A rolling friction trapezoidal screw

Abstract

The present invention belongs to the field of trapezoidal screw transmission, and relates to the manufacture of a rolling friction trapezoidal screw; its innovative feature is that it is composed of two major parts, a trapezoidal screw and a rolling friction nut; the rolling friction nut is composed of a nut housing, a trapezoidal spiral rolling body and a bearing; the nut housing is connected and fixed with a plurality of trapezoidal screw column rolling bodies having the same pitch and lead as the trapezoidal screw through the bearing; the trapezoidal screw column rolling bodies are distributed in a circular planetary manner and mutually embedded in the axial direction of the trapezoidal screw; when the trapezoidal screw rotates and the rolling friction nut is fixed, the trapezoidal screw column rolling bodies rotate synchronously with the trapezoidal screw; at the same time, through the principle of spiral transmission, the rotational power of the trapezoidal screw is transmitted to the bearing nut housing through the bearing, and the rotational motion of the trapezoidal screw is converted into a mechanical product of the linear reciprocating motion of the nut. The present invention becomes the second high-quality type after the sliding friction trapezoidal screw, i.e., the ordinary trapezoidal screw, and has a self-locking function, a reasonable design, and a wide range of applications.

Description

Technical Field

[0001] The invention relates to the field of manufacturing a trapezoidal screw rod for threaded transmission, and in particular to a manufacturing scheme for a rolling friction trapezoidal screw rod. Background Art

[0002] At present, the known trapezoidal screw structure is composed of a set of nut and trapezoidal screw. When the trapezoidal screw rotates and the nut is fixed, under the action of the helix angle, sliding occurs to push the nut to produce linear displacement motion. Sliding friction of the helical surface contact type is generated between the nut and the trapezoidal screw. For this reason, the screw and the nut wear each other and generate thermal effects, which reduces the transmission accuracy. There is sliding friction between the components, and the input power consumed is large, so the efficiency is low. In terms of production style, the tooth shape of the trapezoidal screw is trapezoidal, and the helical direction is left-handed and right-handed, and there is also a plain grain without a helix angle. Generally speaking, the trapezoidal screw will be equivalent to a sliding friction screw, and the ball and roller screws will be equivalent to rolling friction screws. They cannot be self-locking and can be driven in reverse, so they are highly efficient and have low input power consumption, but the ball screw is not resistant to impact loads and has weak load-bearing capacity. There has never been a differential screw design in the history of ball screws. In the history of roller screws, there have indeed been designs for differential screws. In 1986, the differential planetary roller screw pair was invented, and its structure has been reformed since then. Among them, the German Aerospace Center developed the PWG differential planetary roller screw pair in 1993 to meet the mass restrictions of its first-generation remote-controlled robot transmission components under heavy load conditions. As a type of differential planetary roller screw pair, it cleverly combines planetary transmission and spiral transmission, and uses the differential principle of external spiral meshing to make the actual stroke of the screw pair smaller than the main screw lead. At present, there is very little international discussion on differential planetary roller screw pairs. The material requirements for roller screws are high, the rollers are subjected to complex internal stresses, and the difference in the rise angle of line contact makes it difficult to synchronize the load. Now the theoretical basis of differential planetary roller screw pairs needs to be updated. Trapezoidal screws are mainly used in transmission and position adjustment devices. Compared with ball and roller screws, although they have disadvantages such as greater friction, lower transmission efficiency, and relatively faster wear, they have the advantages of low cost, large load-bearing capacity, compact and simple structure, and self-locking. They are widely used in various common machine tools and industrial equipment such as lifts. Although the current ball and roller screws can cope with higher design loads like trapezoidal screws, and have high transmission efficiency, they cannot replace trapezoidal screws in many applications. For example, in some applications, lower transmission efficiency becomes an advantage of trapezoidal screws or sliding screws. In vertical lifting applications or where designers do not want the screw to be driven in reverse, the trapezoidal screw can keep the load in place without using a motor with a brake device or an additional brake device in the system. In theory, as long as the lead of the trapezoidal screw is less than one-third of the screw diameter, the above self-locking condition can be established. Due to the lower transmission efficiency, the torque requirement for driving the sliding friction trapezoidal screw will be higher, so a motor with greater torque is required.However, this is only one aspect of the cost structure. As long as the higher unit cost of ball screws and roller screws, maintenance, lubrication and its adverse effects, brakes to prevent reverse drive in vertical lifting applications, and optional nuts to eliminate reverse clearance are taken into account, the overall cost and advantages of sliding friction trapezoidal screws are sufficient to be reflected. It can be seen that the trapezoidal screw cannot be reverse driven, and the strong demand for all mechanisms to keep the position locked selects the irreplaceable self-locking advantage of the trapezoidal screw. In general, ball screws are not resistant to impact loads, roller screw differential design solutions are limited, and trapezoidal screws are inefficient, consume a lot of energy, and wear quickly.

