阅读说明：本技术 一种可升降带驱动履带行走机构 (Liftable belt-driven crawler walking mechanism ) 是由 侯友山 吕志鸿 徐梦岩 蔡文斌 谢仲添 张晨曦 何军 于 2021-07-16 设计创作，主要内容包括：本发明提出了一种可升降带驱动履带行走机构,在陆上松软路况下,通过多级伸缩油缸的外伸依次实现多级伸缩臂及履带行走单元的外伸直至履带接触地面,该使用工况下,履带行走单元用于分担整车载荷,增大了整车车轮和履带的接地面积,降低了整车的接地比压,可改善整车在松软路况下的通过性；在水上工况下,为了降低可升降带驱动履带行走机构带来的水上阻力,可以通过控制多级伸缩油缸的收缩,从而将多级伸缩臂及履带行走单元完全收缩到车体内部,可以最大限度降低该机构的水上阻力问题,尽可能降低该机构对整车的水上航速影响。(The invention provides a liftable belt-driven crawler travel mechanism, which sequentially realizes the outward extension of a multi-stage telescopic arm and a crawler travel unit through the outward extension of a multi-stage telescopic oil cylinder until a crawler contacts the ground under the onshore soft road condition; under the operating mode on water, in order to reduce the resistance on water that liftable area drive crawler travel mechanism brought, can be through the shrink of control multistage flexible hydro-cylinder to inside contracting multistage flexible arm and crawler travel unit completely the automobile body, the resistance problem on water that can furthest reduce this mechanism can reduce this mechanism as far as possible and to the speed of a ship or plane influence on water of whole car.)

1. A liftable belt-driven crawler traveling mechanism is characterized by comprising a multi-stage telescopic arm (1), a multi-stage telescopic oil cylinder (2), a crawler traveling unit (3) and a vehicle body (7);

the upper end of the multi-stage telescopic boom (1) is fixed at the lower part of the vehicle body (7), and the lower end of the multi-stage telescopic boom (1) is fixedly connected to the crawler traveling unit (3);

the upper end of the multi-stage telescopic oil cylinder (2) is connected with the upper end of the multi-stage telescopic arm (1), and the lower end of the multi-stage telescopic oil cylinder is connected with the lower end of the multi-stage telescopic arm (1); the multi-stage telescopic oil cylinder (2) drives the multi-stage telescopic arm (1) to move through extension and contraction, and finally the retraction of the crawler belt walking unit (3) is realized;

after the crawler traveling unit (3) is placed on the ground, the vehicle body (7) is driven to complete a traveling function.

2. The liftable belt-driven crawler travel mechanism according to claim 1, wherein the crawler travel unit (3) comprises an adapter bracket (301), a bearing spring (302), a rubber crawler (303), an inducer (304), a travel beam (305), a bogie wheel (306), a travel drive motor (307), a drive disk (308), a bracket pin (309), a front bearing spring (3021), and a rear bearing spring (3022);

the front end and the rear end of the walking beam (305) are respectively connected with an inducer (304) and a driving disc (308), and the rubber crawler (303) is arranged on the inducer (304) and the driving disc (308);

the loading wheels (306) are arranged at the lower end of the walking beam (305) and are used for bearing the load of the whole crawler walking unit (3);

the walking drive motor (307) is used for driving the driving disc (308) to rotate;

the crawler traveling unit (3) is fixedly connected with the multistage telescopic arm (1) through the upper end of the switching support (301), and the switching support (301) is hinged with the upper end of the traveling beam (305) through a support pin shaft (309) at the lower end;

the bearing spring (302) comprises a front bearing spring (3021) and a rear bearing spring (3022), the front bearing spring (3021) is installed between the front side of the upper end of the adapter bracket (301) and the walking beam (305), and the rear bearing spring (3022) is installed between the rear side of the upper end of the adapter bracket (301) and the walking beam (305).

3. A liftable belt driven crawler travel mechanism according to claim 1, wherein said multi-stage telescopic boom (1) comprises an outer boom (101), a middle boom (102), an inner boom (103); the outer arm (101), the middle arm (102) and the inner arm (103) are sequentially sleeved from outside to inside and can slide relatively to form a multi-stage telescopic structure.

