Reciprocating movement movement mechanism

Abstract

The present invention discloses a reciprocating movement movement mechanism, which includes a motor assembly and a slider assembly that are drivingly connected. An eccentric shaft is provided on the main shaft of the motor assembly. The slider assembly includes a pin shaft and a sliding block. The sliding block is circumferentially fixed and axially slidable with respect to the pin shaft. The sliding block is provided with a sliding groove that cooperates with the eccentric shaft. The eccentric shaft rotates with the main shaft to reciprocally slide along the sliding groove, and drives the sliding block to reciprocally move along the axis of the pin shaft. The central bracket of the movement mechanism of the present invention serves both as a component of the motor assembly and as a mounting seat for the slider assembly. The combination degree of the motor assembly and the slider assembly is high. Therefore, the overall structure is more compact, the assembly precision is high, it is not easy to loosen, and the failure rate is low. Moreover, the motor assembly and the slider assembly are integrated in the same housing, so the sealing performance is good, and it can effectively prevent sundries from entering the interior of the movement mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of small appliances, and particularly relates to a reciprocating movement movement mechanism. Background Art

[0002] The reciprocating working head is very common in small appliances, such as hair clippers and reciprocating shavers in personal care products, the reciprocating fists of dolls in toys, and also the fascia guns in rehabilitation tools, etc. And the power source of small appliances is mostly a motor, so a special transmission mechanism is required to realize the conversion between circular motion and linear reciprocating motion.

[0003] The cam-slider mechanism is a classic mechanism dedicated to the conversion between circular motion and linear reciprocating motion. However, the existing cam-slider mechanism has the following defects: (1) The slider needs to consider the assembly processability, so the mating accuracy of the slider itself is limited; (2) The slider is directly connected to the working head, and it is difficult to seal between the two, and sundries easily enter the assembly place of the slider. The above defects will cause abnormalities in the slider part, and may further cause problems such as unstable operation, large noise, large load and short service life. Summary of the Invention

[0004] In order to overcome the defects of the existing mechanism for converting circular motion and linear reciprocating motion, the present invention provides a reciprocating movement movement mechanism.

[0005] Preferably, the motor assembly has a central bracket, and the main shaft and the pin shaft are both installed on the central bracket.

[0006] Preferably, the motor assembly and the slider assembly are integrated in the same housing.

[0007] Preferably, the motor assembly is equipped with a front housing, a central waist hole is provided on the end wall of the front housing, the sliding block has an extension part extending out of the central waist hole, and a limiting surface that fits with the plane hole wall of the central waist hole is provided on the extension part.

[0008] Preferably, a sliding output shaft extending out of the central waist hole is fixed on the sliding block, the slider assembly further includes a flexible sealing bowl, the sealing bowl has a central sealing hole, the bowl mouth of the sealing bowl fits with the end wall of the front housing, and the sliding output shaft passes through the central sealing hole and is tightly fitted.

[0009] Preferably, the sliding block is an injection molded part, and the sliding output shaft is a metal insert.

[0010] Preferably, the pin shaft and the main shaft are skew and perpendicular; the sliding block has a lug, and a pin hole for assembling with the pin shaft is provided on the lug.

[0011] Preferably, the sliding block has a supporting piece, and a supporting table surface is correspondingly provided on the central bracket. The lug and the supporting piece are arranged on both sides of the sliding block; when the supporting piece contacts the supporting table surface, the extension part is aligned with the central waist hole.

[0012] Preferably, the motor assembly includes a stator and a rotor. The stator is composed of a rear end cover, a central bracket, a front housing and a permanent magnet. The rotor is composed of a main shaft, a coil, a rear bearing and a front bearing.

[0013] Preferably, the main shaft is parallel to the eccentric shaft and welded into one body; a fitting notch is provided at the welding coincidence part of the main shaft and the eccentric shaft.

[0014] The present invention has the following beneficial effects:

[0015] 1. The motor assembly directly drives the slider assembly to reciprocate linearly through the eccentric shaft, with few components and a simple structure. Therefore, the product has a compact appearance and a low failure rate.

