WO2021000164A1 - 振动电机 - Google Patents

振动电机 Download PDF

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Publication number
WO2021000164A1
WO2021000164A1 PCT/CN2019/094064 CN2019094064W WO2021000164A1 WO 2021000164 A1 WO2021000164 A1 WO 2021000164A1 CN 2019094064 W CN2019094064 W CN 2019094064W WO 2021000164 A1 WO2021000164 A1 WO 2021000164A1
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WO
WIPO (PCT)
Prior art keywords
vibration motor
iron core
guide rail
vibrator
mass
Prior art date
Application number
PCT/CN2019/094064
Other languages
English (en)
French (fr)
Inventor
马杰
Original Assignee
瑞声声学科技(深圳)有限公司
瑞声科技(新加坡)有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 瑞声声学科技(深圳)有限公司, 瑞声科技(新加坡)有限公司 filed Critical 瑞声声学科技(深圳)有限公司
Priority to PCT/CN2019/094064 priority Critical patent/WO2021000164A1/zh
Priority to CN201921031338.8U priority patent/CN210350989U/zh
Priority to US16/994,687 priority patent/US11569723B2/en
Publication of WO2021000164A1 publication Critical patent/WO2021000164A1/zh

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/18—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with coil systems moving upon intermittent or reversed energisation thereof by interaction with a fixed field system, e.g. permanent magnets
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B6/00—Tactile signalling systems, e.g. personal calling systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/16—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with polarised armatures moving in alternate directions by reversal or energisation of a single coil system

Definitions

  • This application relates to the field of vibration motors, and in particular to a vibration motor with low friction coefficient and low noise.
  • a vibration motor is a component that uses the principle of electromagnetic force to convert electrical energy into mechanical energy.
  • the vibration motor is usually installed in a portable mobile device to generate vibration feedback, such as the vibration of a mobile phone or a game console.
  • the vibration motor includes a housing having a housing space, a vibrator accommodated in the housing space, and a coil that drives the vibrator to reciprocate.
  • the vibrator of the vibrating motor in the related art is in sliding contact with other parts of the vibrating motor during the vibration process, resulting in high friction between the vibrator and other parts.
  • the friction noise will be generated during the friction process, and the friction noise will greatly reduce the user experience of the portable mobile device.
  • the vibration motor in the related art, because the vibrator is in sliding contact with other components during the vibration process, the friction force is large, and the friction noise may reduce the user experience.
  • the application provides a vibration motor with low friction coefficient and low noise.
  • a vibration motor includes a housing with a containing space, a vibrator contained in the containing space, and a coil that drives the vibrator to reciprocate.
  • the vibrating motor also includes a housing that is contained in the containing space and is fixed to the The guide rail of the housing, the vibrator includes a rolling friction part corresponding to the guide rail, the rolling friction part includes a mass block arranged at a distance from the guide rail and a number of slidingly connected between the mass block and the guide rail Rolling pieces.
  • the housing includes a cylindrical main body and two oppositely spaced end caps, and the two end caps are respectively covered on the openings at both ends of the main body to jointly enclose the receiving space.
  • the guide rail is of a hollow structure and the guide rail is enclosed in a sliding space, the cross-sectional shape of the guide rail in the vertical vibration direction is the same as the cross-sectional shape of the main body in the vertical vibration direction, and the mass is located in the sliding space.
  • the mass block includes a sliding surface arranged opposite to the guide rail, a recessed portion is recessed from the sliding surface in a direction away from the guide rail, and the rolling element is at least partially accommodated in the recessed portion.
  • the rolling element is a ball, and the concave portion is arranged parallel to the vibration direction.
  • the mass block further includes a side surface connected to the sliding surface and perpendicular to the vibration direction, the side surface is arranged opposite to the end cover, the recess extends to the side surface, and the vibration motor It also includes a baffle plate attached and fixed to the side surface, and the projection of the recessed portion in the vertical vibration direction at least partially overlaps the baffle plate.
