Drive mechanism and massager

Abstract

A drive mechanism for a massager, comprising a drive motor, a transmission unit, a limit bracket, and a plurality of movable push blocks; wherein each movable push block comprises a movement slot and a push section; wherein the transmission unit comprises a plurality of eccentric joints, each eccentric joint comprising a connecting portion and an eccentric portion, the connecting portion being configured to connect adjacent eccentric joints to each other, and the eccentric portion abutting the movement slot; wherein a rotation shaft of the drive motor is defined as the first rotation axis; wherein a point of the eccentric section furthest from the first axis of rotation is defined as the furthest eccentric end, and a connecting line between adjacent furthest eccentric ends forms a non-zero first included angle with the first axis of rotation; wherein the limit bracket is slidably connected to the movable push blocks, and the sliding movement direction of the movable push blocks is parallel to the width direction of the movement slot.

Description

TECHNICAL FIELDThe present invention relates to a driving mechanism and a massager.BACKGROUNDCurrently, the drive mechanism of peristaltically operating massagers bends the interconnected surrounding skeletal structures by a curved displacement motion, thereby enabling the massage head to flex.Such a drive mechanism requires a comparatively long skeletal structure to avoid interference with adjacent joints during oscillation. However, too long a massage head cannot be completely inserted into the human body. Therefore, in the prior art, only a part of the massage head inside the human body can execute a slight peristaltic movement, resulting in only a slight massage effect.CONCRETE EMBODIMENTSThe present invention provides a drive mechanism for a massage apparatus, including a drive motor, a transmission unit, a restriction bracket, and a plurality of movable push blocks.The movable pushing blocks are provided with a moving slot and a pushing portion.The transmission unit includes a plurality of eccentric joints each having a connecting portion and an eccentric portion. The connecting portion serves for connecting adjacent eccentric joints, and the eccentric portion abuts against the movement slot.The rotation shaft of the driving motor is defined as a first rotation axis.The point of the eccentric portion furthest from the first axis of rotation is defined as the distal eccentric end, and a connecting line between two adjacent distal eccentric ends forms a non-zero first inclusion angle with the first axis of rotation.The limit bracket is slidably connected to the movable push blocks, and the sliding direction of the movable push blocks is parallel to the width direction of the moving slot.There is further provided a massage device comprising the above-mentioned driving mechanism, a housing and a silicone outer layer. The driving motor and the restriction bracket are fixedly connected to the housing, and the pushing portion of the movable pushing blocks abuts against an inner wall surface of the silicone outer layer.The advantageous effect of the present invention is that by using the drive mechanism disclosed herein a peristaltic massage effect with a shorter skeletal structure - i.e. with fewer movable push blocks - can be achieved, thereby making it possible to fully insert the massage head into the human body.BRIEF DESCRIPTION OF THE DRAWINGSFIG. 1 is a schematic structural perspective view of the drive mechanism provided by the present invention. FIG. 2 is a schematic front sectional view of the drive mechanism provided by the present invention. FIG. 3 is a schematic view of the connection structure between the transmission unit and the movable thrust blocks according to the present invention. FIG. 4 is a perspective schematic structural view of the limiting bracket provided by the present invention. FIG. 5 is a schematic structural perspective view of another embodiment of the drive mechanism provided by the present invention. FIG. 6 is a schematic structural perspective view of an embodiment of the transfer unit provided by the present invention. FIG. 7 is a schematic structural perspective view of another embodiment of the transfer unit provided by the present invention. FIG. 8 is a schematic diagram of a preset angle of the eccentric portion. FIG. 9 is a schematic diagram of the inclusion angle α. FIG. 10 is a perspective schematic structural view of a drive mechanism including a rotary function module. FIG. 11 is a perspective schematic structural view of a drive mechanism including a telescopic function module. FIG. 12 is a schematic structural perspective view of the drive mechanism