CN113074159A - Hydraulic transmission device with steplessly changeable section - Google Patents
Hydraulic transmission device with steplessly changeable section Download PDFInfo
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- CN113074159A CN113074159A CN202110346991.9A CN202110346991A CN113074159A CN 113074159 A CN113074159 A CN 113074159A CN 202110346991 A CN202110346991 A CN 202110346991A CN 113074159 A CN113074159 A CN 113074159A
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- middle block
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1404—Characterised by the construction of the motor unit of the straight-cylinder type in clusters, e.g. multiple cylinders in one block
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
- F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
- F15B15/065—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement the motor being of the rack-and-pinion type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1409—Characterised by the construction of the motor unit of the straight-cylinder type with two or more independently movable working pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1414—Characterised by the construction of the motor unit of the straight-cylinder type with non-rotatable piston
- F15B15/1419—Characterised by the construction of the motor unit of the straight-cylinder type with non-rotatable piston of non-circular cross-section
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H47/00—Combinations of mechanical gearing with fluid clutches or fluid gearing
- F16H47/02—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the volumetric type
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Actuator (AREA)
Abstract
The invention relates to a hydraulic transmission device with a steplessly changeable section, which effectively solves the problem of poor adaptability of a hydraulic system to load and speed changes; the technical scheme includes that the piston assembly comprises a first cylinder body, the first cylinder body is a rectangle with openings at the upper end and the lower end, a rectangular plate is arranged in each opening at the upper end and the lower end of the first cylinder body, a piston assembly located between the two rectangular plates is arranged in the first cylinder body, the piston assembly comprises a middle block and two vertical side plates, the middle block is a triangular prism with an isosceles triangle section, the two side plates are vertically symmetrically located at two sides of the middle block, one ends of the two side plates, close to the middle block, are inclined planes corresponding to the waist edges of the middle block and are attached to the waist edges of the middle block, one ends of the two side plates, far away from the middle block, are attached to the rectangular plates at the same ends, and the side plates slide along the waist edges of the middle block to change the; the invention can steplessly adjust the effective sectional area of the hydraulic cylinder, and greatly improves the adaptability to load and speed change.
Description
Technical Field
The invention relates to the field of hydraulic equipment, in particular to a hydraulic transmission device with a steplessly changeable section.
Background
The hydraulic system is a commonly used execution and transmission component, at present, when the load and the speed of the hydraulic system change, because the hydraulic cylinder is generally a fixed effective area, the output force and the action speed of the hydraulic cylinder need to be adjusted by adjusting the oil supply pressure and the oil supply amount, the mode has poor adaptability to the load and speed change, for example, for a small load, the hydraulic cylinder is expected to have a larger action speed, the action speed can be improved only by increasing the flow at present, at the moment, the large pressure provided by the larger cross section area is a waste for the small load, and a burden is provided for the oil supply amount, the ideal mode is that the effective area is reduced, the flow is not changed or is changed in a small range, and the operation speed is accelerated, so that the efficiency is improved; for the working conditions of large load and low speed, although the speed can be reduced by adjusting the flow rate to be small, the smaller sectional area can increase the oil supply pressure at the moment, so that the bearing capacity of the hydraulic cylinder is greatly limited, and therefore, the design of the hydraulic cylinder with the variable diameter is extremely necessary no matter from the aspects of bearing capacity adjustment and transmission ratio adjustment; although some hydraulic cylinders with variable cross sections exist at present, all hydraulic cylinders are in step change, continuous area change cannot be realized, and the adaptability is still limited; in addition, in order to adjust the speed and the pressure, the current hydraulic system needs a load circuit and a large number of hydraulic valves, and has high equipment cost, high failure rate and large hydraulic energy loss.
Disclosure of Invention
Aiming at the situation, in order to overcome the defects of the prior art, the invention provides the hydraulic transmission device with the section capable of being changed steplessly, and the problems of poor adaptability of a hydraulic system to load and speed changes, complex structure and large energy loss are effectively solved.
