CN109353438B - A kind of shock-absorbing balance car - Google Patents
A kind of shock-absorbing balance car Download PDFInfo
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- CN109353438B CN109353438B CN201811181232.6A CN201811181232A CN109353438B CN 109353438 B CN109353438 B CN 109353438B CN 201811181232 A CN201811181232 A CN 201811181232A CN 109353438 B CN109353438 B CN 109353438B
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- 230000007246 mechanism Effects 0.000 claims abstract description 59
- 230000035939 shock Effects 0.000 claims description 84
- 239000006096 absorbing agent Substances 0.000 claims description 36
- 239000002184 metal Substances 0.000 claims description 31
- 238000010521 absorption reaction Methods 0.000 claims description 13
- 238000013016 damping Methods 0.000 abstract description 23
- 230000000694 effects Effects 0.000 abstract description 11
- 239000000725 suspension Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
- B62K11/00—Motorcycles, engine-assisted cycles or motor scooters with one or two wheels
- B62K11/007—Automatic balancing machines with single main ground engaging wheel or coaxial wheels supporting a rider
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
- B62K25/00—Axle suspensions
- B62K25/04—Axle suspensions for mounting axles resiliently on cycle frame or fork
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vibration Prevention Devices (AREA)
- Vibration Dampers (AREA)
Abstract
Description
技术领域Technical field
本发明涉及平衡车领域，尤其涉及一种减震平衡车。The present invention relates to the field of balancing vehicles, and in particular to a shock-absorbing balancing vehicle.
背景技术Background technique
平衡车的体积很小，方便携带，其结构非常紧凑，两个车轮分别安装在两个轮轴上，两个轮轴分别通过两个驱动机构驱动，驱动机构一般是电机，由此，可以减薄平衡车中部的厚度，降低其重心，避免侧翻。汽车一般通过悬架系统中的减震原件减震，悬架系统还包括导向机构，而平衡车受空间限制，两侧一般只设置导向机构，不设置减震器。The balance car is small in size and easy to carry. Its structure is very compact. The two wheels are installed on two axles respectively. The two axles are driven by two driving mechanisms. The driving mechanism is usually a motor. Therefore, the balance car can be thinned. The thickness of the middle part of the car lowers its center of gravity and avoids rollover. Cars generally absorb shock through shock-absorbing components in the suspension system. The suspension system also includes a guide mechanism. However, due to space limitations, a balancing car generally only has guide mechanisms on both sides and no shock absorbers.
CN207328701U-一种多维减震平衡车，公开了经弹簧来减震的结构，从其附图中看，一个驱动机构上设有两个弹簧，该专利另外还在轮轴与安装孔的内壁之间设置了减震软体减少震动，但减震软体的减震能力较弱，减震软体主要是起到减少各个维度的震动的作用，竖直方向的减震作用主要还是靠弹簧。中国专利CN201320665114.9公开了一种两轮自平衡车，该平衡车上设置了与座体连接的悬架系统，每个悬架系统包括两个避震器。从现有技术可以看出，由于平衡车的驱动机构与车体外壳在竖直方向上的间距很小，所以通常需要在驱动机构前后两侧均设置减震器来减震，以在较短的弹性形变距离内起到减震效果。现有技术存在的问题是：将减震器限制在车身左右两侧，该处空间狭小，减震部件的形变距离短，尽管在一侧的驱动装置上设置两个阻尼器，减震作用依然不理想。CN207328701U - a multi-dimensional shock-absorbing balance car, which discloses a structure for absorbing shock through springs. From the drawings, one driving mechanism is provided with two springs. The patent also has a space between the wheel axle and the inner wall of the mounting hole. Shock-absorbing software is installed to reduce vibration, but the shock-absorbing ability of the shock-absorbing software is weak. The shock-absorbing software mainly plays the role of reducing vibrations in various dimensions. The vertical shock-absorbing effect mainly relies on springs. Chinese patent CN201320665114.9 discloses a two-wheeled self-balancing vehicle. The balancing vehicle is provided with a suspension system connected to a base, and each suspension system includes two shock absorbers. It can be seen from the existing technology that since the vertical distance between the driving mechanism of the balancing car and the body shell is very small, it is usually necessary to install shock absorbers on both the front and rear sides of the driving mechanism to absorb shock in a short period of time. It has a shock-absorbing effect within the elastic deformation distance. The problem with the existing technology is that the shock absorbers are limited to the left and right sides of the vehicle body, where the space is narrow and the deformation distance of the shock absorbing components is short. Even though two dampers are provided on the driving device on one side, the shock absorbing effect is still there. not ideal.
