CN105431346B

CN105431346B - Compact traction device

Info

Publication number: CN105431346B
Application number: CN201480042567.3A
Authority: CN
Inventors: 伊冯·马特尔
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-07-11
Filing date: 2014-06-30
Publication date: 2021-02-02
Anticipated expiration: 2034-06-30
Also published as: KR102206902B1; JP6458800B2; WO2015003262A1; BR112016000306A2; CN105431346A; EP3019389A4; CA2917718A1; EP3019389A1; HK1216872A1; BR112016000306B1; JP2016525039A; MX2016000322A; CA2917718C; KR20160032154A

Abstract

The compact device (100) comprises an elongated waterproof housing (104) extending along a longitudinal axis (105); and a track (102) disposed about the housing (104) along the longitudinal axis (105). The track (102) is capable of moving the apparatus (100) when driven in rotation about the housing (104). According to an embodiment, the device (100) may comprise: a generator/motor (202) selectively generating electrical power capable of powering external devices and driving rotation of the track (102); and/or a fuel driven engine (200). The apparatus (100) further comprises a power transmission assembly through which rotational output power is transmitted from the interior to the exterior of the housing (104) by means of at least one rotatable shaft section that sealingly extends across a corresponding one of the walls of the housing (104).

Description

Compact traction device

Cross Reference to Related Applications

This application claims the benefit of U.S. patent application No.61/844893, filed on 11/7/2013, the entire contents of which are incorporated herein by reference. The present application also relates to U.S. patent application No.13/907471 filed on day 31, 5/2013, U.S. patent application No.13/650965 filed on day 12, 10/2012 (now U.S. patent No.8528672 filed on day 10, 9/2013), U.S. patent application No.13/650925 filed on day 12, 10/2012 (now U.S. patent No.8453769 filed on day 4, 6/2013), PCT patent application No. PCT/CA2011/050202 filed on day 15, 4/2011, and U.S. provisional patent application series No.61/342538 filed on day 15, 4/2010. The entire contents of these cross-referenced applications are incorporated herein by reference.

Technical Field

The technical field of the present application relates to compact traction devices that can be exercised over difficult terrain, such as terrain covered with snow, sand, dirt, etc.

Background

In recent years, some devices capable of traveling in difficult terrain have been proposed. Many of these devices involve compact devices that can push or pull a person (e.g., a skier) with a track that is rotated by a motor. Examples can be found in document FR-2431304(Jaulmes) published on 2/15/1980 and in document US-4519470(Allisio) published on 5/28/1985. Many other examples exist. Most of these devices use a gasoline engine to drive the track to rotate. There are some devices that use electric motors. This type of equipment may be useful as a means of light transportation, particularly where it is difficult or prohibitive to travel with larger vehicles. For example, in a terrain having snow covered surfaces, the snow may be too powdery or thick to allow for a snowmobile (snowmobile). Another advantage of such a device is that it is much simpler and more convenient to transport the device on another vehicle than a larger and heavier vehicle, such as a snowmobile.

Unfortunately, none of the devices mentioned above are disclosed as being entirely well suited for use in locations where the winter conditions encountered during certain times of the year are very severe, where such devices would likely be useful. For example, very cold temperatures can greatly reduce the reliability and maximum travel of a battery powered device in its electric motor. In the case of gasoline engines, the combination of cold weather and heat released from the engine can result in ice and heavy snow accumulation in sensitive parts of the equipment. In addition, milder temperatures can cause water to seep into the equipment, resulting in failures that are difficult to repair, especially when failures occur far into the forest or in places that are not easily accessible.

The aforementioned devices also do not conveniently carry the generator to hard to reach places. Several other limitations are also existing challenges.

The compact traction apparatus and method disclosed in applicant's PCT/CA2011/050202 filed 2011, 4, 15 (published as WO2011/127607 on 10, 20, 2011) provide a very elegant solution capable of overcoming the numerous limitations and challenges associated with the previously proposed apparatus. Nevertheless, there is always a need and desire for improvements in many different aspects of the basic concepts in order to further improve upon the art in this field.

Disclosure of Invention

According to one aspect, there is provided a compact pulling apparatus comprising: an elongate waterproof housing extending along a longitudinal axis, the housing having a plurality of outer walls; a track disposed outside of the housing along the longitudinal axis and configured to move the apparatus when the track is driven to rotate about the housing; at least one track-driving motor for generating rotational output power for moving the tracks, the at least one track-driving motor being longitudinally disposed within the housing; and a power transmission assembly supported by the housing and establishing torque transmitting engagement between the at least one track-driving motor and the track, the power transmission assembly comprising: a longitudinally disposed main drive shaft positioned at least partially within the housing; a transverse drive axle; and a gearbox having an input and an output, the input being drivingly connected to the longitudinally arranged main drive shaft and the output being drivingly connected to the transverse drive axle; wherein the rotational output power is transmitted from the interior of the enclosure to the exterior of the enclosure through the power transmission chain assembly using at least one rotatable shaft section that sealingly extends through a corresponding one of the plurality of outer walls of the enclosure.

According to another aspect, a compact pulling apparatus is provided as shown and/or as described and/or as taught.

According to another aspect, a method for ventilating a compact pulling apparatus as shown in the figures and/or as described and/or as taught is provided.

According to another aspect, a method for constructing a compact pulling apparatus as shown in the figures and/or as described and/or as taught is provided.

The details of the various aspects and features of the proposed concepts will become apparent from the following detailed description with reference to the accompanying drawings.

Drawings

FIG. 1 is an isometric view of an example of a compact pulling apparatus made in accordance with the present concepts;

FIG. 2 is a side view of an example of a device similar to the device shown in FIG. 1 but configured for use with a hanging ski;

FIG. 3 is a left side view similar to the device of FIG. 1;

FIG. 4 is a rear isometric view of the apparatus shown in FIG. 1, with some components of the apparatus not shown for illustrative purposes;

FIG. 5 is a schematic top view depicting an example of a motor configuration inside the apparatus shown in FIG. 1;

FIG. 6 is an isometric view of the apparatus of FIG. 1 with the side plates removed;

FIG. 7 is a semi-schematic view showing an example of air circulation within the apparatus of FIG. 1; and

FIG. 8 is an isometric view of another example of a compact pulling apparatus made in accordance with the present concepts.

Detailed Description

Fig. 1 is an isometric view of an example of a compact pulling apparatus 100 of the basic proposed concept. The apparatus 100 comprises an endless track 102 arranged around a watertight housing 104 having an elongated form. The housing 104 extends along a longitudinal axis 105. The tracks 102 rotate about the exterior of the housing 104 to enable the apparatus 100 to move over a ground surface, such as a snow-covered ground surface. The track 102 may be made of rubber or other polymers. Other materials may also be used. The apparatus 100 may be used on virtually any surface (e.g., paved roads, sand, etc.).

It is noted at this point that the expression "waterproof" casing means that its construction is waterproof, but does not exclude the presence of a ventilation circuit inside the casing 104. For example, the ventilation circuit enables cooling of the interior of the enclosure 14 when the temperature of the interior of the enclosure exceeds an upper threshold (such as above 25 ℃). Other temperature values are also possible. The ventilation circuit may also be used to keep the interior of the enclosure 104 warm in cold weather conditions.