  • the projection of the mass along the vertical vibration direction is rectangular
  • the sliding surface includes a first surface arranged relatively parallel and spaced apart, and a second surface connected to the first surface and arranged relatively parallel and spaced apart, the recessed portion Recessed from the first surface and/or recessed from the second surface.
  • the vibration motor further includes a stopper fixed on the end cover, and the stopper includes a first magnet fixed to the end cover and a first magnet fixed to the first magnet close to the mass. Permeable sheet on the surface of the block.
  • the vibrator further includes an iron core at an intermediate position and a second magnetic steel fixed at both ends of the iron core, the iron core is located in the space enclosed by the coil and is arranged opposite to the coil, The second magnetic steel is sandwiched between the rolling friction part and the iron core.
  • the second magnetic steel has a hollow structure
  • the second magnetic steel includes a magnetic steel body part and an accommodation space enclosed by the magnetic steel body part
  • the iron core includes an iron core body part and a self-supporting
  • the iron core body part is formed by an iron core extension part extending in the direction of the rolling friction part, and the iron core extension part is accommodated in the accommodating space.
  • the rolling friction portion further includes a mass extension formed from the mass toward a direction close to the iron core, and the mass extension is accommodated in the accommodating space.
  • the polarities of the second magnets at both ends of the iron core are opposite.
  • the second magnetic steel is arranged opposite to the adjacent first magnetic steel in the same pole.
  • the winding direction of the coil is parallel to the vibration direction.
  • the vibration motor provided by the present application is provided with a rolling friction part and a guide rail.
  • the rolling friction part includes a mass block arranged opposite to the guide rail and slidingly connected between the mass block and the guide rail. Through the rolling elements, the rolling friction between the vibrator and the guide rail is realized. The friction force between the vibrator and the guide rail is small and the noise is low, which effectively improves the performance of the vibration motor.
  • FIG. 1 is a schematic diagram of the three-dimensional structure of the vibration motor provided by this application.
  • Fig. 2 is a schematic diagram of an exploded structure of the vibration motor shown in Fig. 1;
  • Figure 3 is a sectional view taken along III-III shown in Figure 1;
  • FIG. 4 is a schematic diagram of the magnetic pole polarity distribution of the structure shown in FIG. 3.
  • the present application provides a vibration motor 100, which includes a housing 10 having a receiving space, a guide rail 20 and a stopper 30 received in the receiving space and fixed to the housing 10, and The vibrator 40, a coil 50 that drives the vibrator 40 to reciprocate, and a baffle 60 fixed on the vibrator 40.
  • the housing 10 includes a cylindrical main body 11 and two oppositely spaced end caps 13, respectively covering the two end openings of the main body 11 to jointly enclose the receiving space .
  • the vibrator 40 is arranged along the extension direction of the main body 11 (from one end cover 111 to the other end cover 111), and the vibrator 50 can move along the extension direction of the main body 11 vibration.
  • the guide rail 20 has a hollow structure and the guide rail 20 encloses a sliding space 21.
  • the cross-sectional shape of the guide rail 20 along the vertical vibration direction is the same as the cross-sectional shape of the main body 11 along the vertical vibration direction.
  • the stopper 30 is arranged directly opposite to the vibrator 40.
  • the stopper 30 includes a first magnet 31 fixed to the end cover 13 and a first magnet 31 fixed to the first magnet 31 close to the vibrator 40.
  • the stopper 30 is used to provide a repulsive force to the vibrator 40 to prevent the vibrator 40 from hitting the end cover 13.
  • two stoppers 30 are provided, and the two stoppers 30 are respectively provided on the two end covers 13 respectively, and the stoppers 30 are provided on the two end covers 13 respectively.
  • the repulsive force to the vibrator 40 can be increased, thereby improving the vibration effect of the vibration motor 100.