发明内容Contents of the invention
本发明要解决的技术问题是：提供一种减震平衡车，提高减震效果。The technical problem to be solved by the present invention is to provide a shock-absorbing balancing car to improve the shock-absorbing effect.
本发明解决其技术问题的解决方案是：The solution of the present invention to solve its technical problems is:
一种减震平衡车，包括平衡车外壳、左驱动机构、右驱动机构、减震器，所述左驱动机构、右驱动机构分别设于所述平衡车外壳的左部和右部，所述减震器包括左减震部件、右减震部件，所述右减震部件具有与所述左减震部件一致的结构，左减震部件的上下两端分别与平衡车外壳的右上部、左驱动机构铰接，右减震部件的上下两端分别与平衡车外壳的左上部、右驱动机构铰接。A shock-absorbing balancing car includes a balancing car casing, a left driving mechanism, a right driving mechanism, and a shock absorber. The left driving mechanism and the right driving mechanism are respectively located on the left and right parts of the balancing car casing, and the The shock absorber includes a left shock absorber component and a right shock absorber component. The right shock absorber component has the same structure as the left shock absorber component. The upper and lower ends of the left shock absorber component are respectively connected with the upper right part and the left part of the balance car shell. The driving mechanism is hinged, and the upper and lower ends of the right damping component are respectively hinged with the upper left part of the balance vehicle shell and the right driving mechanism.
作为上述技术方案的进一步改进，所述左减震部件包括至少一条弹性金属条，弹性金属条两端均固接有连接头。As a further improvement of the above technical solution, the left shock absorbing component includes at least one elastic metal strip, and connectors are fixedly connected to both ends of the elastic metal strip.
作为上述技术方案的进一步改进，所述左减震部件包括四条弹性金属条，四条弹性金属条间隔设置并且整体呈矩形阵列。As a further improvement of the above technical solution, the left shock absorbing component includes four elastic metal strips, which are spaced apart and formed into a rectangular array as a whole.
作为上述技术方案的进一步改进，所述左减震部件的其中两条弹性金属条设于右减震部件的四条弹性金属条之间，右减震部件的其中两条弹性金属条设于左减震部件的四条弹性金属条之间。As a further improvement of the above technical solution, two of the elastic metal strips of the left damping component are arranged between the four elastic metal bars of the right damping component, and two of the elastic metal bars of the right damping component are arranged between the left damping component and the left damping component. between the four elastic metal strips of the shock component.
作为上述技术方案的进一步改进，所述减震器还包括连接板，所述连接板的左上部和右上部均设有连接部件，所述连接部件与平衡车外壳连接，左减震部件的上端的连接头、右减震部件上端的连接头均与所述连接板铰接。As a further improvement of the above technical solution, the shock absorber also includes a connecting plate, the upper left part and the upper right part of the connecting plate are both provided with connecting parts, the connecting parts are connected to the balance car shell, and the upper end of the left shock absorbing part The connector at the upper end of the right shock-absorbing component is hinged with the connecting plate.