The exterior of the device 100 as shown in fig. 1 is substantially similar to that shown previously by the applicant in the application published as WO2011/127607 at 10/20/2011. However, the apparatus 100 includes many improvements over the apparatus disclosed in the previous application.

The illustrated apparatus 100 includes at least one track-driven motor for generating rotational output power to move the tracks 102. The motor is longitudinally disposed within the housing 104 and may be, for example, a fuel-driven internal combustion engine and/or an electric motor. The apparatus 100 of the illustrated example includes an engine and an electric motor. Further, an electric motor is an electric machine having both a power generator mode, in which it is capable of generating electricity using rotational output power from a mechanical source, and an electric motor mode, in which it is capable of generating rotational output power using electricity from a battery. Nevertheless, an electromechanical machine that is only an electric motor (i.e., no generator mode) may also be used in some embodiments, or only a generator (i.e., no electric motor mode) in other embodiments. The apparatus shown in fig. 1 may also include only an electric motor without an engine (i.e., purely electric) or only an engine (i.e., without an electric machine therein).

For simplicity, the electric machine will be referred to as a "motor/generator" in this specification. The expression "motor/generator" is used in a general form and is meant to cover an electric machine having only a motor mode, only a generator mode, or both. Other modes are also possible.

The device 100 includes a handle 106 coupled to the housing 104. The handle 106 extends generally toward the rear of the device 100. The distal end of the handle 106 includes an armrest 108 for being held by an operator 110 standing at the rear of the apparatus 100, such as shown in semi-schematic form in fig. 1. The proximal end of the handle 106 may be pivotally or fixedly coupled to the left and right sides of the housing 104, as desired. When pivoting, the pivoting angle of handle 106 may be limited between a minimum angle and a maximum angle with respect to the horizontal, for example, using a stop or the like. It may be desirable to utilize this structure to prevent the distal end of handle 106 from contacting the ground. Several variations are also possible.

Operator 110 has one or more control devices that may be provided on handrail 108 of handle 106 that enable, among other things, control of the speed of travel and other functions of apparatus 100. The controls may be connected to the housing 104 using wires and/or through a wireless communication device. If desired, the wires may extend internally between the proximal and distal ends of the handle 106, thereby protecting the wires from wear and tear.

It should be noted that handle 106 may be omitted in some embodiments, such as where device 100 is part of another machine. Two or more devices 100 may also be used in the same machine.

In fig. 1, an operator 110 of the apparatus 100 stands on a sled 112 (or equivalent). The operator 110 grips the handle 106 with the armrest 108 so as to be pulled by the apparatus 100 as it moves forward. Operator 110 may change the orientation of device 100 by moving handle 106 laterally in a direction opposite the direction of the turn. This operation is similar to the action taken by an operator using a conventional small mower or the like. When the sled 112 is used to travel on snow or ice, the operator 110 may follow the device 100 in a walking manner, or even follow the device 100 with a wheeled device in the sled, depending on the ground conditions. For example, the pulley means may comprise a pull-type unit operatively connected behind the housing 104. The traction unit may include a ground-engaging tire and an upper platform disposed above the ground-engaging tire for receiving the feet of a standing operator 110. Many variations are possible.

The housing 104 is of the underhung (low-slung) type in order to keep its centre of gravity as low as possible. The center of gravity of the device 100 is relatively low. In fig. 1, it is at a height below the knees of operator 110.

Depending on the mode, means may be provided to enable the apparatus 100 to reserve its own motor energy. This may be very useful in some cases. One or more levers or other types of control devices may also be provided to operate the brakes. For example, a lever may be provided on the handle 106 (the lever for example being similar to a brake provided on a bicycle or motorcycle). Other elements may also be provided on the handle 106, such as lights, an indicating compass, etc., as desired. Other configurations and arrangements are also possible.

The housing 104 includes lateral walls 140 on each side. The housing 104 may be made of a metal material and/or a plastic material, for example. Aluminum (including alloys of aluminum) is one example of a possible material for the housing 104 because it is lightweight and strong. Other materials are also possible. The lateral walls 140 may be fixed or removable. Alternatively or in addition to the use of a side door, a removable lateral wall 140 may facilitate access to all components within the housing 140. When the device 100 is moved, the lateral walls 140 on the sides of the housing 104 close in a watertight manner. They may be bolted and/or otherwise attached to the rest of the housing 104. Other components of the housing 104 are configured to prevent water intrusion and thus keep the interior of the housing 104 dry during operation.

Fig. 2 is an isometric view of an example of the apparatus 100 similar to fig. 1, but configured for use with a hanging ski 120 on which the user 110 stands at the rear of the apparatus 100. The ski 120 includes a suspension member 122 that is connected to a support member 124, which in the example shown has the form of a straight transverse strut. The cross brace 124 may also be slightly curved toward the rear at its center. The cross brace 124 is supported by two corresponding side plates 126 that project toward the top of the housing 104. The pendant 122 of the ski 120 includes two retention arms that are attached to the front plate 128 and are pivotable about a generally vertical axis at which the front plate 128 is joined with a fastening element 130. The fastening element 130 can be slid left and right along the transverse strut 124, for example by means of two pulleys provided on either side of the fastening element 130. Thus, the fastening member 130 is able to move towards one end of the cross strut 124, which facilitates handling of the apparatus 100 and reduces the effort required by the operator 110. Side-to-side movement (roll) of the ski 120 may be transferred to the housing 104 and vice versa. The operator 110 can control the side-to-side rolling action of the device 100 by transferring his body weight laterally on the ski 120. However, the motion about the pitch axis (pitch axis) and yaw axis (yaw axis) is still free between the device 100 and the ski 120. Various modifications are possible.

The illustrated ski 120 is primarily designed for use with frozen surfaces, such as snow or ice. However, it may also be used on other types of ground, such as grass-covered surfaces, loose soil, sand, etc. Wheels may also be provided under the skis 120 to enable long distance travel on asphalt or stone-paved roads. Other variations are also possible.

When traveling forward, the apparatus 100 pulls the operator 110 along with it and also transports the payload when needed, such as a payload placed on a sled 120 that is hitched to the apparatus 100 and/or placed in an external cradle above the tracks 102. Such a device 10 is able to easily pull a load equivalent to twice its own weight in the snow in powder form. The external braces may be supported, for example, by additional side panels 126, the side panels 126 being provided at different locations on the top of the enclosure 104, as shown. Variations are also possible.

The device 100 can easily pull a load equal to at least twice its own weight on snow. For example, tests conducted using an apparatus weighing about 135kg (300lbs) have shown that such an apparatus 100 is capable of pulling a load weighing 450kg (1000lbs) over a distance of about 640km (400 miles) at an average speed of about 14km/h (9MPH) with a single fuel tank containing 60 liters of fuel. When towing moderate loads, the apparatus 100 can travel a distance of about 1200km (750 miles) at an average speed of about 20km/h (12.5MPH) with a single fuel tank containing 60 liters of fuel.

