The flow limiter for hydrostatic transmissions

 

(57) Abstract:

Used in the hydraulic circuits for vehicles and can be used in road-building machinery. The inventive flow limiter for hydrostatic transmission includes a housing 1 with an inlet 2 and outlet 4, the plunger 6, the spring 8 and the control mechanism. In case 1 limiter between input 2 and output 3 is made of an additional valve 14 connected to the output 4. Side entry 2 before the plunger 6 has more spring 11. The control mechanism made in the form prescribed in section 1 of the adjusting bolt 9, based on the main spring 8. 2 Il.

The invention relates to a hydraulic drive for vehicles and can be used in road construction machinery.

Known hydrostatic transmission vehicle containing hydraulic motor - wheel spools turn off motors, connected by means of hose through the reversing valve to the hydraulic pump, safety and control hydraulics and stops flow.with. 901083, class B 60 K 17/00, 1980).

A disadvantage of the known transmission is to drain the transmission all required in the work vehicle towing speed ranges.

The closest in technical essence is the flow limiter containing composition hydrostatic transmissions flow installed in their buildings plunger with spring, as well as additional springs on the input side of each of the flow limiter between the housing and the plunger [1].

The disadvantage used in the transmission of the flow restrictors is the complexity of the design.

The purpose of the invention is the extension of functionality by simplifying the structure.

This objective is achieved in that in the flow limiter for a hydrostatic transmission, comprising a housing with output and an output, a plunger, a spring and a control mechanism, in the case of the limiter between input and output channel connected to the output, with the input side before the plunger has more spring and a control mechanism made in the form prescribed in the housing of the adjusting bolt resting on the main spring.

It is known that addition of an adjustable pump, hydraulic motors, valves and auxiliary equipment, any hydrostatic transmission construction and road machines contains, as a rule, a number of special the creation of a multi-way valves for different purposes.with. 146696, class B 60 K 17/10).

In General these devices hydrostatic transmissions allow for different needs traction and speed of the vehicle. In particular, the flow is allowed to have profiles with locked differential communication wheeled or tracked propulsion of the vehicle, as mentioned products for off dividers provide a mode of motion with differential relationship between the propellers. And because the dominant operational requirements for road-building machines are saving the maximum possible traction qualities in her work modes, so the developers of such machines should effectively solve the problem of eliminating or limiting the extent necessary slipping propulsion. The solution to this problem is simplified in the case of use of hydrostatic transmissions of the proposed flow limiter, for example, in number according to the number of wheel movers. The proposed flow limiter allows you to achieve a technical result, similar to the case of use in the transmission of special devices, with simple technical means, so as itself to restrict flow enough design is to ensure and to switch between the following modes:

1. the restriction of the flow from input to output;

2. freely, without resistance flow from input to output and Vice versa;

3. freely, but with a certain resistance to the flow from the exit to the exit;

4. overlapping flow from input and output, and Vice versa (gate mode);

5. regulation of the size limits of the stream.

In addition, hydrostatic transmission, some machines on the basis of flow limiters will allow you to work with relatively low energy consumption in operation.

Achieved all these modes by a set of shared listed in the claims of different signs.

Thus, being applied on the vehicle, the proposed flow limiter (in contrast to the known manufactured in various industries over-consumption) will provide nearly all required operation of the traction-speed modes without expanding the range and number of components in hydrostatic transmissions.

In Fig. 1 shows a structural diagram of the proposed flow limiter of Fig. 2 is a variant of the schematic circuit hydrostatic transmissions on bashada 4 with the adjusting hole 5, the plunger 6 with an opening 7, the spring 8, the set screw 9 with the guide sleeve 10, and an additional spring 11, the separator fingers 12 and the seal of the bolt 13. In addition, the housing 1 has an additional output 14, combined with output 4 channel 15. Opposite the entrance, the housing 1 is closed easily removable cover 16.

In Fig. 2 skompanovan option scheme of the transmission using the proposed limiter to illustrate the operational and technological capabilities. In this case, the hydrostatic transmission includes an adjustable pump 17 mandatory for any hydrostatic transmission unit charging-protective equipment 18, the motors 19 to 22 and the flow restrictors 23-26 key 27 setting modes. The motors are connected by a clutch 28-31 with the epicyclic reduction gear (not shown).