illustrated in Embodiment 3. FIG. 13 is a perspective schematic structural view of the end portion of the limiting bracket hidden driving mechanism illustrated in FIG. 11. FIG. 14 is a schematic diagram showing the connection relationship between the guide rod and the second guide slide groove in Embodiment 3. FIG. 15 is a schematic diagram showing another connection relationship between the guide rod and the second guide slide groove in Embodiment 3. FIG. 16 is a schematic structural perspective view of a driving mechanism including a guide rod in another embodiment. FIG. 17 is a schematic diagram showing the connection relationship between the guide rod and the second guide slide groove in the drive mechanism shown in FIG. 16. FIG. 18 is a schematic structural view of a massage device provided by the present invention.DETAILED DESCRIPTION OF PREFERRED EMBODIMENTSEmbodiment 1See FIGS. 1 to 17.A drive mechanism for a massage device is provided, including a drive motor 1, a transmission unit 2, a restriction bracket 3, and a plurality of movable push blocks 4.The movable push block 4 includes a push portion 41 and a moving slot 42.The transmission unit 2 includes a plurality of eccentric joints each having a connection portion 22 and an eccentric portion 21. The connecting portion 22 serves for connecting adjacent eccentric joints, and the eccentric portion 21 abuts against the movement slot 42.The rotation shaft of the driving motor 1 is defined as the first rotation axis 11.For each eccentric portion 21, the point furthest from the first axis of rotation 11 is referred to as the distal eccentric end 212. A connecting line between adjacent furthest eccentric ends 212 forms a non-zero first inclusion angle with the first rotation axis 11.The limit bracket 3 is slidably connected to the movable push block 4, and the sliding direction of the movable push block 4 is parallel to the width direction of the moving slot 42.The long wall surface of the moving slot 42 refers to the wall surface defined by two long sides, and the wide wall surface refers to the wall surface defined by two short sides.Currently, a type of peristaltic massage device has appeared on the market. The massage head of such a device can move in a creep manner like a coil. The long, rod-shaped massage head has sections along its length that alternately swing out on both sides and thus form an approximately S-shape.Such a massage device can adapt itself better to the body contours during the peristaltic movement and thus achieve a more comprehensive massage effect. The drive mechanism used for this purpose comprises a spiral shaft which is guided through a skeleton frame comprising a plurality of articulated supporting units. Each support unit has an elongated slot. When the spiral shaft is connected to the motor, certain points along the shaft are inevitably deviated from the rotation axis of the motor. During rotation, these points press against the wall surface of the elongated slot along the longitudinal direction, causing relative rotation between adjacent support units. The support units oscillate reciprocally in a certain pattern, thus creating a serpentine peristaltic movement.Such a vibrating mechanism, based on support units, requires a sufficient number of support units to achieve a complete S-shaped peristaltic action. As a result, the entire massage device is relatively long and is difficult to fully insert into the human body. Moreover, when functional modules 8 are added at the end of the massage head, the apparatus continues to extend. Therefore, in the existing drive structures, it is difficult to integrate additional functional modules 8 at the end. More specifically, a peristaltic massager with end modules 8 will be even more difficult to insert deeply into the human body.The present application discloses a drive mechanism for a massage device, wherein the drive motor 1 is fixedly connected to the housing of the massage device. The drive motor 1 mainly drives the rotation of the transmission unit 2. The main shaft of the driving motor 1 may be connected to a reduction gear 6 to reduce the rotational speed of the motor and generate a higher torque, thereby preventing excessive stimulation and preventing jamming of the massage head.The transmission unit 2 is connected to and rotates together with the output shaft of the reduction gear 6. As shown in Figs. 6 to 9, the transmission unit 2 comprises eccentric portions 21 which are offset from each other.As already mentioned, prior art massage devices use a helical shaft in which each portion of the shaft merges in a smooth manner along its length. In contrast, the transmission unit 2 of the present application functionally corresponds to the prior art