RU2464198C1 - Electrically driven track tensioner - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: invention relates to caterpillar vehicles including combat vehicle. Proposed tensioner incorporates planetary gearbox with no pinion carrier with tensioner crank fitted in reduction gearbox central opening. Crank lock is furnished with throw-out indicator. Tensioner indicator is made up of compact resistor coil with moving contact and tensioning electric indicator. Manual backup adjustment pin is arranged outside the vehicle board. Caterpillar track tensioning if performed to signal from driver control board.

EFFECT: compact design, ease of use.

3 cl, 3 dwg

Description

The invention relates to the field of transport engineering and can be used in the construction of transport tracked vehicles, including military ones.

The known design of the mechanism of the tension of the tracks BMP-1 [BMP-1 infantry fighting vehicle. Technical description, Moscow. Military Publishing House of the Ministry of Defense of the USSR, 1972, p. 226]. This track tension mechanism (MNG) is made in the form of a worm gear with a crank lock clutch with a tension wheel with a manual drive for adjusting the track tension. The advantages of the BMP-1 MNG are its simplicity of design and reliable operation. The disadvantages of MNGs are the relatively high complexity and duration of manual adjustment of the track tension, which creates difficulties in the operation of machines, especially military ones.

In mechanical drives of various machines, in addition to worm gears, other types of mechanical gears are also used. In particular, a non-drive planetary gear [WO 92/05372, F16H 1/28, 1/46 (or EP 91/01825)] is known, comprising three central gears and satellites interacting with them. One of the central wheels is driving, the other is driven, and the third is supporting, that is, connected to the transmission housing. The driven and supporting wheels are made with external teeth, and the driven wheel is located between the two rims of the supporting wheel. The gear teeth of the satellites, designed to interact with the driven and support wheels, generally have a different number of teeth. The driving central wheel has internal teeth which are meshed with the central crowns of the satellites, as well as external teeth interacting with the timing belt. By itself, this drive design does not provide the functions of the MNG.

On some vehicles of domestic and foreign production [BMD-1 landing vehicle. Technical description, Moscow. Military publishing house of the Ministry of Defense of the USSR, 1973, p. 273] used hydraulic MNG. A design feature of this MNG is the presence in its composition of an executive hydraulic cylinder located inside the machine body and connected to the crank of the tension wheel by a lever device. The operation of the hydraulic cylinder is controlled by a hydraulic actuator, including a high pressure pump, pipeline and control valves and sensors to ensure the functioning of the hydraulic tension system. The disadvantage of hydraulic MNG is the relative complexity of the design and reduced reliability associated with the limited resource seals of high-pressure hydraulics. Another disadvantage of the hydraulic MNG is the use of the net volume inside the machine body to accommodate the MNG with drive elements.

The closest to the proposed (prototype) design of the mechanism of the tension of the tracks with an electric drive armored repair and recovery vehicle BREM-L [Armored repair and recovery vehicle BREM-L. Technical description of ER 691-sb1 TO, Kurgan, SKBM]. The BREM-L MNG is made in the form of an electric motor lowering a planetary-helical gearbox, a hydraulic tension indication sensor and a manual track tensioner. This design is devoid of the noted drawbacks of the BMG-1 MNG. It is reliable in operation. The ability to remotely control the tension of the tracks from the driver’s console allows you to reduce the complexity and reduce the time to perform work on adjusting the tension of the tracks.

The disadvantages of MNG BREM-L: its relatively large weight; the need to use the useful volume of the habitat zone inside the machine body to place the MNG; inconvenience of using the manual doubler of the MNG during adjustment work, due to the limited access to it inside the machine body.

To eliminate these drawbacks, the mechanism for tensioning the track with an electric drive, like the prototype, includes a drive motor, a reduction gear, a sensor for indicating the tension of the track, a manual tension backup, but in contrast to the prototype, it contains a planetless gear reducer, in the central hole of which there is a crank of the tension mechanism with a locking device crank equipped with a push element alarm off. The drive motor is mounted on the housing of the tension mechanism by means of a rotary hub with a spring, which is mounted on a fixed support of the mechanism housing. The adjusting axis of the manual override of the tension mechanism is located outside the machine.

The placement of the axis of the crank of the tension wheel with the locking device in the Central hole of the planetless gearless gearbox provides compactness and relatively low weight MNG. The design of the MNG housing makes it possible to partially place it in the outboard space, thereby freeing up usable space in the living area inside the machine body. Access from the side of the outer side to the MNG handwheel device increases the convenience of adjusting the track tension in manual mode.

The track tension indicator comprises a resistor coil integrated in the mechanism body and a movable contact connected to the rotary hub of the electric motor. This design of the sensor is compact, lightweight, provides ease of use in operation.

The invention is illustrated by drawings, where shown: in Fig.1 - device MNG; figure 2 - spring drive rotary hub of the electric motor;

figure 3 is a schematic diagram of a resistor sensor with a pointer for recording the tension force of the track.

