CN204591606U - Two-dimensional equal-acceleration and equal-deceleration guide rail axial piston pump - Google Patents

Abstract

The utility model discloses a two-dimensional equal acceleration and equal deceleration guide rail axial piston pump, comprising a pump body, a cylinder body and a piston, wherein the cylinder body is arranged in the pump body and fixedly connected to the pump body; an oil suction and discharge hole and a leakage oil return channel are opened on the pump body, and a left end cover and a right end cover are respectively fixedly installed on the left and right ends of the pump body through a retaining spring, and a left guide rail and a right guide rail having the same roller rolling surface are respectively fixed on the left and right ends of the cylinder body, and the left guide rail and the right guide rail are arranged 90 degrees apart from each other; a piston is arranged at the center of the inner cavity of the cylinder body, and the piston can make a linear reciprocating motion along the axial direction of the inner cavity of the cylinder body; a left plug ring and a right plug ring concentric with the piston are respectively installed on the left and right ends of the piston, and the left plug ring and the right plug ring are respectively fixed on the cylinder body; the space enclosed by the left plug ring, the left end of the piston and the cylinder body constitutes a left chamber, and the space enclosed by the right plug ring, the right end of the piston and the cylinder body constitutes a right chamber, and the volumes of the left chamber and the right chamber change alternately with the reciprocating motion of the piston.

Description

Two-dimensional constant acceleration and constant deceleration guide rail axial piston pump

technical field

The utility model relates to a two-dimensional equal acceleration and equal deceleration guide rail axial piston pump, which belongs to hydraulic pumps and hydraulic motors in the field of fluid transmission and control.

Background technique

The piston pump uses a piston and a cylinder block as the main working components. When the piston reciprocates in the piston hole of the cylinder body, the volume of the closed working volume chamber composed of the piston and the cylinder body changes to complete the oil suction and discharge process. According to the different arrangements of the piston in the cylinder, the piston pump is divided into two categories: radial type and axial type. Due to its complex structure and large volume, radial piston pumps have been replaced by axial piston pumps in many occasions. The piston centerline of an axial piston pump is parallel (or substantially parallel) to the axis of the cylinder block. This type of pump has good sealing performance, high working pressure (rated working pressure can generally reach 32-40MPa), and can still maintain a relatively high volumetric efficiency (generally around 95%) and total efficiency (generally around 90%) under high pressure. Above), it is easy to realize the advantages of variable and light weight per unit power; it is widely used in the fields of pressure processing machinery, lifting and transportation equipment, engineering machinery, ship deck machinery, metallurgical machinery, artillery and space technology, and can be used as high pressure and High pressure oil source.

The working principle of the traditional common axial piston pump: when the transmission shaft drives the cylinder body to rotate, the cylinder body drives the piston to rotate, and by changing the angle between the piston and the inclined plane or the transmission shaft, the piston moves in the piston cavity. Linear reciprocating motion. Relying on the reciprocating movement of the piston in the cylinder hole, the volume of the sealed working chamber changes to realize oil suction and pressure. The traditional axial piston pump has many relatively moving parts inside, has high requirements on material and machining accuracy, is sensitive to oil pollution, has high requirements and costs for processing, use, and maintenance, and is expensive; the cylinder block is accompanied by the transmission shaft Rotation, the moment of inertia is large, resulting in slow response to start, stop, and speed regulation, which is not conducive to controlling the output flow of the pump through speed regulation; there are many friction pairs in the cylinder, and the cylinder temperature rises faster under high-speed rotation, and the flow distribution The wear of parts such as discs and pistons directly affects the service life and durability of the pump. In addition, due to the limitation of the working principle of the piston pump itself, each piston can only achieve one oil suction and one oil discharge when the transmission shaft rotates one revolution, and its displacement is limited.

Contents of the invention

In order to overcome the above-mentioned defects existing in the existing axial piston pump, the utility model provides a novel and compact structure, small size, light weight, simple transmission, easy speed regulation, high displacement, and the use of dual degrees of freedom of the piston (rotating while being able to Axial movement) motion principle to achieve continuous oil suction and discharge two-dimensional equal acceleration and deceleration guide rail axial piston pump.