  • the vibrator 40 includes an iron core 41 located at an intermediate position, a rolling friction portion 43 arranged opposite to the iron core 41, and a second magnetic steel sandwiched between the iron core 41 and the rolling friction portion 43 45.
  • the iron core 41 includes an iron core body portion 411 and an iron core extension portion 413 extending from the iron core body portion 411 toward the rolling friction portion 43.
  • the iron core extension portion 413 is provided with two, two
  • the core extension portion 413 is formed to extend from the core body portion 411 toward the two rolling friction portions 43 respectively.
  • the second magnet 45 has a hollow structure, and the second magnet 45 includes a magnet body 451 and a receiving space 453 surrounded by the magnet body 451.
  • the two iron core extension portions 413 are respectively accommodated in the accommodating spaces 453 of the two second magnets 45, which improves the connection and fixing effect between the iron core 41 and the second magnet 45.
  • the two rolling friction parts 43 are respectively arranged corresponding to the two guide rails 20, and the rolling friction part 43 includes a mass block 431 arranged at a distance from the guide rail 20, and is slidably connected to the mass block 431 and the guide rail 20.
  • the mass extension 435 and the mass 431 are an integral structure.
  • the mass block 431 is located in the sliding space 21, and the mass block 431 includes a sliding surface 4311 arranged opposite to the guide rail 20 and a recessed portion 4312 formed from the sliding surface 4311 in a direction away from the guide rail. And a side surface 4313 connected to the sliding surface 4311 and perpendicular to the vibration direction, the side surface 4313 is disposed opposite to the end cover 13, and the recess 4312 extends to the side surface 4313.
  • the rolling element 433 is at least partially contained in the recessed portion 4312, the blocking piece 60 is attached and fixed to the side surface 4313, and the projection of the recessed portion 4312 along the vertical vibration direction is at least partially overlapping.
  • the baffle 60 By arranging the baffle 60 to be pasted and fixed on the side surface 4313, the position of the rolling element 433 can be well restricted, and the rolling element 433 is prevented from falling, thereby improving the vibration motor 100 stability.
  • the projection of the mass 431 along the vertical vibration direction is rectangular, the sliding surface 4311 includes two relatively parallel and spaced apart first surfaces 4314 and a second surface 4315 connected to the first surface 4314 and relatively parallel and spaced apart.
  • the recessed portion 4312 is formed recessed from the first surface 4314 and/or from the second surface 4315.
  • each of the first surface 4314 and the second surface 4315 is recessed to form a recess 4312, that is, in this embodiment, each mass 431 is provided with four One of the recesses 4312.
  • the guide rail 20 has a hollow rectangular structure
  • the four recesses 4312 are respectively provided corresponding to the four walls of the guide rail 20
  • the four rolling elements 433 correspond to the four guide rails 20 respectively.
  • the four walls are arranged so that the mass 431 and the guide rail 20 are completely spaced apart, and the friction force can be effectively reduced by the rolling element 433.
  • the guide rail 20 can have any other shape, and the number of the rolling elements 433 can also be any required number, that is, it only needs to be between the guide rail 20 and the mass block 431.
  • the rolling element 433 is arranged between to reduce the friction, and the mass block 431 is separated from the guide rail 20.
  • the rolling element 433 is a spherical ball, and the recess 4312 is arranged parallel to the vibration direction.
  • the recessed portion 4312 may be arranged along the vertical vibration direction, and the rolling element 433 may be a cylindrical rolling element, and the cylindrical rolling element includes two oppositely spaced top surfaces and two connecting pieces. The side surfaces of the top surface respectively abut the mass 431 and the guide rail 20 through the pair of side surfaces to achieve rolling friction.
  • the mass extension 435 is contained in the accommodating space 453, thereby improving the connection and fixing effect between the mass 431 and the second magnet 45.
  • the coil 50 has a hollow structure and is fixed in the main body 11, the guide rail 20 and the coil 50 are arranged in sequence along the extension direction of the main body 11, and the coil 50 is located in the middle of the main body 11
  • the two guide rails 20 are respectively located at two ends of the main body 11, and the two guide rails 20 are arranged symmetrically with respect to the coil 50. Specifically, the winding direction of the coil 50 is parallel to the vibration direction.