4. The elevating belt-driven crawler traveling mechanism according to claim 1, wherein the multi-stage telescopic cylinder (2) comprises an upper connection point (201), an outer cylinder (202), a middle cylinder (203), an inner piston rod (204), a lower connection point (205), and an oil port (206); the middle cylinder (203) is positioned in the outer cylinder (202), the inner piston rod (204) is positioned in the middle cylinder (203), the front end of the outer cylinder (202) is closed, the outer side of the outer cylinder is provided with an upper connecting point (201), and the upper end of the multi-stage telescopic oil cylinder (2) is connected with the multi-stage telescopic arm (1) through a pin shaft through the upper connecting point (201); the tail end of the inner piston rod (204) is provided with a lower connecting point (205), and the lower end of the multi-stage telescopic oil cylinder (2) is connected with the multi-stage telescopic arm (1) through a pin shaft through the lower connecting point (205); the front end of the outer barrel (202) is provided with an oil port (206) communicated to the inside of the cavity of the outer barrel, and the oil port is used for realizing oil supply and oil return of pressure oil.

5. The elevating belt-driven crawler traveling mechanism according to claim 4, further comprising an accumulator (4) filled with high-pressure nitrogen gas and communicated with the outer cylinder (202) of the multistage telescopic cylinder (2) through a pipeline.

6. The elevating belt-driven crawler traveling mechanism according to claim 1, further comprising an elevating hydraulic line (5) for supplying and returning pressure oil to the multi-stage telescopic cylinder (2).

7. A liftable belt-driven crawler travel mechanism according to claim 1, further comprising a traveling-driving hydraulic line (6) for carrying out the transportation and switching of the pressure oil of the crawler travel unit (3).

Technical Field

The invention belongs to the technical field of heavy-load special vehicles, and particularly relates to a liftable belt-driven crawler traveling mechanism.

Background

For heavy-load special vehicles, in order to improve the high-mobility of the whole vehicle universe, the passing capacity of the whole vehicle under soft road conditions such as mudflats, deserts and marshes needs to be solved urgently, the ground pressure of the whole vehicle is reduced, wheel subsidence is improved, and the whole vehicle needs to have enough driving force for overcoming the running resistance under the soft road conditions of wheel subsidence. For some amphibious vehicles, the high passing capacity of the whole vehicle in soft road conditions is improved, the sailing water resistance of the whole vehicle on water is reduced, and the normal sailing speed of the whole vehicle on water cannot be influenced.

Disclosure of Invention

In view of this, the present invention provides a liftable belt-driven crawler traveling mechanism, which can improve the high passing ability of heavy-duty special vehicles under soft road conditions.

A lifting belt-driven crawler traveling mechanism comprises a multi-stage telescopic arm (1), a multi-stage telescopic oil cylinder (2), a crawler traveling unit (3) and a vehicle body (7);

the upper end of the multi-stage telescopic boom (1) is fixed at the lower part of the vehicle body (7), and the lower end of the multi-stage telescopic boom (1) is fixedly connected to the crawler traveling unit (3);

the upper end of the multi-stage telescopic oil cylinder (2) is connected with the upper end of the multi-stage telescopic arm (1), and the lower end of the multi-stage telescopic oil cylinder is connected with the lower end of the multi-stage telescopic arm (1); the multi-stage telescopic oil cylinder (2) drives the multi-stage telescopic arm (1) to move through extension and contraction, and finally the retraction of the crawler belt walking unit (3) is realized;

after the crawler traveling unit (3) is placed on the ground, the vehicle body (7) is driven to complete a traveling function.

Preferably, the crawler traveling unit (3) comprises a transfer bracket (301), a bearing spring (302), a rubber crawler (303), an inducer (304), a traveling beam (305), a loading wheel (306), a traveling drive motor (307), a driving disc (308), a bracket pin shaft (309), a front bearing spring (3021) and a rear bearing spring (3022);

the front end and the rear end of the walking beam (305) are respectively connected with an inducer (304) and a driving disc (308), and the rubber crawler (303) is arranged on the inducer (304) and the driving disc (308);

the loading wheels (306) are arranged at the lower end of the walking beam (305) and are used for bearing the load of the whole crawler walking unit (3);

the walking drive motor (307) is used for driving the driving disc (308) to rotate;

the crawler traveling unit (3) is fixedly connected with the multistage telescopic arm (1) through the upper end of the switching support (301), and the switching support (301) is hinged with the upper end of the traveling beam (305) through a support pin shaft (309) at the lower end;

the bearing spring (302) comprises a front bearing spring (3021) and a rear bearing spring (3022), the front bearing spring (3021) is installed between the front side of the upper end of the adapter bracket (301) and the walking beam (305), and the rear bearing spring (3022) is installed between the rear side of the upper end of the adapter bracket (301) and the walking beam (305).