The technical scheme that the utility model adopts is:

Two-dimensional constant acceleration and constant deceleration guide rail axial piston pump, including pump body, cylinder body and piston. The left and right ends of the pump body are respectively fixed with left and right end covers by means of circlips. It is characterized in that: the left and right ends of the cylinder body are respectively fixed with left and right guide rails with the same rolling surface of the rollers. , and the left guide rail and the right guide rail are staggered by 90 degrees, that is, the highest point and the lowest point of the left guide rail correspond to the lowest point and the highest point of the right guide rail respectively;

The center of the inner cavity of the cylinder is provided with a piston, and the piston can reciprocate linearly along the axial direction of the inner cavity of the cylinder; The left plug ring and the right plug ring, the left plug ring and the right plug ring are respectively fixed on the cylinder body; the space enclosed by the left plug ring, the left end of the piston and the cylinder body constitutes the left chamber, and the described The space enclosed by the right plug ring, the right end of the piston and the cylinder constitutes the right chamber, and the volumes of the left chamber and the right chamber change alternately with the reciprocating motion of the piston; when the piston moves axially from the leftmost end to the rightmost end, the left chamber The volume of the chamber gradually increases, and the volume of the right chamber gradually decreases; on the contrary, when the piston moves axially from the rightmost end to the leftmost end, the volume of the right chamber gradually increases, and the volume of the left chamber gradually decreases;

The piston is provided with a shoulder, and the surface of the shoulder is provided with four rectangular grooves evenly arranged, and the positions of the notches of the four rectangular grooves are mutually staggered; the corresponding cylinder body There are two groups of windows corresponding to the four rectangular grooves evenly distributed on the position, and the two groups of windows communicate with each other through the annular grooves on the surface of the cylinder body; when working, the rectangular grooves on the piston and the windows on the cylinder body occur Communication, the chamber with gradually larger volume absorbs oil from the fuel tank through the communicating rectangular groove and window, and the chamber with gradually decreasing volume discharges the oil in the chamber through the communicating groove and window;

The left end of the piston is equipped with a pin shaft, and a group of large left bearing rollers is symmetrically installed on the shaft end of the pin shaft, and a roller cover fixedly connected with the left end cover is installed on the left end of the pin shaft. , the straight pin is fastened on the piston; the right end of the piston is equipped with a cross pin, and the shaft ends of the cross pin are symmetrically installed with a group of right bearing large rollers and a group of transmission Torque bearing small roller, the cross pin shaft is fastened on the piston; the left bearing large roller and the right bearing large roller are respectively arranged on the left guide rail and the right guide rail, and can move along the left guide rail and the right guide rail respectively. right rail scrolling;

The cross pin shaft is installed on the right end cover with a through hole through the 2D coupling, and the brushless motor is tightly matched with the 2D coupling, and the brushless motor transfers the torque through the 2D coupling The transmission is transmitted to the small roller of the bearing, which drives the small roller of the bearing to rotate, thereby driving the cross pin shaft, the piston and the slotted pin shaft to rotate together. When the motor drives the 2D coupling to rotate, the 2D coupling transmits the torque to the piston through the small bearing roller on the cross pin shaft, so that the piston rotates, and the piston rotates and reciprocates at the same time to realize the switching and continuous oil suction and discharge chamber. Suction and discharge of oil.

Both the left guide rail and the right guide rail are cylinders, the top surface of the cylinder has an outwardly convex curved surface, and the cylinders at both ends of the lowest point of the curved surface are symmetrically arranged with The mounting hole matched with the pin; the center of the cylinder is provided with a through hole matched with the hexagon socket bolt.

The large right bearing roller and the small bearing roller are respectively arranged on the grooves of the 2D coupling; the 2D coupling is installed on the right end cover with a through hole through the first steel wire retaining ring and the locking washer superior.

The right end of the 2D shaft coupling has a rectangular keyway matched with the brushless motor.

A J-shaped frameless oil seal and a copper sheet are installed between the right end cover and the 2D coupling for sealing and reducing the friction between the coupling and the end cover.

The left bearing large roller, the right bearing large roller, and the bearing small roller are respectively composed of a wheel sleeve, a rolling bearing, a second steel wire retaining ring and a lock washer. The second steel wire retaining ring and the lock washer are sleeved on the rolling bearing.

The left and right end caps are provided with annular grooves for placing O-rings.

The left plug ring and the right plug ring are respectively fixed on the cylinder body through the third steel wire retaining ring.

The flat pin shaft and the cross pin shaft are respectively fastened to the left and right ends of the piston by hexagon socket bolts.

