A kind of gearbox for bulldozer

Abstract

The invention discloses a gearbox for a bulldozer. The gearbox includes an input shaft and an output shaft, and also includes five single planetary rows, namely the first planetary row, the second planetary row, the third planetary row, the fourth planetary row and The fifth planetary row, the first planetary row, the second planetary row and the third planetary row are connected to the input shaft, the fourth planetary row and the fifth planetary row are connected to the output shaft, and the five planetary rows have a total of There are six clutches, through the simultaneous engagement of different clutches, the switching of different gears can be realized. The bulldozer gearbox proposed by the present invention realizes the shifting function of four forward gears and four reverse gears through five planetary rows, has fewer parts, all uses a single planetary row, is simple to manufacture and install, and has a small structural size.

Description

technical field [0001] The invention relates to the field of gearboxes, in particular to a gearbox for bulldozers. Background technique [0002] Existing gearboxes are divided into two types: manual shifting and power shifting. Because construction machinery adopts manual shifting, the power of the low-gear engine will not be fully utilized, and high-gear machines are difficult to start. Therefore, power shifting is widely used in construction machinery. gearbox. The planetary power shift gearbox has many planetary rows, which has the advantages of balanced force on parts, small structure size, high rigidity, etc., and is widely used in construction machinery. In order to meet the needs of different working conditions and improve driving comfort and fuel economy, bulldozer gearboxes generally need to have 6-8 gears. [0003] However, the existing planetary gearboxes for bulldozers generally use 5 or more planetary rows to achieve only 6 gears, such as CN105351462A, which i...

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Problems solved by technology

[0003] However, the existing planetary gearboxes for bulldozers generally use 5 or more planetary rows to achieve only 6 gears, such as CN105351462A, which is a gearbox that can only achieve 6 gears. There are also patents CN203348495U and patent CN205618616U, both of which are A gearbox that can only achieve a small number of gears and a large number of parts

[0004] There are also some gearboxes that use a double-star row, such as the second planetary row and the fourth planetary row in the patent CN205618616U. The double-star row is used, and the structure is complicated.

[0005] In some schemes, in order to facilitate the extraction of the shaft, the central shaft has a hollow nesting structure. For example, in the patent CN102221076A, the central shaft of the first planetary row has a three-layer nesting structure, which leads to a relatively complicated structure of the central shaft, which is difficult to manufacture and install. The overall size is also relatively large

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