[0003] At present, trapezoidal lead screws are used in all aspects of national production and play a huge role. In order to better broaden the application field of trapezoidal lead screws and increase the scope of application, differential design solutions are included to break the limitations of efficiency, life and precision, increase the service life of the machine and reduce the cost. Inventing innovative trapezoidal lead screws and new rolling friction nuts is an urgent need. Because trapezoidal lead screws are also the basic key mechanical components of the future direction of intelligent machines, it is extremely important to use innovation to meet the current situation! Summary of the invention

[0004] In order to overcome the shortcomings of the above-mentioned traditional sliding friction nuts and retain the excellent self-locking property of the trapezoidal screw, the present invention provides a new trapezoidal screw rolling friction nut, which is connected and fixed by a nut housing through a bearing to multiple rolling bodies around the trapezoidal spiral with the same pitch and lead as the trapezoidal screw. The rolling bodies around the trapezoidal spiral are distributed in a circular planetary manner and interlocked in the axial direction of the trapezoidal screw. When the trapezoidal screw rotates and the rolling friction nut is fixed, the rolling bodies around the trapezoidal spiral rotate synchronously with the trapezoidal screw. At the same time, through the principle of spiral transmission, the rotational power of the trapezoidal screw is transmitted to the bearing nut housing through the thrust bearing, and the rotational motion of the trapezoidal screw is converted into the linear reciprocating motion of the nut, thus completing the manufacturing scheme of the trapezoidal screw that converts the input rotational motion into the output linear motion. In terms of mechanical principles, the above-mentioned rolling friction goals are fully and effectively achieved, and the machinery cost is economical. The defects of ordinary sliding friction nuts, such as the decrease in precision and low transmission efficiency caused directly by sliding friction, are solved at the same time. The design is reasonable, small in size, light in tonnage, low in energy consumption, and low in manufacturing requirements. It can retain the advantages of self-locking and improve the transmission efficiency in a breakthrough way. It becomes the second high-quality type of rolling friction nut trapezoidal screw after the ordinary sliding friction nut trapezoidal screw. For this reason, the introduction of the scheme of the present invention immediately completes the two types of nuts that the trapezoidal screw should have and must have under various working conditions. Let the trapezoidal screw nut type system be more comprehensive, more superior, more perfect, and more completely applied in all aspects of national production. This invention has epoch-making significance and far-reaching impact on the manufacturing industry. The major industrialized countries in the world attach great importance to the research and development of key screw technologies. China is a big country and should take the lead.

[0005] In order to achieve the above-mentioned object of the invention, the technical solution of the present invention is as follows:

[0006] The rolling friction trapezoidal screw is composed of two major parts: the trapezoidal screw and the rolling friction nut. The rolling friction nut is composed of a nut housing, a bearing, and a rolling body around the trapezoidal spiral. The nut housing is connected and fixed by a bearing to multiple rolling bodies around the trapezoidal spiral with the same pitch and lead as the trapezoidal screw. The rolling bodies around the trapezoidal spiral are distributed in a circular planetary circle around the axial direction of the trapezoidal screw and are interlocked. When the trapezoidal screw rotates and the rolling friction nut is fixed, the rolling bodies around the trapezoidal spiral rotate synchronously with the trapezoidal screw. At the same time, through the principle of spiral transmission, the rotational power of the trapezoidal screw is transmitted to the load-bearing nut housing through the bearing, converting the rotational motion of the trapezoidal screw into the linear reciprocating motion of the nut. In this way, the trapezoidal screw rotates and the sliding friction nut carries the motion to complete the mechanical manufacturing principles and methods of the rotational motion to linear motion. The following aspects are included:

