阅读说明：本技术 一种辊 (Roller ) 是由 张婷 于 2019-09-27 设计创作，主要内容包括：本发明公开了一种辊,包括有管状的辊本体,辊本体两端设有轴承；所述轴承包括内圈、外圈、支承体、挤压轨道和泵油机构,支承体包括保持架、保持盖环和滚动体,滚动体设有中心通孔和分散孔,挤压轨道设有倾斜面结构,泵油机构包括泵油环、油泵封盖、第一单向弹性活塞和第二单向弹性活塞分别对应设于每个活塞腔室内,且第一单向弹性活塞与第二单向弹性活塞相互间隔分布；本发明可以实现循环对滚动体、内圈和外圈进行冷却和润滑,无需人工临时添加润滑油,省时省力,节约成本,且润滑油不会散落,更环保。(The invention discloses a roller, which comprises a tubular roller body, wherein bearings are arranged at two ends of the roller body; the bearing comprises an inner ring, an outer ring, a supporting body, an extrusion track and an oil pumping mechanism, wherein the supporting body comprises a retainer, a retaining cover ring and a rolling body, the rolling body is provided with a central through hole and a dispersion hole, the extrusion track is provided with an inclined surface structure, the oil pumping mechanism comprises an oil pumping ring, an oil pump sealing cover, a first one-way elastic piston and a second one-way elastic piston which are respectively and correspondingly arranged in each piston cavity, and the first one-way elastic piston and the second one-way elastic piston are mutually distributed at intervals; the invention can realize the cooling and lubrication of the rolling body, the inner ring and the outer ring in a circulating way, does not need to add lubricating oil temporarily, saves time and labor, saves cost, can not scatter lubricating oil, and is more environment-friendly.)

1. A roller is characterized by comprising a tubular roller body, wherein bearings are arranged at two ends of the roller body.

2. A roll according to claim 1, characterized in that the bearing (b) comprises an inner ring (1), an outer ring (2), a support body (3), two extrusion tracks (4) symmetrically arranged on both sides of the outer ring (2), and two oil pumping mechanisms (5) symmetrically arranged on both sides of the support body (3), respectively;

the supporting body (3) is arranged between the inner ring (1) and the outer ring (2), the supporting body (3) comprises a retainer (31), a retainer cover ring (32) and a plurality of rolling bodies (33), the plurality of rolling bodies (33) are respectively embedded in the retainer (31) at equal intervals, the retainer cover ring (32) is fixed on one side of the retainer (31) to enable the plurality of rolling bodies (33) to be movably limited in the retainer (31), the outer ring walls of the plurality of rolling bodies (33) are respectively abutted between the inner ring (1) and the outer ring (2), the rolling bodies (33) are provided with a central through hole (331) and a plurality of dispersion holes (332) communicated with the central through hole (331), and the retainer (31) and the retainer cover ring (32) are respectively provided with first through holes communicated with the central through hole (331) corresponding to each rolling body (33), the retainer (31) is in sealing fit with the inner ring (1) and the outer ring (2) respectively, and the retaining cover ring (32) is in sealing fit with the inner ring (1) and the outer ring (2) respectively;

one side of each of the two extrusion tracks (4) is correspondingly fixed on two sides of the outer ring (2), the other side of each of the two extrusion tracks (4) is of an inclined surface structure, and the two extrusion tracks (4) are correspondingly coated with the two oil pumping mechanisms (5) respectively;

the oil pumping mechanism (5) comprises an oil pumping ring (51), an oil pumping sealing cover (52), a plurality of first one-way elastic pistons (53) and a plurality of second one-way elastic pistons (54), wherein the oil pumping ring (51) is provided with a circular ring groove (511) and a plurality of cylindrical grooves (512) which are arranged at equal intervals corresponding to each first one-way elastic piston (53) and each second one-way elastic piston (54), the oil pumping sealing cover (52) covers the oil pumping ring (51) and is respectively formed with the circular ring groove (511) and the plurality of cylindrical grooves (512) to form an oil storage chamber (M) and a plurality of piston chambers (N), the plurality of first one-way elastic pistons (53) and the plurality of second one-way elastic pistons (54) are respectively and correspondingly arranged in each piston chamber (N), and the first one-way elastic pistons (53) and the second one-way elastic pistons (54) are mutually distributed at intervals, the first one-way elastic piston (53) or the second one-way elastic piston (54) divides the piston chamber (N) into an upper chamber and a lower chamber, the valve core of the first one-way elastic piston (53) is positioned in the lower cavity, the valve core of the second one-way elastic piston (54) is positioned in the upper cavity, a second through hole (513) is arranged on the pump oil ring (51) corresponding to each piston chamber (N), the second via hole (513) communicates the upper chamber and the oil storage chamber (M), one end of the first one-way elastic piston (53) or the second one-way elastic piston (54) passes through the oil pump sealing cover (52) and then abuts against the other side of the extrusion track (4), the oil pumping ring (51) is provided with an oil hole (514) corresponding to each piston chamber (N), the oilhole (514) and the cavity of resorption intercommunication, oilhole (514) stretch into in the first through-hole.

