Mechanical-hydraulic coupling torque limiter

Abstract

The invention provides a mechanical-hydraulic coupling torque limiter. The mechanical-hydraulic coupling torque limiter comprises an internal spline mounting seat, a first internal spline is arranged on the inner wall of the internal spline mounting seat, a plurality of first threaded holes are formed in one side of the internal spline mounting seat, a bearing mounting surface is arranged on the outer wall of the internal spline mounting seat, and a plurality of second threaded holes are formed in the other side of the internal spline mounting seat. A plurality of ball seat mounting holes are respectively formed in the outer wall of the internal spline mounting seat, an ejector pin seat is arranged on one side of the internal spline mounting seat, a bearing mounting hole is formed in the ejector pin seat, a roller bearing matched with the bearing mounting hole is fixedly arranged on the bearing mounting surface in a sleeving manner, and the outer wall of the roller bearing is fixedly connected with the inner wall of the bearing mounting hole. The mechanical-hydraulic coupling torque limiter has the advantages of being simple and reliable in structure, free of oil injection, environmentally friendly, safe, stable and adaptive in torque, high in precision and torque grade, convenient to reset, wide in torque adjusting range and convenient to maintain.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of torque limiter, and particularly relates to a machine-fluid coupling torque limiter. BACKGROUND

[0002] The torque limiter is a device with overload protection and quick reset, and common torque limiter structures include a needle type mechanical structure, a hydraulic expansion type hydraulic structure, and an electromagnetic structure. The mechanical structure has the advantages of strong environmental applicability and stable torque; the hydraulic structure has the advantages of compact structure and high power density; and the electromagnetic structure has the advantages of high precision and easy control.

[0003] However, the bearing upper limit of the pure mechanical and electromagnetic structure is lower than that of the hydraulic structure, and the hydraulic structure has the disadvantage of oil injection pollution.

[0004] Therefore, it is necessary to provide a new machine-fluid coupling torque limiter to solve the above technical problems. SUMMARY

[0005] The technical problem solved by the application is to provide a machine-fluid coupling torque limiter with the advantages of simple and reliable structure, no oil injection, environmental protection safety, stable torque, high precision and torque level, convenient reset, wide torque adjustment range, and convenient maintenance.

[0006] To solve the above technical problems, the machine-fluid coupling torque limiter provided by the application comprises an inner spline mounting seat, an inner spline one is arranged on the inner wall of the inner spline mounting seat, a plurality of threaded holes one are formed in one side of the inner spline mounting seat, a bearing mounting surface is arranged on the outer wall of the inner spline mounting seat, and a plurality of ball seat mounting holes are respectively formed in the outer wall of the inner spline mounting seat.

[0007] As a further scheme of the application, one side of the inner spline mounting seat is provided with a needle seat, a bearing mounting hole is formed in the needle seat, a matched roller bearing is fixedly arranged on the bearing mounting surface, the outer wall of the roller bearing is fixedly connected with the inner wall of the bearing mounting hole, a bearing cover plate is fixedly installed on one side of the inner spline mounting seat through a bolt one, the bolt one is matched with the threaded hole one, and the bearing cover plate is matched with the roller bearing.

[0008] As a further scheme of the application, an oil injection port and a sealing screw mounting hole are respectively formed in the outer wall of the needle seat, the oil injection port and the sealing screw mounting hole are communicated through a connecting oil channel, a plurality of threaded holes two are arranged on one side of the needle seat, a plurality of needle pin holes are respectively formed in the needle seat, a plurality of closed expansion cavities are respectively formed in the inner walls of the plurality of needle pin holes, and the plurality of expansion cavities are communicated through a communication oil channel.

[0009] As a further embodiment of the present invention, an inner spline cover plate is provided on one side of the ejector pin seat, and a plurality of through holes are provided on one side of the inner spline cover plate. The plurality of through holes are respectively aligned with a plurality of threaded holes. A plurality of bolts are respectively provided in the plurality of through holes, and one end of the plurality of bolts passes through the plurality of through holes and is screwed into the plurality of threaded holes. An inner spline is provided on the inner wall of the inner spline cover plate.