Working principle of the utility model:

The piston, the cross pin shaft and the flat pin shaft are fixedly connected together by the hexagon socket head bolts, the brushless motor transmits the torque to the small bearing roller on the cross pin shaft through the 2D coupling, and drives the small bearing roller to rotate, and the right bearing large roller As the small roller of the bearing rotates with the 2D coupling, the large roller of the right bearing will also roll on the right guide rail. In the same way, the large roller of the left bearing will also roll on the inner guide rail while rotating on the left end flat pin. When the large roller of the left bearing rolls to the highest point of the left guide rail, that is, the large roller of the right bearing rolls to the lowest point of the right guide rail, and the piston moves axially to the leftmost end; when the large roller of the left bearing rolls to the lowest point of the left guide rail, that is The large roller of the right bearing rolls to the highest point of the right guide rail, and the piston axially moves to the far right. As the large roller of the left bearing and the large roller of the right bearing roll continuously on the left guide rail and the right guide rail respectively, the piston can be continuously reciprocated in the axial direction, realizing continuous reciprocation in the axial direction while the piston rotates continuously in the longitudinal direction sports.

The beneficial effects of the utility model are reflected in:

1. The integrated design of the shaft and the piston is proposed, which greatly simplifies the overall structure, and uses the dual-degree-of-freedom (2D) structure of the rotation and sliding of the piston to replace the oil distribution plate structure of the traditional axial piston pump to achieve continuous oil suction and discharge Function, and reciprocate once, oil suction and discharge once, one more time than the traditional axial piston pump.

2. Compared with the multi-friction pair structure of the traditional piston pump, the utility model has only one pair of friction pairs, so that the efficiency is greatly improved.

3. Miniaturization is realized, and the cost is greatly reduced under the premise of ensuring the flow rate.

4. The rectangular groove on the piston communicates with the window on the cylinder block. The chamber with gradually larger volume absorbs oil from the fuel tank through the communicating rectangular groove and window, and the chamber with gradually decreasing volume passes through the communicating groove and window. The oil in the chamber is discharged; the continuous reciprocating movement of the piston makes the volume of the left and right chambers alternately change continuously, realizing continuous oil absorption and oil discharge.

5. The structure of the left guide rail and the right guide rail are the same, the curves of the left bearing large roller and the right bearing large roller rolling on their respective guide rails are the same, and the two are misplaced by 90 degrees, the highest point and the lowest point of the left guide rail are respectively the same as the right guide rail The lowest point corresponds to the highest point.

Description of drawings

Fig. 1 is a structural schematic diagram of a two-dimensional equal acceleration and equal deceleration guide rail axial piston pump.

Figure 2 is an exploded view of the 2D coupling.

Figure 3 is a schematic diagram of the assembly of the piston, the slotted pin, and the cross pin.

Figure 4a is a schematic diagram of the piston.

Fig. 4b is a cross-sectional view of A-A in Fig. 4a.

Figure 5a is a schematic diagram of the cylinder.

Fig. 5b is a cross-sectional view of B-B in Fig. 5a.

Fig. 6a is a schematic diagram showing that the grooves e, f, g, and h on the piston do not communicate with the windows a, b, c, and d on the cylinder body when the piston moves to the far left.

Fig. 6b is a D-D sectional view in Fig. 6a.

Fig. 6c is a schematic diagram showing that the piston rotates and starts to move to the right end, and the grooves e, f, g, and h on the piston communicate with the windows a, d, b, and c on the cylinder respectively.

Fig. 6d is an E-E sectional view in Fig. 6c.

Fig. 6e is a schematic diagram showing that the grooves e, f, g, and h on the piston are no longer in communication with the windows a, b, c, and d on the cylinder when the piston moves to the far right.

Fig. 6f is a cross-sectional view of F-F in Fig. 6e.

Figure 7 is a schematic diagram of the left guide rail.

Figure 8 is a schematic diagram of the right guide rail

Figures 9a, 9b, and 9c are displacement diagrams of the left guide rail or the right guide rail.