The hydraulic transmission device comprises a first cylinder body, wherein the first cylinder body is rectangular with openings at the upper end and the lower end, rectangular plates are respectively arranged in the openings at the upper end and the lower end of the first cylinder body, a tension spring positioned outside the first cylinder body is connected between the two rectangular plates, the rectangular plates are attached to the inner wall of the first cylinder body, the two rectangular plates can slide up and down, and the left end of the first cylinder body is communicated with a liquid pipe; a piston assembly is arranged in the first cylinder body and positioned between the two rectangular plates, the piston assembly comprises a middle block and two vertical side plates, the front end and the rear end of the middle block and the front end and the rear end of each side plate are both attached to the inner wall of the first cylinder body, the middle block is a triangular prism with an isosceles triangle section, and isosceles triangle's base is on the right, two waist limits are left and two waist limits longitudinal symmetry, two sideboard longitudinal symmetry are located the both sides of middle piece, the one end that two sideboard are close to the middle piece is the inclined plane that corresponds with the waist limit of middle piece and laminates with the waist limit of middle piece, the one end that two sideboard kept away from the middle piece is laminated with the rectangular plate of holding simultaneously, the right-hand member of middle piece is connected with the first piston rod of left right direction, be fixed with the electric telescopic handle of left right direction on every sideboard, the right-hand member of first piston rod is fixed with a vertical slide bar, two electric telescopic handle's right-hand member cover is established on the slide bar and can be followed the slide bar and slided from top to bottom.
The left end of the first cylinder body is connected with a first conversion unit, the right end of the first cylinder body is connected with a second conversion unit, the first conversion unit comprises two first racks in the left-right direction, the two first racks are symmetrically arranged up and down and have opposite teeth, two ends of the two first racks are connected together to form a first rack frame, an incomplete gear is installed in the first rack frame and can be alternately meshed with the two first racks in the rotation process of the incomplete gear, so that the first rack frame reciprocates left and right, a second cylinder body is arranged between the first rack frame and the first cylinder body, the left end of the liquid pipe is communicated with the right end of the second cylinder body, a second piston is installed in the second cylinder body, the left end of the second piston is connected with a second piston rod, and the left end of the second piston rod is fixedly connected with the first rack frame; the second conversion unit comprises two second racks in the left and right directions and a rotating shaft in the front and back directions, the two second racks are arranged at intervals from top to bottom, the teeth of the second racks on the upper side face down, the teeth of the second racks on the lower side face up, a second rack frame is formed by the two second racks through fixed connection at the left and right ends, the first piston rod can push the second rack frame to reciprocate leftwards and rightwards, two gears are installed at intervals in the rotating shaft, a ratchet mechanism is arranged between each gear and the rotating shaft, the two gears drive the rotating shafts to rotate in the same direction through the ratchet mechanism, the second racks on the upper side are meshed with the upper side of one gear, and the second racks on the lower side are meshed with the lower side of the other gear.
The second-stage speed change unit is arranged between the first cylinder body and the second conversion unit and comprises a third cylinder body, a third piston capable of moving left and right is installed in the third cylinder body, the left end of the third piston is fixedly connected with the right end of the first piston rod, a plurality of cylinder sleeves positioned on the right side of the third piston are coaxially sleeved in the third cylinder body, a plunger is installed in the innermost cylinder sleeve, the right end of the plunger is fixedly connected with the second rack frame, the cylinder sleeves and the third cylinder body as well as the cylinder sleeves and the plunger are attached and can slide relatively, a nut is fixed at the right end of the third cylinder body, a threaded rod perpendicular to the axis of the third cylinder body is screwed on the nut, the threaded rod can move towards the axial direction of the third cylinder body to block any cylinder sleeve, and the blocked cylinder sleeves cannot move rightwards.
And sealing strips are respectively arranged between the side plate and the middle block and between the side plate and the rectangular plate.
The ratchet mechanism comprises ratchets which are uniformly distributed on the rotating shaft in the circumference and pawls which are arranged in inner holes of the gears, and the pawls are matched with the ratchets to ensure that the gears can only drive the rotating shaft to rotate in a single direction.
The radian of the toothed section of the incomplete gear is larger than 175 degrees and smaller than 180 degrees.
The invention can steplessly adjust the effective sectional area of the hydraulic cylinder, greatly improves the adaptability to load and speed change, can form a stepless speed change mechanism with large transmission ratio, has the advantages of large bearing capacity and high transmission efficiency, does not need a complex hydraulic loop and a large number of hydraulic valves, and has low equipment cost, low failure rate and low hydraulic energy waste.
Drawings
Fig. 1 is a front sectional view of a first cylinder block.
Fig. 2 is a front sectional view of the first cylinder, the first converting unit, and the second converting unit in combination.
Fig. 3 is a front sectional view of the first cylinder block in combination with the first switching unit, the second switching unit, and the two-stage transmission unit.