  • the magnetic poles of the second magnetic steel 45 at both ends of the iron core 41 are opposite, and the second magnetic steel 45 and the first magnetic steel 31 are arranged at the same pole.
  • the magnetic pole polarity of the first magnet 31 close to the second magnet 45 is S
  • the second magnet 45 close to the first magnet 31 The magnetic pole polarity of the second magnet 45 is S
  • the magnetic pole polarity of the second magnet 45 away from the first magnet 31 is N.
  • the magnetic lines of induction of the two second magnets 45 are emitted outward through the iron core 41, and act with the coil 50 after being energized to form a driving force to drive the vibrator 40 along the extension direction of the main body 11 Reciprocating motion.
  • the magnetic poles of the first magnetic steel 31 and the second magnetic steel 45 are opposite to each other to form a repulsive force, thereby providing the required supporting rigidity of the vibrator 40 in the extending direction of the main body portion 11. Since the first magnetic steel 31 cannot provide the vibrator 40 with supporting rigidity in other directions, the vibrator 40 and the guide rail 20 will be in contact with each other.
  • the vibrator 40 Rolling friction is achieved with the guide rail 20, which effectively reduces the frictional force and has low noise, which improves the performance of the vibration motor 100.
  • the vibration motor 100 provided in the present application makes full use of the space of the vibrator 40 and avoids the installation of a bearing occupying a lot of space. Moreover, the mass of the vibrator 40 is large, which also improves performance.
  • the structure of the rolling friction portion 43 is simple, avoiding a complicated bearing structure.
  • the vibration motor provided by the present application is provided with a rolling friction part and a guide rail.
