Novel lead screw connecting structure

Abstract

The utility model discloses a novel lead screw connecting structure which comprises a lead screw, a motor shaft, a connecting rod and a valve element, internal threads are arranged inside the motor shaft, the lead screw is connected with the internal threads of the motor shaft, the connecting rod is fixedly connected with the lead screw, the rear end of the valve element is fixedly connected with the front end of the connecting rod, and the overall length of the novel lead screw connecting structure is not larger than 130 mm. And preferably, the diameter is 124.6 mm. Compared with a traditional lead screw connecting structure, the novel lead screw connecting structure has the advantages that the overall length of the lead screw connecting structure is shortened, so that the space occupied by the lead screw connecting structure is reduced, the overall size of the hydraulic valve can be reduced, and cost is saved; in addition, the concentricity tolerance release bias force of the connecting rod is reduced, so that the processing requirement of the connecting rod can be relaxed, the yield is improved, the cost is reduced, the radial bias force of a moving part (the valve core) is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission structures, in particular to a novel screw rod connection structure. Background Art

[0002] A hydraulic valve is an automated component operated by pressurized oil. The electromagnetic force generated by an electromagnet controls the movement of the valve core to achieve reversal. A screw connection structure is provided in the hydraulic valve to achieve the transmission of the valve core. The screw connection structure usually includes a screw, a motor shaft, a connecting rod, a valve core and other components. The motor shaft is threadedly connected to the screw, and the screw is fixedly connected to the valve core through the connecting rod. A rotor is installed on the motor shaft. When working, the motor shaft is driven to rotate by the rotor. Furthermore, the rotation of the motor shaft causes the screw to move linearly along the axial direction of the motor shaft, that is, the valve core is synchronously driven to move linearly through the connecting rod to open or close different oil discharge holes to drive the piston to move, thereby achieving functions such as ordinary reversing, proportional reversing, pressure regulation, and flow regulation.

[0003] However, the existing above-mentioned screw connection structure has the following technical problems: the overall length of the screw connection structure (i.e., the length between the rear end of the motor shaft and the front end of the valve core) is relatively large, and its overall length usually exceeds 140 mm (measured by the applicant, the overall length even reaches 150.7 mm), resulting in the screw connection structure as a whole occupying a larger space, which in turn leads to increased costs. Utility Model Content

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the utility model provides a novel screw rod connection structure, which can solve the above technical problems.

[0006] (II) Technical solution

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions: a new screw connection structure, comprising: a screw, a motor shaft, a connecting rod and a valve core, the interior of the motor shaft is provided with an internal thread, the screw is connected to the internal thread of the motor shaft, the connecting rod is fixedly connected to the screw, the rear end of the valve core is fixedly connected to the front end of the connecting rod, and the overall length of the new screw connection structure is not more than 130 mm.

[0008] Preferably, the overall length of the novel screw rod connection structure is 124.6 mm.

[0009] Preferably, the screw rod comprises a screw rod body and a rotation limiting portion, wherein the rotation limiting portion is arranged at the front end of the screw rod body, and an external thread is arranged between the rotation limiting portion and the rear end of the screw rod body.

[0010] Preferably, the screw rod body is provided with a through hole running through the length direction thereof, the connecting rod passes through the through hole and the rear end of the connecting rod is exposed outside the through hole.

[0011] Preferably, a nut is provided at the rear end of the connecting rod, and the nut is in contact with the rear end of the screw rod body.

[0012] Preferably, the connecting rod comprises a connecting rod body and a mounting portion, wherein the mounting portion is arranged at the front end of the connecting rod body, the connecting rod body passes through the through hole and the rear end of the connecting rod body is exposed outside the through hole.

[0013] Preferably, a mounting hole is provided at the rear end of the valve core along its length direction, and the mounting portion is inserted into the mounting hole.

[0014] Preferably, a protrusion is provided on the connecting rod body near the mounting portion, a limit piece is provided at the front end of the protrusion, and the rear end of the valve core is in contact with the limit piece.

[0015] Preferably, a sealing ring and a sealing ring are sleeved on the motor shaft.