Detailed ways

Referring to Figures 1 to 9c, a two-dimensional constant acceleration and constant deceleration guide rail axial piston pump includes a pump body 1, a cylinder body 2 and a piston 3, and the cylinder body 2 is placed in the pump body 1 and is fixedly connected to the pump body 1; the pump body 1 is provided with an oil suction and discharge hole and a leakage oil return channel. The left and right ends of the pump body 1 are respectively fixed with left and right end covers 5 and 6 through the retaining spring 4. The left and right ends of the cylinder body 2 are The left guide rail 7 and the right guide rail 8 with the same roller rolling surface are respectively fixed at the ends, and the left guide rail 7 and the right guide rail 8 are mutually staggered by 90 degrees, that is, the highest point and the lowest point of the left guide rail 7 are respectively connected with the right guide rail 8. The lowest point corresponds to the highest point;

The center of the inner chamber of the cylinder body 2 is provided with a piston 3, and the piston 3 can move linearly and reciprocatingly along the axial direction of the inner chamber of the cylinder body 2; There is a left plug ring 9 and a right plug ring 10 concentric with the piston 3, and the left plug ring 9 and the right plug ring 10 are respectively fixed on the cylinder body 2; The combined space constitutes the left chamber, and the space enclosed by the right plug ring, the right end of the piston and the cylinder constitutes the right chamber, and the volumes of the left chamber and the right chamber change alternately with the reciprocating motion of the piston; when the piston moves from When the piston moves axially from the extreme left to the extreme right, the volume of the left chamber gradually increases, and the volume of the right chamber gradually decreases; on the contrary, when the piston moves axially from the extreme right to the extreme left, the volume of the right chamber gradually increases, and the volume of the left chamber gradually decreases. The volume of the chamber gradually decreases;

The piston 3 is provided with a shoulder, and the surface of the shoulder is provided with four rectangular grooves e, f, g, h evenly arranged, and the positions of the notches of the four rectangular grooves are mutually staggered ; The corresponding positions of the cylinder body 2 are evenly distributed with two groups of windows a, c, b, and d corresponding to the four rectangular grooves, and the two groups of windows communicate with each other through the annular grooves opened on the surface of the cylinder body 2 ; During work, the rectangular groove on the piston 3 communicates with the window on the cylinder body, the chamber with gradually larger volume absorbs oil from the fuel tank through the communicating rectangular groove and window, and the chamber with gradually decreasing volume passes through the communicating groove Grooves and windows discharge the oil in the cavity;

The left end of described piston 3 is equipped with a word pin shaft 11, and the shaft end of described word pin shaft 11 is symmetrically installed with a group of left bearing large rollers 111, and the left end of described word pin shaft 11 is installed with a left end cover The fixedly connected roller cover 13, the said straight pin shaft 11 is fastened on the piston 3; the right end of the said piston 3 is equipped with a cross pin shaft 12, and the shaft ends of said cross pin shaft 12 are symmetrically installed with a A group of right bearing large rollers 121 and a group of bearing small rollers 122 for transmitting torque, the cross pin shaft 12 is fastened on the piston 3; the left bearing large rollers 111 and right bearing large rollers 121 are respectively arranged on On the left guide rail 7 and the right guide rail 8, and can roll along the left guide rail 7 and the right guide rail 8 respectively;

The cross pin shaft 12 is installed on the right end cover 6 with a through hole through the 2D coupling 14, the brushless motor 15 is too tightly matched with the 2D coupling 14, and the brushless motor 15 is passed through The 2D coupling 14 transmits the torque to the small bearing roller 122, which drives the small bearing roller 122 to rotate, thereby driving the cross pin 12, the piston 3 and the slotted pin 11 to rotate together. When the motor 15 drives the 2D coupling 14 to rotate, the 2D coupling 14 transmits the torque to the piston 3 through the small bearing roller 122 on the cross pin shaft 12, so that the piston 3 rotates, and the piston 3 rotates and reciprocates at the same time. Suction and discharge chamber switching and continuous suction and discharge.

The left guide rail 7 and the right guide rail 8 are cylinders, the top surface of the cylinder has outwardly convex curved surfaces 71, 81, and the cylinders at both ends of the lowest point of the curved surface Mounting holes 72, 82 matched with pins are arranged symmetrically; through holes 73, 83 matched with hexagon socket bolts are opened in the center of the cylinder.

The large right bearing roller 121 and the small bearing roller 122 are respectively arranged on the groove 141 of the 2D coupling 14; the 2D coupling 14 is installed on the On the right end cover 6 that has through hole.

The right end of the 2D coupling 14 is provided with a rectangular keyway matching with the brushless motor 15 .

A J-shaped frameless oil seal 18 and a copper sheet 19 are installed between the right end cover 6 and the 2D coupling 14 for sealing and reducing the friction between the coupling and the end cover.

The left bearing large roller 111, the right bearing large roller 121, and the bearing small roller 122 are respectively composed of a wheel sleeve 1212, a rolling bearing 1211, a second steel wire retaining ring 1214 and a lock washer 1213. At the end, the wheel sleeve is sleeved on the rolling bearing through the second steel wire retaining ring and the locking washer.