3. A roller according to claim 1, characterized in that the first one-way elastic piston (53) comprises a first piston disc (531), a first piston rod (532), a first return spring (533), a first contact head (534), a first one-way valve core (535) and a second return spring (536), the first piston disc (531) is provided with a first piston port, one end of the first piston rod (532) movably passes through the oil pump cover (52), the first contact head (534) is fixed at one end of the first piston rod (532) and abuts against the extrusion track (4), the other end of the first piston rod (532) is fixedly connected to the first piston disc (531), the first return spring (533) is sleeved on the first piston rod (532), and the two ends of the first return spring (533) respectively abut against the first contact head (534) and the oil pump cover (52), the oil pump sealing cover is characterized in that a first blind hole is formed in the first piston disc (531), the first blind hole extends into the first piston rod (532), one end of the first one-way valve core (535) movably extends into the first blind hole, the first one-way valve core (535) is located on one side, away from the oil pump sealing cover (52), of the first piston disc (531), the second return spring (536) is arranged in the first blind hole, and two ends of the second return spring (536) are connected to the first piston rod (532) and the first one-way valve core (535) respectively.

4. The roller of claim 1, wherein the second unidirectional elastic piston (54) comprises a second piston disc (541), a second piston rod (542), a third return spring (543), a second contact head (544), a second one-way valve core (545) and a fourth return spring (546), the second piston disc (541) is provided with a second piston port, one end of the second piston rod (542) movably penetrates through the oil pump cover (52), the second contact head (544) is fixed at one end of the second piston rod (542) and abuts against the extrusion track (4), the other end of the second piston rod (542) is fixedly connected to the second piston disc (541), the third return spring (543) is sleeved on the second piston rod (542), and two ends of the third return spring (543) respectively abut against the second contact head (544) and the oil pump cover (52), the second one-way valve core (545) is sleeved at the other end of the second piston rod (542), the second one-way valve core (545) is positioned on one side, close to the oil pump sealing cover (52), of the second piston disc (541), a limiting boss (5421) is further arranged at the other end of the second piston rod (542), the fourth return spring (546) is sleeved at the other end of the second piston rod (542), and two ends of the fourth return spring are respectively abutted against the limiting boss (5421) and the second one-way valve core (545).

5. A roll according to claim 1, characterized in that the cage (31) and the retaining cover ring (32) are each in sealing engagement with the inner ring (1) and the outer ring (2), respectively, by means of a sealing ring (34).

Technical Field

The present invention relates to a roller.

Background

The existing lubrication and cooling of the bearing are usually performed by temporarily adding lubricating oil manually, which wastes time and labor, and the lubricating oil can scatter everywhere to pollute the working environment.

Disclosure of Invention

The object of the present invention is to overcome the above-mentioned drawbacks and to provide a roller.

In order to achieve the purpose, the invention adopts the following specific scheme:

a roller comprises a tubular roller body, wherein bearings are arranged at two ends of the roller body.