The device 100 is widely used. One of them relates to search and rescue emergency tasks, in particular those corresponding to accidents occurring in difficult and/or unstable terrains, confined spaces or in dangerous areas. Some operations may even be performed in environments with all of the above difficulties. One example is rescue missions in underground environments (e.g. mines or caverns) where victims need to be pulled out of the hazardous area by rescuers and transported over a distance to the surface through narrow passages. Another example is rescue missions after an avalanche, when the surrounding environment is rather unstable. It is the noise minimization and the time spent in the scene that is the key factor.

Each accident has some consistent characteristics and potential hazards for rescue teams. Thus, in any life threatening situation, there is always a need to be able to conduct search and rescue operations with maximum efficiency under many difficult conditions. The device 100 can help achieve this goal. By means of the device 100, a rescuer can quickly access remote sites even in very difficult environments, bring search and rescue equipment and supplies, serve to find and/or stabilize a victim, relieve him from an imminent danger, and transport him with a stretcher elsewhere, for example another evacuation vehicle and/or other medical personnel. Relieving the victim from the impending danger includes, for example, pulling someone away from the cave or cliff with a rope attached to the apparatus 100 and pulled with the apparatus 100. Then, the victim can be placed on a sled or the like for evacuation. Search and rescue equipment and supplies that may be carried by the apparatus 100 include medical supplies, mobile life supplies, rescue equipment (e.g., ropes, harnesses, shovels, life saving devices, blankets, and fire extinguishers, as well as electronic devices such as sensors, telecommunications devices, Global Positioning Systems (GPS), etc., and any other kind of supply that may be needed, including other items such as tents, food and water, heaters, etc.

Fig. 3 is a left side view of the device 100 shown in fig. 1.

Fig. 4 is a rear isometric view of the apparatus 100 shown in fig. 1. For illustrative purposes, the apparatus 100 is shown without the tracks 102, without the lateral walls 140 on both sides of the housing 104, and without some components inside the housing 104. As shown, in addition to the left and right lateral walls 140, the housing 104 includes a top wall 142, a bottom wall 144, a front wall 146, and a rear wall 148. In the example shown, a rear interior wall 150 separates a front interior chamber 152 from a rear interior chamber 154 in the interior of the housing 104. The rear interior wall 150 may be configured to reinforce the structure of the outer shell 104. Variations are also possible. For example, the outer shape of the housing 104 may be different than shown. The interior of the housing 104 may be different than shown. The interior of the housing 104 may be configured to have a single interior chamber or more than two interior chambers.

At least one front roller can be rotatably connected at the front of the housing 104 for supporting and flexing the track 102 about a lateral axis. In the example shown, two spaced apart front rollers 162 are provided. The front rollers 162 are mounted coaxially about a front transverse axle 164 (fig. 5), which is supported, for example, by an internally greased axle connected at the ends to two opposed longitudinally extending front side plates 166. The front side plate 166 is rigidly connected to the front of the housing 104. The front rollers 162 are configured and arranged to engage the inside of the track 102. Similarly, at least one rear roller is rotatably connected at the rear of the housing 104 for supporting and flexing the track 102 about a lateral axis. In the example shown, two rear rollers 170 are provided. The rear rollers 170 are mounted coaxially about a rear transverse axle 172 supported at its ends by bearings 178 at two opposed longitudinally extending rear side plates 174. The rear side plate 174 is rigidly attached to the rear of the housing 104. The rear rollers 170 are configured and arranged to engage the inner side of the track 102. The roller 170 is shown as being flat on its circumference, but teeth may be provided around the roller 170 in some embodiments. Other devices and configurations may also be provided to support the track 102 around the housing 104.

In the illustrated example, a pair of upper slide rails 160 are longitudinally disposed on the outer top side of the top wall 142. A pair of lower slide rails similar to the slide rails of the top wall 142 are longitudinally disposed on the outer bottom side of the bottom wall 144. The slide rail is made of a narrow strip of material having a very low coefficient of friction. They allow the track 102 to rotate about the housing 104 with reduced friction between the inner face of the track 102 and the outer side of the housing 104. They also act as guides to keep the tracks 102 aligned with the longitudinal axis of the apparatus 100. The slide rails 160 may extend a few centimeters beyond the front and rear ends of the top and

bottom walls

142, 144 to support the tracks 102 along substantially the entire length of the apparatus 100. As shown, these ends are curved. If desired, the skid rails 160 may be used with one or more pairs of smaller rollers and/or wheels operatively connected to the housing 104 and engaging the inner face of the track 102. These small rollers and/or wheels may further reduce friction between the inner face of the track 102 and the outer side of the housing 104, particularly when the apparatus 100 is used on a sand-covered surface. Variations are possible.

As shown in fig. 1-3, a front bumper 168 is provided at the front of the illustrated apparatus 100. The opposite end of the front bumper 168 is connected to the lateral wall 140. In the present embodiment, the front bumper 168 is removed when the lateral wall 140 is removed. Sufficient clearance is provided between the interior of front bumper 168 and front roller 162 to prevent track 102 from interfering with front bumper 168 when apparatus 100 is in operation. The apparatus 100 may be constructed without a bumper.

As shown in fig. 4, the bottom side of the housing 104 is convex at its center, and the front of the bottom wall 144 defines an angle with respect to the horizontal. In the illustrated example of the apparatus 100, the elevation is about 3cm at the front and rear of the tracks 102. The central portion corresponds to about one third of the length of the housing 104. In particular, the raised configuration facilitates a yaw action when turning the apparatus 100 on hard and rough ground (e.g., on asphalt or cement pavement) or manually pivoting the apparatus. The front transverse axle 164 is taller than the rear transverse axle 172. This facilitates the passing of obstacles. Variations are also possible.

The apparatus 100 includes a power transmission assembly supported by a housing 104 and establishing torque transmitting engagement between a motor driving a track within the housing 104 and a track 102 outside the housing 104. Using the rotational output power from the track-driving motor inside the housing 104 to rotate the tracks 102 will enable the apparatus 100 to move over the ground.

The power transmission assembly includes a longitudinally disposed main drive shaft 270 at least partially disposed within the housing 104. A substantial majority, if not all, of the drive shaft 270 is located within the housing 104.

The drive shaft 270 may be in the form of a single unitary tube or may include two or more portions with intervening mechanisms, such as clutches, etc., therebetween. The power transmission assembly also includes a gearbox 302, which may be positioned inside or outside the housing 104. The gearbox 302 has an input and an output. The input is drivingly connected to a longitudinally disposed main drive shaft 270. The output is drivingly connected to the transverse axle.

In the illustrated example, the rear rollers 170 are rollers that drive the tracks 102 with rotational output power from a track-driving motor inside the housing 104. The rear wall 148 of the housing 104 retains a sealed bearing 180 that is provided to seal the junction around the rear end of the rear portion 274 of the drive shaft 270 that extends from the housing 104. This feature is desirable in order to be able to maintain the interior of the housing 104 sealed and prevent dust and/or water from entering the housing. There is no chain out of the housing 104 through the open aperture. The outboard portion of the drive shaft 270 is drivingly connected to the gearbox 302 to which the rear transverse axle 172 is drivingly connected. In this example, the gearbox 302 is located outside the housing 104. It is also positioned near the center of the transverse axle 172. Variations are possible.