Preferably, the multi-stage telescopic arm (1) comprises an outer arm (101), a middle arm (102) and an inner arm (103); the outer arm (101), the middle arm (102) and the inner arm (103) are sequentially sleeved from outside to inside and can slide relatively to form a multi-stage telescopic structure.

Preferably, the multi-stage telescopic oil cylinder (2) comprises an upper connecting point (201), an outer cylinder (202), a middle cylinder (203), an inner piston rod (204), a lower connecting point (205) and an oil port (206); the middle cylinder (203) is positioned in the outer cylinder (202), the inner piston rod (204) is positioned in the middle cylinder (203), the front end of the outer cylinder (202) is closed, the outer side of the outer cylinder is provided with an upper connecting point (201), and the upper end of the multi-stage telescopic oil cylinder (2) is connected with the multi-stage telescopic arm (1) through a pin shaft through the upper connecting point (201); the tail end of the inner piston rod (204) is provided with a lower connecting point (205), and the lower end of the multi-stage telescopic oil cylinder (2) is connected with the multi-stage telescopic arm (1) through a pin shaft through the lower connecting point (205); the front end of the outer barrel (202) is provided with an oil port (206) communicated to the inside of the cavity of the outer barrel, and the oil port is used for realizing oil supply and oil return of pressure oil.

Furthermore, the energy accumulator also comprises an energy accumulator (4), wherein the energy accumulator is filled with high-pressure nitrogen and communicated with the outer cylinder (202) of the multi-stage telescopic oil cylinder (2) through a pipeline.

Furthermore, the hydraulic lifting device also comprises a lifting hydraulic pipeline (5) for realizing the oil supply and the oil return of pressure oil of the multi-stage telescopic oil cylinder (2).

Furthermore, the hydraulic oil pump also comprises a driving walking hydraulic pipeline (6) which is used for realizing the transportation and switching of the pressure oil of the crawler walking unit (3).

The invention has the following beneficial effects:

in order to solve the problems, the invention provides a liftable belt-driven crawler travel mechanism, wherein a hydraulic oil source is started under the onshore soft road condition, pressure oil is delivered into a multi-stage telescopic oil cylinder, and the multi-stage telescopic arms and a crawler travel unit are sequentially extended by the extension of the multi-stage telescopic oil cylinder until a crawler contacts the ground; under the water working condition, in order to reduce the water resistance brought by the liftable belt driving crawler travel mechanism, the multi-stage telescopic arm and the crawler travel unit can be completely contracted into the vehicle body by controlling the contraction of the multi-stage telescopic oil cylinder, so that the water resistance problem of the mechanism can be reduced to the maximum extent, and the influence of the mechanism on the water speed of the whole vehicle can be reduced as much as possible;

the bearing springs are arranged among the multi-stage telescopic arms and used for providing reverse spring force, so that the purpose of inhibiting and adjusting the pitching trend of the crawler belt walking unit is achieved, and the uniform grounding performance of the crawler belt walking unit is ensured; the quick replacement can be carried out according to the bearing change, so that the quick replacement device is suitable for different load adjustment;

the energy accumulator is arranged to be connected with the large cavity of the multi-stage telescopic oil cylinder in series, and the effects of buffering ground impact and reducing the internal pressure peak value of the multi-stage telescopic oil cylinder during running are achieved.

Drawings

FIG. 1 is a schematic view of a belt-driven elevating crawler assembly;

FIG. 2 is a schematic structural view of a multi-stage telescopic boom;

FIG. 3 is a schematic structural view of a multi-stage telescopic cylinder;

FIG. 4 is a schematic structural view of a crawler travel unit;

FIG. 5 is a schematic view of the extension/retraction of a belt-driven elevating crawler travel mechanism;

FIG. 6 is a schematic view of a hydraulic drive of a belt-driven elevating crawler traveling mechanism;

FIG. 7 is a schematic view of the multi-stage telescopic arm extending/retracting;

FIG. 8 is a schematic view of a spring loaded crawler unit.