The bearing comprises an inner ring, an outer ring, a supporting body, two extrusion tracks symmetrically arranged on two sides of the outer ring and two oil pumping mechanisms symmetrically arranged on two sides of the supporting body respectively;

the bearing body is arranged between the inner ring and the outer ring and comprises a retainer, a retaining cover ring and a plurality of rolling bodies, the plurality of rolling bodies are respectively embedded in the retainer at equal intervals, the retaining cover ring is fixed on one side of the retainer to enable the plurality of rolling bodies to be movably limited in the retainer, the outer ring walls of the plurality of rolling bodies are respectively abutted between the inner ring and the outer ring, the rolling bodies are provided with a central through hole and a plurality of dispersion holes communicated with the central through hole, first through holes communicated with the central through hole are respectively arranged on the retainer and the retaining cover ring corresponding to each rolling body, the retainer is respectively in sealing fit with the inner ring and the outer ring, and the retaining cover ring is respectively in sealing fit with the inner ring and the outer ring;

one side of each of the two extrusion tracks is correspondingly fixed on two sides of the outer ring, the other side of each of the two extrusion tracks is of an inclined surface structure, and the two extrusion tracks are correspondingly coated with the two oil pumping mechanisms respectively;

the oil pumping mechanism comprises an oil pumping ring, an oil pump sealing cover, a plurality of first one-way elastic pistons and a plurality of second one-way elastic pistons, wherein the oil pumping ring is provided with a circular ring groove and a plurality of cylinder grooves which are arranged at equal intervals corresponding to each first one-way elastic piston and each second one-way elastic piston, the oil pump sealing cover is covered on the oil pumping ring and is respectively formed with an oil storage chamber and a plurality of piston chambers corresponding to the circular ring groove and the plurality of cylinder grooves, the plurality of first one-way elastic pistons and the plurality of second one-way elastic pistons are respectively arranged in each piston chamber correspondingly, the first one-way elastic pistons and the second one-way elastic pistons are mutually distributed at intervals, the piston chambers are separated into an upper chamber and a lower chamber by the first one-way elastic pistons or the second one-way elastic pistons, and the valve core of the first one-way elastic pistons is positioned in the lower chamber, the case of the one-way elastic piston of second is located go up the intracavity, correspond every on the pump oil ring the piston cavity is equipped with the second via hole, second via hole intercommunication the epicoele with the oil storage cavity, the one end of the one-way elastic piston of first one-way elastic piston or second is passed behind the oil pump closing cap with the orbital opposite side butt of extrusion, the pump oil ring corresponds every the piston cavity is equipped with the oilhole, oilhole and cavity of resorption intercommunication, the oilhole stretches into in the first mistake is downthehole.

Wherein the first one-way elastic piston comprises a first piston disc, a first piston rod, a first reset spring, a first contact head, a first one-way valve core and a second reset spring, the first piston disc is provided with a first piston port, one end of the first piston rod movably penetrates through the oil pump seal cover, the first contact head is fixed at one end of the first piston rod and is abutted against the extrusion track, the other end of the first piston rod is fixedly connected to the first piston disc, the first reset spring is sleeved on the first piston rod, two ends of the first reset spring are respectively abutted against the first contact head and the oil pump seal cover, the first piston disc is provided with a first blind hole, the first blind hole extends into the first piston rod, one end of the first one-way valve core movably extends into the first blind hole, and the first one-way valve core is positioned at one side of the first piston disc far away from the oil pump seal cover, the second reset spring is arranged in the first blind hole, and two ends of the second reset spring are respectively connected to the first piston rod and the first one-way valve core.

Wherein the second unidirectional elastic piston comprises a second piston disc, a second piston rod, a third return spring, a second contact head, a second unidirectional valve core and a fourth return spring, the second piston disc is provided with a second piston port, one end of the second piston rod movably penetrates through the oil pump sealing cover, the second contact head is fixed at one end of the second piston rod and is abutted against the extrusion track, the other end of the second piston rod is fixedly connected to the second piston disc, the third return spring is sleeved on the second piston rod, two ends of the third return spring are respectively abutted against the second contact head and the oil pump sealing cover, the second unidirectional valve core is sleeved at the other end of the second piston rod, the second unidirectional valve core is positioned at one side of the second piston disc close to the oil pump sealing cover, the other end of the second piston rod is also provided with a limit boss, and the fourth return spring is sleeved at the other end of the second piston rod, and two ends of the first check valve core are respectively propped against the limiting lug boss and the second check valve core.

The retainer and the retaining cover ring are respectively in sealing fit with the inner ring and the outer ring through sealing rings.