Instead of bearings on the rear wall 148, a driveable sealing arrangement may also be used. The bearing may also be disposed within the housing 104.

It should be noted that the configuration of the apparatus 100 may be designed such that the front transverse axle 164 is the axle that drives the track 102. In other embodiments, the tracks 102 may be driven from the side of the housing 104, rather than from the front and/or rear thereof, and the gearbox 302 is located inside. A transverse drive axle extends on one or both sides of the housing 104, which may be used to establish torque transmitting engagement with the track 102. The end of the transverse drive axle extending through the lateral wall 140 may include a sealed connection with the corresponding lateral wall 140. Other variations are also possible.

The transmission 302 of the illustrated example includes an internal reduction gear mechanism between the input and the output. It is therefore configured to reduce its output and the rotational speed between the outputs, thereby increasing the torque in the same proportion. Thus, the rotational speed of the drive shaft 270 is faster than the rotational speed of the rear cross axle 172. Thus, the internal speed reduction gear mechanism may for example comprise a worm meshing with a corresponding gear. This arrangement also allows for a vertical arrangement between the input and the output. Various modifications are possible. A speed reduction arrangement within the housing 104 may also be used, which includes a gearing mechanism and/or no change in the gear ratio between the input and output of the gearbox 302.

Further, the internal reduction gearing of the gearbox 302 may include internal gears having a self-locking configuration. Thus, the transmission 302 is self-locking in the park mode unless its input is rotated by the drive shaft 270. In other words, the external torque applied at its output does not allow the input to rotate. This feature is useful, for example, to prevent the device 100 from moving on a steep slope by gravity. The mechanism may be self-locking with a steeper angle between the rotating elements. Variations are possible and this feature may also be omitted entirely in some embodiments.

In the illustrated example, the rear transverse axle 172 may include a brake disk 176. Corresponding brake pads are attached to the housing 104 and mounted to a movable system that can be actuated by an operator 110 from an armrest 108 when braking force is required. Other configurations and arrangements are also possible. For example, a brake disc may be included within the housing 104 coaxially disposed on and rigidly coupled to the drive shaft 270. This may keep the brake disc 176 and its corresponding brake pads clean and dry.

Fig. 5 is a schematic top view depicting a motor configuration within the apparatus 100 shown in fig. 1. The view need not be to scale.

As shown, the apparatus 100 has a generator/motor 202 coaxially mounted directly on a main longitudinally disposed main drive shaft 270. Thus, to save weight, the rotor of the generator/motor 202 is integrally formed with the drive shaft 270. The main drive shaft 270 extends between the output of the engine 200 and the gearbox 302 to which the rear transverse axle 172 is drivingly connected. The illustrated apparatus 100 also includes an engine 200, as described above. A crankshaft within the engine 200 has a crankshaft axis of rotation that is oriented substantially parallel to the longitudinal axis 105, and a forward end of the drive shaft 270 is coupled with an output of the engine 200.

Clutches (e.g., electric clutches and/or centrifugal clutches) may be provided on and/or at the ends of the main drive shaft 270 to selectively engage or disengage various components depending on the mode of operation. Each clutch allows coupling and decoupling of the components connected thereto by torque transferring engagement. The clutch may also be a one-way mechanism.

In various possible embodiments utilizing the concepts shown in FIG. 5, including the use of an engine 200 and a generator/motor 202, the generator/motor 202 has a power generator mode (i.e., a non-electric motor mode). The apparatus 100 may include a first clutch 272 (e.g., a centrifugal clutch) located between a rear end of a front portion of the main drive shaft 270 and a front end of a rear portion of the drive shaft 270. In fig. 5, the rear portion 274 of the drive shaft 270 is disposed between the first clutch 272 and the gearbox 302. The first clutch 272 is engaged only when the output shaft of the engine 200 is rotating at a minimum rotational speed (e.g., 1500RPM) and compensates for the rotational speed difference in transmission. Other values may also be used. In this way, the engine 200 may be operated at idle speed without moving the apparatus 100.

The first clutch 272 may also be configured to remain disengaged while the engine 200 provides torque to the motor/generator 202 to generate electricity without moving the apparatus 100. Then, the rotational speed for power generation may be lower than the minimum rotational speed at which the first clutch 272 is engaged. Nonetheless, an electrically actuated clutch or other sort of arrangement may be used, including a manually actuated clutch, rather than a centrifugal clutch, to selectively engage or disengage the drive connection between the output of the engine 200 and the input of the gearbox 302.

Other embodiments include the use of an engine 200 and a generator/motor 202 as shown, the generator/motor 202 being configured or arranged to have a power generator mode and an electric motor mode.

A second clutch 276 may be provided between the engine 200 and the generator/motor 202, if desired. The second clutch 276 may be provided, for example, between the output of the engine 200 and the front end portion of the drive shaft 270. It should be noted that the use of "first" and "second" herein is for clarity, and has no implied meaning.

The second clutch 276 can be a centrifugal clutch and/or a remotely operated clutch and/or a one-way clutch. For example, the apparatus 100 may be configured such that its action at low speed (e.g., 20km/h) uses only torque from the generator/motor 202. Other speed values are also possible. Then, to achieve a faster speed, the engine 200 will start and/or idle the output of the engine 200 into driving engagement with the main drive shaft 270. The apparatus 100 may also include provisions for the operator 110 to place the apparatus 100 in an "electric only" mode, for example, to reduce noise, even though the engine 200 is still available.

If desired, the engine 200 may be started using the generator/motor 202 and/or a dedicated starter (e.g., an electric starter mounted thereon). Starting the engine 200 with the motor/generator 202 constitutes another possible mode — a starter mode. The starter mode makes it unnecessary to use a special starter, but one can still use it for some reason. If the second clutch 276 is a one-way clutch, the apparatus 100 may be configured to support the motoring mode using the generator/motor 202. It should be noted that the embodiments discussed in this paragraph may be used with or without the first clutch 272. Thus, motor/generator 202 is used as the only mechanism that powers the motion of apparatus 100 in the opposite direction. Nevertheless, engine control means may be used to reverse the rotation of the engine 200 to drive the apparatus 100 in the opposite direction. In this manner, the use of a reversing gear train may be eliminated to save weight and cost. Nevertheless, various modifications may be made.

In another possible embodiment, no clutch is provided and the main drive shaft 270 may be configured to extend uninterrupted from the engine 200 to the gearbox 302. The generator/motor 202 may be configured to always initiate operation of the apparatus 100 and simultaneously start the engine 200, for example. The engine 200 may be stopped each time the movement of the apparatus 100 is not fast enough to at least reach an idle speed at the engine 200. Once the apparatus 100 is active and the engine 200 is started, the generator/motor 202 may be used in a power generator mode instead of an electric motor mode to generate electricity to, for example, charge a battery. The generator/motor 202 may also be used again as an electric motor mode if additional power is required, such as when the apparatus 100 is towing a heavy load and/or when climbing a steep grade is required. According to embodiments, the transition between the electric motor mode and the motor generator mode may be accomplished automatically and/or manually. This "hybrid" operation may be desirable in order to optimize the use of fuel and the power delivered by the apparatus 100. Various modifications may also exist.