  • the rolling friction part includes a mass block arranged opposite to the guide rail and slidingly connected between the mass block and the guide rail.
  • the several rolling elements realize rolling friction between the vibrator and the housing through the rolling elements, and the friction between the vibrator and the guide rail is small, and the noise is low, which effectively improves the performance of the vibration motor.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

一种振动电机（100），其包括具有收容空间的外壳（10）、收容于所述收容空间内的振子（40）以及驱动所述振子（40）往复运动的线圈（50），所述振动电机（100）还包括收容于所述收容空间内并固定于所述外壳（10）的导轨（20），所述振子（40）包括对应所述导轨（20）设置的滚动摩擦部（43），所述滚动摩擦部（43）包括与所述导轨（20）相对间隔设置的质量块（431）及滑动连接于所述质量块（431）与所述导轨（20）之间的若干滚动件（433）。该振动电机（100）可以有效降低摩擦力，提升性能。

Description

振动电机 技术领域
本申请涉及振动电机领域，尤其涉及一种摩擦系数低、噪音小的振动电机。
 背景技术
振动电机是一种利用电磁力的产生原理将电能转换为机械能的部件，振动电机通常安装在便携式移动设备内，以产生振动反馈，如手机的振动或者游戏机的振动反馈等。
相关技术中，振动电机包括具有收容空间的壳体、收容于所述收容空间内的振子以及驱动所述振子往复运动的线圈。
然而，相关技术中的振动电机的振子在振动过程中与振动电机的其他部件之间为滑动接触，导致振子和其他部件之间摩擦力大。并且摩擦的过程中会产生“嚓嚓”的摩擦噪声，摩擦噪声也会大大降低了用户使用便携式移动设备的用户体验。
因此，有必要提供一种改进的振动电机来解决上述问题。
 技术问题
针对相关技术中的振动电机由于振子在振动过程中与其他部件为滑动接触，导致摩擦力大，并且会带来摩擦噪声降低用户体验的技术问题。本申请提供了一种摩擦系数低、噪音小的振动电机。
 技术解决方案
一种振动电机，其包括具有收容空间的外壳、收容于所述收容空间内的振子以及驱动所述振子往复运动的线圈，所述振动电机还包括收容于所述收容空间内并固定于所述外壳的导轨，所述振子包括对应所述导轨设置的滚动摩擦部，所述滚动摩擦部包括与所述导轨相对间隔设置的质量块及滑动连接于所述质量块与所述导轨之间的若干滚动件。
优选的，所述外壳包括呈筒状的主体部以及两相对间隔设置的端盖，两所述端盖分别盖设于所述主体部的两端开口部以共同围成所述收容空间，所述导轨呈中空结构且所述导轨围设成滑动空间，所述导轨沿垂直振动方向的截面形状与所述主体部沿垂直振动方向的截面形状相同，所述质量块位于所述滑动空间内。
优选的，所述质量块包括与所述导轨相对间隔设置的滑动面，自所述滑动面向远离所述导轨方向凹陷形成凹陷部，所述滚动件至少部分收容于所述凹陷部。
优选的，所述滚动件为滚珠，所述凹陷部平行于所述振动方向设置。
优选的，所述质量块还包括连接所述滑动面且垂直于振动方向的侧表面，所述侧表面与所述端盖相对设置，所述凹陷部延伸至所述侧表面，所述振动电机还包括贴设固定于所述侧表面的挡片，所述凹陷部沿垂直振动方向的投影与所述挡片至少部分重叠。
优选的，所述质量块沿垂直振动方向的投影呈矩形，所述滑动面包括相对平行间隔设置的第一表面以及连接所述第一表面且相对平行间隔设置的第二表面，所述凹陷部自所述第一表面凹陷和/或自所述第二表面凹陷。
优选的，所述振动电机还包括固定于所述端盖上的止动件，所述止动件包括固定于所述端盖第一磁钢以及固定于所述第一磁钢靠近所述质量块的表面上的导磁片。