The invention has the beneficial effects that: compared with the prior art, the two oil pumping mechanisms are symmetrically arranged on two sides of the supporting body, the first one-way elastic piston and the second one-way elastic piston are distributed on each oil pumping mechanism at intervals, and then the oil pumping mechanisms can be in an oil pumping state and an oil absorption state simultaneously under the matching of the inclined plane structure of the extrusion track, so that the balance of lubricating oil in the oil storage cavity can be ensured, the rolling body, the inner ring and the outer ring can be cooled and lubricated circularly, the lubricating oil does not need to be added manually temporarily, time and labor are saved, the cost is saved, and the lubricating oil cannot scatter and is more environment-friendly.

Drawings

FIG. 1 is a schematic structural diagram of a bearing provided by an embodiment of the present invention;

FIG. 2 is an exploded schematic view of a bearing provided by an embodiment of the present invention;

FIG. 3 is a top view of a bearing provided by an embodiment of the present invention;

FIG. 4 is a cross-sectional view taken along A-A of FIG. 3;

FIG. 5 is a cross-sectional view taken along line B-B of FIG. 3;

FIG. 6 is a schematic structural diagram of an oil pumping mechanism provided in an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of another perspective of an oil pumping mechanism provided in an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a first unidirectional resilient piston provided in accordance with an embodiment of the present invention;

FIG. 9 is a cross-sectional view of a first unidirectional resilient piston provided in accordance with an embodiment of the present invention;

FIG. 10 is a schematic structural view of a second unidirectional resilient piston provided in accordance with an embodiment of the present invention;

FIG. 11 is a cross-sectional view of a second unidirectional resilient piston provided in accordance with an embodiment of the present invention;

FIG. 12 is a schematic structural view of a pump oil ring provided in an embodiment of the present invention;

FIG. 13 is a schematic structural view of another perspective of an oil ring for a pump according to an embodiment of the present invention;

FIG. 14 is a schematic structural view of a support provided in accordance with an embodiment of the present invention;

FIG. 15 is an exploded view of a support provided in accordance with an embodiment of the present invention;

FIG. 16 is a schematic structural view of a rolling element provided in an embodiment of the present invention;

FIG. 17 is a schematic structural diagram of a cage according to an embodiment of the present invention;

FIG. 18 is a schematic structural diagram of an extrusion track provided in accordance with an embodiment of the present invention;

description of reference numerals: 1-inner ring; 2-outer ring; 3-a support; 31-a cage; 32-a retaining cover ring; 33-rolling elements; 331-central through hole; 332-discrete holes; 34-a sealing ring; 4-extruding the rail; 5-oil pumping mechanism; 51-pump oil ring; 511-circular groove; 512-cylindrical grooves; 513 — a second via; 514-oil hole; 52-oil pump cover; 53-a first unidirectional elastomeric piston; 531-first piston disc; 532-a first piston rod; 533-a first return spring; 534-first contact; 535-first one-way valve core; 536-a second return spring; 54-a second unidirectional resilient piston; 541-a second piston disc; 542-a second piston rod; 5421-limit boss; 543-a third return spring; 544-a second contact; 545-a second one-way valve spool; 546-a fourth return spring; m-an oil storage chamber; an N-piston chamber.

Detailed Description

The invention will be described in further detail with reference to the following figures and specific examples, without limiting the scope of the invention. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

As shown in fig. 1 to 18, the roller according to the present embodiment includes a tubular roller body, and bearings are disposed at two ends of the roller body.