Another embodiment includes using the engine 200 and the generator/motor 202 as shown, with the generator/motor 202 being constructed or arranged to be selectively operable as either a power generator mode or an electric motor mode, as desired. This embodiment is similar to the embodiment described in the preceding paragraph, but in this embodiment a first clutch 272 is provided. As previously described, the first clutch 272 may be a centrifugal clutch and/or a remotely operated clutch. As such, the engine 200 may drive the generator/motor 202 in a power generator mode without moving the apparatus 100.

Still desirably, the primary drive shaft 270 may be configured to use two coaxially disposed shaft portions. The rotor of the generator/motor 202 may be connected to the outer shaft portion and the output shaft of the engine 200 will engage the inner shaft portion. A clutch may be provided between the inner and outer shafts to selectively engage or disengage the inner and outer shafts from one another. The outer shaft portion may be disengaged from the inner shaft portion to avoid unwanted rotation of the rotor within the generator/motor 202 when the engine 200 is driving the apparatus 100 but torque from/to the generator/motor 202 is not required. Such that the inner shaft portion is disengaged from the outer shaft portion, which may drive the apparatus 100 in motion without the engine 200.

Fig. 6 is an isometric view of the apparatus 100 shown in fig. 1 with the side panel 140 removed. As shown, a substantial portion of the generator/motor 202 is located in the rear interior chamber 154 of the housing 104. The engine 200 is located entirely within the forward interior chamber 152 of the apparatus 100. Various modifications may also exist.

Three batteries 206 may be disposed within the front interior chamber 152 in the illustrated example. It will be noted that the device 100 may be designed with a single battery (a single battery). However, for the sake of brevity, the term "batteries" is commonly used in plural. It is also intended to cover the case where there is only a single battery.

The battery 206 provides electrical power to the motor/generator 202 when in the electric motor mode of operation, and stores electrical power when in the power generator mode of operation. The battery 206 may also provide power to an electric starter of the engine 200, if applicable. In some embodiments, the operator 110 may start the engine 200 without directly accessing it (e.g., by removing one of the lateral walls 140 to start the engine manually, using a pull cord, etc.). When the engine is operating in a power generator mode, the battery 206 may store electrical power from the generator/motor 202. The generator/motor 202 may generate electricity using mechanical power from the engine 200 even when the apparatus 100 is in motion.

When operating in the power generator mode, the electrical power generated by the generator/motor 202 may be used to power one or more external devices, such as with one or more electrical outlets mounted on and/or within the device 100. In particular, the power may be at a voltage corresponding to a household outlet (e.g., 110V or 220V/240V at 60Hz or also at 50 Hz). Being able to generate electricity using the apparatus 100 can be very advantageous to users in many situations, such as workers who need to use power tools in remote areas or farmer houses in farmhouses located remotely from populated areas. Many other uses are also envisioned. An electric generator/motor 202 having a power of 4000W to 6000W may be installed in the apparatus 100 having the illustrated size. Smaller or larger generators may also be installed. The device 100 may also include an inverter or the like to provide external power using only the battery 206.

In generating power for external devices, one or both lateral walls 140 of the device 100 may be removed for cooling. Various modifications are possible.

Fig. 6 also shows an example of a control panel 306 for power management of the device 100 at the time of power generation. The control panel 306 includes switches, dials, electrical outlets, and the like. Which may be located inside or outside of side panel 140. Positioning the control panel 306 inside the device 100 prevents the control panel from being damaged by water, dirt, and/or impact during movement of the device 100. The control panel 306 may be accessed by removing the side panels and/or by opening the hinged cover 132 (fig. 3) in front of the control panel 306. The cover 132 has a hinge at the top edge so that when the cover 132 is opened, it can protect the control panel 306 from rain.

FIG. 6 shows an outer fuel tank 204 mounted around the top of the housing 104 and the tracks 102. The outer fuel tanks 204 are supported by the side plates 126. It is also possible to provide an external cradle instead of the external fuel tank 204 and use only the fuel tank located within the housing 104. Fuel tanks within the housing 104 and an outer fuel tank 204 may also be used. The external carrier may be used to carry cargo, such as a tool box and/or cargo box and/or an external battery. For example, the schematically illustrated outer fuel tank 204 may hold approximately 60 liters of fuel. Fuel is supplied to the engine 200 through a fuel line that is constructed and arranged to provide fluid communication between the outer fuel tank and the interior of the housing 104. When the external batteries are located on the external support, wires may be provided to form electrical connections between the external batteries and the interior of the housing 104. Various modifications are possible.

Different arrangements may be used to introduce fresh air into the interior of the enclosure 104. Depending on the embodiment, different configurations may be used in order to mitigate or even eliminate the risk of foreign matter (e.g., water in the form of liquid and/or snow or ice particles, solid debris and/or particles such as rags, leaves, sand, etc.) entering the enclosure 104. These contaminants can be entrained with the air through the air inlet.

Fig. 7 is a semi-schematic view showing air circulation inside the apparatus 100 shown in fig. 1. The battery 206 and control board 306 are removed for illustrative purposes. As shown, the generator/motor 202 is cooled by drawing fresh air into the rear interior chamber 154 from an air inlet slot 310 provided near the distal end of the handle 106 of the device 100. They are therefore relatively high above ground. The handle 106 includes hollow tubes 312, and the proximal ends of these tubes 312 open into the rear interior chamber 154.

The handle 106 may be pivotally connected to the housing 104 or fixed in place. Air inlet slot 310 is positioned relatively high from the ground to minimize the potential intrusion of water, snow or solid debris. The air inlet slots 310 are also located on the sides of the corresponding hollow tube 312 to prevent the ingress of dirt and/or snow when the handle 106 is somehow dropped on the ground. Various modifications may also exist.

In the example shown, the generator/motor 202 has a front section 304 that protrudes from the interior of the front interior chamber 152 through an opening in the rear interior wall 150. The front section 304 corresponds to an outlet of the internal air cooling circuit of the generator/motor 202. The cooling air circulating inside the housing of the generator/motor 202 is discharged within the forward interior chamber 152 through the air outlet at the forward section 304. The motor/generator 202 includes an internal fan that is driven to rotate as the rotor within the motor/generator 202 turns. The air is then circulated through the air passages, forming a cooling circuit for the motor/generator 202. The air exits on the opposite side of the motor/generator 202. The warmer air from the motor/generator 202 may be used elsewhere in the housing 104, for example, to keep the battery 206 warm in cold weather environments. Various modifications are possible.

In the example shown, the engine 200 includes a front air inlet 320. The front air inlet 320 is in direct fluid communication with the rear interior chamber 154 via an air conduit 322. The front air inlet 320 of the engine 200 is covered by a shroud 324 to which one end of an air duct 322 is connected. The opposite end of the air duct 322 is connected to the perimeter of a hole 326 (fig. 4) through the rear inner wall 150. In the example shown, the cooling air for engine 200 is entirely from aft inner chamber 154. The cooling fan in the engine 200 generates the necessary suction-suction air through the holes 326 and the air duct 322. The cooling air passes around the cylinders of the engine 200 and terminates inside the forward interior chamber 152. Air for combustion may be drawn directly from the forward interior chamber 152. It may also draw from the rear compartment 154. Other variations are also possible.