helical shaft, but is structurally distinct because it has a stepwise offset between the sections rather than a flowing transition.In the present application, a helical shaft is no longer used as the transmission unit 2. Instead of the support units articulated beforehand, movable thrust blocks 4 are used, which are slidably arranged inside the limiting bracket 3. In the prior art, the hinge mechanism corresponds to a rotational movement, while the sliding guide in the present application causes a translatory movement. In this connection, the direction of displacement of the movable pushing blocks 4 is perpendicular to the axial direction of the transmission unit 2.When a force is applied to the movable pushing blocks 4 in a direction parallel to the axis of the transmission unit 2, the pressure between adjacent pushing blocks 4 or between pushing blocks 4 and the restriction bracket 3 inevitably increases.In contrast, in the prior art, the force on the spiral shaft acts at an angle so that although it drives the thrust blocks 4 in a direction perpendicular to the axis of the spiral (which corresponds to the desired direction of movement), it also generates (undesirable) a component of force in the axial direction, which can result in lower operating efficiency.As shown in FIGS. 8 and 9, the rotation shaft of the drive motor 1 serves as a rotation axis. The outer contour of the eccentric section 21 has a plurality of points at different distances from the drive motor 1. Among these points are those furthest from the motor and referred to as furthest eccentric ends 212. During the rotation of the transmission unit 2 effected by the drive motor 1, a cylindrical movement space is formed which represents the maximum range which the transmission unit 2 can cover. The furthest eccentric ends 212 define the lateral surface of this cylindrical movement space.As shown in FIGS. 1 and 2, the movable push block 4 includes a moving slot 42 and a push portion 41. the end of the push portion 41 radially protrudes from the circumferential profile of the limit bracket 3 and directly abuts on the inner wall surface of the silicone outer layer 7 of the massager, thereby generating a massage force exerting pressure. The central portion of the push block 4 is provided with the moving slot 42. The length L1 of the moving slot 42 is significantly larger than the width L2 thereof, and the width direction of the moving slot 42 is parallel to the direction in which the pushing portion 41 protrudes from the restriction bracket 3.The eccentric portion 21 is disposed within the travel slot 42 with the farthest eccentric end 212 abutting a wall surface of the travel slot 42. Each eccentric section 21 is assigned a corresponding thrust block 4. When the farthest eccentric end 212 rotates in a plane coincident with the width direction of the moving slot 42, it abuts one of the long wall surfaces of the moving slot 42 (defined by the two long sides). In this state, the thrust block 4 is displaced up to its maximum stroke. The moving slot 42 has long wall surfaces on both sides, so that the pushing block 4 is displaced in opposite directions when abutting against different sides.As the farthest eccentric end 212 rotates in a plane that coincides with the longitudinal direction of the travel slot 42, it approaches the wide panels (defined by the two short sides) of the travel slot 42. Thus, when the furthest eccentric end 212 is located in the longitudinal direction plane of the slot, the thrust block 4 is displaced only minimally or not at all.Specifically, the length L 1 and the width L 2 of the moving slot 42 and the distance L 3 between the farthest eccentric end 212 and the first rotation axis 11 are related to: the width L 2 of the slot must be at least large enough to accommodate and allow the eccentric portion 21 to move. The smallest possible distance between the eccentric portion 21 and the movement slot 42 reduces impact noises and improves the smoothness of running of the thrust block 4.The length L1 of the travel slot 42 should be greater than the diameter of the cylindrical travel space defined by the path of the farthest eccentric end 212 to provide sufficient clearance for the eccentric travel. Therefore, the condition 0.5 × L1 ≥ L3 should be satisfied so that the pushing block 4 remains centered when the rotation axis rotates in a plane parallel to the longitudinal direction of the moving slot 42 and does not shift in one direction.Further, as shown in FIG. 8, when viewed from a vertical plane directed to the drive motor 1, the farthest eccentric ends 212 of adjacent eccentric portions 21 are disposed at a preset angular distance from each other. In this arrangement, the connecting line between adjacent