The bearing comprises an inner ring 1, an outer ring 2, a supporting body 3, two extrusion tracks 4 symmetrically arranged on two sides of the outer ring 2 and two oil pumping mechanisms 5 symmetrically arranged on two sides of the supporting body 3 respectively; the support body 3 is arranged between the inner ring 1 and the outer ring 2, the support body 3 comprises a retainer 31, a retainer cover ring 32 and a plurality of rolling bodies 33, the plurality of rolling bodies 33 are respectively embedded in the retainer 31 at equal intervals, the retainer cover ring 32 is fixed to one side of the retainer 31 so that the plurality of rolling elements 33 are movably restricted in the retainer 31, outer circumferential walls of the plurality of rolling elements 33 are respectively abutted between the inner ring 1 and the outer ring 2, the rolling body 33 is provided with a central through hole 331 and a plurality of dispersion holes 332 communicating with the central through hole 331, the retainer 31 and the retainer cover ring 32 are respectively provided with a first through hole corresponding to each rolling body 33 and communicated with a central through hole 331, the retainer 31 is in sealing fit with the inner ring 1 and the outer ring 2 respectively, and the retaining cover ring 32 is in sealing fit with the inner ring 1 and the outer ring 2 respectively; one side of each of the two extrusion tracks 4 is correspondingly fixed on two sides of the outer ring 2, the other side of each of the two extrusion tracks 4 is of an inclined surface structure, and the two extrusion tracks 4 are correspondingly coated with the two oil pumping mechanisms 5; the oil pumping mechanism 5 comprises an oil pumping ring 51, an oil pump sealing cover 52, a plurality of first one-way elastic pistons 53 and a plurality of second one-way elastic pistons 54, wherein the oil pumping ring 51 is provided with a circular ring groove 511 and a plurality of cylindrical grooves 512 which are arranged corresponding to each first one-way elastic piston 53 and each second one-way elastic piston 54 at equal intervals, the oil pump sealing cover 52 covers the oil pumping ring 51 and forms an oil storage chamber M and a plurality of piston chambers N with the circular ring groove 511 and the plurality of cylindrical grooves 512 respectively, a plurality of first one-way elastic pistons 53 and a plurality of second one-way elastic pistons 54 are arranged in each piston chamber N respectively, the first one-way elastic pistons 53 and the second one-way elastic pistons 54 are distributed at intervals, the first one-way elastic pistons 53 or the second one-way elastic pistons 54 divide the piston chambers N into an upper cavity and a lower cavity, the case of first one-way elastic piston 53 is located the intracavity down, the case of second one-way elastic piston 54 is located go up the intracavity, correspond every on the pump oil ring 51 piston chamber N is equipped with second via hole 513, second via hole 513 intercommunication the epicoele with oil storage chamber M, the one end of first one-way elastic piston 53 or second one-way elastic piston 54 is passed behind the oil pump closing cap 52 with the opposite side butt of extrusion track 4, pump oil ring 51 corresponds every piston chamber N is equipped with oilhole 514, oilhole 514 and inferior cavity intercommunication, oilhole 514 stretches into in the first via hole.

Specifically, the number of the rolling bodies 33 is 12, correspondingly, the number of the piston chambers N in each oil pumping mechanism 5 is 12, the number of the first unidirectional elastic piston 53 and the second unidirectional elastic piston 54 is 6, 6 first unidirectional elastic pistons 53 and 6 second unidirectional elastic pistons 54 are respectively placed in the 12 piston chambers N, the first unidirectional elastic piston 53 and the second unidirectional elastic piston 54 are arranged at intervals, and the other sides of the two pressing rails 4 are both arranged in an inclined surface structure, so that the other side of each pressing rail 4 is formed with a lower end portion and a higher end portion, the height from the lower end portion to the higher end portion is gradually increased, the 12 rolling bodies 33 are embedded in the retainer 31, then the retainer cover ring 32 is covered on the retainer 31, the rolling bodies 33 are limited in the retainer 31 and can rotate relative to the retainer 31, and the lubricating oil is injected into the oil storage chamber M, when the piston is used, the support body 3 rotates relative to the outer ring 2, that is, the retainer 31 drives the rolling body 33 to make revolution motion around the central axis of the inner ring 1, the rolling body 33 rotates under the action of the inner ring 1 and the outer ring 2, the support body 3 drives the oil pumping mechanisms 5 on both sides to rotate, at this time, the oil pumping ring 51 drives the oil pumping sealing cover 52, the 6 first one-way elastic pistons 53 and the 6 second one-way elastic pistons 54 to rotate, because the 6 first one-way elastic pistons 53 and the 6 second one-way elastic pistons 54 are respectively abutted against the extrusion track 4, and the other side of the extrusion track 4 is an inclined surface structure, when the first one-way elastic piston 53 or the second one-way elastic piston 54 is contacted with the lower end part of the extrusion track 4, the first one-way elastic piston 53 or the second one-way elastic piston 54 moves towards the lower cavity of the piston chamber N, at this time, the, the first unidirectional elastic piston 53 is in a closed state, and the second unidirectional elastic piston 54 is in an open state; however, when the first one-way elastic piston 53 or the second one-way elastic piston 54 is in contact with the high end portion of the pressing rail 4, the first one-way elastic piston 53 or the second one-way elastic piston 54 moves toward the upper chamber of the piston chamber N, and at this time, the pressure of the upper chamber in the piston chamber N increases, the first one-way elastic piston 53 is in an open state, and the second one-way elastic piston 54 is in a closed state; when the extrusion rail 4 rotates, the first unidirectional elastic piston 53 and the second unidirectional elastic piston 54 are distributed at intervals, that is, the first unidirectional elastic piston 53 and the second unidirectional elastic piston 54 are alternately arranged, so that the first unidirectional elastic piston 53 and the second unidirectional elastic piston 54 alternately pass through the high end part and the low end part of the extrusion rail 4;