[0010] As a further embodiment of the present invention, a plurality of threaded holes are provided on one side of the inner spline cover plate, a locking conical surface is provided on the outer wall of the inner spline cover plate, a plurality of tightening gaps are provided on the inner wall of the inner spline cover plate, a matching locking conical sleeve is fitted on the locking conical surface, a plurality of mounting through holes are provided on the locking conical sleeve, a plurality of bolts are respectively provided in the plurality of mounting through holes, and one end of the plurality of bolts passes through the plurality of mounting through holes and engages with the plurality of threaded holes.

[0011] As a further embodiment of the present invention, a plurality of countersunk holes are respectively provided on one side of the inner spline cover plate, a plurality of threaded holes are respectively provided on the inner wall of the plurality of countersunk holes, a plurality of guide pins are respectively threaded into the plurality of threaded holes, and a plurality of return springs are respectively sleeved on the plurality of guide pins.

[0012] As a further embodiment of the present invention, a plurality of matching ejector pins are provided in a plurality of ejector pin holes, a plurality of spring placement holes are provided on one side of the plurality of ejector pins, one end of a plurality of return springs is fixedly connected to the inner wall of a plurality of spring placement holes, and the other end of a plurality of return springs is fixedly connected to the inner wall of a plurality of countersunk holes.

[0013] As a further embodiment of the present invention, multiple steel ball fixing sockets are respectively provided on the other side of the multiple ejector pins, and multiple matching steel balls are provided in the multiple steel ball fixing sockets.

[0014] As a further embodiment of the present invention, multiple ball seats are installed in the multiple ball seat mounting holes by multiple bolts, and the multiple ball seats are adapted to multiple steel balls respectively.

[0015] As a further embodiment of the present invention, a sealing screw is installed in the internal thread of the sealing screw mounting hole, the upper half of the sealing screw is provided with an external thread that matches the sealing screw mounting hole, the sealing screw is provided with a step, a sealing ring is fixedly sleeved on the step, and a tapered sealing surface is provided at the bottom of the sealing screw.

[0016] Compared with related technologies, the mechanical-hydraulic coupling torque limiter provided by the present invention has the following advantages:

[0017] Beneficial effects:

[0018] 1. Through the fast plug connector inserts the oil injection port of the ejector seat, the high pressure oil is injected into the multiple annular expansion cavity in series on the ejector seat, and then the friction force is generated by the respective ejector pin hole holding the ejector pin, and the torque is further transmitted through the tangential component of the force of the steel ball and the ball seat;

[0019] 2. When overload, the axial force on the steel ball is greater than the friction force of the ejector pin, and the steel ball and the ball seat are separated from the contact, and the overload protection function is realized;

[0020] 3. After disengaging, the holding force can be relieved by the pressure relief of the sealing screw, and the reset is realized under the action of the reset spring. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to facilitate the understanding of those skilled in the art, the present application is further described below with reference to the accompanying drawings.

[0022] Figure 1 It is a side view structure schematic diagram of the machine liquid coupling torque limiter of the present application;

[0023] Figure 2 It is a cross-sectional structure schematic diagram of the inner spline mounting seat of the machine liquid coupling torque limiter of the present application;

[0024] Figure 3 It is a cross-sectional structure schematic diagram of the ejector seat of the machine liquid coupling torque limiter of the present application;

[0025] Figure 4 It is a cross-sectional structure schematic diagram of the inner spline cover plate of the machine liquid coupling torque limiter of the present application;

[0026] Figure 5 It is a cross-sectional structure schematic diagram of the ejector pin of the machine liquid coupling torque limiter of the present application;

[0027] Figure 6 It is a cross-sectional structure schematic diagram of the sealing screw of the machine liquid coupling torque limiter of the present application;

[0028] Figure 7 It is an enlarged schematic diagram of the communication oil channel structure of the machine liquid coupling torque limiter of the present application;

[0029] Figure 8 It is a front cross-sectional structure schematic diagram of the machine liquid coupling torque limiter of the present application;

[0030] Figure 9 It is a schematic diagram of the overall installation structure of the machine liquid coupling torque limiter of the present application;

[0031] Figure 10 It is a schematic diagram of the overall cross-sectional structure of the communication oil channel of the machine liquid coupling torque limiter of the present application.