[0016] 2. The sliding block is matched with the pin shaft. The sliding block has good matching accuracy and can slide smoothly. Therefore, the noise is small and the power consumption is low.

[0017] 3. Both the main shaft and the pin shaft are positioned and installed through the central bracket. Therefore, the installation consistency of the eccentric shaft and the sliding block is good, the assembly accuracy is also high, and it is not easy to loosen.

[0018] 4. The central bracket serves both as a component of the motor assembly and as a mounting seat for the slider assembly. The motor assembly and the slider assembly are highly integrated, and the overall structure of the movement is more compact and not prone to failure.

[0019] 5. The motor assembly and the slider assembly are integrated in the same housing, and the sealing bowl outside the housing can automatically adjust with the sliding of the sliding output shaft, with good sealing performance, which can effectively prevent sundries from entering the interior of the movement. Description of the Drawings

[0020] Figure 1 is a three-dimensional schematic diagram of an embodiment of the present invention.

[0021] Figure 2 is an exploded schematic diagram of an embodiment of the present invention.

[0022] Figure 3 is a cross-sectional schematic diagram of an embodiment of the present invention (the sliding output shaft is in the center).

[0023] Figure 4 is a cross-sectional schematic diagram of an embodiment of the present invention (the sliding output shaft is offset).

[0024] Figure 5 is a three-dimensional schematic diagram of the sliding block in an embodiment of the present invention.

[0025] Figure 6 2 is a schematic cross-sectional view of a sliding block in an embodiment of the present invention.

[0026] Figure 7 It is a schematic diagram of the assembly process of the sliding block and the central support in an embodiment of the present invention.

[0027] Figure 8 It is a schematic diagram of the assembly process of the main shaft and the eccentric shaft in an embodiment of the present invention.

[0028] Motor assembly 100, main shaft 101, eccentric shaft 102, center bracket 103, front housing 104, center waist hole 105, support table 106, rear end cover 107, permanent magnet 108, coil 109, rear bearing 110, front bearing 111, fitting notch 112; slider assembly 200, pin shaft 201, sliding block 202, slide groove 203, extension 204, limiting surface 205, sliding output shaft 206, sealing bowl 207, central sealing hole 208, support ear 209, pin hole 210, support plate 211. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the embodiments and drawings.

[0030] In the embodiment, Figures 1 to 8 As shown, a reciprocating movement includes two major parts: a motor assembly 100 and a slider assembly 200 that are transmission-connected, and is used to achieve circular motion and linear reciprocating motion.

[0031] Specifically, Figures 2 to 4 As shown, the motor assembly 100 is similar to a common motor, and includes two parts, a stator and a rotor. The stator is composed of a rear end cover 107, a center support 103, a front housing 104 and a permanent magnet 108, and the rotor is composed of a main shaft 101, a coil 109, a rear bearing 110 and a front bearing 111. The main shaft 101 is supported and mounted on the rear end cover 107 and the center support 103 through the rear bearing 110 and the front bearing 111. In particular, the front end of the main shaft 101 is welded with a parallel eccentric shaft 102 as a connecting transmission component with the slider assembly 200.

[0032] The slider assembly 200 is as follows Figures 2 to 5 As shown, it is mainly composed of a pin shaft 201, a sliding block 202 and a sliding output shaft 206. Among them, the sliding output shaft 206 is used as the installation part of the working head of the small appliance. The sliding block 202 is fixed to the pin shaft 201 in the circumferential direction and slides in the axial direction. The sliding block 202 is provided with a sliding groove 203 for matching with the eccentric shaft 102. When the eccentric shaft 102 rotates with the main shaft 101, it will slide back and forth along the folding sliding groove 203, and correspondingly, it will drive the sliding block 202 to reciprocate along the axis of the pin shaft 201. In particular, the pin shaft 201 is limitedly installed on the central bracket 103.

