Variable-speed operating valve structure of gearbox of backhoe loader

Abstract

The utility model discloses a variable-speed operating valve structure of a gearbox of a backhoe loader. A box body is provided with a boss surface, a locking threaded hole, an upper oil outlet, a lower oil outlet, an upper clutch oil inlet, a middle clutch oil inlet and a lower clutch oil inlet; seven electromagnetic valves are longitudinally arranged on an integral valve body of the variable speed operating valve, and the valve body is further provided with a locking screw hole, an upper oil inlet, a lower oil inlet and seven clutch oil outlets; the variable-speed operating valve is assembled on the boss surface of the box body through a locking screw and a sealing paper gasket; upper and lower oil outlets of the box body are respectively communicated with upper and lower oil inlets of the valve body; the seven oil outlet holes of the valve body are communicated with clutch shaft oil holes of a gearbox respectively, and the seven oil outlet holes comprise three built-in oil ways and four external oil ways. The lower pile-up electromagnetic valve is simple and compact in structure and low in manufacturing cost, and solves the problems that a lower pile-up electromagnetic valve of a variable-speed operating valve in the prior art is easily damaged by sand and stones during operation due to small ground clearance, and the manufacturing cost is high due to multiple parts and large assembly weight.

Description

Technical Field

[0001] The utility model relates to the technical field of a gearbox assembly of an excavator loader, in particular to a gearbox speed change control valve structure of an excavator loader. Background Art

[0002] As agriculture at home and abroad develops towards mechanization, backhoe loaders are favored by customers for their mobility and flexibility, as well as their multifunctional advantages of being able to perform both shoveling and loading operations. Their market demand is also steadily increasing. Existing backhoe loader gearboxes generally use electro-hydraulic control shifting, and the forward and reverse gears are controlled by 7 solenoid valves on the speed control valve assembly. The speed control valve consists of an upper integrated valve and a lower integrated valve, and is assembled on one side of the box. The defects of this structure are that the upper / lower integrated valves occupy a large assembly space, the solenoid valve of the lower integrated valve has a small ground clearance, and is easily damaged by flying sand and rocks during operation. At the same time, the structure involves many parts and a large assembly weight, which increases the production cost. Summary of the invention

[0003] The utility model aims to provide an integrated excavator loader transmission speed control valve structure with simple and compact structure and low manufacturing cost, so as to solve the problems that the lower integrated valve solenoid valve of the prior art speed control valve is easily damaged by sand and stone during operation due to small ground clearance and has high manufacturing cost due to large assembly weight and large number of parts.

[0004] To achieve the above purpose, the utility model excavator loader transmission speed control valve structure includes a box body 1, a speed control valve 2, a locking screw 3, a sealing paper pad 4, a oil pipe 5, b oil pipe 6, c oil pipe 7 and d oil pipe 8; the box body 1 is provided with a boss surface 1.1, a locking threaded hole 1.2, an upper oil outlet hole 1.3, an upper clutch oil inlet hole 1.4, a lower oil outlet hole 1.5, a middle clutch oil inlet hole 1.6 and a lower clutch oil inlet hole 1.7; the speed control valve 2 includes an integral valve body 2.1, and the valve body 2.1 is equipped with 7 solenoid valves arranged in a longitudinal row, which are respectively the first and second solenoid valves. A four-way solenoid valve 2.12, a first two-position five-way solenoid valve 2.13, a second two-position four-way solenoid valve 2.14, a two-position three-way solenoid valve 2.15, a third two-position four-way solenoid valve 2.16, a second two-position five-way solenoid valve 2.17 and a fourth two-position four-way solenoid valve 2.18; the valve body 2.1 is also provided with a locking screw hole 2.2, an upper oil inlet hole 2.3, an upper clutch oil outlet hole 2.4, a lower oil inlet hole 2.5, a middle clutch oil outlet hole 2.6, a lower clutch oil outlet hole 2.7, a clutch oil outlet hole 2.8, b clutch oil outlet hole 2.9, and c clutch oil outlet hole 2.10 and d clutch oil outlet hole 2.11; the speed control valve 2 is assembled on the boss surface 1.1 of the housing 1 by means of a locking screw 3, and the two are sealed by a sealing paper pad 4; the upper oil outlet hole 1.3 of the housing 1 is connected to the upper oil inlet hole 2.3 of the valve body 2.1; the lower oil outlet hole 1.5 of the housing 1 is connected to the lower oil inlet hole 2.5 of the valve body 2.1; the 7 oil outlet holes provided on the valve body 2.1 are respectively connected to the oil holes of the clutch shafts of the gearbox, including 3 built-in oil circuits and 4 external oil circuits, and the 3 built-in oil circuits are respectively the upper clutch oil outlet hole 2.4 of the valve body 2.1 and the clutch of the housing 1 The oil inlet hole 1.4 of the clutch is connected, the middle clutch oil outlet hole 2.6 of the valve body 2.1 is connected to the middle clutch oil inlet hole 1.6 of the box body 1, and the lower clutch oil outlet hole 2.7 of the valve body 2.1 is connected to the lower clutch oil inlet hole 1.7 of the box body 1; the four external oil circuits are respectively connected to the a clutch oil outlet hole 2.8 and one end of the a oil pipe 5, the b clutch oil outlet hole 2.9 and one end of the b oil pipe 6, the c clutch oil outlet hole 2.10 and one end of the c oil pipe 7, and the d clutch oil outlet hole 2.11 and one end of the d oil pipe 8. The other ends of these four oil pipes are respectively connected to the oil inlet holes of the speed change clutch shaft.