Fig. 4 is a plan view of the second rack frame.
Detailed Description
The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings.
As shown in fig. 1 to 4, the invention comprises a first cylinder body 1, wherein the first cylinder body 1 is rectangular with openings at the upper end and the lower end, a rectangular plate 2 is respectively arranged in the openings at the upper end and the lower end of the first cylinder body 1, a tension spring 3 positioned outside the first cylinder body 1 is connected between the two rectangular plates 2, the rectangular plates 2 are attached to the inner wall of the first cylinder body 1, the two rectangular plates 2 can slide up and down, and the left end of the first cylinder body 1 is communicated with a liquid pipe 4; a piston assembly positioned between two rectangular plates 2 is arranged in a first cylinder body 1, the piston assembly comprises a middle block 5 and two vertical side plates 6, the front end and the rear end of the middle block 5 and the front end and the rear end of each side plate 6 are both attached to the inner wall of the first cylinder body 1, the middle block 5 is a triangular prism with an isosceles triangle section, the bottom edge of the isosceles triangle is right, two waist edges are arranged on the left side and are vertically symmetrical, the two side plates 6 are vertically symmetrical and are positioned on two sides of the middle block 5, one ends of the two side plates 6 close to the middle block 5 are inclined planes corresponding to the waist edges of the middle block 5 and are attached to the waist edges of the middle block 5, one ends of the two side plates 6 far away from the middle block 5 are attached to the rectangular plates 2 at the same end, the right end of the middle block 5 is connected with a left-right direction first piston rod 7, a left-right direction electric telescopic rod 8 is fixed on each side plate 6, a vertical slide rod 9, the right ends of the two electric telescopic rods 8 are sleeved on the sliding rod 9 and can slide up and down along the sliding rod 9.
The left end of the first cylinder body 1 is connected with a first conversion unit, the right end is connected with a second conversion unit, the first conversion unit comprises two first racks 10 in the left-right direction, the two first racks 10 are symmetrically arranged up and down and have opposite teeth, two ends of the two first racks 10 are connected together to form a first rack 10 frame, an incomplete gear 11 is arranged in the first rack 10 frame, the incomplete gear 11 can be alternately meshed with the two first racks 10 in the rotation process, so that the first rack 10 frame reciprocates left and right, a second cylinder body 12 is arranged between the first rack 10 frame and the first cylinder body 1, the left end of the liquid pipe 4 is communicated with the right end of the second cylinder body 12, a second piston 13 is arranged in the second cylinder body 12, the left end of the second piston 13 is connected with a second piston rod 14, and the left end of the second piston rod 14 is fixedly connected with the first rack 10 frame, the first conversion unit converts the unidirectional rotation of the incomplete gear 11 into the left-right reciprocating motion of the second piston 13; the second conversion unit comprises two second racks 15 in the left-right direction and a rotating shaft 16 in the front-back direction, the two second racks 15 are arranged at intervals up and down, the teeth of the second rack 15 on the upper side face downwards, the teeth of the second rack 15 on the lower side face upwards, the left end and the right end of each of the two second racks 15 are fixedly connected to form a second rack 15 frame, the first piston rod 7 can push the second rack 15 frame to reciprocate left and right, two gears 17 are arranged on the rotating shaft 16 at intervals front and back, a ratchet mechanism is arranged between each gear 17 and the rotating shaft 16, the two gears 17 drive the rotating shaft 16 to rotate in the same direction through the ratchet mechanism, the upper second rack 15 is meshed with the upper side of one gear 17, and the lower second rack 15 is meshed with the lower side of the other gear 17; when the second rack 15 frame reciprocates left and right, the two gears 17 are driven to rotate in a reciprocating manner, the rotating directions of the two gears 17 are opposite, and due to the action of the ratchet mechanism, the two gears 17 can only drive the rotating shaft 16 to rotate in the same direction, so that the left and right reciprocating motion of the second rack 15 frame is converted into unidirectional continuous rotation of the rotating shaft 16; through the first conversion unit and the second rotation conversion unit, the first cylinder body 1 can be connected between the input shaft and the output shaft, and stepless speed change between input and output is realized.