farthest eccentric ends 212 (these referring to different eccentric portions 21, not the same) forms a non-zero first inclusion angle with the drive motor 1. in other words, the farthest eccentric ends 212 of adjacent eccentric portions 21 do not lie on a common straight line, and the connecting line between them does not run parallel to the rotational axis of the drive motor 1.As a result, when the farthest eccentric end 212 of one eccentric portion 21 abuts the long wall surface of the associated moving slot 42 (i.e., presses the pushing block 4 to its outermost position), the adjacent farthest eccentric end 212 does not contact the long wall surface of its respective moving slot 42. Consequently, the adjacent pushing blocks 4 together form an S-shaped arc. The specific position of each thrust block 4 is determined by the distance between the furthest eccentric end 212 and the first axis of rotation 11.Accordingly, the present embodiment provides an optimized arrangement of the eccentric portions 21. As shown in FIG. 8, each farthest eccentric end 212 of an eccentric portion 21 is disposed at an equal distance from the first rotation axis 11, and adjacent eccentric ends 212 are distributed at predetermined angular intervals around the first rotation axis 11.For example, the preset angle interval is 60 degrees. The first farthest eccentric end 212 is at 0 degrees, the second at 60 degrees, and the third at 120 degrees. In this configuration, when the first eccentric end 212 maximally displaces the first thrust block 4, the second thrust block 4 is displaced in the same direction but to a lesser extent. The third thrust block 4 is displaced in the opposite direction, but with the same amplitude as the second.When the drive motor 1 starts rotating the transmission unit 2, the first eccentric end 212 moves to the 60 degree position, the second to the 120 degree position, and the third to the 180 degree position. At this time, the third pushing block 4 reaches its maximum displacement but in the opposite direction to the original displacement of the first pushing block 4.In this way, during the rotation of the transmission unit 2, the angular position of a preceding eccentric end 212 is continuously replaced by that of the respective next one. This allows each pusher block 4 to be displaced in sequence to the same extent, thereby creating a serpentine peristaltic movement.Further, as shown in FIGS. 1 and 4, the restriction bracket 3 needs to restrict the degrees of freedom of the thrust block 4 to prevent the thrust block 4 from co-rotating with the eccentric portion 21. The restriction bracket 3 is provided with a first guide slide groove 31 whose depth direction is parallel to the width direction of the moving slot 42.The end of the thrust portion 41 protrudes from the circumferential profile of the restriction bracket 3 in the depth direction of the first guide slide groove 31 and also extends in this direction.When the farthest eccentric end 212 presses one of the long wall surfaces of the moving slot 42, the corresponding pushing portion 41 on the same side applies pressure to the human skin to achieve a massage effect.As shown in FIGS. 1, 10, and 11, the both ends of the limiting bracket 3 in the longitudinal direction are defined as a first link 33 and a second link 34. These are connected by a plurality of connecting arms 35 which are arranged annularly around the main axis of the drive motor 1.The spaces between adjacent link arms 35 form the first guide slide grooves 31.The longitudinal direction of each first guide slide groove 31 is parallel to the longitudinal direction of the limiting bracket 3, and the width of the gaps defines the width direction of the respective guide slide groove 31.The limiting bracket 3 consists of the first connecting element 33, the second connecting element 34 and a plurality of connecting arms 35. One end of each link arm 35 is connected to the first link member 33 and extends along the main axis of the driving motor 1, while the other end is connected to the second link member 34.The spaces between adjacent link arms 35 serve as first guide slide grooves 31. the direction along the length of the bracket is defined as the longitudinal direction of the first guide slide groove 31, and the direction of the spaces as the width direction of the guide slide groove 31.As shown in FIG. 5, the link arms 35 constitute a total of four first guide slide grooves 31.At this time, two non-adjacent first guide slide grooves 31 are combined as one group. The depth directions of the first guide slide grooves 31 within the same group are parallel to each other, while the depth directions of guide slide grooves 31 of different groups are perpendicular to