therefore, when the first unidirectional elastic piston 53 passes through the high end portion of the extrusion track 4, the pressure of the upper chamber in the piston chamber N is higher than that of the lower chamber, the lubricating oil in the oil storage chambers M on both sides enters the upper chamber through the second through hole 513, then enters the lower chamber through the first unidirectional elastic piston 53 from the upper chamber, then flows into the central through hole 331 through the oil hole 514 and the first through hole from the lower chamber, and then flows into each dispersion hole 332 from the central through hole 331, thereby cooling and cooling the rolling element 33, meanwhile, the lubricating oil flowing out of the dispersion holes 332 contacts with the inner ring 1 and the outer ring 2, thereby cooling and lubricating the inner ring 1 and the outer ring 2, then the adjacent second unidirectional elastic piston 54 passes through the high end portion of the extrusion track 4, the second unidirectional elastic piston 54 is in a closed state, the lubricating oil does not pass through the second unidirectional elastic piston 54, then, along with the rotation of the inner ring 1, the first one-way elastic piston 53 moves to the lower end portion of the extrusion track 4 to contact, at this time, the first one-way elastic piston 53 is in the closed state, that is, the first one-way elastic piston 53 moves from the high end portion to the lower end portion of the extrusion track 4, the first one-way elastic piston 53 gradually changes from the open state to the closed state, next, the adjacent second one-way elastic piston 54 moves to contact with the lower end portion of the extrusion track 4, at this time, the second one-way elastic piston 54 gradually changes from the closed state to the open state, the pressure of the lower cavity of the piston cavity N is strong, so that the lubricating oil flowing between the inner ring 1 and the outer ring 2 and the previous rolling body 33 is sucked back into the oil storage cavity M through the second one-way elastic piston 54 under the action of air pressure, and the circulation is such that 6 first one-way elastic pistons 53 respectively and sequentially pump and lubricate into the corresponding rolling bodies 33 and between the inner When the 6 second unidirectional elastic pistons 54 respectively and sequentially contact the lower end part of the extrusion track 4, the lubricating oil pumped by the previous first unidirectional elastic piston 53 is sucked back into the oil storage chamber M, so that the balance of the lubricating oil in the oil storage chambers M on the two sides can be kept;

in summary, when the first one-way elastic piston 53 presses the high end portion of the raceway 4, the oil reservoir chamber M pumps oil from both ends of the rolling elements 33, and when the second one-way elastic piston 54 presses the low end portion of the raceway 4, the oil reservoir chamber M draws oil from both ends of the rolling elements 33, thereby cyclically cooling and lubricating the rolling elements 33, the inner ring 1, and the outer ring 2.

This embodiment sets up two pump oil mechanisms 5 through the bilateral symmetry at support body 3, interval distribution first one-way elastic piston 53 and the one-way elastic piston 54 of second on every pump oil mechanism 5, then under the inclined plane structure cooperation of extrusion track 4, make pump oil mechanism 5 can be in pump oil and oil absorption state simultaneously, thereby can guarantee the balance of lubricating oil in the oil storage cavity M, and then can circulate rolling element 33, inner circle 1 and outer lane 2 cool off and lubricate, need not artifical interim additional lubricating oil, time saving and labor saving, and the cost is saved, and lubricating oil can not scatter, and is more environment-friendly.