The left and right end caps 5 and 6 are provided with annular grooves for placing O-ring seals 20 .

The left and right plug rings 9 and 10 are respectively fixed on the cylinder body 2 through the third steel wire retaining ring 21 .

Said flat pin shaft 11 and cross pin shaft 12 are fastened to the left and right ends of the piston 3 by hexagon socket bolts 17 respectively.

It works as follows:

The piston, the cross pin shaft and the flat pin shaft are fixedly connected together by the hexagon socket head bolts, the brushless motor transmits the torque to the small bearing roller on the cross pin shaft through the 2D coupling, and drives the small bearing roller to rotate, and the right bearing large roller As the small roller of the bearing rotates with the 2D coupling, the large roller of the right bearing will also roll on the right guide rail. In the same way, the large roller of the left bearing will also roll on the inner guide rail while rotating on the left end flat pin. When the large roller of the left bearing rolls to the highest point of the left guide rail, that is, the large roller of the right bearing rolls to the lowest point of the right guide rail, and the piston moves axially to the leftmost end; when the large roller of the left bearing rolls to the lowest point of the left guide rail, that is The large roller of the right bearing rolls to the highest point of the right guide rail, and the piston axially moves to the far right. As the large roller of the left bearing and the large roller of the right bearing roll continuously on the left guide rail and the right guide rail respectively, the piston can be continuously reciprocated in the axial direction, realizing continuous reciprocation in the axial direction while the piston rotates continuously in the longitudinal direction sports.

In this embodiment, as shown in Figures 4a to 5b, the four rectangular grooves on the piston are respectively e, f, g, and h, and the positions of the slots are staggered from each other, that is, the slots of e, h and the slots of f, g in the opposite direction. The two groups of windows corresponding to the rectangular grooves on the cylinder body are a, c and b, d, and the windows of a, c and windows b, d communicate with each other through the annular grooves opened on the surface of the cylinder body.

As shown in Figures 6a to 6f, the piston rotates counterclockwise (viewed from left to right), a, b, c, and d are window channels on the cylinder body, a, c are oil suction channels, and b, d are oil discharge channels. e, f, g, h are rectangular grooves on the piston.

Figures 6a and 6b show that when the piston moves to the far left, the rectangular grooves e, f, g, and h on the piston do not communicate with the windows a, b, c, and d on the cylinder.

When the piston rotates, it begins to move to the right end, as shown in Figure 6c and 6d, the rectangular grooves e, f, g, h on the piston communicate with the windows a, d, b, c on the cylinder respectively, and the cavity gradually The enlarged left chamber absorbs oil from the oil tank through the communication channels e-a, h-c due to self-priming; the gradually smaller volume of the right chamber squeezes out the oil in the chamber through the communication channels f-d, g-b.

As shown in Figures 6e and 6f, when the piston moves to the far right, the rectangular grooves e, f, g, and h on the piston are no longer in communication with the windows a, b, c, and d on the cylinder. When the piston continues to rotate, the piston starts to move to the left, and the right chamber starts to absorb oil from the fuel tank through the communication channels f-a, g-c; the left chamber squeezes out the oil through the communication channels e-b, h-d.

The content described in the embodiments of this specification is only an enumeration of the implementation forms of the inventive concept, and the protection scope of the present utility model should not be regarded as limited to the specific forms stated in the embodiments, and the protection scope of the present utility model also extends to this invention. Equivalent technical means that those skilled in the art can think of according to the concept of the utility model.

Claims (9)

1. two dimension etc. such as to add at the deceleration guide rail axial piston pump, and comprise the pump housing, cylinder body and piston, cylinder body is placed in the pump housing and is fixedly connected with the pump housing; The pump housing have suction oilhole and reveal oily drainback passage, the left and right two ends of the pump housing are installed with left and right end cap respectively by jump ring, it is characterized in that: the left and right two ends of described cylinder body are installed with the left rail and right guide rail with the identical roller surface of rolling respectively, and left rail and right guide rail are staggeredly arranged in 90 degree mutually, namely the highs and lows of left rail is corresponding with the minimum point of right guide rail and peak respectively;