each other.The orientation of the moving slot 42 of each adjacent movable pushing block 4 is oriented perpendicular to the orientation of the next one, and the pushing portions 41 of adjacent movable pushing blocks 4 are respectively arranged in different groups of the first guide slide grooves 31.The four first guide slide grooves 31 are formed by at least four link arms 35 arranged in a circumferential arrangement about the axis of the drive motor 1. This arrangement results in four identical first guide slide grooves 31, the depth directions of adjacent grooves being perpendicular to each other and the opposing grooves having parallel depth directions. The parallel depth direction guide slide grooves 31 are grouped together.The orientations of adjacent movable pushing blocks 4 are different from each other. The longitudinal directions of the moving slots 42 of adjacent push blocks 4 are perpendicular to each other. Accordingly, the movement directions of adjacent thrust blocks 4 also extend perpendicular to each other. This allows the mechanism to perform peristaltic movements in two planes and thus achieve a more comprehensive massage effect.As described in Embodiment 1, the prior art structure is composed of a plurality of hinged support units, each support unit having to swing simultaneously. The pivot angle of a subsequent support unit must absorb the deflection of the preceding ones in order to avoid interference. As a result, each support unit is limited to one plane of oscillation. For example, support units moving in the horizontal direction may not swing vertically simultaneously.In the present embodiment, two groups of first guide slide grooves 31 are provided. The guide strokes of these two groups run perpendicular to one another. The longitudinal direction of the movement slot 42 of a movable thrust block 4 merely has to run parallel to the guiding stroke of one of the groups. Adjacent thrust blocks 4 are arranged in different groups of first guide slide grooves 31.There is no structural difference between the movable pusher blocks 4 in the two groups of first guide slide grooves 31; the movement is further effected by pushing the furthest eccentric end 212 against the long wall surface of the respective movement slot 42; this allows peristaltic movement in two directions, resulting in a more comprehensive massage effect.Embodiment 2The connecting portion 22 is a cylindrical structure, and the eccentric portion 21 is fixedly disposed along the axial direction of the connecting portion 22.The present embodiment provides a specific structural shape of the transmission unit 2 in which the connection portion 22 is a cylindrical structure that may be formed as either a cylinder or a prism. The connecting portion 22 may be disposed coaxially with the drive motor 1, and the eccentric portion 21 may easily protrude from the axial wall surface of the connecting portion 22. In this embodiment, the transmission unit 2 can be formed as an integral injection-molded part, wherein each eccentric portion 21 and the associated segment of the connecting portion 22 are considered as a single eccentric component.Moreover, the eccentric portion 21 may also directly serve as a cam structure. In this case, the eccentric portions 21 are directly stacked, and the end surface of the eccentric portion 21 functions as the connecting portion 22.Embodiment 3See FIGS. 12 to 17.The present embodiment provides another specific structure configuration of the transmission unit 2. In particular, the eccentric portion 21 is formed as a cylindrical structure.The connecting portion 22 comprises two connecting pieces 221 which respectively connect adjacent eccentric portions 21 to one another.Each link 221 is formed as a non-rotationally symmetric structure, and the end of the eccentric portion 21 is inserted into and coupled to the link 221.The connecting portion 22 is provided with two connecting holes 221 that are not coaxially arranged, each connecting hole 221 having a non-rotating structure, for example, an elongated shape. After the eccentric portion 21 is inserted and coupled into the communication hole 221, a fixed relative angle is defined therebetween. This means that the relative angular positions of adjacent, most distant eccentric ends 212 are predetermined.This arrangement obviates the need to separately adjust the relative angle between adjacent farthest eccentric ends 212 during assembly. It is sufficient to directly insert the eccentric portion 21 into the communication hole 221 in order to realize the above-described optimum arrangement of the eccentric portions 21.Embodiment 4See FIGS. 10 and 11.The eccentric portion 21 furthest from the drive motor 1 is defined as the first eccentric