[0033] In the above structure of this embodiment: The motor assembly 100 directly drives the slider assembly 200 to reciprocate linearly through the eccentric shaft 102, with few components and a simple structure; the slider 202 cooperates with the pin shaft 201, and the slider 202 has good fitting accuracy and can slide smoothly; both the main shaft 101 and the pin shaft 201 are positioned and installed through the central support 103. The installation consistency between the eccentric shaft 102 and the slider 202 is good, the assembly accuracy is high, and it is not easy to loosen; the central support 103 serves as both a component of the motor assembly 100 and a mounting base for the slider assembly 200. Therefore, overall, the power unit (motor assembly 100) and the transmission unit (slider assembly 200) of the movement of this embodiment are highly integrated in terms of function and structure, with a compact structure and high assembly accuracy. Therefore, it has the advantages of a small product size, low noise, low energy consumption, and low failure rate.

[0034] In the embodiment, the slider 202 slides only by using a pin shaft 201 with a circular cross-section. The advantage is that the number of components is reduced and the requirement for fitting accuracy is lowered. Therefore, it is convenient for processing and assembly, and the movement of the slider 202 is also smoother. However, with this structure, the slider 202 can rotate around the pin shaft 201, and the degree of freedom of the slider 202 must be limited. Specifically, as Figure 2 、 5 shown, the motor assembly 100 is equipped with a front housing 104. The end wall of the front housing 104 is provided with a central waist-shaped hole 105. The slider 202 has an extension 204 extending from the central waist-shaped hole 105, and the extension 204 has a limiting surface 205 that fits against the planar hole wall of the central waist-shaped hole 105. In this embodiment, the cooperation of the central waist-shaped hole 105 and the limiting surface 205 limits the slider 202 to only reciprocate linearly. This mechanism has the advantages of a simple structure and convenient installation of the slider 202. Here, the front housing 104 also serves as the outer housing of both the motor assembly 100 and the slider assembly 200, integrating the two in the same housing, improving the integrity and sealing performance of the movement.

[0035] In the embodiment, as Figures 1 to 4 shown, the slider assembly 200 further includes a flexible sealing bowl 207. The sealing bowl 207 has a central sealing hole 208. The mouth of the sealing bowl 207 fits against the end wall of the front housing 104, and the sliding output shaft 206 passes through the central sealing hole 208 and is tightly fitted. In this embodiment, the externally arranged sealing bowl 207 can automatically adjust with the sliding of the sliding output shaft 206 ( Figure 4 in which the sealing bowl 207 undergoes elastic deformation), with good sealing performance, and can effectively prevent foreign objects from entering the interior of the movement. Here, the sealing bowl 207 is an elastically deformable bowl-shaped sealing cover, which can be made of materials such as rubber, and the cross-sectional shape is as Figure 3 shown.

[0036] In the embodiment, asFigure 6 As shown, the sliding block 202 is an injection molded part, and the sliding output shaft 206 is a metal insert. In the process of this embodiment, the sliding block 202 and the sliding output shaft 206 are fixed as one body, and the structure is stable; the sliding output shaft 206 can be made of stainless steel to improve corrosion resistance, so as to be suitable for personal care products that are often in contact with water.

[0037] In the embodiment, Figure 2 As shown, the pin 201 is skewed and perpendicular to the main shaft 101. Specifically, the sliding block 202 has a lug 209, and the lug 209 is provided with a pin hole 210 assembled with the pin 201. In this embodiment, the pin 201 is staggered with the main shaft 101, which is convenient for setting the slide groove 203, and the angle setting of the sliding output shaft 206 is also more flexible, which can be selected to be parallel to the main shaft 101, or form a certain angle, so as to be suitable for small appliances with different functions.

[0038] In the embodiment, Figure 7 As shown, the sliding block 202 has a supporting piece 211, and the central support 103 is correspondingly provided with a supporting table 106, and the ears 209 and the supporting piece 211 are arranged on both sides of the sliding block 202; when the supporting piece 211 contacts the supporting table 106, the extension 204 is aligned with the central waist hole 105. The supporting piece 211 of this embodiment mainly plays a role in assembly. After the central support 103 is erected, the pin 201 and the sliding block 202 are installed. The supporting piece 211 naturally aligns the sliding block 202 and the extension 204 upwards with the central waist hole 105, and the front housing 104 can be easily assembled from top to bottom.