[0032] In the figure: 1, inner spline mounting seat; 1-1, inner spline one; 1-2, threaded hole one; 1-3, bearing mounting surface; 1-4, ball seat mounting hole; 2, ejector pin seat; 2-1, bearing mounting hole; 2-2, oil injection port; 2-3, sealing screw mounting hole; 2-4, threaded hole two; 2-5, ejector pin pin hole; 2-6, expansion cavity; 2-7, communication oil channel; 3, inner spline cover plate; 3-1, inner spline two; 3-2, threaded hole three; 3-3, locking conical surface; 3-4, tightening gap; 3-5, counterbore; 3-6, threaded hole four; 3-7, through hole; 4, locking conical sleeve; 5, bearing cover plate; 6, roller bearing; 7, ball seat; 8, steel ball; 9, ejector pin; 9-1, spring placement hole; 9-2, steel ball fixing nest; 10, return spring; 11, guide pin; 12, sealing screw; 12-1, external thread; 12-2, step; 12-3, sealing ring; 12-4, conical sealing surface. DETAILED DESCRIPTION

[0033] Please refer to Figures 1 to 10 , wherein Figure 1 is a schematic diagram of the side cross-sectional structure of the machine-fluid coupling torque limiter of the application; Figure 2 is a schematic diagram of the inner spline mounting seat cross-sectional structure of the machine-fluid coupling torque limiter of the application; Figure 3 is a schematic diagram of the ejector pin seat cross-sectional structure of the machine-fluid coupling torque limiter of the application; Figure 4 is a schematic diagram of the inner spline cover plate cross-sectional structure of the machine-fluid coupling torque limiter of the application; Figure 5 is a schematic diagram of the ejector pin cross-sectional structure of the machine-fluid coupling torque limiter of the application; Figure 6 is a schematic diagram of the sealing screw cross-sectional structure of the machine-fluid coupling torque limiter of the application; Figure 7 is an enlarged schematic diagram of the communication oil channel structure of the machine-fluid coupling torque limiter of the application; Figure 8 is a schematic diagram of the front cross-sectional structure of the machine-fluid coupling torque limiter of the application; Figure 9 is a schematic diagram of the overall installation of the machine-fluid coupling torque limiter of the application; Figure 10 is a schematic diagram of the overall cross-sectional structure of the communication oil channel of the machine-fluid coupling torque limiter of the application. The machine-fluid coupling torque limiter comprises an inner spline mounting seat 1, an inner wall of the inner spline mounting seat 1 is provided with an inner spline one 1-1, a plurality of threaded holes one 1-2 are formed on one side of the inner spline mounting seat 1, a bearing mounting surface 1-3 is arranged on the outer wall of the inner spline mounting seat 1, and a plurality of ball seat mounting holes 1-4 are respectively formed on the outer wall of the inner spline mounting seat 1;

[0034] The side of the inner spline mounting seat 1 is provided with a thimble seat 2, the thimble seat 2 is provided with a bearing mounting hole 2-1, the bearing mounting surface 1-3 is fixedly provided with a matched roller bearing 6, the outer wall of the roller bearing 6 is fixedly connected with the inner wall of the bearing mounting hole 2-1, the side of the inner spline mounting seat 1 is fixedly provided with a bearing cover plate 5 through a bolt one, the bolt one is matched with a threaded hole one 1-2, the bearing cover plate 5 is matched with the roller bearing 6;

[0035] The outer wall of the thimble seat 2 is respectively provided with an oil inlet 2-2 and a sealing screw mounting hole 2-3, the oil inlet 2-2 and the sealing screw mounting hole 2-3 are communicated through a connecting oil channel 2-8, the side of the thimble seat 2 is respectively provided with a plurality of threaded holes two 2-4, the thimble seat 2 is respectively provided with a plurality of thimble pin holes 2-5, a plurality of closed expansion cavities 2-6 are respectively arranged in the inner wall of the plurality of thimble pin holes 2-5, and the plurality of expansion cavities 2-6 are communicated through a communication oil channel 2-7.

