CN2249187Y - Pneumatic shifting device of reducer casing - Google Patents

Abstract

The utility model pushes out a pneumatic shifting device of a reducer casing, which is jointed to form by a three-position five-way change valve, a quick exhaust valve and a three-position air cylinder through pipelines. The utility model replaces one multiposition multiway change valve in the existing pneumatic shifting device with the quick exhaust valve. The utility model has the advantages of simple structure, firm work and simplified operation. The cross-sectional area of a strengthening guide rod of an auxiliary piston in the three-position air cylinder is reduced. When the utility model is positioned at a middle gear, the stress of the auxiliary piston is larger than an execution piston. The pressure class of pressure air sources is saved. Therefore, external conditions are simplified. The utility model is conveniently suitable for the pneumatic gear change of the reducer casing. The utility model is suitable for gear change for the reducer casing of large-scale vehicles.

Description

The drop-gear box Pneumatic shifting device

The utility model belongs to a kind of engineering part, particularly a kind of Pneumatic shifting device that is used for drop-gear box.

In order to solve deficiency, the Pneumatic shifting device to drop-gear box has been arranged in the prior art to the gear shift of drop-gear box manpower.Wherein with the multidigit how circulating pathway of logical change-over valve control presssure source of the gas and the position of piston of selected multiposition cylinder, also just driven the shift fork with the piston associated, go to stir the change gear of the drop-gear box that will control and the purpose that reaches gear shift.And in the existing Pneumatic shifting device, needing the pressure gas source of two kinds of pressure, control three cylinder needs how logical change-over valve of two multidigits, will pull twice change-over valve in the gear shift and in proper order immutable, and middle speed might not hung or it is not firm to hang.

The purpose of this utility model is to provide a kind of simple in structure, drop-gear box Pneumatic shifting device firm, simplified control of working.

The utility model is realized as follows.

The utility model is by the 3 position-5 way scavenge valve that an admission port and C, D, three air extractor ducts that not only can communicate with admission port but also can communicate with atmosphere respectively of E are arranged, the quick exhaust valve that A, O, three gas ports of P are arranged, and be connected with pipeline and constitute at air chamber two ends and middle three cylinders that gas port arranged.Its connection structure is as follows, the admission port of 3 position-5 way valve is connected with external pressure gas source, the air extractor duct C of 3 position-5 way valve is connected with the middle gas port of three cylinders, the air extractor duct D of 3 position-5 way valve is connected with the gas port O of fast band blow off valve, the air extractor duct E of 3 position-5 way valve is connected with the auxiliary piston end gas port three of the gas port P of quick exhaust valve and three cylinders, and the gas port A of quick exhaust valve is connected with the execution piston end gas port of three cylinders.Auxiliary piston in aforementioned three cylinders is less than the sectional area of carrying out the piston rod on the piston near the sectional area of setting upright guide rod on the side of cylinder end face.

The utility model has following advantage.

The at high speed blow off valve replaces a change-over valve to realize three compressed-air shiftings of drop-gear box in the utility model, price is reduced, simple in structure, and only operate a change-over valve and just can carry out gear shift, simplified control and the mistaken problem of two change-over valve operation orders in the prior art can not occur.Owing to the sectional area of setting upright guide rod on the auxiliary piston in three cylinders reduces to make that the compression area of auxiliary piston becomes big, when at middle speed, the suffered atmospheric pressure of auxiliary piston is bigger, even make that under the effect with a kind of pneumatic supply of size, middle speed also can keep than stable status.

Description of drawings.

Fig. 1 is the overall pie graph of drop-gear box Pneumatic shifting device of the present utility model.

Fig. 2 is the schematic diagram that subtracts band case Pneumatic shifting device of the present utility model.

Below in conjunction with accompanying drawing in detail embodiment of the present utility model is described in detail.See figures.1.and.2.The utility model is the 3 position-5 way scavenge valve 1 that an admission port and C, D, three air extractor ducts that not only can communicate with admission port but also can communicate with atmosphere respectively of E are arranged, the quick exhaust valve 2 that A, O, three gas ports of P are arranged, and be connected with pipeline and constitute at air chamber two ends and middle three cylinders 3 that gas port arranged.Their connection structure is as follows, the admission port of 3 position-5 way valve 1 is connected with external pressure gas source, the air extractor duct C of switch valve with two-position and five-pass 1 is connected with the middle gas port of three cylinders 3, the air extractor duct D of 3 position-5 way valve 1 is connected with the gas port O of quick exhaust valve 2, the air extractor duct E of 3 position-5 way scavenge valve 1 is connected with the auxiliary piston 6 end gas port threes of the gas port P of quick exhaust valve 2 and three cylinders 3, and the gas port A of quick exhaust valve 2 is connected with the end gas port of the execution piston 8 of three cylinders 3.Auxiliary piston 6 in aforementioned three cylinders 3 is less than the sectional area of carrying out the piston rod 5 on the piston 8 near the sectional area of setting upright guide rod 10 on the side of cylinder end face.