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the utility model provides a new screw connection structure, which has the following beneficial effects: the overall length of the new screw connection structure of the utility model is not more than 130 mm. Compared with the traditional screw connection structure, the overall length of the screw connection structure is shortened to reduce the space occupied by the screw connection structure, thereby reducing the overall volume of the hydraulic valve and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a first stereoscopic diagram of a novel screw rod connection structure of the utility model;

[0019] Figure 2 This is a second stereoscopic view of a novel screw rod connection structure of the utility model;

[0020] Figure 3 This is a front view of a novel screw rod connection structure of the utility model;

[0021] Figure 4 It is a three-dimensional diagram of the screw rod and the motor shaft of the utility model;

[0022] Figure 5 It is a three-dimensional diagram of the screw rod, connecting rod and valve core of the utility model;

[0023] Figure 6 It is a three-dimensional diagram of the screw rod and the connecting rod of the utility model;

[0024] Figure 7 It is a three-dimensional diagram of the screw rod of the utility model;

[0025] Figure 8 It is a three-dimensional diagram of the connecting rod of the utility model;

[0026] Fig. 9 It is a three-dimensional diagram of the valve core of the utility model.

[0027] The numbers in the figure are: 1 screw rod, 2 motor shaft, 3 connecting rod, 4 valve core, 5 screw rod body, 6 rotation limiter, 7 external thread, 8 through hole, 9 nut, 10 connecting rod body, 11 mounting part, 12 mounting hole, 13 raised part, 14 limiter, 15 sealing ring, 16 sealing ring. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] The utility model provides a novel screw connection structure, comprising a screw 1, a motor shaft 2, a connecting rod 3 and a valve core 4. The motor shaft 2 is provided with an internal thread, the screw 1 is connected to the internal thread of the motor shaft 2, the connecting rod 3 is fixedly connected to the screw 1, the rear end of the valve core 4 is fixedly connected to the front end of the connecting rod 3, and the screw 1, the motor shaft 2, the connecting rod 3 and the valve core 4 are all coaxially arranged. Among them, the overall length of the novel screw connection structure of the utility model (i.e.: the length between the rear end of the motor shaft 2 and the front end of the valve core 4) is not greater than 130mm; preferably, the overall length of the novel screw connection structure is 124.6mm.

[0030] The utility model can be applied to devices such as hydraulic valves, and the movement of the valve core is controlled by the electromagnetic force generated by the electromagnet to achieve the reversal of the hydraulic valve, etc. Specifically, a rotor is installed on the motor shaft 2, and the rotor cooperates with the stator. When working, the motor shaft 2 is driven by the rotor to rotate in the forward or reverse direction. Furthermore, since the screw rod 1 and the motor shaft 2 are threadedly connected, the screw rod 1 is caused to make a forward or backward linear motion along the axial direction of the motor shaft 2 through the rotation of the motor shaft 2, thereby realizing the conversion of rotational motion-linear motion. Furthermore, the valve core 4 is synchronously driven to make a forward or backward linear motion synchronously through the connecting rod 3, so as to open or close different oil discharge holes of the hydraulic valve to drive the piston to move, thereby realizing functions such as ordinary reversing, proportional reversing, pressure regulation, and flow regulation.

[0031] Specifically, the screw 1 includes a screw body 5 and a rotation limiting portion 6, the rotation limiting portion 6 is arranged at the front end of the screw body 5, and an external thread 7 is arranged between the rotation limiting portion 6 and the rear end of the screw body 5 to be threadedly connected with the motor shaft 2. The upper and lower end surfaces of the rotation limiting portion 6 are both flat, and the rotation limiting portion 6 is matched with a ferrule of the same shape, so that the screw 1 has a good rotation limiting effect.

[0032] Preferably, the screw rod body 5 is provided with a through hole 8 running through its length direction, the connecting rod 3 passes through the through hole 8 and the rear end of the connecting rod 3 is exposed outside the through hole 8; the rear end of the connecting rod 3 is provided with a nut 9, and the nut 9 is in contact with the rear end of the screw rod body 5; through the above manner, the overall connection fixity between the connecting rod 3 and the screw rod 1 is relatively stable, thereby more stably realizing the transmission effect of the utility model.