优选的，所述振子还包括位于中间位置的铁芯及固定于所述铁芯两端的第二磁钢，所述铁芯位于所述线圈围成的空间内并与所述线圈相对间隔设置，所述第二磁钢夹设于所述滚动摩擦部与所述铁芯之间。
优选的，所述第二磁钢呈中空结构，所述第二磁钢包括磁钢本体部及由所述磁钢本体部围成的容纳空间，所述铁芯包括铁芯本体部及自所述铁芯本体部向所述滚动摩擦部方向延伸形成的铁芯延伸部，所述铁芯延伸部收容于所述容纳空间内。
优选的，所述滚动摩擦部还包括自所述质量块向靠近所述铁芯方向延伸形成的质量块延伸部，所述质量块延伸部收容于所述容纳空间内。
优选的，所述铁芯两端的所述第二磁钢极性相反。
优选的，所述第二磁钢与相邻的所述第一磁钢同极相对设置。
优选的，所述线圈的绕线方向平行于振动方向。
 有益效果
与相关技术相比，本申请提供的振动电机通过设置滚动摩擦部与导轨，所述滚动摩擦部包括与所述导轨相对间隔设置的质量块及滑动连接于所述质量块与所述导轨之间的若干滚动件，通过所述滚动件实现振子与所述导轨之间的滚动摩擦，所述振子与所述导轨之间摩擦力小、噪音小，有效地提升了所述振动电机的性能。
 附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图，其中：
图1为本申请提供的振动电机的立体结构示意图；
图2为图1所示振动电机的分解结构示意图；
图3为沿图1所示III-III的剖视图；
图4为图3所示结构的磁极极性分布示意图。
 本发明的最佳实施方式
下面将对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本申请的一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本申请保护的范围。
请结合参阅图1至图3。本申请提供了一种振动电机100，其包括具有收容空间的外壳10、收容于所述收容空间内并固定于所述外壳10的导轨20和止动件30、收容于所述收容空间内的振子40、驱动所述振子40往复运动的线圈50及固定于所述振子40上的挡片60。
所述外壳10包括呈筒状的主体部11以及两相对间隔设置的端盖13，两所述端盖13分别盖设于所述主体部11的两端开口部以共同围成所述收容空间。所述振子40沿所述主体部11的延伸方向（自一个所述端盖111往另一个所述端盖111方向的）设置，且所述振子50能沿所述主体部11的延伸方向进行振动。
所述导轨20呈中空结构且所述导轨20围成滑动空间21，所述导轨20沿垂直振动方向的截面形状与所述主体部11沿垂直振动方向的截面形状相同。具体的，在本实施例中，所述导轨20设有两个，两所述导轨20分别对应位于所述主体部11的两端。
所述止动件30正对所述振子40设置，所述止动件30包括固定于所述端盖13的第一磁钢31及固定于所述第一磁钢31靠近所述振子40的表面的导磁片33。所述止动件30用于对所述振子40提供排斥力，避免所述振子40撞击到所述端盖13。具体的，所述止动件30设有两个，两所述止动件30分别对应设于两所述端盖13上，通过在两所述端盖13上分别设置所述止动件30可以增加对所述振子40的排斥力，从而提升了所述振动电机100的振动效果。
所述振子40包括位于中间位置的铁芯41、与所述铁芯41相对间隔设置的滚动摩擦部43及夹设于所述铁芯41与所述滚动摩擦部43之间的第二磁钢45。所述滚动摩擦部43与所述第二磁钢45分别设有两个，两所述滚动摩擦部43关于所述铁芯41间隔对称设置，两所述滚动摩擦部43分别对应位于靠近两所述端盖13的一侧，两所述第二磁钢45分别固定于所述铁芯41的两端。
所述铁芯41包括铁芯本体部411及自所述铁芯本体部411向所述滚动摩擦部43方向延伸形成的铁芯延伸部413，所述铁芯延伸部413设有两个，两所述铁芯延伸部413自所述铁芯本体部411分别向两所述滚动摩擦部43方向延伸形成。
所述第二磁钢45呈中空结构，所述第二磁钢45包括磁钢本体部451及由所述磁钢本体部451围成的容纳空间453。两所述铁芯延伸部413分别对应收容于两所述第二磁钢45的所述容纳空间453内，提升了所述铁芯41与所述第二磁钢45之间的连接固定效果。