One advantage of the above arrangement is that the air used for combustion within the engine 200 is preheated and relatively dry. The engine 200 can thus be operated for extended periods of time in very cold weather conditions, and the risk of ice and snow buildup that could potentially damage the engine 200 is mitigated, if not eliminated altogether.

The illustrated apparatus 100 is designed such that the front interior chamber 152 is maintained under positive air pressure during operation. This may be achieved, for example, by providing a smaller air outlet area than the air inlet area. For example, an air outlet slot 330 between the front interior chamber 152 and the exterior of the apparatus 100 may be used. These air outlet slots 330 may be disposed through the side wall 140 of the apparatus 100, as shown in fig. 3, and are smaller in size than the hollow tube 312. Various modifications are possible. For example, air may exit from the front interior chamber 152 through an outlet tube having an upper end above the top of the track 102 and/or through an air outlet on the handle 106. Handle 106 may also have air inlet slots 310 and air outlet slots by, for example, having one hollow tube 312 act as an inlet and the other hollow tube 312 act as an outlet. If desired, the apparatus 100 may also be provided with one or more snorkels to draw air into the housing 104 and/or expel it from the housing 104. The vent tube may be provided on the outside of the lateral wall 140 and extend upwardly to block water ingress, for example, when the apparatus 100 is used on very wet ground and or a path must be taken through most of the housing 104 that will be temporarily underwater. Such scenarios are typically encountered where a shallow stream or body of water must be traversed to reach a destination. Many other configurations and arrangements may be devised.

The positive pressure generated in the front chamber 152 improves the water resistance of the housing 104. The housing 104 may have a very waterproof construction up to the level of the air entry slot 310 on the handle 106. A positive pressure is maintained in the interior of the front interior chamber 152 to mitigate the risk of water leakage at locations that may be considered to be not completely waterproof.

If desired, a series fan may additionally be provided on the flexible duct connected to the air inlet and air outlet, which may further increase the air flow if the temperature within front interior chamber 152 becomes excessive. These fans can be switched on automatically by a thermostat provided with a temperature sensor. The fan may also be located inside the hollow tube 312 of the handle 106. Other configurations and arrangements are also possible.

A small space is provided between the sides of the battery 206 and the inner side of the lateral wall 140. Air may circulate in this space up to front wall 146 and then back on the opposite side between front wall 146 and front inner wall 156. The top and bottom sides of the cells 206 (if desired) may be sealed, for example, using foam strips or the like, to create a circumferential air circuit. Air from the motor/generator 202 circulates around the engine 200 to capture the radiated heat before entering the air circuit around the battery 206.

As shown, an inner wall is provided between the engine 200 and the battery 206. Motorized shutters may be used on the sides of the inner wall to selectively open and close the air circuit around the batteries 206. In the event that the battery 206 is warm enough, the air circuit needs to be shut down to prevent the battery from overheating. The motorized shutter may be controlled, for example, by a thermostat and/or other automatic control or even a manual control. Various modifications are possible.

Exhaust from the cylinders of the engine 200 may exit the apparatus 100 with an exhaust pipe having an outlet that is higher than the top of the tracks 102. The outlet of the exhaust pipe may be located elsewhere, depending on the embodiment. For example, the outlet may be located in a space with a rear transverse axle 172 and two rear rollers 170. This space is partially blocked by the tracks 102 surrounding the housing 104 of the apparatus 100. This configuration reduces noise and can prevent possible contact of the skin or clothing of the operator 110 with the hot outlet of the exhaust pipe. Check valves may also be used to prevent water from entering the engine 200 when the engine 200 is not running. Other configurations and arrangements may also be provided.

Fig. 8 is an isometric view showing another example of a compact pulling apparatus 100 based on the proposed concept. In this example, the motor/generator 202 may be used in an electric motor mode only, as there is no engine powered using fuel. There may be more batteries 206 because there is no engine. The battery 206 is charged using an external power source.

In use, air may circulate in an air path loop around the battery 206, for example, forward into the space along the left side of the battery, then from left to right in the space in front of the front interior chamber 152, then back into the space along the right side of the battery 206, and then out of the housing 104. The spaces at the left and right sides of the battery 206 may be spaced apart from each other with longitudinally arranged foam elements or the like provided along the top side and, if desired, along the bottom side of the battery 206. Other configurations and arrangements are possible. A circumferential air circuit within front inner chamber 152 may maintain battery 206 at an optimal temperature during cold weather conditions.

In the arrangement shown in fig. 8, air exits through a pair of air outlet slots 314 at the distal end of the handle 106. Thus, air enters from one hollow tube 312 and exits through the other hollow tube 312. The hollow tube 312 is closed at its top end to prevent the air inlet slot 310 and the air outlet slot 314 from communicating with each other inside the handle 106. The last segment of the ventilation circuit includes an air duct 340 that can feed air directly into the other hollow tube 312 without mixing with the incoming air. Air is allowed to exit the front interior chamber 152 through holes 326 through the rear interior wall 150. Various modifications are possible.

It should be noted that the configuration of the ventilation circuit shown in fig. 8 may be implemented in the embodiments of fig. 1 to 7, and vice versa. With the arrangement of fig. 8, the housing 104 can have a very waterproof construction up to the level of the air entry slots 310 and the air exit slots 314 on the handle 106. The apparatus 100 may then be submerged in water from time to time as may be required if the apparatus 100 must traverse an unfrozen stream or similar body of water.

The arrangement shown in fig. 8 may be modified, for example, to provide fewer batteries 206 and/or a larger housing 104 to provide cargo space inside the housing 104. The cargo space may extend between the inner wall 156 and the front wall of the housing 104. The cargo space may be used to carry devices such as self-powered generators, self-powered water pumps, and the like. These devices may be designed to operate outside of the apparatus 100 after removal from the cargo space, or integrated into the interior of the apparatus 100. This last feature is desirable in order to avoid handling the device. If desired, the device 100 may be designed with an integrated self-powered generator having an electrical output linked to a battery within the housing 104 for charging thereof. An air circuit may also be included that allows heat from the running generator to be directed toward the battery 206, thereby keeping the battery warm in cold weather conditions. The air circuit may include, for example, motorized shutters or the like, such as motorized shutters linked to thermostats and servo motors, to selectively open and close the air circuit. Various modifications are possible.

If desired, in all embodiments, a heating element, such as a heating wire, may be provided inside the housing 104 to keep the battery warm while the battery 206 is being charged or while cold weather equipment is stored outdoors. The heating element may be powered by an external power source, such as a household power source or the like.

In all embodiments, the proximal end of the handle 106 may be attached anywhere else to the device 100, other than as shown. For example, the handle 106 may be configured and constructed so that the device 100 may be easily used in any orientation. The left and right sides of the proximal end of handle 106 may be connected to lateral wall 140 at the center of device 100, although other configurations are possible. This feature is advantageous in changing the direction of movement of the device 100 so that the device 100 can be turned 180 degrees simply by pivoting the handle 106 from one end of the housing 104 to the other without pivoting the housing 104. For example, if the apparatus 100 is on a dead road, the operator 110 may simply move the armrest 108 on the other side, and then the apparatus 100 may move rearward with the operator 110 standing behind. Fully reversible devices may not have a front end or a back end because they may be interchangeable.