A second-stage speed change unit is arranged between the first cylinder body 1 and the second conversion unit and comprises a third cylinder body 18, a third piston 19 capable of moving left and right is arranged in the third cylinder body 18, the left end of the third piston 19 is fixedly connected with the right end of the first piston rod 7, a plurality of cylinder sleeves 20 positioned at the right side of the third piston 19 are coaxially sleeved in the third cylinder body 18, a plunger 21 is arranged in the innermost cylinder sleeve 20, the right end of the plunger 21 is fixedly connected with a frame of the second rack 15, and between the plurality of layers of cylinder sleeves 20, the cylinder sleeve 20 and the third cylinder 18 and the cylinder sleeve 20 and the plunger 21 are attached and can slide relatively, a nut 22 is fixed at the right end of the third cylinder 18, a threaded rod 23 perpendicular to the axis of the third cylinder 18 is screwed on the nut 22, the threaded rod 23 can move towards the axial position of the third cylinder 18 to block any layer of cylinder sleeve 20, and the blocked cylinder sleeve 20 cannot move rightwards.
And sealing strips are respectively arranged between the side plate 6 and the middle block 5 and between the side plate 6 and the rectangular plate 2.
The ratchet mechanism comprises ratchets 24 which are uniformly distributed on the rotating shaft 16 in the circumference and pawls 25 which are arranged in inner holes of the gear 17, and the pawls 25 are matched with the ratchets 24, so that the gear 17 can only drive the rotating shaft 16 to rotate in a single direction.
The radian of the toothed section of the incomplete gear 11 is larger than 175 degrees and smaller than 180 degrees, so that the incomplete gear 11 is only meshed with one first rack 10 at the same time, and meanwhile, the idle period of the incomplete gear 11 which is not meshed with the two first racks 10 is as short as possible.
The first cylinder body 1 of the invention can be independently used as a hydraulic actuating element, and the specific working process is as follows: the load is loaded at the right end of the first piston rod 7, hydraulic oil is pumped into the left side of the first cylinder body 1 through the liquid pipe 4, the hydraulic oil pushes the two piston assemblies to move rightwards, when the hydraulic; when the length of the two electric telescopic rods 8 is shortened when the length-adjustable piston is applied to a working condition with large load and low speed, the electric telescopic rods 8 pull the two side plates 6 to move towards the right side of the middle block 5, the two side plates 6 move towards the right side and are simultaneously outwards separated along the waist edge of the middle block 5, and the two rectangular plates 2 are pushed to move back and forth by overcoming the action of the tension spring 3, so that the effective area of the piston assembly is increased, the thrust of the piston assembly is increased, and the movement speed of the corresponding piston assembly is reduced; when the two side plates 6 move up and down, the two electric telescopic rods 8 synchronously slide up and down along the slide rod 9.
The first cylinder body 1 is matched with the first conversion unit and the second conversion unit, so that the stepless speed change function can be realized: the incomplete gear 11 rotates in a single direction and is alternately meshed with the two first racks 10 to drive the frames of the first racks 10 to reciprocate left and right, the frames of the first racks 10 drive the second piston 13 to reciprocate left and right through the second piston rod 14, when the second piston 13 moves right, hydraulic oil in the second cylinder 12 is pumped into the first cylinder 1 through the liquid pipe 4 to push the piston assembly to move right, the piston assembly pushes the frame of the second rack 15 to move right through the first piston rod 7, when the second piston 13 moves left, the hydraulic oil in the first cylinder 1 is pumped back into the second cylinder 12, the piston assembly moves left under the action of right atmospheric pressure, and the piston assembly pulls the frame of the second rack 15 to move left; when the second rack 15 moves back and forth left and right, the two gears 17 can be driven to rotate back and forth, the rotation directions of the two gears 17 are opposite at the same moment, and due to the action of the ratchet mechanism, the two gears 17 can only drive the rotating shaft 16 to rotate in the same direction in a single direction, namely, the two gears 17 alternately drive the rotating shaft 16 to rotate in the single direction, so that the reciprocating linear motion of the second rack 15 is converted into the single-direction continuous rotation of the rotating shaft 16, and the transmission between the input of the incomplete gear 11 and the output of the rotating shaft 16 is realized; under the condition that the input rotating speed of the incomplete gear 11 is not changed, the positions of the two side plates 6 are adjusted through the electric telescopic rod 8, the left and right reciprocating motion speed of the piston assembly can be adjusted, and therefore the output rotating speed of the rotating shaft 16 is adjusted, and the stepless adjustment of the transmission ratio between the incomplete gear 11 and the rotating shaft 16 can be achieved due to the fact that the positions of the side plates 6 and the distance between the rectangular plates 2 can be adjusted in a stepless mode.