两所述滚动摩擦部43分别对应两所述导轨20设置，所述滚动摩擦部43包括与所述导轨20相对间隔设置的质量块431、滑动连接于所述质量块431与所述导轨20之间的若干滚动件433及自所述质量块431向靠近所述铁芯41方向延伸形成的质量块延伸部435，所述质量块延伸部435与所述质量块431为一体结构。通过设置所述滚动件433夹设于所述质量块431与所述导轨20之间，实现所述振子40与所述导轨20之间滚动摩擦，让所述振子40在振动时与所述导轨20之间的摩擦力小、噪音小，有效的提升了所述振动电机100的性能。同时，通过设置所述质量块431也增加了所述振子40的质量，从而也可有效的提升了所述振动电机100的性能。
所述质量块431位于所述滑动空间21内，所述质量块431包括与所述导轨20相对间隔设置的滑动面4311、自所述滑动面4311向远离所述导轨方向凹陷形成的凹陷部4312及连接所述滑动面4311且垂直于振动方向的侧表面4313，所述侧表面4313与所述端盖13相对设置，所述凹陷部4312延伸至所述侧表面4313。
所述滚动件433至少部分收容于所述凹陷部4312内，所述挡片60贴设固定于所述侧表面4313，所述凹陷部4312沿垂直振动方向的投影与所述挡片60至少部分重叠。通过设置所述挡片60贴设固定于所述侧表面4313，可以对所述滚动件433的位置进行良好的限制，避免了所述滚动件433掉落，从而提升了所述振动电机100的稳定性。
所述质量块431沿垂直振动方向的投影呈矩形，所述滑动面4311包括两相对平行间隔设置的第一表面4314以及连接所述第一表面4314且相对平行间隔设置的第二表面4315，所述凹陷部4312自所述第一表面4314和/或自所述第二表面4315凹陷形成。具体的，在本实施例中，每个所述第一表面4314及所述第二表面4315均凹陷形成有一个所述凹陷部4312，即本实施例中每个所述质量块431设有四个所述凹陷部4312。相对应的，每个所述滚动摩擦部43的所述滚动件433设有四个，四个所述滚动件433分别对应收容于四个所述凹陷部4312内。
在本实施例中，所述导轨20呈中空的矩形结构，四个所述凹陷部4312分别对应所述导轨20的四个壁设置，四个所述滚动件433分别对应四个所述导轨20的四个壁设置，从而使得所述质量块431与所述导轨20之间完全间隔，可以通过所述滚动件433有效降低摩擦力。当然，在其他实施例中，所述导轨20可呈其他任意形状，同时所述滚动件433设置的数量也可为任意所需数量，即只需在所述导轨20与所述质量块431之间设置所述滚动件433来降低摩擦力，让所述质量块431与所述导轨20间隔即可。
在本实施例中，所述滚动件433为球状的滚珠，所述凹陷部4312平行于振动方向设置。当然，在其他实施例中，所述凹陷部4312可沿垂直振动方向设置，且所述滚动件433可为圆柱状滚动件，所述圆柱状滚动件包括两相对间隔设置的顶面及连接两所述顶面的侧面，通过所述侧面对分别与所述质量块431与所述导轨20抵接，实现滚动摩擦。
所述质量块延伸部435收容于所述容纳空间453内，从而提升了质量块431与所述第二磁钢45之间的连接固定效果。
所述线圈50呈中空结构且固定于所述主体部11内，所述导轨20与所述线圈50沿所述主体部11的延伸方向依次设置，所述线圈50位于所述主体部11的中部，两所述导轨20分别位于所述主体部11的两端，且两所述导轨20关于所述线圈50间隔对称设置。具体的，所述线圈50的绕线方向平行于振动方向。
所述挡片60设有两个，两所述挡片60对应两所述质量块431设置。
请结合参阅图4。所述铁芯41两端的所述第二磁钢45的磁极极性相反，所述第二磁钢45与所述第一磁钢31同极设置。具体的，在本实施例中，所述第一磁钢31靠近所述第二磁钢45一侧的磁极极性为S，所述第二磁钢45靠近所述第一磁钢31一侧的磁极极性为S，所述第二磁钢45远离所述第一磁钢31一侧的磁极极性为N。
两所述第二磁钢45的磁感线通过所述铁芯41向外发射，并与通电后的所述线圈50作用形成驱动力，驱动所述振子40沿所述主体部11的延伸方向往复运动。所述第一磁钢31与所述第二磁钢45的磁极极性相对，形成排斥力，从而提供了所述振子40在所述主体部11的延伸方向所需的支承刚度。由于所述第一磁钢31不能对所述振子40提供其他方向的支承刚度，会使所述振子40与所述导轨20之间接触，而通过设置所述滚动件433可以使得所述振子40与所述导轨20之间实现滚动摩擦，有效的降低了摩擦力，并且噪音小，提升了所述振动电机100的性能。本申请提供的所述振动电机100充分利用了所述振子40的空间，避免了安装轴承占用大量的空间。并且，所述振子40的质量大，对性能也有所提升。同时，所述滚动摩擦部43的结构简单，避免了复杂的轴承结构。