[0007] Rolling friction trapezoidal screw, output precision is precision type: see attached Figure 1-4The principle scheme diagram of the toothless rolling friction trapezoidal screw is a matching motion structure. As shown in the figure: the rolling friction trapezoidal screw is composed of two major parts: the trapezoidal screw and the rolling friction nut. The rolling friction nut is composed of a nut housing, a bearing, and a rolling body around the trapezoidal spiral. The nut housing is connected and fixed through the bearing to multiple rolling bodies around the trapezoidal spiral with the same pitch and lead as the trapezoidal screw. The rolling bodies around the trapezoidal spiral are distributed in a circular planetary circle around the axial direction of the trapezoidal screw and are interlocked. When the trapezoidal screw rotates and the rolling friction nut is fixed, the rolling bodies around the trapezoidal spiral rotate synchronously with the trapezoidal screw. At the same time, through the principle of spiral transmission, the rotational power of the trapezoidal screw is transmitted to the bearing nut housing through the bearing, converting the rotational motion of the trapezoidal screw into the linear reciprocating motion of the nut. In this way, the manufacturing style of the rolling body around the trapezoidal spiral has not changed. Like the trapezoidal screw, the tooth profiles cooperate with each other and fit together for transmission, which is a matching motion structure.

[0008] Rolling friction trapezoidal screw, output precision is ultra-high precision type: see attached Figure 5 The principle diagram of the peak-valley tooth rolling friction trapezoidal screw is a meshing motion structure. As shown in the figure: the rolling friction trapezoidal screw is composed of two major parts: the trapezoidal screw and the rolling friction nut. The rolling friction nut is composed of a nut housing, a bearing, and a rolling body around the trapezoidal spiral. The nut housing is connected and fixed through the bearing to multiple rolling bodies around the trapezoidal spiral with the same pitch and lead as the trapezoidal screw. The rolling bodies around the trapezoidal spiral are distributed in a circular planetary circle around the axial direction of the trapezoidal screw and are interlocked. When the trapezoidal screw rotates and the rolling friction nut is fixed, the rolling bodies around the trapezoidal spiral rotate synchronously with the trapezoidal screw. At the same time, through the principle of spiral transmission, the rotational power of the trapezoidal screw is transmitted to the bearing nut housing through the bearing, converting the rotational motion of the trapezoidal screw into the linear reciprocating motion of the nut. In this way, the manufacturing style of the rolling body around the trapezoidal spiral has changed, and the teeth are manufactured at the peak and valley positions of the thread teeth of the trapezoidal screw. The tooth profiles are meshed with each other, and the tooth meshing transmission is a meshing motion structure. Similar to the principle of toothless matching motion structure, the design of the peaks and valleys of the trapezoidal lead screw and the rolling elements surrounding the trapezoidal spiral is changed, and the corresponding gear tooth structure is processed. The structure is slightly more complicated and the cost is increased, but the reliability and assemblability are increased, thereby ensuring motion matching and improving accuracy.

[0009] The present invention includes important invention point 1: the newly created rolling friction nut has two precision specifications, and adopts two rolling matching response modes respectively, one is a fitting type and the other is a meshing type.

[0010] The present invention includes important invention point 2: the rolling body surrounding the trapezoidal spiral in the matching trapezoidal lead screw and the nut does not change the appearance, and still retains the original production style of the trapezoidal lead screw.

[0011] The present invention includes important invention point 3: the meshing trapezoidal screw and the rolling body surrounding the trapezoidal spiral in the nut need to be changed in appearance, retaining the original production style of the trapezoidal screw, adding mutually coordinated intersecting peak and valley positions on the rolling body in the trapezoidal screw and the nut, and setting the same module gear tooth profile to mesh with each other to ensure that the rolling body surrounding the trapezoidal spiral in the trapezoidal screw and the nut rotate synchronously, uniformly, and in step.

[0012] The present invention includes important invention point 4: no matter which rolling matching response mode is used, the trapezoidal rolling elements in the nut are rolling elements around the trapezoidal spiral with the same lead of the trapezoidal screw. The diameters may be different, but the leads and trapezoidal tooth types must be matched with each other, otherwise, they cannot rotate synchronously to convert motion. At the same time, the positional relationship between the rolling elements around the trapezoidal spiral and the trapezoidal screw is generally non-vertical and non-parallel. It is dominated by the helix angle, and the close fit of the interlocking rotating surfaces is prioritized.

[0013] The present invention includes an important invention point 5: the meshing trapezoidal lead screw and the rolling element in the nut are provided with gear teeth of the same modulus, the movement process must be precisely meshed with each other, and the gear teeth should be smoothly and evenly distributed according to the interlocking spiral wires.