The hydraulic lifting device comprises 1-multi-stage telescopic arms, 2-multi-stage telescopic oil cylinders, 3-crawler traveling units, 4-energy accumulators, 5-lifting hydraulic pipelines, 6-driving traveling hydraulic pipelines, 7-vehicle bodies, 101-outer arms, 102-middle arms, 103-inner arms, 104-lower hinge points, 105-upper hinge points, 106-lower fixing bolts, 107-upper fixing bolts, 201-upper connecting points, 202-outer cylinders, 203-middle cylinders, 204-inner piston rods, 205-lower connecting points, 206-oil ports, 301-switching supports, 3011-connecting holes, 302-bearing springs, 303-rubber crawlers, 304-inducer, 305-traveling beam, 306-bogie wheels and 307-traveling driving motors.

Detailed Description

The invention is described in detail below by way of example with reference to the accompanying drawings.

The invention relates to a liftable belt driving crawler travelling mechanism which comprises a multi-stage telescopic arm 1, a multi-stage telescopic oil cylinder 2, a crawler travelling unit 3, an energy accumulator 4, a lifting hydraulic pipeline 5, a driving travelling hydraulic pipeline 6, a vehicle body 7 and the like.

The multi-stage telescopic arm 1 mainly comprises an outer arm 101, a middle arm 102, an inner arm 103, a lower hinge point 104, an upper hinge point 105, a lower fixing bolt 106, an upper fixing bolt 107 and the like, wherein the outer arm 101, the middle arm 102 and the inner arm 103 are sequentially sleeved from outside to inside and can relatively slide, so that a multi-stage telescopic structure is formed; the upper end of the multi-stage telescopic arm 1 is fixedly arranged on a corresponding mounting connecting plate on the vehicle body 7 through a plurality of upper fixing bolts 107; the lower end of the multi-stage telescopic boom 1 is fixedly connected with the crawler traveling unit 3 through a plurality of lower fixing bolts 106, and the multi-stage telescopic boom 1 is provided with a mechanical locking mechanism to prevent falling. The multi-stage telescopic arm 1 plays a role in bearing and guiding.

The multistage telescopic oil cylinder 2 mainly comprises an upper connecting point 201, an outer cylinder 202, a middle cylinder 203, an inner piston rod 204, a lower connecting point 205, an oil port 206 and the like; the middle cylinder 203 is positioned in the outer cylinder 202, the inner piston rod 204 is positioned in the middle cylinder 203, the front end of the outer cylinder 202 is closed, the outer side of the outer cylinder is provided with an upper connecting point 201, and the upper end of the multi-stage telescopic oil cylinder 2 is connected with an upper hinge point 105 on the multi-stage telescopic arm 1 through the upper connecting point 201 through a pin shaft; the tail end of the inner piston rod 204 is provided with a lower connecting point 205, and the lower end of the multi-stage telescopic oil cylinder 2 is connected with a lower hinge point 104 on the multi-stage telescopic arm 1 through the lower connecting point 205 through a pin shaft; the front end of the outer cylinder 202 is provided with an oil port 206 communicated to the inside of the cavity of the outer cylinder, and the oil port 206 is connected with the lifting hydraulic pipeline 5 and used for realizing pressure oil supply and oil return. The multi-stage telescopic oil cylinder 2 achieves large-stroke extension and contraction through oil charging and discharging, so that large-stroke extension and contraction of the telescopic arm are achieved, and finally the crawler traveling unit 3 is retracted and extended.

The crawler traveling unit 3 mainly comprises a transfer bracket 301, a bearing spring 302, a rubber crawler 303, an inducer 304, a traveling beam 305, a loading wheel 306, a traveling driving motor 307, a driving disc 308, a bracket pin 309, a front bearing spring 3021, a rear bearing spring 3022 and the like; the walking beam 305 is a main body framework and is used for bearing, and all components of the crawler walking unit 3 are installed and fixed on the walking beam 305; the front end and the rear end of the walking beam 305 are respectively connected with an inducer 304 and a driving disc 308, and the rubber crawler belt 303 is arranged on the inducer 304 and the driving disc 308 and is tightly supported by a tensioner of the inducer 304; the bogie wheels 306 are mounted on the lower end of the walking beam 305 for carrying the load of the entire crawler walking unit 3; the travel driving motor 307 is a driving power source of the crawler travel unit 3, and pressure oil is supplied to the interior of the travel driving motor 307 to drive the driving disk 308 to rotate, and then the rubber crawler 303 drives the inducer 304 to rotate, thereby realizing a normal travel function of the entire crawler travel unit 3.