The principle of the flow limiter is that it by automatically regulating the pressure loss at the orifice flow metering orifice 7 provides a constant flow rate regardless of fluctuations in the pressure difference at the inlet and outlet hose. Fluid from the pump 17 is supplied to the input 2 of the limiter and then the hole 7 movably in the ditch 19-22. The plunger 6 is loaded by a spring 8, a force which is balanced by the pressure drop created by the resistance of the holes 7 and weaker additional spring 11. If the fluid flow increases, it will increase the pressure drop, as a result, the plunger 6 moves to the right and partially block the hole 5, reducing consumption. The limiter provides almost stable set mounting bolt 9 flow regardless of the pressure at the outlet 4 with an error, usually not exceeding 1%.

In relation to vehicles of the type of construction and road machinery, it is advisable from the point of view of minimization of energy consumption, prolong pump, hydraulic motors and to avoid a sharp drop in thrust, to have always a differential connection between the motors and only with the falling of the thrust in the case of excessive towing (over 30%) of any wheel to enter limited-differential relationship that almost makes properly designed and adjusted the flow limiter.

For most machines at work on the ground without compromising traction and dynamic qualities of the coefficient of slippage of the wheels is in the range of 20-30%, which should be the basis for calculation of flux limiters is nicities flow and hydrostatic transmissions will consider characteristic modes it asked mounting bolt 9. The setting of each mode is regulation size H otstoyniy end T of the bolt to the plane of the OO side of the housing 1 (Fig. 1).

In shown in Fig. 1 position when the end face T of the installation bolt 9 ottoni OO distance Habout-Htothe flow limiter will work in native mode classic flow limiter, with each newly established force of the compression spring 8 (within size Habout-Htocorresponds to a certain limit fluid flow Obefore.

Thus, setting (adjustment using the key settings 27) the location of the end face T of the installation bolt 9 in the size range of Haboutto Htoyou can get smaller or larger values of the marginal costs Obefore. This will allow you to have a higher traction and dynamic quality machines at different speeds of movement in the operating mode, i.e. with different values of the performance of the pump 17. When the values of flow through the flow limiter from zero to Obeforein the circuit hydrostatic transmissions is stored differential relationship between the inputs of all ogranichitel the limiter flow also allows you to perform another function movement of the machine in reverse. This is due to the passing of the fluid flow through the restrictor from output 4 to input 2 through the opening 7.

Another mode, movement of the machine at the transport speed will be obtained if the location of the installation bolt 9 size Hin. Thus, the spring 8 will be in the position close to almost free (uncompressed) state, and balanced by the additional spring 11, and the hole 5 and 14 will be blocked by the body of the plunger 6 and is not hydraulically connected to the outlet 2. This setting will correspond to the locked position output 4, i.e., the flow limiter will perform the function of a valve. Sequential removing of wheel propulsion couplings 31, 30 and 29 of hydraulic motors and deactivation of flow restrictors 26, 25 and 24 can be in several times to increase the speed of movement of the machine in transport modes, receiving 1st, 2nd and 3rd transport speed of movement.

Free mode without additional hydraulic resistance to fluid flow will be obtained when installing the bolt 9 for measurement of Hd. This spring 8 and 11 will be free (not pressed), the hole 5 is blocked shifted to the right, the plunger 6 and the input 32 is nepredskazuemogo of the flow limiter the most economical operation.

Moreover, there are many ways to achieve rational transport speed ranges of movement of the machine, for example, for a transmission according to Fig. 2 configuration of flow restrictors 23 and 24 to the rear wheels) on free mode, without additional hydraulic resistance to fluid flow, and the flow restrictors 25 and 26 off (valve effect) disconnect couplings 30 and 31 of the hydraulic motors 21 and 22.

The flow limiter for a hydrostatic transmission, comprising a housing with inlet and outlet, a spring-loaded plunger on the part of the control mechanism of the main spring and on the other hand, from the entrance, based on case - additional spring, characterized in that in the case of the limiter between input and output performed additional channel communicated with the output, and a control mechanism made in the form prescribed in the housing of the adjusting bolt, propping up the main spring.

 

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