In the housing 1 of the MNG there is a gearless planetary gearbox including an epicyclic wheel 2 connected to a pinion gear 3, the shaft of which is connected via a clutch 4 to the shaft of the electric motor 5. The floating satellites 6 form gears with the epicyclic wheel 2, with the support wheels 7 and 8 mounted motionless on the housing 1, as well as with the driven wheel 9, rigidly mounted on the axis of the crank 10 of the tension wheel (not shown) of the track. The number of teeth - the same for the support wheels 7 and 8, differs from the number of teeth of the driven wheel 9, for example, by one tooth, which allows you to obtain the necessary (sufficiently large) gear ratio of the gearbox with the same number of teeth of all the crowns of the satellites 6. Use of satellites with different numbers of teeth crowns, designed to interact with the support and driven wheels, provides an additional opportunity to increase the gear ratio of the gearbox. Due to the large number of satellites (10 ... 15) that are simultaneously involved in the transfer of load, such a transfer provides the necessary load capacity of the MNG. The rotary hub 11, on which the electric motor 5 is mounted, is fixed in the housing 1 by means of a ball lock 12. At the end of the hub 11 there is a support 13 with a spring 14, which is fixed with its free end to the support 15, which is fixedly mounted on the mechanism housing 1. The gear coupling half 16, movably mounted on the slots of the crank 10, under the action of the spring 17 engages with a coupling half 18 rigidly fixed to the housing 1. The pressing element 19 is rigidly fixed to the coupling half 16 and interacts with the pressure switch element of the limit switch 20, connected by electrical switching with the lock indicator 21 on the driver’s remote control. The manual backup 22 of the track tension is mounted on the cover 23 of the MNG. It is made in the form of a pinion shaft meshing with the outer gear ring of the epicyclic wheel 2. The MNG is fixed motionless in the bore of the bead 24 of the machine. The resistor coil 25 is fixedly mounted in the housing 1 and interacts with the movable contact 26 (Fig. 3) of the electric track tension indicator 27. The fitting 28 is connected to the compressed air supply path of the machine pneumatic system.

To perform the adjustment of the track tension by a signal from the remote control (not shown) of the driver, compressed air is supplied to the cavity “B” of the crank lock mechanism 10 of the MNG through the nozzle 28. The coupling half 16 moves under pressure from the air, compressing the spring 17. The pressure member 19 moves with the coupling half 16, while the movable contact of the limit switch 20 initiates a light signal on the driver’s remote control "Lock off." After that, the electric motor 5 is turned on. The movement through the clutch 4 is transmitted to the drive gear and then to the epicyclic wheel 2. Floating satellites 6, which are meshed with the wheel 2, are rolled along the supporting wheels 7, 8 and the wheel 9. while the crank 10 is freed from lock on the housing 1 MNG, rotates in the right direction. The control from the driver’s remote control by a reversible electric motor 5 provides the modes of tension or attenuation of the track. When the track is tensioned, the electric motor 5 rotates with the hub 11 in the housing 1 under the action of a reactive moment, while the spring 14, fixed between the fixed 15 and the movable (together with the hub 11) support 13, is deformed adequately to the moment of resistance on the axis of the tension wheel (not shown in the drawing ) The movable contact 26 rotates together with the hub 11 and slides along the resistor coil 25, which is fixedly mounted on the housing 1. The variable resistance in the electrical circuit of the pointer 27 on the driver’s console, matching with the moment of resistance on the axis of the tension wheel allows recording the track tension force on the index 27 scale, normalized in units of force. After the end of the track tension, the cavity “B” is connected to the atmosphere by an electro-pneumatic valve (not shown in the drawing) by the signal from the driver’s remote control. The coupling half 16, under the action of the compressed spring 17, engages with the coupling half 18, locking the crank 10 to the housing 1. the element 19 activates the movable contact of the limit switch 20 and on the driver’s remote control the indicator 21 indicates the MNG locking device is turned on. MNG interlocking and reversible given (relative to the tension mode) rotating the crank 10 until the operation completes.

The application of the proposed MNG with an electric drive allows, in comparison with the known structures, to reduce the weight and the useful volume occupied by the tensioning mechanism in the machine body. Free access to the manual backup of the track tension adjustment from the side of the outer side increases the ease of maintenance of the MNG in operation.

Claims (3)

1. The mechanism of the tension of the track with an electric drive, including a drive motor, a reduction gear, a sensor for indicating the tension of the track, a manual backup of the tension, characterized in that it contains a planetless gear reducer, in the central hole of which is placed the crank of the tension mechanism with the locking device of the crank equipped with a pressure signal element off, and the drive motor is mounted on the housing of the tension mechanism by means of a rotary hub with a spring that is fixed to movable support of the mechanism body. 2. The mechanism for tensioning the track with an electric drive according to claim 1, characterized in that the indicator of the tension of the track contains a resistor coil built into the mechanism body and a movable contact associated with the rotary hub of the electric motor. 3. The tension mechanism of the track with an electric drive according to claim 1 or 2, characterized in that the adjustment axis of the manual backup of the tension mechanism is located outside the machine.

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