When a two-stage speed change unit is connected between the second conversion unit and the first cylinder body 1, the working principle of the two-stage speed change unit is as follows: the threaded rod 23 is made to move along the radial direction of the third cylinder 18 by rotating the threaded rod 23, when the threaded rod 23 moves towards the axis of the third cylinder 18 and the number of the cylinder sleeves 20 blocked by the threaded rod 23 is large, the number of the cylinder sleeves 20 capable of moving along with the plunger 21 is reduced, namely the sectional area of the inner cavity at the right end of the third cylinder 18 is reduced, and under the condition that the moving speed of the third piston 19 is not changed, the moving speeds of the plunger 21 and the movable cylinder sleeves 20 are increased, namely the moving speed of the frame of the second rack 15 is increased; conversely, when the piston moves in the direction away from the axis of the third cylinder 18, the number of the movable cylinder sleeves 20 is increased, that is, the sectional area of the inner cavity at the right end of the third cylinder 18 is increased, and the moving speed of the third piston 19 is not changed, the moving speed of the plunger 21 and the movable cylinder sleeve 20 is reduced, that is, the moving speed of the frame of the second rack 15 is reduced, so that the adjustment of the transmission ratio is realized;
the two-stage speed change unit can realize the step-by-step large-range adjustment of the transmission ratio, the first cylinder body 1 can realize the stepless small-range adjustment of the transmission ratio, and the two are matched to realize the stepless large-range adjustment of the transmission ratio.
The invention has the following technical effects:
1. the hydraulic cylinder capable of steplessly changing the cross section of the inner cavity is designed, so that the relationship between the ejection speed and the propelling force can be adjusted randomly according to the load, and the universality of the hydraulic cylinder is greatly improved.
2. Through the inclined plane cooperation of sideboard 6 and intermediate block 5, make intermediate block 5 and the pressure that sideboard 6 receives have the pressure of perpendicular to let off intermediate block 5 inclined plane, make sideboard 6 and intermediate block 5 compress tightly all the time when adjusting piston assembly area, keep reliable leakproofness.
3. Through the cooperation with first conversion unit and second conversion unit, can constitute a hydraulic pressure infinitely variable speed mechanism of new form, have that the bearing capacity is big, advantage that transmission efficiency is high, and need not complicated hydraulic circuit and a large amount of hydrovalves, equipment cost is low, and the fault rate is low, and hydraulic pressure can waste the volume lowly.
4. By combining with the two-stage speed change unit, the stepless speed change in a large range can be realized.
Claims (6)
1. A hydraulic transmission device with a section capable of being changed steplessly comprises a first cylinder body (1) and is characterized in that the first cylinder body (1) is rectangular with openings at the upper end and the lower end, a rectangular plate (2) is mounted in each opening at the upper end and the lower end of the first cylinder body (1), a tension spring (3) located outside the first cylinder body (1) is connected between the two rectangular plates (2), the rectangular plates (2) are attached to the inner wall of the first cylinder body (1), the two rectangular plates (2) can slide up and down, and the left end of the first cylinder body (1) is communicated with a liquid pipe (4); a piston assembly positioned between two rectangular plates (2) is arranged in a first cylinder body (1), the piston assembly comprises a middle block (5) and two vertical side plates (6), the front end and the rear end of the middle block (5) and the front end and the rear end of each side plate (6) are both attached to the inner wall of the first cylinder body (1), the middle block (5) is a triangular prism with an isosceles triangle section, the bottom side of the isosceles triangle is right, the two waist sides are arranged on the left side and are vertically symmetrical, the two side plates (6) are vertically symmetrical and are positioned on the two sides of the middle block (5), one ends of the two side plates (6) close to the middle block (5) are inclined planes corresponding to the waist sides of the middle block (5) and are attached to the waist sides of the middle block (5), one ends of the two side plates (6) far away from the middle block (5) are attached to the rectangular plates (2) at the same end, the right end of the middle block (5) is connected with a first piston rod (7, an electric telescopic rod (8) in the left-right direction is fixed on each side plate (6), a vertical sliding rod (9) is fixed at the right end of the first piston rod (7), and the right ends of the two electric telescopic rods (8) are sleeved on the sliding rod (9) and can slide up and down along the sliding rod (9).