作为上述技术方案的进一步改进，所述连接部件包括关节轴承和连接轴，所述关节轴承固设在所述连接板上，所述连接轴的一端与所述关节轴承连接，所述连接轴的另一端与平衡车外壳固接。As a further improvement of the above technical solution, the connecting component includes a spherical bearing and a connecting shaft, the spherical bearing is fixed on the connecting plate, one end of the connecting shaft is connected to the spherical bearing, and the connecting shaft The other end is fixedly connected with the balance car shell.
作为上述技术方案的进一步改进，所述减震器还包括开口向上的连接槽体，所述连接槽体设于所述连接板下方，且所述连接槽体与所述连接板之间设有间隙，所述连接槽体的左部和右部分别设有左连接孔和右连接孔，所述左连接孔、右连接孔分别与所述左驱动机构、右驱动机构螺栓连接，左减震部件下端的连接头、右减震部件下端的连接头均设于所述连接槽体内并与所述连接槽体铰接。As a further improvement of the above technical solution, the shock absorber further includes a connecting groove body with an upward opening, the connecting groove body is provided below the connecting plate, and there is a connecting groove body between the connecting groove body and the connecting plate. The left and right parts of the connecting tank body are respectively provided with left connecting holes and right connecting holes. The left connecting holes and the right connecting holes are bolted to the left driving mechanism and the right driving mechanism respectively. The left shock absorber The connector at the lower end of the component and the connector at the lower end of the right damping component are both located in the connecting groove body and are hingedly connected with the connecting groove body.
作为上述技术方案的进一步改进，所述减震器还包括连接盖板，所述连接盖板与所述连接板连接，左减震部件的上部、右减震部件的上部均设于所述连接盖板与所述连接板之间。As a further improvement of the above technical solution, the shock absorber further includes a connecting cover plate, which is connected to the connecting plate, and the upper part of the left shock absorbing component and the upper part of the right shock absorbing component are both located on the connecting plate. between the cover plate and the connecting plate.
作为上述技术方案的进一步改进，所述减震器还包括左阻尼器、右阻尼器，所述左阻尼器的上下两端分别与平衡车外壳的左上部、左驱动机构铰接，右阻尼器两端分别与平衡车外壳的右上部、右驱动机构铰接。As a further improvement of the above technical solution, the shock absorber also includes a left damper and a right damper. The upper and lower ends of the left damper are respectively hinged with the upper left part of the balance car shell and the left driving mechanism. The two ends of the right damper are respectively hinged. The ends are respectively hinged with the upper right part of the balance car shell and the right driving mechanism.
作为上述技术方案的进一步改进，所述左驱动机构、右驱动机构的前后两侧均设有减震器。As a further improvement of the above technical solution, shock absorbers are provided on both front and rear sides of the left driving mechanism and the right driving mechanism.
本发明的有益效果是：本发明的左减震部件不设置在左驱动机构的正上方，而左减震部件的上下两端分别与平衡车外壳的右上部、左驱动机构铰接，如此，左减震部件本身的长度可以较长，可以发生的形变较大，因此减震效果好。当右车轮震动时，本发明的工作原理与左车轮震动时一致。The beneficial effects of the present invention are: the left shock absorbing component of the present invention is not arranged directly above the left driving mechanism, but the upper and lower ends of the left shock absorbing component are respectively hinged with the upper right part of the balance vehicle shell and the left driving mechanism. In this way, the left The length of the shock-absorbing component itself can be longer and the deformation that can occur is greater, so the shock-absorbing effect is good. When the right wheel vibrates, the working principle of the present invention is the same as when the left wheel vibrates.
附图说明Description of the drawings
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单说明。显然，所描述的附图只是本发明的一部分实施例，而不是全部实施例，本领域的技术人员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他设计方案和附图。In order to explain the technical solutions in the embodiments of the present invention more clearly, the drawings needed to be used in the description of the embodiments will be briefly described below. Obviously, the described drawings are only some of the embodiments of the present invention, not all embodiments. Those skilled in the art can also obtain other design solutions and drawings based on these drawings without exerting creative efforts.