portion 211. The first eccentric portion 211 is rotatably connected to the limiting bracket 3 and is coaxially aligned with the driving motor 1.The first eccentric portion 211 is connected to the limiting bracket 3, and the transmission unit 2 is supported by the limiting bracket 3. This effectively prevents tilting of the transmission unit 2 and improves the overall stability of the transmission unit 2.Moreover, the end of the first eccentric portion 211 is connected to a functional module 8. The functional module 8 may be a vibration module that allows the massage head to generate vibrations.The functional module 8 can also be designed as a telescopic functional module 8, wherein the first eccentric section 211 serves as a spindle of a conventional telescopic mechanism. For example, the telescopic mechanism comprises an output shaft, a sliding bushing and a limiting sleeve. The first eccentric portion 211 is connected to the output shaft, the latter being provided with an inclined slide groove. The sliding bushing is mounted on the output shaft and provided with a ball which abuts against the side wall of the sliding groove. The limiting sleeve is firmly connected to the limiting holder 3 and surrounds the sliding bushing in order to prevent its rotation. The first eccentric portion 211 drives the output shaft to rotate, whereby the wall surface of the slide groove drives the slide bush to move.The functional module 8 can also be designed as a rotary functional module 8, wherein the first eccentric section 211 is connected to an output shaft which has a bending angle. The end of the output shaft is eccentrically connected to the first eccentric portion 211. When the first eccentric portion 211 rotates the output shaft, the end thereof describes a circular path about the axis of the first eccentric portion 211. The functional module 8 can also be designed as a pivoting functional module 8. The first eccentric portion 211 is connected to another eccentric portion 21. The functional module 8 comprises a pivot rod which is pivotably connected to the limiting holder 3. The eccentric portion 21 sets the pivot rod in a pivoting movement.Embodiment 5See Figure 1.A vibration motor 5 is disposed on the peripheral wall surface of the restriction bracket 3 or the pushing portion 41.In this embodiment, the vibration motor 5 is mounted on the peripheral wall surface, whereby the central portion of the massager is capable of generating vibrations. This is different from most conventional massage devices in which the vibration function is positioned at the front end. Vibration motors at the front end often do not efficiently transmit vibrations to the central portion of the massager. By disposing the vibration motor 5 on the peripheral wall surface of the restriction holder 3 or the push portion 41, the central portion can generate a remarkable vibration, which supplements peristaltic motion and improves massage effect.Depending on whether the vibration motor 5 is located in the restriction bracket 3 or the push portion 41, functional differences result. When the vibration motor 5 is located in the restriction bracket 3, the entire driving mechanism exhibits a relatively uniform vibrating action, and each thrust portion 41 undergoes vibration. When the vibration motor 5 is installed in a certain thrust portion 41, only the same exhibits a remarkable vibration effect. As the push portion 41 moves, the human body experiences a varying vibration sensation.Embodiment 6See FIGS. 12 to 17.A guide rod 32 is provided inside the restriction bracket 3, and the axial direction of the guide rod 32 is parallel to the first rotation axis 11.The movable pushing block 4 is provided with a second guide sliding groove 43 whose longitudinal direction is perpendicular to the width direction of the moving slot 42.The guide rod 32 passes through the second guide slide groove 43.The long wall surfaces on both sides of the second guide slide groove 43 abut on the guide rod 32. The interval between the short wall surfaces of the second guide slide groove 43 constitutes the slide gap for the guide rod 32, and the longitudinal direction of the second guide slide groove 43 is parallel to the width direction of the moving slot 42.This embodiment provides a novel structure for guiding and limiting the movable thrust block 4.Instead of the first guide slide groove 31 in the limit bracket 3, a guide rod 32 is inserted. The axis of the guide rod 32 is parallel to the engagement axis. The guide rod 32 can be designed as a cylinder, prism, rounded rectangular prism or elliptical column. In the push block 4, a second guide slide groove 43 is formed through which the guide rod 32 is passed so as to slide along the longitudinal