The marque of 3 position-5 way valve 1 can be QF501C, and the marque of quick exhaust valve 2 can be QKP-L6.Three cylinders 3 are divided into two parts by the porose partition walls in centre, wherein a part is an air chamber, and air chamber is divided into two sections by locating piece 7, auxiliary piston 6 locating pieces 7 are installed in one section of close end auxiliary piston 6 is limited to slip in this section, an one side central authorities are equipped with and set upright guide rod 10, and opposite side has positive stop lug boss 9.Be equipped with in another section of air chamber and carry out piston 8, in the left side of carrying out piston 8 piston rod 5 is installed as shown in Figure 1, enter in another part and pass in the hole of piston rod 5 by aforementioned porose partition walls, on piston rod 5, be installed with shift fork 4 in order to stir the drop-gear box variable gear.The gas port of three cylinders 3 also shows on as shown in Figure 1 the position.

Working process of the present utility model is as follows, pressed gas is gone into the O mouth of quick exhaust valve 2 by the D mouth of 3 position-5 way valve 1, the P mouth is closed under pressure, communicate between the OA, pressed gas enters air chamber from the left hole of three cylinders 3, to carry out piston 8 pressed rightwards, and at this moment the original gas in the cylinder 3 is discharged to atmosphere through E, the C mouth of 3 position-5 way valve 1, at this moment shift fork 4 is at the right side gear.Enter the middle gas port of cylinder 3 by the C mouth of 3 position-5 way valve 1 when pressed gas, to carry out piston 8 and push the left side to, and auxiliary piston 6 is pushed the right side to, at this moment the gas in the cylinder 3 is via the A mouth of quick exhaust valve 2 and the D mouth exhaust to atmosphere of O mouth and 3 position-5 way valve 1, another road is through the E of change-over valve 1 mouth exhaust to atmosphere, and at this moment shift fork 4 is at the left side shelves.When pressed gas divides two-way to enter cylinder 3 by the E mouth of change-over valve 1, one tunnel right-hand member gas port through cylinder 3 enters cylinder 3, push auxiliary piston 6 to left side, the left end gas port that another kind of P mouth by quick exhaust valve 2 enters cylinder 3 through the A mouth will be carried out piston 8 and push the right side to, at this moment the positive stop lug boss 9 on the auxiliary piston 6 will be carried out piston 8 and be limited to a position intermediate, and at this moment shift fork 4 is at middle speed, and the gas in the former cylinder 3 drains into atmosphere via the C mouth of 3 position-5 way valve 1.

Claims (1)

1. drop-gear box Pneumatic shifting device, by an admission port and C are arranged, D, the 3 position-5 way scavenge valve 1 of three air extractor ducts that not only can communicate but also can communicate with atmosphere respectively of E with admission port, A is arranged, O, the quick exhaust valve 2 of three gas ports of P, and be connected with pipeline and constitute at air chamber two ends and middle three cylinders 3 that gas port arranged, the connection structure that it is characterized in that it is as follows, the admission port of 3 position-5 way valve 1 is connected with external pressure gas source, the air extractor duct C of 3 position-5 way valve 1 is connected with the middle gas port of three cylinders 3, the air extractor duct D of 3 position-5 way valve 1 is connected with the gas port O of quick exhaust valve 2, the air extractor duct E of 3 position-5 way valve 1 is connected with the auxiliary piston 6 end gas port threes of the gas port P of quick exhaust valve 2 and three cylinders 3, and the gas port A of quick exhaust valve 2 is connected with the execution piston of three cylinders 28 end gas ports; Auxiliary piston 6 in aforementioned three cylinders 3 is less than the sectional area of the piston rod 5 of carrying out piston 8 near the sectional area of setting upright guide rod 10 on the side of cylinder end face.

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