The lumen centers of described cylinder body is provided with piston, and described piston can do straight reciprocating motion along the axis of inner chamber of cylinder block; Be separately installed with the left plug ring concentric with piston and right plug ring at the left and right two ends of described piston, described left plug ring, right plug ring are separately fixed on cylinder body; Space that described left plug ring, piston left end and cylinder body enclose jointly forms left chamber, and the space that described right plug ring, piston right-hand member and cylinder body enclose jointly forms right chamber, and the volume of left chamber and right chamber interlocks with the to-and-fro motion of piston and changes; When piston is from high order end toward low order end axial motion, left chamber's volume becomes large gradually, and right cavity volume diminishes gradually; On the contrary, when piston is from low order end toward high order end axial motion, right cavity volume becomes large gradually, and left chamber's volume diminishes gradually;

Described piston is provided with shoulder, the surface of described shoulder offers four rectangle grooves be evenly arranged, and the notch position of four rectangle grooves is staggeredly arranged; The corresponding position of described cylinder body is evenly distributed with two group windows corresponding with four rectangle grooves, and two group windows are mutually through by opening at the circular groove of cylinder surface; During work, the rectangle groove on piston and the window on cylinder body are linked up, and volume becomes large chamber gradually by the rectangle groove of linking up and window from fuel tank oil suction, and chamber inner fluid is discharged by the groove of linking up and window by the chamber that volume reduces gradually;

The left end of described piston is provided with one shape pin axle, and the axle head of described one shape pin axle is symmetrically installed with one group of left bearing big roller, and the left end of described one shape pin axle is provided with a roller cover be fixedly connected with left end cap, and described one shape pin axle is fastened on piston; The right-hand member of described piston is provided with cross bearing pin, and the axle head of described cross bearing pin is symmetrically installed with one group of right bearing big roller and one group of bearing trundle for transmitting torque respectively, and described cross bearing pin is fastened on piston; Described left bearing big roller and right bearing big roller are separately positioned on described left rail and right guide rail, and can roll along left rail and right guide rail respectively;

Described cross bearing pin is arranged on by 2D coupling and has on the right end cap of through hole, drive fit crossed by brushless electric machine and described 2D coupling, described brushless electric machine transfers torque to bearing trundle by 2D coupling, band dynamic bearing trundle rotates, thus drive cross bearing pin, piston rotate together with one shape pin axle.

2. two dimension as claimed in claim 1 etc. such as to add at the deceleration guide rail axial piston pump, it is characterized in that: described left rail and right guide rail are all in cylindrical body, described cylindrical end face has the arc-shaped curved surface concaved, and the cylindrical body at the minimum point two ends of described arc-shaped curved surface is symmetrically arranged with the mounting hole matched with pin; Described cylindrical center offers the through hole mated with hexagon socket head cap screw.

3. two dimension as claimed in claim 2 etc. such as to add at the deceleration guide rail axial piston pump, it is characterized in that: described right bearing big roller and bearing trundle are separately positioned on the groove of 2D coupling; Described 2D coupling is arranged on by the first Steel Cable Baffle Ring and lock washer and has on the right end cap of through hole.

4. two dimension as claimed in claim 3 etc. such as to add at the deceleration guide rail axial piston pump, it is characterized in that: the right-hand member of described 2D coupling has the rectangle keyway coordinated with brushless electric machine.

5. two dimension as claimed in claim 4 etc. such as to add at the deceleration guide rail axial piston pump, it is characterized in that: install the J-shaped oil seal without framework of frictional force effect and the copper sheet for sealing and reduce coupling and end cap between described right end cap and 2D coupling.

6. the deceleration guide rail axial piston pumps such as the two dimension as described in one of Claims 1 to 5 etc. add, it is characterized in that: described left bearing big roller, right bearing big roller, bearing trundle are made up of wheel case, rolling bearing, the second Steel Cable Baffle Ring and lock washer respectively, described rolling bearing is set on axle head, and described wheel case is set on rolling bearing by the second Steel Cable Baffle Ring and lock washer.

7. two dimension as claimed in claim 6 etc. such as to add at the deceleration guide rail axial piston pump, it is characterized in that: described left and right end cap offers the circular groove for placing O-ring seals.

8. two dimension as claimed in claim 7 etc. such as to add at the deceleration guide rail axial piston pump, it is characterized in that: described left plug ring, right plug ring are fixed on cylinder body respectively by the 3rd Steel Cable Baffle Ring.

9. two dimension as claimed in claim 8 etc. such as to add at the deceleration guide rail axial piston pump, it is characterized in that: described one shape pin axle, cross bearing pin are fastened on the left and right end of piston respectively by hexagon socket head cap screw.