direction of the groove.In the simplest configuration, the guide structure consists merely of a guide rod 32, one end of which is connected to the housing of the drive motor 1 and the other end of which is connected to the housing of the massage device. It should be noted that in the case of only one guide rod 32, this must not be cylindrical. When the movable slide block 4 tends to rotate, the guide rod 32 must simultaneously abut on both long wall surfaces of the second guide slide groove 43 to prevent the slide block 4 from rotating about the guide rod 32.For example, the guide rod 32 may be formed as a regular square prism, and the width of the second guide slide groove 43 is slightly larger than the side length of the cross section of the guide rod 32. The guide rod 32 can then be inserted into the second guide slide groove 43. Since the length of the groove is larger than its width, the guide rod 32 can move along the longitudinal direction of the guide slide groove 43 for a certain distance.The second guide slide groove 43 does not necessarily have to have two long and two short wall surfaces. One of the short wall surfaces may be omitted so that the guide rod 32 may slide outward in the longitudinal direction of the guide slide groove 43. Note that "coming out" does not mean that the guide rod 32 completely comes out - a part thereof should remain in the guide slide groove 43.In an ideal embodiment, two second guide slide grooves 43 and two corresponding guide rods 32 are provided. The grooves are disposed on both sides of the moving slot 42 in the width direction. When the push block 4 attempts to rotate, one of the guide rods 32 abuts one of the long wall surfaces of one groove while the other guide rod 32 abuts the opposite long wall surface of the other groove. This effectively prevents the rotation of the push block 4.In addition, the guide rod 32 is configured as a cylindrical structure. When the cylindrical circumferential wall abuts on the long wall surface of the second guide slide groove 43, the contact area is significantly smaller than other guide rod shapes. This reduces friction considerably and permits a more even sliding movement of the thrust block 4, with at the same time less noise being generated.Moreover, the guide rod 32 is rotatably connected to the restriction bracket 3. As a result, when the pushing block 4 is moved, rolling friction is generated between the groove 43 and the guide rod 32, which further reduces the sliding resistance.In addition, the pushing portion 41 is configured as an annular structure surrounding both the second guide slide groove 43 and the moving slot 42. In this embodiment, the restricting members are disposed inside the pushing block (i.e., the guide rod 32 is located inside the guide slide groove 43). The pushing portion 41, as an outermost member of the pushing block 4, abuts directly on the silicone outer layer 7 of the massager. Therefore, its shape largely affects the external shape of the massager. The annular structure of the thrust portion 41 uniformly supports the silicone outer layer 7 and provides comprehensive support.In addition, the circumference of the thrust portion 41 has an elliptical shape, and the major axis of the ellipse is parallel to the guiding direction. During operation, the push portion 41 presses against the silicone outer layer 7, which must deform. For a flexible layer such as the silicone outer layer 7, the smaller the pressed area, the easier the deformation. This means that, at constant force, a smaller contact surface generates a higher pressure. The ends of the main axis have a smaller curvature, so that the thrust section 41 acts with this flatter side on the silicone outer layer 7, as a result of which the latter can be deformed with less force being applied by the drive motor 1.The directed shape of the ellipse also allows the user to easily recognize the direction of peristaltic movement. On the basis of the orientation of the major axis of the ellipse, the massage device can be inserted directly correctly into the body.Embodiment 7See Figure 18.A massage device is provided that includes the driving mechanism described in the above embodiments, and further includes a housing and a silicone outer layer 7. The drive motor 1 and the limiting holder 3 are fixedly connected to the housing. The pushing portion 41 of the movable pushing block 4 abuts on the inner wall surface of the silicone outer layer 7.A plurality of pushing portions 41 are continuously slid in fixed order (corresponding to the arrangement of the eccentric portions 21) to press the silicone outer layer 7 of the massager. The silicone outer layer 7 is in direct contact with the human body so as to achieve the massage effect.

