RU238307U1 - Motorsnowboard - Google Patents

Abstract

The utility model relates to tracked vehicles, namely, a snowmobile. The snowmobile comprises a supporting frame to which all component parts of the structure are secured, a frame with a skid suspension to which sprockets connected by a track are secured, with eccentric shafts for adjusting the track tension, a shaft with a thrust roller, an engine with attachments, a handlebar, a protective housing made of HDPE (low-density polyethylene) of the supporting frame, a fuel tank, the leading and driven pulleys of a variator, a single-stage gearbox and a drive sprocket made of HDPE, and an engine hood made of HDPE. The technical result consists in increasing the safety of use, reliability and controllability, and increasing the service life of the snowmobile. 3 clauses, 5 figs.

Description

The utility model relates to tracked vehicles, specifically a motorized snowboard. A motorized snowboard is known from the prior art [see CA 2835768 A1 published 04.06.2015].

A motorized snowboard is known from the prior art [see US 2009255745 A1, published 2009-10-15]. The motorized snowboard comprises: a board having a top surface, a bottom surface, a width, a front portion, a back portion, edges and an open channel in the back portion between opposite edges, wherein the open channel has a width less than that of the board; a track body attached to the board and having opposite sides overlapping a portion of the open channel; a track assembly comprising: a continuous track, an upper roller assembly having a leading roller and a trailing roller, each of which is attached between opposite sides of the track body, a lower roller assembly having a floating frame with opposite sides and a leading roller and a trailing roller, each of which is attached between opposite sides of the floating frame, wherein the floating frame is pivotally attached to the track body, and a biasing mechanism for moving the floating frame downwards; and a motor operatively connected to the track assembly to drive the continuous path.

The disadvantage of the alternative is that the frame of the product only allows movement on level surfaces. If the snowboard gets caught between two uneven surfaces or hits a high obstacle, the track loses contact with the surface.

The closest analogue of the claimed device is a motorized snowboard [see US 2009255745 A1, published 15.10.2009].

A motorized snowboard comprises: a chassis including a rider support platform designed to support the rider's legs and extending through the longitudinal plane of the motorized snowboard, an engine supported by the chassis in a forward position, an endless track arranged so that it contacts the ground, wherein the endless track is connected to the chassis and is driven by the engine to move the motorized snowboard along the ground, and an engine control element located behind the longitudinal midpoint of the motorized snowboard and configured to control the engine.

The closest alternative has the following disadvantages: the front-mounted engine compromises the balance of the snowboard's weight, significantly reducing its maneuverability. While riding, it's impossible to lift the front of the snowboard to overcome tall obstacles or make turns.

The variator does not have additional cooling.

During prolonged and intensive use of the snowboard, fuel in the tank could spill out due to a leaky cap. The fuel tank's location close to hot engine components—the combustion chamber and exhaust pipe—caused gasoline to ignite upon contact. Because all attachments were mounted on the engine itself, the height of the snowboard made it difficult for shorter riders to comfortably use the board, as their feet would rest against the engine shroud. This reduced rider mobility and made the snowboard difficult to control.

The exhaust system was designed to direct gases upwards, away from the engine, and thus directly onto the rider.

Known and accepted as prototypes are a tracked snowboard [RU Patent No. 223995, IPC B62D 55/07 (2006/01) B62M 27/02 (2006/01) A63C 5/00 (2006/01), 2024] and a snowboard [RU Patent No. 224766, IPC B62D 55/07 (2006/01), 2024]

A snowboard consists of a main frame, which supports all components, a frame with skids, which supports the drive and driven shafts with rollers connected by a track, a chain drive with tensioner, a variator, a gasoline engine with attachments, a handlebar, a plastic main frame cover, a fuel tank, and an exhaust system. The variator's drive link is equipped with an additional air cooling system; the cooling unit consists of the outer variator housing with an impeller, manufactured in one piece. The fuel tank is mounted on the handlebar, and the exhaust system is routed to the side. The engine is equipped with a low-profile air filter housing, mounted in front of the throttle body, to filter the air entering the engine.

The design flaws of these prototype snowboards include the use of a chain drive with tensioners to transmit torque from the engine to the track. The chain is prone to stretching and jamming if it breaks, leading to abrupt stops and rider falls. The tensioners are prone to significant wear. The chain drive is located on the side of the snowboard, increasing its size and complicating movement over rough terrain (if the chain drive hits an obstacle, the snowboard's track loses contact with the surface). Regular cleaning of snow and ice, chain lubrication, and tensioner adjustment are necessary.

When using a screw track tensioning system, precise installation of the driven track shaft is difficult, which results in uneven wear of the runners and drive elements containing bearings, and the track may come off the drive and driven shafts.

The engine is attached directly to the main frame and there is no vibration suppression system to reduce the vibration transmitted from the engine to the snowboard structure, footrests and handle.

The fuel tank is mounted high on the handlebars relative to the center of gravity, which impairs control.

The prototype uses metal footrests; when riding, ice accumulates on these footrests, requiring frequent stops and clearing of the ice from the snowboard.

In the prototype, the engine hood is attached to the body with screws, which does not allow for quick and easy removal and installation of the hood.

The prototype uses an eyebolt as a towing device; this solution leads to frequent breakage of the eyebolt, especially during lateral jerks.

