frame through a linear sliding bearing, and the plane retainer of the linear sliding bearing has a steel ball raceway which respectively contacts with the cross-shaped fork and the rotating frame 8.

[0036] The cylinder 7 is provided with a right-angle two-way plug 3 and a pump outlet connector, and two outlet channels in the cylinder 7 are merged into the pump outlet connector through the right-angle two-way plug 3. The sleeve 2 is installed on the outside of the cylinder 7 to block the two high-pressure windows on the cylinder 7 and the right-angle two-way plug 3.

[0037] The space cam is respectively installed on both sides of the single pump body and connected with the piston. The rotation center of the motor shaft coincides with the space cam and the piston.

[0038] The cam surfaces of the left and right space cam guides are conical saddle-shaped and fixed on the shaft. During operation, the two conical rollers simultaneously contact to form a rolling pair. The two cams are one-to-one corresponding in the highest point.

[0039] The piston 5 is provided with two axial flow distribution grooves which are circumferentially distributed and are spaced apart from the sealing cavity. The cylinder is provided with two high-pressure suction windows with a phase difference of 180 degrees. After the piston is inserted into the cylinder, the piston is matched with the sink groove on the high-pressure port of the cylinder. This structure makes the volume of the cavities on both sides of the piston change when the piston performs linear reciprocating motion and rotary motion, so that the pressure of the corresponding cavities is changed.

[0040] The content described in the embodiments of the present specification is only a list of implementation forms of the inventive concept, and the protection scope of the present application should not be regarded as being limited to the specific forms stated in the embodiments. The protection scope of the present application also extends to equivalent technical means that can be thought of by those skilled in the art according to the inventive concept.

Claims

1. A micro water hydraulic motor pump driven by a roller carriage, characterized in that, The micro motor, the rotating frame with the rollers, the space cam guide rail and the pump core piston are included, an initial torque is inputted by the motor shaft, the motor output torque is transmitted to the roller rotating frame through the cross-shaped yoke, the rollers on the rotating frame are restricted by the space cam guide rail, and the pump core piston is driven to reciprocate, so that the pump core piston rotates and reciprocates; when the piston rotates and axially moves, the piston groove is communicated with two groups of 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 driving structure of the micro water hydraulic motor pump driven by the roller frame, two space cam guide rails are fixed, the roller frame is in the middle of the two space cam guide rails, the cross-shaped yoke is inserted in the roller frame, after the roller frame rotates, the cam-roller pair makes the rotating frame drive the piston to linear reciprocate and rotate. The motor is connected with the pump shell, and the motor shaft is connected with the cross-shaped yoke. The conical rollers are installed on the rotating frame, and the series micro deep groove ball bearings are installed between them, the conical rollers can contact with the space cam guide rail, and the pump core shaft is installed on the rotating frame. The cylinder body is provided with a right-angle two-way plug and a pump outlet connector, two outlet channels in the cylinder body are merged into the pump outlet connector through the right-angle two-way plug, and the sleeve is installed on the outer side of the cylinder body to block the two high-pressure windows and the right-angle two-way plug on the cylinder body.

2. A micro hydro hydraulic motor pump driven by a roller carriage as claimed in claim 1, wherein, The space cam guide rails are installed on the pump body and the pump cover respectively, the roller rotating frame is in the middle of the two cam guide rails, the motor shaft is coincided with the rotation center of the space cam guide rail and the pump core piston.

3. A micro hydrostatic motor pump driven by a roller carriage as claimed in claim 1, wherein, The cam surfaces of the left and right space cam guide rails are saddle-shaped conical surfaces.

4. A micro hydrostatic motor pump driven by a roller carriage as claimed in claim 1, wherein, The piston is provided with two axial flow distribution grooves in the circumferential direction.

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