The crawler traveling unit 3 is fixedly connected with the multistage telescopic arm 1 through a switching bracket 301, and the switching bracket 301 is hinged with the upper end of a traveling beam 305 through a bracket pin shaft 309; the upper end of the switching bracket 301 is provided with a connecting hole 3011 for fixedly connecting with the lower fixing bolt 106 on the multi-stage telescopic arm 1;

the carrier spring 302 includes a front carrier spring 3021 and a rear carrier spring 3022, the front carrier spring 3021 is installed between the front side of the upper end of the adaptor bracket 301 and the walking beam 305, and the rear carrier spring 3022 is installed between the rear side of the upper end of the adaptor bracket 301 and the walking beam 305. The two bearing springs are used for bearing and inhibiting the pitching trend of the crawler unit 3, and the bearing spring 302 adopts a modular design, so that the spring can be replaced according to different loads, and the bearing capacity can be quickly adjusted.

The energy accumulator 4 is filled with high-pressure nitrogen and communicated with the large cavity of the multistage telescopic oil cylinder 2 through a pipeline, and the energy accumulator mainly plays a role in buffering and is used for reducing the pressure peak value inside the multistage telescopic oil cylinder 2.

The lifting hydraulic pipeline 5 mainly comprises an oil supply pipeline and an oil return pipeline, and the lifting hydraulic pipeline 5 is connected with an oil port 206 on the multistage telescopic oil cylinder 2 to realize the conveying and switching of pressure oil.

The driving walking hydraulic pipeline 6 mainly comprises a walking motor oil supply pipeline, a walking motor oil return pipeline and a walking motor oil drain pipeline, and the driving walking hydraulic pipeline 6 is connected with a corresponding oil port on the walking driving motor 307 to realize motor driving.

The assembling method of the liftable belt driving crawler traveling mechanism is explained according to the sequence:

a. the outer arm 101 and the middle arm 102 of the multi-stage telescopic arm 1 are assembled together, before the inner arm 103 is assembled, the multi-stage telescopic cylinder 2 is installed in place, specifically, an upper connection point 201 on the multi-stage telescopic cylinder 2 is connected with an upper hinge point 105 on the multi-stage telescopic arm 1 through a pin shaft, and a lower connection point 205 on the multi-stage telescopic cylinder 2 is connected with a lower hinge point 104 on the multi-stage telescopic arm 1 through a pin shaft. Finally, the inner arm 103 is mounted on the middle arm 102, and the assembly of the multi-stage telescopic arm 1 and the multi-stage telescopic oil cylinder 2 is completed;

b. and fixedly connecting the assembled crawler traveling unit 3 with the multistage telescopic arm 1. Specifically, connecting holes 3011 on the transfer bracket 301 of the crawler traveling unit 3 are connected with lower fixing bolts 106 on the multi-stage telescopic boom 1, so as to complete the fixed installation of the crawler traveling unit 3 and the multi-stage telescopic boom 1;

c. and fixedly connecting the upper fixing bolts 107 on the multistage telescopic arm 1 with corresponding mounting holes of the vehicle body 7 to finish the assembly of the liftable belt-driven crawler travelling mechanism and the vehicle body.