[0033] Preferably, the connecting rod 3 includes a connecting rod body 10 and a mounting portion 11, the mounting portion 11 is arranged at the front end of the connecting rod body 10, the connecting rod body 10 passes through the through hole 8 and the rear end of the connecting rod body 10 is exposed outside the through hole 8, the rear end of the valve core 4 is provided with a mounting hole 12 along its length direction, and the mounting portion 11 is inserted into the mounting hole 12 to achieve a stable connection between the connecting rod 3 and the valve core 4. Further, the connecting rod body 10 is provided with a protrusion 13 near the mounting portion 11, and the front end of the protrusion 13 is provided with a limiter 14, and the rear end of the valve core 4 is in contact with the limiter 14 to achieve the limit of the valve core 4. In addition, the overall length of the connecting rod 3 of the utility model can be specifically 35.9 mm. Compared with the traditional connecting rod with an overall length of 22.8 mm, the concentricity tolerance release bias of the connecting rod 3 of the utility model is reduced.

[0034] In addition, a sealing ring 15 and a sealing ring 16 are sleeved on the motor shaft 2 to improve the sealing effect of the utility model.

[0035] Compared with the prior art, the present invention provides a new screw connection structure, which has the following beneficial effects: (1) The overall length of the new screw connection structure of the present invention is not more than 130 mm, preferably 124.6 mm. Compared with the traditional screw connection structure, the overall length of the screw connection structure is shortened to reduce the space occupied by the screw connection structure, thereby reducing the overall volume of the hydraulic valve and saving costs; (2) The concentricity tolerance of the connecting rod of the present invention releases a reduced bias force, so that its processing requirements can be relaxed, the yield rate is improved, the cost is reduced, the radial bias force of the moving part (valve core) is reduced, and the service life is increased.

[0036] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new screw rod connection structure, characterized in that: include: A screw rod, a motor shaft, a connecting rod and a valve core, wherein the motor shaft is provided with an internal thread, the screw rod is connected to the internal thread of the motor shaft, the connecting rod is fixedly connected to the screw rod, the rear end of the valve core is fixedly connected to the front end of the connecting rod, the overall length of the novel screw rod connection structure is not more than 130 mm, and the overall length of the connecting rod is specifically 35.9 mm.

2. The novel screw rod connection structure according to claim 1 is characterized in that: The overall length of the novel screw rod connection structure is 124.6 mm.

3. The novel screw rod connection structure according to claim 1 is characterized in that: The screw rod comprises a screw rod body and a rotation limiting portion, wherein the rotation limiting portion is arranged at the front end of the screw rod body, and an external thread is arranged between the rotation limiting portion and the rear end of the screw rod body.

4. The novel screw rod connection structure according to claim 3 is characterized in that: The screw rod body is provided with a through hole penetrating the screw rod body in the length direction thereof, the connecting rod passes through the through hole and the rear end of the connecting rod is exposed outside the through hole.

5. The novel screw rod connection structure according to claim 4 is characterized in that: A nut is provided at the rear end of the connecting rod, and the nut is in contact with the rear end of the screw rod body.

6. The novel screw rod connection structure according to claim 5 is characterized in that: The connecting rod comprises a connecting rod body and a mounting portion, wherein the mounting portion is arranged at the front end of the connecting rod body, the connecting rod body passes through the through hole and the rear end of the connecting rod body is exposed outside the through hole.

7. The novel screw rod connection structure according to claim 6 is characterized in that: The rear end of the valve core is provided with a mounting hole along its length direction, and the mounting portion is inserted into the mounting hole.

8. The novel screw rod connection structure according to claim 7 is characterized in that: The connecting rod body is provided with a protrusion near the mounting portion, the front end of the protrusion is provided with a limit piece, and the rear end of the valve core is in contact with the limit piece.

9. The novel screw rod connection structure according to claim 1 is characterized in that: A sealing ring and a sealing ring are sleeved on the motor shaft.

Images