[0039] In the embodiment, in order to facilitate the welding of the main shaft 101 and the eccentric shaft 102, a fitting notch 112 is provided at the welding overlapped portion of the main shaft 101 and the eccentric shaft 102 to ensure sufficient contact area and ensure welding stability. Figure 8 In the embodiment, the fitting notch 112 is provided on the eccentric shaft 102 ; similarly, the fitting notch 112 may also be provided on the main shaft 101 , or a part of the main shaft 101 and the eccentric shaft 102 may be provided respectively.

[0040] Obviously, the above embodiments of the present invention are only examples for explaining the present invention, and are not intended to limit the implementation methods of the present invention. Other obvious changes or modifications derived from the essence of the present invention still fall within the protection scope of the present invention.

Claims

1. A reciprocating movement movement mechanism, comprising a motor assembly (100) and a slider assembly (200) which are in transmission connection, characterized in that: An eccentric shaft (102) is arranged on the main shaft (101) of the motor assembly (100). The slider assembly (200) includes a pin shaft (201) and a slider (202). The slider (202) is circumferentially fixed and axially slidable with respect to the pin shaft (201). The slider (202) is provided with a chute (203) for cooperating with the eccentric shaft (102); The eccentric shaft (102) rotates with the main shaft (101) to reciprocally slide along the chute (203), and drives the slider (202) to reciprocally move along the axis of the pin shaft (201); The motor assembly (100) has a central bracket (103), and both the main shaft (101) and the pin shaft (201) are installed on the central bracket (103); The motor assembly (100) is equipped with a front housing (104). A central waist-shaped hole (105) is provided on the end wall of the front housing (104). The slider (202) has an extension part (204) extending from the central waist-shaped hole (105). A limiting surface (205) that fits against the planar hole wall of the central waist-shaped hole (105) is provided on the extension part (204); The pin shaft (201) and the main shaft (101) are non-coplanar and perpendicular; the slider (202) has a lug (209), and a pin hole (210) for assembling with the pin shaft (201) is provided on the lug (209); The slider (202) has a support piece (211). A support table surface (106) is correspondingly provided on the central bracket (103). The lug (209) and the support piece (211) are arranged on both sides of the slider (202); when the support piece (211) contacts the support table surface (106), the extension part (204) is aligned with the central waist-shaped hole (105).

2. The reciprocating movement movement mechanism according to claim 1, characterized in that, The motor assembly (100) and the slider assembly (200) are integrated in the same housing.

3. The reciprocating movement movement mechanism according to claim 1, characterized in that, A sliding output shaft (206) extending from the central waist-shaped hole (105) is fixed on the slider (202). The slider assembly (200) further includes a flexible sealing bowl (207). The sealing bowl (207) has a central sealing hole (208). The bowl mouth of the sealing bowl (207) fits against the end wall of the front housing (104), and the sliding output shaft (206) passes through the central sealing hole (208) and is tightly fitted.

4. The reciprocating movement movement mechanism according to claim 3, characterized in that, The slider (202) is an injection-molded part, and the sliding output shaft (206) is a metal insert.

5. The reciprocating movement movement mechanism according to any one of claims 1 to 2, characterized in that, The motor assembly (100) includes a stator and a rotor. The stator is composed of a rear end cover (107), a central bracket (103), a front housing (104), and a permanent magnet (108). The rotor is composed of a main shaft (101), a coil (109), a rear bearing (110), and a front bearing (111).

6. The reciprocating movement movement mechanism according to any one of claims 1 to 2, characterized in that, The main shaft (101) is parallel to the eccentric shaft (102) and welded into one body; a fitting notch (112) is provided at the welding overlap portion of the main shaft (101) and the eccentric shaft (102).

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