[0036] The high-pressure oil is injected into the plurality of annular expansion cavities in series on the thimble seat through the quick plug connector inserted into the oil inlet of the thimble seat, and then each thimble pin hole tightly holds the thimble pin to generate friction force, and the torque is further transmitted through the tangential component of the force of the steel ball and the ball seat.

[0037] The side of the thimble seat 2 is provided with an inner spline cover plate 3, a plurality of through holes 3-7 are arranged on the side of the inner spline cover plate 3, the plurality of through holes 3-7 are respectively located opposite to the plurality of threaded holes two 2-4, a plurality of bolts two are respectively arranged in the plurality of through holes 3-7, one end of the plurality of bolts two respectively passes through the plurality of through holes 3-7 and is screwed with the plurality of threaded holes two 2-4, and the inner wall of the inner spline cover plate 3 is provided with an inner spline two 3-1;

[0038] A plurality of threaded holes three 3-2 are arranged on the side of the inner spline cover plate 3, a locking conical surface 3-3 is arranged on the outer wall of the inner spline cover plate 3, a plurality of tightening gaps 3-4 are arranged on the inner wall of the inner spline cover plate 3, a matched locking conical sleeve 4 is sleeved on the locking conical surface 3-3, a plurality of mounting through holes are arranged on the locking conical sleeve 4, a plurality of bolts three are respectively arranged in the plurality of mounting through holes, and one end of the plurality of bolts three respectively passes through the plurality of mounting through holes and is screwed with the plurality of threaded holes three 3-2;

[0039] A plurality of counterbores 3-5 are respectively arranged on the side of the inner spline cover plate 3, a plurality of threaded holes four 3-6 are respectively arranged on the inner wall of the plurality of counterbores 3-5, a plurality of guide pins 11 are respectively screwed in the plurality of threaded holes four 3-6, and a plurality of return springs 10 are respectively sleeved on the plurality of guide pins 11;

[0040] A plurality of ejector pin holes 2-5 are respectively provided with a plurality of matched ejector pins 9, one side of the plurality of ejector pins 9 is respectively provided with a plurality of spring placing holes 9-1, one end of the plurality of return springs 10 is respectively fixedly connected with the inner wall of the plurality of spring placing holes 9-1, and the other end of the plurality of return springs 10 is respectively fixedly connected with the inner wall of the plurality of counterbores 3-5;

[0041] The other side of the plurality of ejector pins 9 is respectively provided with a plurality of steel ball fixing cavities 9-2, and the plurality of steel ball fixing cavities 9-2 are respectively provided with a plurality of matched steel balls 8.

[0042] The plurality of ball seat mounting holes 1-4 are respectively mounted with a plurality of ball seats 7 through a plurality of bolts, and the plurality of ball seats 7 are respectively matched with the plurality of steel balls 8.

[0043] When overload occurs, the axial force of the steel ball is greater than the friction force of the ejector pin, and then the steel ball slides, so that the steel ball and the ball seat are separated from each other, and the overload protection function is realized.

[0044] The sealing screw mounting hole 2-3 is threadedly mounted with a sealing screw 12, the upper half of the sealing screw 12 is provided with a matched external thread 12-1, the sealing screw 12 is provided with a step 12-2, the sealing ring 12-3 is fixedly sleeved on the step 12-2, and the bottom of the sealing screw 12 is provided with a tapered sealing surface 12-4.

[0045] After being separated, the sealing screw can be used for pressure relief, so that the holding force is eliminated, the position is returned under the action of the return spring, and the rapid online reset is realized again.