图1是本发明的示意图；Figure 1 is a schematic diagram of the present invention;
图2是本发明的减震器的示意图；Figure 2 is a schematic diagram of the shock absorber of the present invention;
图3是本发明的减震器的立体图；Figure 3 is a perspective view of the shock absorber of the present invention;
图4是本发明的弹性金属条的立体图。Figure 4 is a perspective view of the elastic metal strip of the present invention.
具体实施方式Detailed ways
以下将结合实施例和附图对本发明的构思、具体结构及产生的技术效果进行清楚、完整地描述，以充分地理解本发明的目的、特征和效果。显然，所描述的实施例只是本发明的一部分实施例，而不是全部实施例，基于本发明的实施例，本领域的技术人员在不付出创造性劳动的前提下所获得的其他实施例，均属于本发明保护的范围。另外，文中所提到的所有连接关系，并非单指构件直接相接，而是指可根据具体实施情况，通过添加或减少连接辅件，来组成更优的连接结构。本发明创造中的各个技术特征，在不互相矛盾冲突的前提下可以交互组合。The concept, specific structure and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments and drawings to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without exerting creative efforts are all protection scope of the present invention. In addition, all the connection relationships mentioned in the article do not only refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation conditions. Various technical features in the invention can be combined interactively without conflicting with each other.
参照图1至图4，这是本发明的实施例，具体地：Referring to Figures 1 to 4, this is an embodiment of the present invention, specifically:
一种减震平衡车，包括平衡车外壳1、左驱动机构3、右驱动机构4、减震器2，所述左驱动机构3、右驱动机构4分别设于所述平衡车外壳1的左部和右部，所述减震器2包括左减震部件21、右减震部件22，所述右减震部件22具有与所述左减震部件21一致的结构，左减震部件21的上下两端分别与平衡车外壳1的右上部、左驱动机构3铰接，右减震部件22的上下两端分别与平衡车外壳1的左上部、右驱动机构4铰接。A shock-absorbing balancing car includes a balancing car shell 1, a left driving mechanism 3, a right driving mechanism 4, and a shock absorber 2. The left driving mechanism 3 and the right driving mechanism 4 are respectively located on the left side of the balancing car shell 1. The shock absorber 2 includes a left shock absorbing member 21 and a right shock absorbing member 22. The right shock absorbing member 22 has a structure consistent with the left shock absorbing member 21. The left shock absorbing member 21 has The upper and lower ends are respectively hinged with the upper right part of the balancing car shell 1 and the left driving mechanism 3. The upper and lower ends of the right damping component 22 are respectively hinged with the upper left part of the balancing car shell 1 and the right driving mechanism 4.
上述结构的工作原理是：当左车轮带动左驱动机构3震动时，左驱动机构3与平衡车外壳1之间的相对位置发生变化，引发左减震部件21变形。不同于现有技术的是，本发明的左减震部件21不设置在左驱动机构3的正上方，而左减震部件21的上下两端分别与平衡车外壳1的右上部、左驱动机构3铰接，如此，左减震部件21本身的长度可以较长，可以发生的形变较大，因此减震效果好。当右车轮震动时，本发明的工作原理与左车轮震动时一致。The working principle of the above structure is: when the left wheel drives the left driving mechanism 3 to vibrate, the relative position between the left driving mechanism 3 and the balancing car shell 1 changes, causing the left shock absorbing component 21 to deform. Different from the prior art, the left shock absorbing component 21 of the present invention is not disposed directly above the left driving mechanism 3, but the upper and lower ends of the left shock absorbing component 21 are respectively connected with the upper right part of the balancing car shell 1 and the left driving mechanism. 3 hinge, in this way, the length of the left shock-absorbing component 21 itself can be longer, and the deformation that can occur is greater, so the shock-absorbing effect is good. When the right wheel vibrates, the working principle of the present invention is the same as when the left wheel vibrates.