Claims

A drive mechanism for a massage device, comprising a drive motor, a transmission unit, a restriction bracket, and a plurality of movable thrust blocks; wherein each movable thrust block comprises a moving slot and a thrust portion; wherein the transmission unit comprises a plurality of eccentric joints, each eccentric joint comprises a connecting portion and an eccentric portion, wherein the connecting portion is configured to connect adjacent eccentric joints to each other, and the eccentric portion abuts against the moving slot; wherein a rotation shaft of the drive motor is defined as a first rotation axis; wherein a point of the eccentric portion farthest from the first rotation axis is defined as a farthest eccentric end, and a connecting line between adjacent farthest eccentric ends forms a non-zero first inclusion angle with the first rotation axis; wherein the restriction bracket is slidably connected to the movable push blocks, and the sliding movement direction of the movable push blocks is parallel to the width direction of the moving slot.The drive mechanism for a massager according to claim 1, wherein a length of the moving slot is defined as L1, a width of the moving slot is defined as L2, and a distance between the farthest eccentric end and an axis of the drive motor is defined as L3, where 0.5 × L1 ≥ L3 > L2.The drive mechanism for a massager according to claim 1, wherein the restriction bracket comprises a first guide slide groove, a depth direction of the first guide slide groove is parallel to the width direction of the moving slot; an end of the pushing portion in the depth direction of the first guide slide groove protrudes from a circumferential profile of the restriction bracket and moves along the depth direction of the first guide slide groove.The drive mechanism for a massager according to claim 3, wherein the push portion penetrates a peripheral wall surface of the restriction bracket; each movable push block includes two push portions, and the two push portions project in the width direction of the moving slot.The drive mechanism for a massage device according to claim 4, wherein two ends of the limiting bracket in the longitudinal direction are respectively defined as a first link and a second link, the first link and the second link are connected by a plurality of link arms arranged circumferentially around a main axis of the drive motor; a clearance between adjacent link arms forms the first guide slide groove; a longitudinal direction of the first guide slide groove is parallel to the longitudinal direction of the limiting bracket, and a width of the clearance defines a width direction of the first guide slide groove.The driving mechanism for a massager according to claim 5, wherein the link arms form four first guide slide grooves; two non-adjacent first guide slide grooves form a common group of first guide slide grooves, the depth directions of the first guide slide grooves within the same group are parallel to each other, and the depth directions of the first guide slide grooves of different groups are perpendicular to each other; the longitudinal directions of the moving slots of adjacent movable push blocks are perpendicular to each other, and the push portions of adjacent movable push blocks are respectively disposed in the first guide slide grooves of different groups.The drive mechanism for a massager according to claim 1, wherein a distance between an axis of each engaging portion and the axis of the drive motor is equal, and an angle included by the axes of adjacent engaging portions is equal to the axis of the drive motor.The drive mechanism for a massager according to claim 1, wherein the connecting portion is a cylindrical structure, and the eccentric portion is fixedly disposed along the axial direction of the connecting portion.The drive mechanism for a massager according to claim 1, wherein the eccentric portion is a cylindrical structure; wherein the connecting portion includes two connecting holes that respectively connect adjacent eccentric portions to each other; wherein each connecting hole is a non-rotating structure, and an end of the eccentric portion is inserted into and coupled to the connecting hole.A massage device comprising the drive mechanism for a massage device according to claim 1, further comprising a housing and a silicone outer layer, wherein the drive motor and the restriction bracket are fixedly connected to the housing, and a pushing portion of the movable pushing block abuts an inner wall surface of the silicone outer layer.

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