It is useful in some embodiments to provide attachments for scrapers (plow blades) on the housing 104, for example mounted at the front of the apparatus 100. The scrapers may be used, for example, to pull or push snow and/or ice. Scrapers may also be used with other materials such as sand, soil, mud, etc. The screed may include a lifting system for moving the screed into and out of engagement with the ground. A bucket or fork may also be provided with a corresponding load attachment for attachment to the housing 104. Various modifications are possible.

The specification and drawings are by way of example only. Those skilled in the art will appreciate that various modifications may be made while still falling within the framework of the proposed concept.

List of reference numerals

100 device

102 track

104 outer casing

105 longitudinal axis

106 handle

108 armrest

110 operator

112 skis

120 sled

122 hanging parts

124 support (transverse strut)

126 side plate

128 front plate

130 fastening element

132 hinged lid

140 lateral wall

142 top wall

144 bottom wall

146 front wall

148 rear wall

150 rear inner wall

152 front inner chamber

154 rear inner chamber

156 front inner wall

160 top sliding rail

162 front roller

164 front transverse axle

166 front side plate

168 front bumper

170 rear roller

172 rear transverse axle

174 rear side plate

176 brake disc

178 bearing

180 bearing

200 gasoline engine

202 electric generator/motor

204 external fuel tank

206 cell

270 longitudinally disposed main drive shaft

272 clutch

274 longitudinally disposed rear portion of the drive shaft

276 clutch

302 gearbox

304 front section (Generator/Motor)

306 control panel

310 air inlet slot

312 hollow tube

314 air outlet slot

320 front air inlet (Engine)

322 air duct

324 shield

326 hole (rear inner wall)

330 air outlet slot

340 air duct

Claims

1. A compact pulling apparatus (100) comprising:

an elongate waterproof housing (104) extending along a longitudinal axis (105), the housing (104) having a plurality of outer walls;

a track (102) disposed about the housing (104) along the longitudinal axis (105) and configured to move the compact pulling apparatus (100) when the track (102) is driven to rotate about the housing (104);

at least one track-driving motor (200, 202) for generating rotational output power for moving the track (102), the at least one track-driving motor (200, 202) being longitudinally disposed within the housing (104);

a front transverse axle and a rear transverse axle, the front transverse axle being taller than the rear transverse axle; and

a power transmission assembly supported by the housing (104) and establishing torque transmitting engagement between the at least one track-driving motor (200, 202) and the track (102), the power transmission assembly comprising:

-a longitudinally arranged main drive shaft (270) positioned at least partially within the housing (104);

-a transverse drive axle (164, 172) being either a front or a rear transverse axle; and

-a gearbox (302) having an input and an output, said input being drivingly connected to said longitudinally arranged main drive shaft (270) and said output being drivingly connected to said transverse drive axle (164, 172);

wherein the rotational output power is transmitted from an interior of the enclosure (104) to an exterior of the enclosure (104) through the power transmission assembly using at least one rotatable shaft section that sealingly extends through a corresponding one of the plurality of outer walls of the enclosure (104).

2. The compact pulling apparatus (100) as defined in claim 1, wherein the gearbox (302) includes an internal speed reduction gear mechanism interposed between the input and the output of the gearbox (302).

3. The compact pulling apparatus (100) as defined in claim 2, wherein the internal speed reduction gear mechanism of the gearbox (302) is self-locking.

4. The compact pulling apparatus (100) as defined in claim 1, wherein the gearbox (302) and the transverse drive axle (164, 172) are located outside of the housing (104).

5. The compact pulling apparatus (100) as defined in claim 4, wherein the transverse drive axle (164, 172) extends beyond the output of the gearbox (302).

6. The compact pulling apparatus (100) as defined in claim 5, wherein the gearbox (302) is located substantially centrally along the transverse drive axle (164, 172).

7. The compact pulling apparatus (100) as defined in claim 4, wherein the at least one rotatable shaft segment that sealingly extends through a respective one of the plurality of outer walls of the housing (104) is a portion (274) of the longitudinally arranged main drive shaft (270).

8. The compact pulling apparatus (100) as defined in claim 7, wherein the portion (274) of the longitudinally-arranged main drive shaft (270) extends through a rear wall (148) of the housing (104) and is sealingly connected to the rear wall (148) by a sealed bearing (180) or a rotatable seal, the output of the gearbox (302) being drivingly connected to a transverse drive axle (172) at a rear end of the compact pulling apparatus (100).

9. The compact pulling apparatus (100) as defined in claim 8, wherein the transverse drive axle (172) at the rear end is drivingly connected to the track (102) in torque-transmitting engagement with at least one roller (170) coaxially mounted on and fixedly coupled to the transverse drive axle (172) at the rear end, the at least one roller (170) engaging an inboard side of the track (102).

10. The compact pulling apparatus (100) as defined in claim 1, wherein an output of the gearbox (302) is drivingly connected to the transverse drive axle (164) at a front end of the compact pulling apparatus (100).

11. The compact pulling apparatus (100) as defined in claim 1, further comprising an outer cradle attached to the housing (104) and positioned above the tracks (102).

12. The compact pulling apparatus (100) as defined in claim 11, wherein the external cradle includes a storage space for a payload.

13. The compact pulling apparatus (100) as defined in claim 11, wherein the external cradle includes an external battery and electrical wiring extending between the external battery and an interior of the housing (104).

14. The compact pulling apparatus (100) as defined in claim 11, wherein the external cradle includes an external fuel storage tank and a fuel line extending between the external fuel storage tank and an interior of the housing (104) and providing fluid communication between the external fuel storage tank and the interior of the housing (104).

15. The compact pulling apparatus (100) as defined in any one of claims 1 to 14, further including a handle (106) having a distal end and a proximal end, the proximal end being attached to the housing (104).

16. The compact pulling apparatus (100) as defined in claim 15, wherein the proximal end of the handle (106) has left and right sides that are pivotally attached to corresponding left and right sides of the housing (104).

17. The compact pulling apparatus (100) as defined in claim 16, wherein the handle (106) includes at least one hollow tube (312) providing at least one air circuit extending between an interior of the housing (104) and an air opening located on the handle (106), the at least one air circuit passing through a pivotal attachment of the handle (106) to at least one of the left and right sides of the housing (104).

18. The compact pulling apparatus (100) as defined in claim 17, wherein the handle (106) includes means for resisting a distal end of the handle (106) from falling onto the ground.

19. The compact pulling apparatus (100) as defined in claim 16, wherein a distal end of the handle (106) is positionable at either end of the housing (104) such that the compact pulling apparatus (100) is operable in a corresponding direction when the distal end of the handle (106) is pivoted to either end of the housing (104).

20. The compact pulling apparatus (100) as defined in claim 19, wherein a distal end of the handle (106) is pivotally connected at substantially a center of the housing (104).

21. The compact pulling apparatus (100) as defined in claim 15, wherein the handle (106) includes wires extending internally between the proximal and distal ends of the handle (106) to protect the wires from wear and damage.