与相关技术相比，本申请提供的振动电机通过设置滚动摩擦部与导轨，所述滚动摩擦部包括与所述导轨相对间隔设置的质量块及滑动连接于所述质量块与所述导轨之间的若干滚动件，通过所述滚动件实现振子与壳体之间的滚动摩擦，所述振子与所述导轨之间摩擦力小、噪音小，有效地提升了所述振动电机的性能。
以上所述的仅是本申请的实施方式，在此应当指出，对于本领域的普通技术人员来说，在不脱离本申请创造构思的前提下，还可以做出改进，但这些均属于本申请的保护范围。
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Claims (10)

  1. 一种振动电机，包括具有收容空间的外壳、收容于所述收容空间内的振子以及驱动所述振子往复运动的线圈，其特征在于，所述振动电机还包括收容于所述收容空间内并固定于所述外壳的导轨，所述振子包括对应所述导轨设置的滚动摩擦部，所述滚动摩擦部包括与所述导轨相对间隔设置的质量块及滑动连接于所述质量块与所述导轨之间的若干滚动件。
  2. 根据权利要求1所述的振动电机，其特征在于，所述外壳包括呈筒状的主体部以及两相对间隔设置的端盖，两所述端盖分别盖设于所述主体部的两端开口部以共同围成所述收容空间，所述导轨呈中空结构且所述导轨围设成滑动空间，所述导轨沿垂直振动方向的截面形状与所述主体部沿垂直振动方向的截面形状相同，所述质量块位于所述滑动空间内。
  3. 根据权利要求2所述的振动电机，其特征在于，所述质量块包括与所述导轨相对间隔设置的滑动面及自所述滑动面向远离所述导轨方向凹陷形成凹陷部，所述滚动件至少部分收容于所述凹陷部。
  4. 根据权利要求3所述的振动电机，其特征在于，所述滚动件为滚珠，所述凹陷部平行于所述振动方向设置。
  5. 根据权利要求4所述的振动电机，其特征在于，所述质量块还包括连接所述滑动面且垂直于振动方向的侧表面，所述侧表面与所述端盖相对设置，所述凹陷部延伸至所述侧表面，所述振动电机还包括贴设固定于所述侧表面的挡片，所述凹陷部沿垂直振动方向的投影与所述挡片至少部分重叠。
  6. 根据权利要求3所述的振动电机，其特征在于，所述质量块沿垂直振动方向的投影呈矩形，所述滑动面包括相对平行间隔设置的第一表面以及连接所述第一表面且相对平行间隔设置的第二表面，所述凹陷部自所述第一表面凹陷和/或自所述第二表面凹陷。
  7. 根据权利要求2所述的振动电机，其特征在于，所述振动电机还包括固定于所述端盖上的止动件，所述止动件包括固定于所述端盖第一磁钢以及固定于所述第一磁钢靠近所述质量块的表面上的导磁片。
  8. 根据权利要求7所述的振动电机，其特征在于，所述振子还包括位于中间位置的铁芯及固定于所述铁芯两端的第二磁钢，所述铁芯位于所述线圈围成的空间内并与所述线圈相对间隔设置，所述第二磁钢夹设于所述滚动摩擦部与所述铁芯之间。
  9. 根据权利要求8所述的振动电机，其特征在于，所述第二磁钢呈中空结构，所述第二磁钢包括磁钢本体部及由所述磁钢本体部围成的容纳空间，所述铁芯包括铁芯本体部及自所述铁芯本体部向所述滚动摩擦部方向延伸形成的铁芯延伸部，所述铁芯延伸部收容于所述容纳空间内。
  10. 根据权利要求8所述的振动电机，其特征在于，所述滚动摩擦部还包括自所述质量块向靠近所述铁芯方向延伸形成的质量块延伸部，所述质量块延伸部收容于所述容纳空间内。
    [权利要求 11]  根据权利要求8所述的振动电机，其特征在于，所述铁芯两端的所述第二磁钢极性相反。
    [权利要求 12]  根据权利要求8所述的振动电机，其特征在于，所述第二磁钢与相邻的所述第一磁钢同极相对设置。
    [权利要求 13] 根据权利要求1所述的振动电机，其特征在于，所述线圈的绕线方向平行于振动方向。
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CN206341112U (zh) * 2016-10-25 2017-07-18 瑞声科技(新加坡)有限公司 振动电机

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