Based on the above embodiments, as shown in fig. 9 and 10, the first unidirectional elastic piston 53 includes a first piston disc 531, a first piston rod 532, a first return spring 533, a first contact 534, a first unidirectional valve core 535, and a second return spring 536, the first piston disc 531 is provided with a first piston port, one end of the first piston rod 532 movably passes through the oil pump cover 52, the first contact 534 is fixed at one end of the first piston rod 532 and abuts against the extrusion rail 4, the other end of the first piston rod 532 is fixedly connected to the first piston disc 531, the first return spring 533 is sleeved on the first piston rod 532, two ends of the first return spring 533 abut against the first contact 534 and the oil pump cover 52, the first piston disc 531 is provided with a first blind hole, the first blind hole extends into the first piston rod 532, one end of the first check valve spool 535 movably extends into the first blind hole, the first check valve spool 535 is located on one side of the first piston disc 531 away from the oil pump cover 52, the second return spring 536 is located in the first blind hole, and two ends of the second return spring 536 are respectively connected to the first piston rod 532 and the first check valve spool 535. Specifically, the first contact head 534 contacts with the inclined surface structure of the extrusion rail 4, when contacting with the lower end portion of the extrusion rail 4, the extrusion rail 4 presses down the first piston rod 532, the first return spring 533 is in a compressed state, the lower cavity pressure of the piston cavity N is high, and presses against the first check valve plug 535, and the first check valve plug 535 is in a closed state; when the piston moves to contact with the high end part of the extrusion track 4, the first piston rod 532 gradually resets under the action of the first reset spring 533, the pressure of the lower cavity of the piston cavity N is small, the first check valve core 535 extends out towards the lower cavity of the piston cavity N so as to open the first piston port, the upper cavity and the lower cavity of the piston cavity N are communicated, the lubricating oil enters the piston cavity N under the action of air pressure, and under the action of the second reset spring 536, the first check valve core 535 gradually resets so as to close the first piston port again.

Based on the above embodiments, as shown in fig. 11 and 12, the second unidirectional elastic piston 54 includes a second piston plate 541, a second piston rod 542, a third return spring 543, a second contact head 544, a second unidirectional valve core 545 and a fourth return spring 546, the second piston plate 541 is provided with a second piston port, one end of the second piston rod 542 movably penetrates through the oil pump cover 52, the second contact head 544 is fixed at one end of the second piston rod 542 and abuts against the pressing rail 4, the other end of the second piston rod 542 is fixedly connected to the second piston plate 541, the third return spring 543 is sleeved on the second piston rod 542, two ends of the third return spring 543 respectively abut against the second contact head 544 and the oil pump cover 52, the second unidirectional valve core 545 is sleeved at the other end of the second piston rod 542, the second unidirectional valve core 545 is located at one side of the second piston plate 541 close to the oil pump cover 52, the other end of the second piston rod 542 is further provided with a limit boss 5421, the fourth return spring 546 is sleeved at the other end of the second piston rod 542, and two ends of the fourth return spring are respectively abutted against the limit boss 5421 and the second check valve core 545. Specifically, the second contact head 544 is in contact with the inclined surface structure of the extrusion rail 4, when the second contact head is in contact with the lower end portion of the extrusion rail 4, the extrusion rail 4 may press down the second piston rod 542, the third return spring 543 is in a compressed state, the pressure of the lower cavity of the piston chamber N is high, and the second one-way valve core 545 may be pressed, so that the second one-way valve core 545 extends towards the upper cavity of the piston chamber N, thereby opening the second piston port, communicating the upper cavity and the lower cavity of the piston chamber N, and then under the action of air pressure, the lubricating oil is sucked back into the oil storage chamber M; when the piston moves to contact with the high end of the pressing rail 4, the first piston rod 532 is gradually reset under the action of the third reset spring 543, the pressure of the lower cavity of the piston chamber N is low, the second check valve core 545 is reset under the action of the fourth reset spring 546, and moves towards the lower cavity of the piston chamber N under the action of air pressure, so that the second piston port is closed.

Based on the above embodiments, as shown in fig. 15 and 16, the retainer 31 and the retainer cover ring 32 are respectively in sealing fit with the inner ring 1 and the outer ring 2 through the seal ring 34, so that the structure is more reliable, the overflow of the lubricating oil is avoided, and the lower cavity of the piston chamber N is communicated with the central through hole 331 and the dispersion holes 332 of the rolling element 33, and the seal ring 34 is arranged, so that the sealing performance of the lower cavity of the piston chamber N can be effectively guaranteed.

The above description is only a preferred embodiment of the present invention, and all equivalent changes or modifications of the structure, characteristics and principles described in the present patent application are included in the protection scope of the present patent application.