[0046] The working principle of the machine fluid coupling torque limiter provided by the application is as follows:

[0047] First step: before use, connect the input shaft and the inner spline 1-1 of the inner spline mounting seat 1, connect the output shaft and the inner spline 3-1 of the inner spline cover plate 3, and tighten the locking taper sleeve 4 to axially fix the whole, then align the steel ball 8 and the ball seat 7, and under the pressure of the return spring 10, the tapered surface of the steel ball 8 and the ball seat 7 is tightly attached, and then oil injection is carried out: insert the quick connector into the oil injection port 2-2 of the ejector pin seat 2, and inject high-pressure oil liquid from the external oil pump. The high-pressure oil liquid enters the annular gap between the lower end of the stepped 12-2 of the sealing screw 12 and the sealing screw mounting hole 2-3 through the connecting oil channel 2-8. Before use, the sealing screw 12 is pre-wound for one turn, so that the sealing tapered surface 12-4 and the bottom oil channel of the sealing screw mounting hole 2-3 are in an open state. Further oil liquid flows into each expansion cavity 2-6 in turn through the connecting oil channel 2-7. When the pressure reaches the set value, tighten the sealing screw 12, and use the sealing tapered surface 12-4 for high-pressure sealing. Finally, remove the quick connector after the hydraulic pump is depressurized, and the oil injection is completed. At this time, the ejector pin 9 cannot slide relative to the ejector pin hole 2-5, and the inner spline mounting seat 1, the ejector pin seat 2 and the inner spline cover plate 3 are fixed as a whole. At the same time, under the action of high-pressure oil liquid, each ejector pin hole 2-5 tightly holds the ejector pin 9, generating friction. Since the internal high-pressure oil liquid is in a static state after the pressure is released, the pressure is equal everywhere, and the theoretical size of the friction is consistent.

[0048] Second step: when in use, the torque is input through the inner spline 1-1 of the inner spline mounting seat 1, and further acts on the steel ball 8 through the tapered surface of the ball seat 7. The tangential component of the torque is transmitted, and finally output by the inner spline 3-1 of the inner spline cover plate 3. The axial component is offset by the friction of the ejector pin 9. When the axial component of the steel ball 8 reaches the static friction of the ejector pin 9, the ejector pin 9 will slide relative to the ejector pin hole 2-5, until the tapered surface of the ball seat 7 and the steel ball 8 are out of contact. At this time, the torque transmission will be cut off, realizing the overload protection function. Since the friction has a wide adjustable range, the disengagement torque also has a wide adjustable range. On the other hand, if the contact conditions of each steel ball 8 and the ball seat 7 are inconsistent due to machining and installation precision, the ejector pin 9 with good contact between the steel ball 8 and the ball seat 7 will slide first before overload disengagement, and then the ejector pin 9 with poor contact between the steel ball 8 and the ball seat 7 will gradually play a role, so that the final disengagement torque is not affected by the machining or installation precision. In addition, the ejector pin 9 can be arranged according to the torque load demand, so that the present application has the advantages of high precision, stable torque and high torque level.

[0049] Third step: before reset, insert the quick connector into the oil injection port 2-2 of the ejector pin seat 2, then slowly back off the tightened sealing screw 12 by one turn, so that the high-pressure oil in the expansion chamber 2-6 flows back to the hydraulic pump through the quick connector, realizing the environmental protection recovery of oil-free injection. Then align the steel ball 8 and the ball seat 7, and under the action of the reset spring 10, restore the contact, and finally repeat the oil injection operation to complete the reset. Therefore, the reset is convenient, safe and environmentally friendly.

[0050] It should be noted that the device structure and the drawings of the present application mainly describe the principles of the present application, and the setting of the power mechanism, power supply system and control system of the device is not fully described in the technical principle of the design principle, and the specific power mechanism, power supply system and control system can be clearly known by the skilled in the art under the premise of understanding the principles of the above application, the control mode of the application file is automatically controlled by the controller, and the control circuit of the controller can be realized by simple programming of the skilled in the art;

[0051] The standard parts used can be purchased from the market, and can be ordered according to the description and drawings, and the specific connection mode of each part adopts the conventional screw, rivet, welding and other conventional means in the prior art, the mechanical parts and equipment adopt the conventional type in the prior art, and the components known to the skilled in the art, the structure and principle thereof can be known by the skilled in the art through technical manual or through conventional experimental method.