The low gear ratio of the chain transmission does not allow driving uphill without overloading the engine and the CVT belt.

The claimed utility model is aimed at achieving a technical result in the form of increased reliability of a snowboard through the use of new components and assemblies.

The stated goals can be achieved by creating a snowboard comprising a supporting frame supporting an engine with attachments, drive and driven pulleys of a variator, a single-stage gearbox interlocked with a HDPE drive sprocket via a shaft, handlebars, a protective HDPE housing for the supporting frame, a frame with a skid suspension supporting the drive and driven sprockets connected by a track, and a shaft with a thrust roller. The fuel tank is mounted either on the handlebars or on the engine, depending on the type of engine installed on the utility model. The exhaust outlet direction is reversed.

The essence of the utility model is explained by drawings, which:

Fig. 1 - side view of a snowboard;

Fig. 2 - rear view of the snowboard;

Fig. 3 - view of a gearbox blocked with a star made of HDPE;

Fig. 4 - view of the plate with rubber shock absorbers for the engine;

Fig. 5 - view of the eccentric track tensioning system.

These drawings do not cover and, moreover, do not limit the entire scope of embodiments of the given technical solution, but represent only illustrative material of a particular case of its implementation. In accordance with the example of the embodiment of the utility model shown in Fig. 1, Fig. 2, the snowboard consists of: a supporting frame 1, an engine with attachments 2, a handlebar 3, a fuel tank 4, an exhaust system 5, an air filter 6, leading and driven pulleys of a variator 7, a single-stage gearbox 8, a drive sprocket 9, a track 10, a frame with a skid suspension for the track 11, a shaft with a thrust roller 12, an adapter plate with rubber shock absorbers 13, an eccentric track tensioning system 14, an engine hood 15, a protective housing made of HDPE for the supporting frame 16.

The supporting frame is the element of the snowboard to which all the components of the structure are attached.

The engine is the main driving device of a snowboard.

The handlebars are essential for controlling the snowboard. They house the engine controls and lighting.

The fuel tank is used to store fuel.

Exhaust system - serves to remove exhaust gases.

The air filter serves to filter the air entering the engine to form a fuel-air mixture.

In the proposed design of a snowboard, the frame with a skid suspension has stars at the front and rear, equipped with an eccentric system for adjusting the shaft tension.

In the proposed design of the snowboard, the protective casing for the supporting frame is made of HDPE, open at the front and back where the track is installed.

The proposed snowboard design replaces a chain drive with tensioners with a single-stage gearbox (Fig. 3) coupled with a HDPE sprocket, which drives the track through an additional row of holes. This design improves performance:

- no driving and driven shafts,

- increased cross-country ability, since there are no protruding parts of the drive beyond the dimensions of the track,

- thanks to the compactness of the drive, we were able to enlarge and make the rear footrest more comfortable,

- nothing prevents snow from exiting the track suspension,

- there are no bearings fastening the shafts to the supporting body,

- there is no chain transmission with tensioners,

- there are no chain sprockets,

- this made it possible to place an eccentric track tensioning system in the front and rear parts of the frame for skid suspension.

This increases the snowboard's lifespan and ease of repair. It also reduces its size, making it more maneuverable.

The screw track tensioning system (prototypes 223995, 224766) has been changed to an eccentric track tensioning system (Fig. 5), which consists of simultaneously moving the left and right stars, located in the front and rear parts of the supporting frame, by the same pre-set distance, which eliminates skewing and leads to uniform track tension.

In the proposed utility model, the engine is mounted on an adapter plate with rubber shock absorbers (Fig. 4), which allows for a significant reduction in the level of vibration transmitted to the structure of the snowboard, footrest and handle.

The fuel tank is mounted on the handlebars in an optimal position relative to the center of gravity, which improves the stability of the snowboard.

Instead of metal footrests (prototypes 223995, 224766), special platforms with holes are used, molded integrally with the HDPE body for the supporting frame. The special shape and the absence of metal prevent snow from sticking. Cleaning during operation is not required.

The engine hood is secured with latches and can be removed and installed without tools.

Instead of a towing eyebolt, a welded loop is used, which eliminates the possibility of breakage, even with a lateral jerk.

The high gear ratio of the gearbox allows you to easily pull the sled and go uphill without overloading the engine and variator belt.

The exhaust direction has been changed - it is directed to the side and does not hit the rider.

A distinctive feature of the snowboard body is its aerodynamic design, which prevents snow from being thrown onto the rider.

Claims (4)

1. A snowboard comprising a supporting frame on which an engine with attachments, leading and driven pulleys of a variator are mounted, characterized in that a single-stage gearbox, interlocked with a drive sprocket made of HDPE, a steering wheel, a protective housing made of HDPE for the supporting frame, a frame with a skid suspension on which leading and driven sprockets connected by a track are mounted, a shaft with a thrust roller, is used to transmit torque from the engine to the track instead of a chain drive. 2. A motorized snowboard according to paragraph 1, characterized in that the front and rear shafts are equipped with an eccentric track tension adjustment system. 3. A motorized snowboard according to paragraph 1, characterized in that the engine is mounted on rubber shock absorbers to reduce the level of vibration transmitted to the structure of the motorized snowboard. 4. A motorized snowboard according to paragraph 1, characterized in that the engine hood is secured with latches for quick access to the engine compartment.