[0014] The present invention includes important invention point 6: the rolling friction trapezoidal screw nut can be a single nut or two or more axially stacked combined nuts, which are designed to improve the nut's load-bearing capacity.

[0015] The present invention includes important invention point 7: the tooth profile of the rolling friction trapezoidal screw is trapezoidal, the tooth profile is thick and strong, the production process is mature and simple, the manufacturing material selection has relatively low requirements for special steel, and the contact between the trapezoidal screw and the trapezoidal spiral rolling component is an embedded and fitted multi-faceted contact with a high load-bearing capacity; different from the Gothic groove of the ball screw, the production process is complicated, and the manufacturing material selection has relatively high requirements for special steel, the contact between the ball screw and the ball and nut is multi-point contact, and the load-bearing capacity is weak; it is even more different from the 90° tooth angle of the roller screw, there are many transmission parts, the production and assembly process is complicated, and the special steel used in the manufacturing can be produced by few countries. The contact between the roller screw and the roller and nut is multi-line contact, and the load-bearing capacity is better.

[0016] By implementing the above-mentioned principles and methods of trapezoidal screw machine manufacturing, the original intention of the present invention, the rolling friction trapezoidal screw, can be achieved, and all the above-mentioned superior purposes desired to be achieved can be realized.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) Excavating the ancient wisdom heritage, reform and innovation bring a new rolling friction trapezoidal lead screw nut, which becomes the "second type of nut" besides the ordinary sliding friction nut - rolling friction nut, making the existing production technology more reasonable and efficient.

[0019] 2) Implement and use rolling friction trapezoidal screw, using existing mechanical components, with simple structure, great wisdom in simplicity, faster to master technical principles, high rolling friction efficiency, high production and use precision, long life, no obstacles to its promotion, and wider application.

[0020] 3) At present, through the application of simple assembly technology, the feasibility of ultra-high power trapezoidal lead screw will be verified, and technical experience will be accumulated for the subsequent production and application of giant machines. Afterwards, it will become possible to produce super giant machines that are heavy equipment for a large country. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention has six drawings in total. Among them:

[0022] Attached Figure 1 It is an external schematic diagram (three-dimensional digital model) of the precision-fitting specific embodiment 1 of the present invention.

[0023] Attached Figure 2 It is a schematic diagram of the internal assembly (three-dimensional digital model) of the precision fitting specific embodiment 1 of the present invention.

[0024] Attached Figure 3 It is a schematic diagram of the assembly and disassembly of the (three-dimensional digital model) of the precision fitting specific embodiment 1 of the present invention.

[0025] Attached Figure 4 It is a schematic diagram of a combined nut housing according to a specific embodiment 2 of the present invention.

[0026] Attached Figure 5 It is a schematic diagram of the ultra-precision meshing principle of specific embodiment 3 of the present invention.

[0027] Attached Figure 6 It is a schematic diagram of the principle of a trapezoidal internal thread electric cylinder according to a specific embodiment 4 of the present invention.

[0028] In the figure, 1, trapezoidal lead screw 2, nut housing 3, rolling element around trapezoidal spiral 4, thrust bearing 5, rolling bearing 6, combined nut housing 7, trapezoidal peak-valley tooth lead screw 8, trapezoidal peak-valley tooth spiral rolling element 9, fixed cylinder part 10, moving cylinder part 11, trapezoidal internal thread 12, input spindle 13, thrust bearing 14, positioning snap ring 15, coupling 16, rotating seat plate DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with specific implementation modes, but this should not limit the protection scope of the present invention.

[0030] Figure 1 The example is a classic external schematic diagram of the precision fit-in principle, which consists of a trapezoidal lead screw (1) and a nut housing (2) that has been assembled with a rolling friction component.

[0031] Figure 2 ,for Figure 1 The schematic diagram of the internal assembly of the example clearly shows that it is composed of a trapezoidal screw (1) and a nut housing (2) that has been assembled with a rolling friction component. The rolling friction component has a rolling element (3) surrounding the trapezoidal screw, a thrust bearing (4), and a rolling bearing (5) to form an assembly.