[0052] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations of these embodiments can be made without departing from the principles and spirits of the present application, and can be directly or indirectly applied in other related technical fields, the scope of the present application is defined by the appended claims and their equivalents, and the same reason includes the patent protection range of the present application.

Claims

1. A mechanical-hydraulic coupling torque limiter, characterized in that, include: An internal spline mounting base is provided with an internal spline on its inner wall, and multiple threaded holes are provided on one side of the internal spline mounting base. A bearing mounting surface is provided on the outer wall of the internal spline mounting base, and multiple ball seat mounting holes are provided on the outer wall of the internal spline mounting base.

2. The mechanical-hydraulic coupling torque limiter according to claim 1, characterized in that: One side of the internal spline mounting base is provided with a ejector seat, and the ejector seat has a bearing mounting hole. A matching roller bearing is fixedly sleeved on the bearing mounting surface. The outer wall of the roller bearing is fixedly connected to the inner wall of the bearing mounting hole. A bearing cover plate is fixedly installed on one side of the internal spline mounting base by a bolt. The bolt is matched with the threaded hole, and the bearing cover plate is matched with the roller bearing.

3. The mechanical-hydraulic coupling torque limiter according to claim 2, characterized in that: The outer wall of the ejector pin seat is provided with an oil injection port and a sealing screw mounting hole, which are connected by a connecting oil passage. One side of the ejector pin seat is provided with multiple threaded holes, and multiple ejector pin holes are provided on the ejector pin seat. Multiple closed expansion cavities are provided on the inner wall of the multiple ejector pin holes, and the multiple expansion cavities are connected by a connecting oil passage.

4. The mechanical-hydraulic coupling torque limiter according to claim 3, characterized in that: The ejector pin seat has an inner spline cover plate on one side. Multiple through holes are opened on one side of the inner spline cover plate. The multiple through holes are respectively aligned with multiple threaded holes. Multiple bolts are respectively installed in the multiple through holes. One end of the multiple bolts passes through the multiple through holes and is screwed into the multiple threaded holes. The inner wall of the inner spline cover plate is provided with an inner spline.

5. The mechanical-hydraulic coupling torque limiter according to claim 4, characterized in that: The inner spline cover plate has multiple threaded holes on one side, a locking cone surface on the outer wall of the inner spline cover plate, and multiple tightening gaps on the inner wall of the inner spline cover plate. A matching locking cone sleeve is fitted on the locking cone surface, and multiple mounting through holes are provided on the locking cone sleeve. Multiple bolts are respectively provided in the multiple mounting through holes, and one end of each bolt passes through the multiple mounting through holes and engages with the multiple threaded holes.

6. The mechanical-hydraulic coupling torque limiter according to claim 5, characterized in that: The inner spline cover plate has multiple countersunk holes on one side, and multiple threaded holes are formed on the inner wall of the countersunk holes. Multiple guide pins are threaded into the multiple threaded holes, and multiple return springs are fitted on the multiple guide pins.

7. The mechanical-hydraulic coupling torque limiter according to claim 3, characterized in that: Multiple matching ejector pins are provided in multiple ejector pin holes. Multiple spring placement holes are opened on one side of multiple ejector pins. One end of multiple return springs is fixedly connected to the inner wall of multiple spring placement holes, and the other end of multiple return springs is fixedly connected to the inner wall of multiple countersunk holes.

8. The mechanical-hydraulic coupling torque limiter according to claim 7, characterized in that: Multiple steel ball fixing sockets are provided on the other side of the multiple ejector pins, and multiple matching steel balls are provided in the multiple steel ball fixing sockets.

9. The mechanical-hydraulic coupling torque limiter according to claim 1, characterized in that: Multiple ball seats are installed in multiple ball seat mounting holes by multiple bolts, and each ball seat is adapted to a multiple steel ball.

10. The mechanical-hydraulic coupling torque limiter according to claim 2, characterized in that: A sealing screw is installed in the internal thread of the sealing screw mounting hole. The upper part of the sealing screw has an external thread that matches the sealing screw mounting hole. The sealing screw has a step, and a sealing ring is fixedly fitted on the step. The bottom of the sealing screw has a tapered sealing surface.

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