22. The compact pulling apparatus (100) as defined in any one of claims 1 to 14, further including at least one snorkel extending laterally and upwardly from the housing (104) to draw fresh air into the housing (104) from a location above the tracks (102).

23. The compact pulling apparatus (100) as defined in any one of claims 1 to 14, further including a towed unit operatively connected behind the housing (104), the towed unit including ground-engaging tires and an upper platform disposed above the ground-engaging tires to receive a standing operator.

24. The compact pulling apparatus (100) as defined in any one of claims 1 to 14, wherein the housing (104) includes a cargo space within the housing (104).

25. The compact pulling apparatus (100) as defined in claim 24, wherein the cargo space holds self-powered devices.

26. The compact pulling apparatus (100) as defined in claim 25, wherein the self-powered device is integrated within the compact pulling apparatus (100) and operable from within the cargo space.

27. The compact pulling apparatus (100) as defined in claim 25, wherein the self-powered devices are removable from the cargo space for operation.

28. The compact pulling apparatus (100) as defined in claim 25, wherein the self-powered device includes a self-powered generator that operates on fuel.

29. The compact pulling apparatus (100) as defined in claim 25, wherein the self-powered device includes a self-powered water pump that operates on fuel.

30. The compact pulling apparatus (100) as defined in claim 26, wherein the self-powered device includes a self-powered generator operating on fuel that includes an electrical output for charging a battery (206) within the compact pulling apparatus (100) when in operation.

31. The compact pulling apparatus (100) as defined in claim 30, wherein the compact pulling apparatus (100) includes an air circuit between the cargo space and other portions within the enclosure (104) for providing heat to the battery (206) when the self-powered generator is operating.

32. The compact pulling apparatus (100) as defined in any one of claims 1 to 14, further comprising a brake disc coaxially mounted on and fixedly attached to the main drive shaft (270).

33. The compact pulling apparatus (100) as defined in any one of claims 1 to 14, wherein the at least one track-driving motor includes an electric motor (202) coaxially mounted on the main drive shaft (270).

34. The compact pulling apparatus (100) as defined in claim 33, wherein the electric motor (202) receives power from a battery (206) within the housing (104).

35. The compact pulling apparatus (100) as defined in claim 34, further comprising an inverter unit that receives power from a battery (206) within the housing (104) to power one or more external devices.

36. The compact pulling apparatus (100) as defined in any one of claims 1 to 14, wherein the housing (104) includes an inner wall (150) that separates an interior of the housing (104) into a front interior chamber (152) and a rear interior chamber (154).

37. The compact pulling apparatus (100) as defined in claim 36, further comprising an internal ventilation circuit within the housing (104) that passes through at least one motorized shutter provided on the inner wall (150).

38. The compact pulling apparatus (100) as defined in claim 36, wherein the compact pulling apparatus (100) includes means for pressurizing a front interior chamber (152) of the housing (104) with a positive pressure.

39. The compact pulling apparatus (100) as defined in claim 33, wherein the compact pulling apparatus (100) includes only an electric motor (202) to generate rotational output power for driving the track (102).

40. The compact pulling apparatus (100) as defined in claim 36, wherein the at least one track-driving motor further includes an internal combustion engine (200) including a crankshaft rotational axis oriented generally parallel to the longitudinal axis (105), the engine (200) having an output drivingly connected to the end of the main drive shaft (270), the engine (200) including an integrated shroud (324) and an internal ventilator having an inlet in fluid communication with the rear interior chamber (154) through a corresponding air duct (322).

41. The compact pulling apparatus (100) as defined in claim 33, wherein the at least one track-driving motor includes an internal combustion engine (200) in addition to the electric motor (202), the internal combustion engine (200) having a crankshaft axis of rotation oriented generally parallel to the longitudinal axis (105), the engine (200) having an output drivingly connected to an end of the main drive shaft (270).

42. The compact pulling apparatus (100) as defined in claim 41, further comprising a first clutch (272) that allows coupling or decoupling of two portions of the main drive shaft (270) between the electric motor (202) and the gearbox (302).

43. The compact pulling apparatus (100) as defined in claim 42, wherein the electric motor (202) includes at least one of a starter mode that provides rotational output power to drive a crankshaft of the engine (200) to rotate to start the engine (200) and a power generator mode that generates electrical power from the rotational output power received from the engine (200).

44. The compact pulling apparatus (100) as defined in claim 43, further including a second clutch (276) disposed between the engine (200) and the main drive shaft (270).

45. The compact pulling apparatus (100) as defined in claim 44, wherein a second clutch (276) of the compact pulling apparatus (100) allows disengagement of the engine (200) from the main drive shaft (270) to support the compact pulling apparatus (100) only in an electric motor mode.

46. The compact pulling apparatus (100) as defined in claim 41, wherein the track (102) is simultaneously drivable by the engine (200) and the electric motor (202), both of which generate some rotational output power to move the track (102) in the event of a steep grade or a towing load.

47. The compact traction device (100) of claim 41, wherein the electric motor (202) has a power generator mode that is actuatable to generate a braking force when the compact traction device (100) is in motion, and charges a battery (206) within the housing (104) with torque from the braking force.

48. The compact pulling apparatus (100) as defined in claim 41, wherein the electric motor (202) has a power generator mode that is actuatable to generate electricity when the compact pulling apparatus (100) is in motion.

49. The compact pulling apparatus (100) as defined in any one of claims 1 to 14, wherein the at least one track-driving motor includes only an internal combustion engine (200) having a crankshaft axis of rotation oriented substantially parallel to the longitudinal axis (105).

50. The compact pulling apparatus (100) as defined in claim 49, wherein the compact pulling apparatus (100) includes an engine control device that reverses rotation of the engine (200) and drives the compact pulling apparatus (100) in the opposite direction.

51. The compact pulling apparatus (100) as defined in any one of claims 1 to 14, wherein the housing (104) includes at least one side panel pivotally connected with an upper hinge to a corresponding wall (140) on the housing (104), the side panel providing a rain-shielding function when opened.

52. The compact pulling apparatus (100) as defined in any one of claims 1 to 14, wherein the housing (104) further includes a skid rail (160) provided with one or more pairs of rollers and/or wheels operatively connected to the housing (104) and adapted to engage an inner face of the track (102) so as to reduce friction between the inner face of the track (102) and an outer side of the housing (104).

53. The compact pulling apparatus (100) as defined in any one of claims 1 to 14, wherein the compact pulling apparatus (100) includes at least one of a search and rescue device and/or a search and rescue offering on the compact pulling apparatus (100).

54. The compact pulling apparatus (100) as defined in any one of claims 1 to 14, wherein the compact pulling apparatus (100) includes at least one of: a blade, a bucket, and a fork attached to the housing (104).

55. The compact pulling apparatus (100) as defined in any one of claims 1 to 14, wherein the main drive shaft (270) includes two coaxially arranged shaft sections.

56. The compact pulling apparatus (100) as defined in claim 12, wherein the payload includes luggage and equipment.

57. The compact pulling apparatus (100) as defined in claim 42, wherein the first clutch (272) is a centrifugal clutch or an electrically operated clutch.

58. The compact pulling apparatus (100) as defined in claim 44, wherein the second clutch (276) is a centrifugal clutch, an electrically operated clutch, or a one-way clutch.