[0032] Figure 3 ,for Figure 1 The schematic diagram of the example assembly disassembly clearly shows that it is composed of a trapezoidal screw (1) and a nut housing (2) that has been assembled with a rolling friction component. The rolling friction component has a rolling element (3) surrounding the trapezoidal screw and a thrust bearing and a rolling bearing (5) forming an assembly. They are precisely fitted around the axis of the trapezoidal screw (1).

[0033] exist Figure 1-3 Embodiment 1 is shown in the figure, as shown in the figure: the rolling friction trapezoidal screw is composed of two major components: a trapezoidal screw (1) and a rolling friction nut. The rolling friction nut is composed of a nut housing (2), a thrust bearing (4), a rolling bearing (5), and a rolling body (3) surrounding a trapezoidal spiral. The nut housing (2) is connected and fixed with a plurality of rolling bodies (3) surrounding the trapezoidal spiral with the same pitch and lead as the trapezoidal screw through the bearing. The rolling bodies (3) surrounding the trapezoidal spiral are distributed in a planetary manner around the axial direction of the trapezoidal screw (1) and are mutually embedded and embraced. When the trapezoidal screw (1) is rotated, the rolling bodies (3) surrounding the trapezoidal spiral are rotated and locked. When the trapezoidal screw (1) rotates and the rolling friction nut is fixed, the rolling body (3) around the trapezoidal screw rotates synchronously with the trapezoidal screw (1). At the same time, through the principle of spiral transmission, the rotational power of the trapezoidal screw (1) is transmitted to the supporting nut housing (2) through the bearing, and the rotational motion of the trapezoidal screw is converted into the linear reciprocating motion of the nut. In this way, the manufacturing style of the rolling body (3) around the trapezoidal screw does not change. Like the trapezoidal screw (1), the tooth profiles cooperate with each other and fit together for transmission, which is a kind of implementation method for the matching motion structure.

[0034] exist Figure 4Embodiment 2 is shown in the figure: the rolling friction trapezoidal screw is composed of two major components: a trapezoidal screw (1) and a rolling friction nut. The rolling friction trapezoidal screw nut can be a single nut or two or more axially superimposed combined nuts. The combined design will improve the nut's bearing capacity. The combined nut housing (6) combines two or more single nuts, which is also a method of implementing the motion structure.

[0035] exist Figure 5 In the embodiment 3 shown in the figure, the rolling friction trapezoidal screw is composed of two major parts: a trapezoidal peak-valley tooth screw (7) and a rolling friction nut. The rolling friction nut is composed of a nut housing, a bearing, and a trapezoidal peak-valley tooth spiral rolling body (8). The nut housing is connected and fixed with a plurality of trapezoidal peak-valley tooth spiral rolling bodies (8) having the same pitch and lead as the trapezoidal peak-valley tooth screw (7) through the bearing. The trapezoidal peak-valley tooth spiral rolling bodies (8) are distributed in a planetary manner around the axial direction of the trapezoidal peak-valley tooth screw (7) and are mutually embedded and embraced. When the trapezoidal peak-valley tooth screw (7) rotates and the rolling friction nut is fixed, the trapezoidal peak-valley tooth screw (7) rotates. The rotating rolling body (8) rotates synchronously with the trapezoidal peak-valley tooth screw (7), and at the same time, through the principle of spiral transmission, the rotating power of the trapezoidal peak-valley tooth screw (7) is transmitted to the bearing nut housing through the bearing, and the rotating motion of the trapezoidal peak-valley tooth screw (7) is converted into the linear reciprocating motion of the nut, as shown in the principle diagram: the trapezoidal peak-valley tooth screw (7) and the trapezoidal peak-valley tooth spiral rolling body (8) are used in combination, so that the manufacturing style of the rolling body around the trapezoidal spiral is changed, and the teeth are manufactured at the peak and valley positions of the wire teeth of the trapezoidal screw, and the tooth shapes are meshed with each other, and the transmission by the tooth meshing is a meshing motion structure. The same as the principle of the toothless matching motion structure, the design of the wire teeth peak and valley of the trapezoidal screw and the rolling body around the trapezoidal spiral in Example 1 is changed, and the corresponding gear tooth structure is processed, the structure is slightly complicated, and the cost is increased, but the reliability and assembly are increased, and then the motion matching is guaranteed and the accuracy is improved.