进一步地，所述左减震部件21包括至少一条弹性金属条，弹性金属条两端均固接有连接头。连接头用于与其他部件连接，弹性金属条起到发生形变吸能的作用，左驱动机构3或右驱动机构4与平衡车外壳1之间的相对位置发生变化时，弹性金属条的弯曲程度随之变化，弹性金属条弯曲程度变化的过程中即可起到缓冲减震的作用。Further, the left shock absorbing component 21 includes at least one elastic metal strip, and connectors are fixedly connected to both ends of the elastic metal strip. The connector is used to connect with other components. The elastic metal strip plays the role of deformation and energy absorption. When the relative position between the left driving mechanism 3 or the right driving mechanism 4 and the balancing car shell 1 changes, the bending degree of the elastic metal strip changes. As the bending degree of the elastic metal strip changes accordingly, it can play the role of buffering and shock absorption.
进一步地，参照图4，所述左减震部件21包括四条弹性金属条，四条弹性金属条间隔设置并且整体呈矩形阵列。这样设置的好处是：增加左减震部件21、右减震部件22的减震能力，另外，由于弹性金属条的材质相同时，长径比越大，弹性金属条越不容易折断，所以采用四条较细的弹性金属条，比采用其他条件相同的一条较粗的弹性金属条有利于提高使用寿命。Further, referring to FIG. 4 , the left shock-absorbing component 21 includes four elastic metal strips. The four elastic metal strips are spaced apart and form a rectangular array as a whole. The advantage of this arrangement is to increase the shock absorption capacity of the left shock absorbing component 21 and the right shock absorbing component 22. In addition, when the elastic metal strips are made of the same material, the greater the aspect ratio, the less likely it is to break. Therefore, using Four thinner elastic metal strips are more conducive to improving the service life than using one thicker elastic metal strip under the same other conditions.
进一步地，参照图4，所述左减震部件21的其中两条弹性金属条设于右减震部件22的四条弹性金属条之间，右减震部件22的其中两条弹性金属条设于左减震部件21的四条弹性金属条之间。如此，左减震部件21与右减震部件22交错设置，可以节省空间，减薄减震器2的厚度。Further, referring to FIG. 4 , two of the elastic metal strips of the left damping component 21 are arranged between the four elastic metal strips of the right damping component 22 , and two of the elastic metal strips of the right damping component 22 are arranged between Between the four elastic metal strips of the left shock absorbing component 21. In this way, the left damping components 21 and the right damping components 22 are arranged in a staggered manner, which can save space and reduce the thickness of the shock absorber 2 .
进一步地，所述减震器2还包括连接板23，所述连接板23的左上部和右上部均设有连接部件，所述连接部件与平衡车外壳1连接，左减震部件21的上端的连接头、右减震部件22上端的连接头均与所述连接板23铰接。如此，方便平衡车的内部空间管理，方便进行平衡车的结构设计以及工厂生产时的模块化安装。Further, the shock absorber 2 also includes a connecting plate 23. The upper left part and the upper right part of the connecting plate 23 are provided with connecting parts. The connecting parts are connected to the balance car shell 1. The upper end of the left shock absorbing part 21 The connector at the upper end of the right damping component 22 is hinged with the connecting plate 23 . In this way, the internal space management of the balance car is facilitated, and the structural design of the balance car and modular installation during factory production are facilitated.
进一步地，所述连接部件包括关节轴承和连接轴，所述关节轴承固设在所述连接板23上，所述连接轴的一端与所述关节轴承连接，所述连接轴的另一端与平衡车外壳1固接。关节轴承使得连接板23与平衡车外壳1可以发生多维的相对运动，在左驱动机构3、右驱动机构4震动时，除上下方向以外的方向上的震动，也会引发弹性金属条形变，因此，可以通过弹性金属条减少除上下方向以外的方向上的震动。Further, the connecting component includes a spherical bearing and a connecting shaft. The spherical bearing is fixed on the connecting plate 23. One end of the connecting shaft is connected to the spherical bearing, and the other end of the connecting shaft is connected to the balance. The car shell 1 is fixed. The spherical bearing allows multi-dimensional relative movement between the connecting plate 23 and the balance car shell 1. When the left driving mechanism 3 and the right driving mechanism 4 vibrate, vibrations in directions other than the up and down directions will also cause deformation of the elastic metal strips. Therefore, , the vibration in directions other than the up and down direction can be reduced through elastic metal strips.