The specific working principle of the belt-driven caterpillar running mechanism which can be lifted is described as follows:

a. overhang control function

When the vehicle runs to soft road conditions, the liftable crawler belt walking unit needs to be controlled to extend outwards to the ground. The specific process is as follows: the controller receives a lifting control execution instruction from the CAN bus, triggers and starts the hydraulic oil source to output high-pressure oil to the large cavity inside the multi-stage telescopic oil cylinder 2, and under the action of the high-pressure oil, the multi-stage telescopic oil cylinder 2 sequentially extends the middle cylinder 203 and the inner piston rod 204 outwards, and synchronously and sequentially extends the middle arm 102 and the inner arm 103 outwards of the multi-stage telescopic arm 1. Meanwhile, oil in the small cavity of the multi-stage telescopic oil cylinder 2 is discharged back to a hydraulic oil source, so that the extending function of the crawler belt walking unit is completed.

b. Adduction control function

When the vehicle is switched to the water condition, the crawler travel unit 3 needs to be retracted into the vehicle body 7 in order to reduce the water resistance. The specific process is as follows: the controller receives a lifting control execution instruction from the CAN bus, triggers and starts the hydraulic oil source to output high-pressure oil to the small cavity inside the multi-stage telescopic oil cylinder 2, and under the action of the high-pressure oil, the multi-stage telescopic oil cylinder 2 sequentially retracts the inner piston rod 204 and the middle cylinder 203 and synchronously and sequentially retracts the inner arm 103 and the middle arm 102 of the multi-stage telescopic arm 1. Meanwhile, the oil in the large cavity of the multi-stage telescopic oil cylinder 2 is discharged back to a hydraulic oil source, so that the retraction function of the crawler traveling unit is completed.

c. Driving function of crawler unit

After receiving a driving running execution instruction from the CAN bus, the controller triggers and starts the hydraulic oil source to output high-pressure oil to the walking drive motor 307, and the walking drive motor 307 drives the driving disc 308 and the driving disc 308 to drive the rubber track 303, so that a driving running function is completed. When the vehicle is driven on a soft road, the load spring 302 is used to suppress the entire pitching of the crawler travel unit 3 from time to time, thereby ensuring good uniform grounding performance of the crawler travel unit 3. The absence of the load spring 302 would cause a pitch problem for the crawler belt unit 3.

The problem of pitch travel of the crawler travel unit 3 will be further described with reference to fig. 8. When the head of the crawler belt unit 3 tends to tilt up when the crawler belt unit 3 is driven in soft road conditions, the crawler belt unit 3 tends to rotate around the support pin 309, the front bearing spring 3021 is compressed, the rear bearing spring 3022 is stretched, the front bearing spring 3021 and the rear bearing spring 3022 both provide reverse spring force, the head tilting tendency of the crawler belt unit 3 is inhibited, and the uniform grounding performance of the crawler belt unit 3 is ensured as much as possible; when the trend of bowing over appears when 3 soft road conditions of crawler-belt unit travel, crawler-belt unit 3 can certainly be around support round pin axle 309 do the rotatory trend of bowing over, and preceding carrier spring 3021 can be stretched this moment, and back carrier spring 3022 can be compressed, then preceding carrier spring 3021 and back carrier spring 3022 all can provide reverse spring force, restrain the trend of bowing over of crawler-belt unit 3, guarantee crawler-belt unit 3's even earthing nature as far as possible.

d. Running buffer function of crawler belt walking unit

When the crawler unit 3 travels on land, when meeting the road surface arch or ground excitation great, crawler unit 3 will probably receive the perpendicular ascending effort that ground was applyed, and multistage flexible hydro-cylinder 2 will directly receive the impact of ground excitation this moment, if do not have the buffer measure, then multistage flexible hydro-cylinder 2 inside will produce high-pressure oil pressure peak value rapidly, can cause unfavorable consequences such as sealed damage and vibration impact. After the energy accumulator 4 is adopted, the energy accumulator 4 and the multi-stage telescopic oil cylinders 2 are connected in series, the internal high-pressure nitrogen compression buffering function can be fully utilized, the impact transmitted from the ground can be buffered in time, the pressure peak value and the vertical vibration acceleration can be effectively reduced, and the driving smoothness can be improved.

The invention has the beneficial effects that: the lifting belt-driven crawler traveling mechanism can be quickly lifted, retracted and unfolded, the grounding pressure and wheel subsidence of the whole vehicle under soft road conditions are reduced, and the trafficability is improved; the crawler traveling unit is provided with driving force, and can effectively assist in promoting the advancing driving force of the whole vehicle under soft road conditions. Simultaneously, the crawler traveling units are retracted into the vehicle body quickly, so that the problem of water resistance caused by the crawler traveling units under the water working condition can be reduced to the maximum extent, and the influence on the water maximum navigational speed is reduced.

In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.