[0036] exist Figure 6The embodiment 4 shown in the figure is an example of the internal thread transmission mode of the rolling friction trapezoidal screw rod, which is a schematic diagram of the principle of the trapezoidal internal thread electric cylinder. From the appearance, it is mainly composed of two major parts: a fixed cylinder part (9) and a moving cylinder part (10). As shown in the schematic diagram: the moving cylinder part (10) is sleeved in the fixed cylinder part (9), and the moving cylinder part (10) has a trapezoidal internal thread tooth (11). The fixed cylinder part (9) is connected by an input main shaft (12), a thrust bearing (13), a positioning retaining ring (14), a coupling (15), and a rotating seat plate (16) and inserted into the moving cylinder part (10). In a state where it can rotate, it passes through and is fixed to the rear through hole of the fixed cylinder part (9). On the rotating seat plate (16) inserted into the moving cylinder part (10), a plurality of thrust bearings (4), rolling shafts (11) are installed. The assembly is composed of a bearing (5) and a rolling body (3) surrounding a trapezoidal spiral. At the same time, the rolling body (3) surrounding the trapezoidal spiral and the trapezoidal internal thread teeth (11) in the moving cylinder part (10) are arranged in a planetary manner in a circumferential manner in the cylinder body and fit in with each other. When the input main shaft (12) is driven to rotate by the input power of the motor behind the coupling (15) and the fixed cylinder part (9) is fixed, the input main shaft (12) drives the rotating seat plate (16) to rotate. The rolling body (3) surrounding the trapezoidal spiral and the trapezoidal internal thread teeth (11) in the moving cylinder part (10) fit in with each other. Through the screw transmission principle, the rotational power of the input main shaft (12) is transmitted to the bearing moving cylinder part (10) through the trapezoidal internal thread teeth (11), thereby converting the rotational motion of the input motor into the linear reciprocating motion of the moving cylinder part (10).

[0037] The above are only four specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. All technicians familiar with the technical field shall, within the technical scope disclosed in the present invention, make equivalent replacements or changes according to the technical scheme of the present invention and the concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A rolling friction trapezoidal screw, characterized by: The rolling friction trapezoidal screw has two major parts: the trapezoidal screw and the rolling friction nut; the rolling friction nut is composed of a nut housing, a rolling bearing, a thrust bearing and a trapezoidal spiral rolling element. The rolling bearing, the thrust bearing and the trapezoidal spiral rolling element are assembled in the nut housing. The multiple trapezoidal spiral rolling elements are distributed in a circular planetary manner and are connected to the trapezoidal screw thread transmission; The trapezoidal spiral rolling element and the trapezoidal screw are a matching combination with the same lead; Use axially stacked combined nuts to improve the nut load-bearing capacity; The rolling friction trapezoidal screw adopts the trapezoidal screw internal thread transmission mode; The trapezoidal internal thread electric cylinder of the internal thread transmission mode of the rolling friction trapezoidal screw rod is composed of two major parts: a fixed cylinder part (9) and a moving cylinder part (10). The moving cylinder part (10) is sleeved in the fixed cylinder part (9). The inner cylinder wall of the moving cylinder part (10) is provided with a trapezoidal internal thread tooth (11). In the fixed cylinder part (9), an input spindle (12), a thrust bearing (13), a positioning snap ring (14), a coupling (15), and a rotating seat plate (16) are connected to each other. The input spindle (12) passes through and is fixed in the rear through hole of the fixed cylinder part (9) while ensuring that it can rotate, enters the inner cylinder wall of the fixed cylinder part (9), and is then connected to the rotating seat plate (16) in the moving cylinder part (10). A plurality of thrust bearings (4), rolling bearings (5), The assembly is composed of a trapezoidal spiral rolling body (3), and the trapezoidal spiral rolling body (3) is planetarily distributed in a circumferential manner in the cylinder body of the moving cylinder part (10), and is interlocked and matched with the trapezoidal internal thread teeth (11) in the moving cylinder part (10). When the input main shaft (12) is driven to rotate by the input power of the motor behind the coupling (15), and the fixed cylinder part (9) is fixed, the input main shaft (12) drives the rotating seat plate (16) to rotate, and the interlocked and matched trapezoidal spiral rolling body (3) and the trapezoidal internal thread teeth (11) in the moving cylinder part (10) transmit the rotational power of the input main shaft (12) to the bearing moving cylinder part (10) through the trapezoidal internal thread teeth (11) through the screw transmission principle, and convert the rotational motion of the input motor into the linear reciprocating motion of the moving cylinder part (10).

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