进一步地，所述减震器2还包括开口向上的连接槽体24，所述连接槽体24设于所述连接板23下方，且所述连接槽体24与所述连接板23之间设有间隙，所述连接槽体24的左部和右部分别设有左连接孔和右连接孔，所述左连接孔、右连接孔分别与所述左驱动机构3、右驱动机构4螺栓连接，左减震部件21下端的连接头、右减震部件22下端的连接头均设于所述连接槽体24内并与所述连接槽体24铰接。如此，方便平衡车的内部空间管理，方便进行平衡车的结构设计以及工厂生产时的模块化安装。Furthermore, the shock absorber 2 further includes a connecting groove body 24 with an upward opening. The connecting groove body 24 is provided below the connecting plate 23 , and there is a connecting groove body 24 between the connecting groove body 24 and the connecting plate 23 . There is a gap, and the left and right parts of the connecting groove body 24 are respectively provided with left connecting holes and right connecting holes. The left connecting holes and the right connecting holes are bolted to the left driving mechanism 3 and the right driving mechanism 4 respectively. , the connector at the lower end of the left damping component 21 and the connector at the lower end of the right damping component 22 are both located in the connecting groove body 24 and are hingedly connected with the connecting groove body 24 . In this way, the internal space management of the balance car is facilitated, and the structural design of the balance car and modular installation during factory production are facilitated.
进一步地，所述减震器2还包括连接盖板231，所述连接盖板231与所述连接板23连接，左减震部件21的上部、右减震部件22的上部均设于所述连接盖板231与所述连接板23之间。如此，方便平衡车的内部空间管理，方便进行平衡车的结构设计以及工厂生产时的模块化安装。Further, the shock absorber 2 also includes a connection cover plate 231, which is connected to the connection plate 23. The upper part of the left shock absorber part 21 and the upper part of the right shock absorber part 22 are both located on the said connection cover plate 231. between the cover plate 231 and the connecting plate 23 . In this way, the internal space management of the balance car is facilitated, and the structural design of the balance car and modular installation during factory production are facilitated.
进一步地，所述减震器2还包括左阻尼器25、右阻尼器26，所述左阻尼器25的上下两端分别与平衡车外壳1的左上部、左驱动机构3铰接，右阻尼器26两端分别与平衡车外壳1的右上部、右驱动机构4铰接。左阻尼器25、右阻尼器26具有加强减震效果的作用。Further, the shock absorber 2 also includes a left damper 25 and a right damper 26. The upper and lower ends of the left damper 25 are respectively hinged with the upper left part of the balancing car shell 1 and the left driving mechanism 3. The right damper The two ends of 26 are respectively hinged with the upper right part of the balancing car shell 1 and the right driving mechanism 4. The left damper 25 and the right damper 26 have the function of enhancing the shock absorption effect.
进一步地，所述左驱动机构3、右驱动机构4的前后两侧均设有减震器2。如此，减震效果更加好。Further, shock absorbers 2 are provided on both front and rear sides of the left driving mechanism 3 and the right driving mechanism 4 . In this way, the shock absorption effect is better.
以上对本发明的较佳实施方式进行了具体说明，但本发明创造并不限于所述实施例，熟悉本领域的技术人员在不违背本发明精神的前提下还可作出种种的等同变型或替换，这些等同的变型或替换均包括在本申请权利要求所限定的范围内。The preferred embodiments of the present invention have been specifically described above, but the present invention is not limited to the embodiments. Those skilled in the art can also make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are included within the scope defined by the claims of this application.
Claims (4)
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