2. The hydraulic transmission device with the section being capable of being changed steplessly as claimed in claim 1, wherein the left end of the first cylinder (1) is connected with a first conversion unit, the right end of the first cylinder is connected with a second conversion unit, the first conversion unit comprises two first racks (10) in the left-right direction, the two first racks (10) are arranged in a vertical symmetry manner and are opposite in teeth, two ends of the two first racks (10) are connected together to form a first rack (10) frame, an incomplete gear (11) is arranged in the first rack (10) frame, the incomplete gear (11) can be alternatively meshed with the two first racks (10) during rotation, so that the first rack (10) frame reciprocates left and right, a second cylinder (12) is arranged between the first rack (10) frame and the first cylinder (1), and the left end of the liquid pipe (4) is communicated with the right end of the second cylinder (12), a second piston (13) is installed in the second cylinder body (12), the left end of the second piston (13) is connected with a second piston rod (14), the left end of the second piston rod (14) is fixedly connected with the first rack (10) frame, and the first conversion unit converts the one-way rotation of the incomplete gear (11) into the left-right reciprocating motion of the second piston (13); the second conversion unit comprises two second racks (15) in the left-right direction and a rotating shaft (16) in the front-back direction, the two second racks (15) are arranged at intervals from top to bottom, the teeth of the second racks (15) on the upper side face downwards, the teeth of the second racks (15) on the lower side face upwards, two second rack (15) frames are formed by fixedly connecting the left end and the right end of each second rack (15), a first piston rod (7) can push the second rack (15) frames to reciprocate from left to right, two gears (17) are installed on the rotating shaft (16) at intervals from front to back, a ratchet mechanism is arranged between each gear (17) and the rotating shaft (16), the two gears (17) drive the rotating shaft (16) to rotate in the same direction through the ratchet mechanism, the second racks (15) on the upper side are meshed with the upper side of one gear (17), and the second racks (15) on the lower side are meshed with the lower side of the other gear (17).
3. The hydraulic transmission device with the section being steplessly changeable according to claim 2, wherein a two-stage speed changing unit is arranged between the first cylinder body (1) and the second conversion unit, the two-stage speed changing unit comprises a third cylinder body (18), a third piston (19) capable of moving left and right is installed in the third cylinder body (18), the left end of the third piston (19) is fixedly connected with the right end of the first piston rod (7), a plurality of cylinder sleeves (20) positioned on the right side of the third piston (19) are coaxially sleeved in the third cylinder body (18), a plunger (21) is installed in the innermost cylinder sleeve (20), the right end of the plunger (21) is fixedly connected with the frame of the second rack (15), a nut (22) is fixed at the right end of the third cylinder body (18), and a plurality of layers of cylinder sleeves (20), a plurality of cylinder sleeves (20) and a plurality of cylinder sleeves (18) are attached and can slide relatively, a threaded rod (23) perpendicular to the axis of the third cylinder body (18) is screwed on the nut (22), the threaded rod (23) moves towards the axial position of the third cylinder body (18) to block any layer of cylinder sleeve (20), and the blocked cylinder sleeve (20) cannot move rightwards.
4. The hydraulic transmission device with the section being changed steplessly as claimed in claim 1, wherein sealing strips are respectively installed between the side plate (6) and the middle block (5) and between the side plate (6) and the rectangular plate (2).
5. The hydraulic transmission device with the section being changed steplessly as claimed in claim 2, wherein the ratchet mechanism comprises ratchet teeth (24) circumferentially and uniformly distributed on the rotating shaft (16) and pawls (25) mounted in inner holes of the gear (17), and the pawls (25) are matched with the ratchet teeth (24) so that the gear (17) can only drive the rotating shaft (16) to rotate in one direction.
6. A hydraulic transmission device with infinitely variable cross-section according to claim 1, characterized in that the curvature of the toothed section of the partial gear (11) is greater than (175) degrees and less than (180) degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110346991.9A CN113074159A (en) | 2021-03-31 | 2021-03-31 | Hydraulic transmission device with steplessly changeable section |
Applications Claiming Priority (1)
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| CN202110346991.9A CN113074159A (en) | 2021-03-31 | 2021-03-31 | Hydraulic transmission device with steplessly changeable section |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114215896A (en) * | 2021-12-09 | 2022-03-22 | 贵州凯星液力传动机械有限公司 | Pneumatic gear shifting control mechanism |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114215896A (en) * | 2021-12-09 | 2022-03-22 | 贵州凯星液力传动机械有限公司 | Pneumatic gear shifting control mechanism |
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