[0005] The above-mentioned gearbox speed control valve structure for a backhoe loader has the following technical features and beneficial effects:

[0006] 1. The integrated speed control valve body structure is adopted, and the solenoid valve is arranged more compactly, which effectively solves the problem in the prior art that the lower end solenoid valve is easily damaged by sand and stones during operation due to the small ground clearance;

[0007] 2. The two-position three-way solenoid valve in the prior art is arranged in the middle of the seven solenoid valves, making the integral valve body structure more compact, which is beneficial to the optimization and weight reduction of the valve body structure, and effectively solves the problem of high manufacturing cost of the prior art speed control valve due to many parts and large assembly weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 The utility model is a schematic diagram of the structure assembly of a speed change control valve of a gearbox of an excavator loader.

[0009] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure in the A direction.

[0010] Figure 3 yes Figure 1 Schematic diagram of the control valve installation surface structure of the middle box.

[0011] Figure 4 yes Figure 1 Schematic diagram of the main structure of the medium speed control valve.

[0012] Figure 5 yes Figure 1 Schematic diagram of the right side structure of the mid-speed control valve.

[0013] Figure 6 yes Figure 1 Schematic diagram of the rear view of the mid-speed control valve.

[0014] Figure 1: Box 1, boss surface 1.1, locking threaded hole 1.2, upper oil outlet hole 1.3, upper clutch oil inlet hole 1.4, lower oil outlet hole 1.5, middle clutch oil inlet hole 1.6, lower clutch oil inlet hole 1.7, speed control valve 2, valve body 2.1, c clutch oil outlet hole 2.10, d clutch oil outlet hole 2.11, first two-position four-way solenoid valve 2.12, first two-position five-way solenoid valve 2.13, second two-position four-way solenoid valve 2.14, two-position three-way solenoid valve Valve 2.15, third two-position four-way solenoid valve 2.16, second two-position five-way solenoid valve 2.17, fourth two-position four-way solenoid valve 2.18, locking screw hole 2.2, upper oil inlet hole 2.3, upper clutch oil outlet hole 2.4, lower oil inlet hole 2.5, middle clutch oil outlet hole 2.6, lower clutch oil outlet hole 2.7, a clutch oil outlet hole 2.8, b clutch oil outlet hole 2.9, locking screw 3, sealing paper pad 4, a oil pipe 5, b oil pipe 6, c oil pipe 7, d oil pipe 8. DETAILED DESCRIPTION

[0015] The structure of the transmission speed control valve of the backhoe loader of the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] Figure 1-Figure 6As shown, the utility model excavator loader transmission speed control valve structure comprises a box body 1, a speed control valve 2, a locking screw 3, a sealing paper pad 4, a oil pipe 5, b oil pipe 6, c oil pipe 7 and d oil pipe 8; the box body 1 is provided with a boss surface 1.1, a locking threaded hole 1.2, an upper oil outlet hole 1.3, an upper clutch oil inlet hole 1.4, a lower oil outlet hole 1.5, a middle clutch oil inlet hole 1.6 and a lower clutch oil inlet hole 1.7; the speed control valve 2 comprises an integral valve body 2.1, on which 7 solenoid valves are arranged in a longitudinal row, namely a first two-position four-way solenoid valve 2.12, a first two-position five-way solenoid valve 2. Solenoid valve 2.13, second two-position four-way solenoid valve 2.14, two-position three-way solenoid valve 2.15, third two-position four-way solenoid valve 2.16, second two-position five-way solenoid valve 2.17 and fourth two-position four-way solenoid valve 2.18; compared with the prior art, the two-position three-way solenoid valve originally arranged at the lower end of the lower integrated valve is changed to the middle of the seven solenoid valves, making the integral valve body structure more compact; the valve body 2.1 is also provided with a locking screw hole 2.2, an upper oil inlet hole 2.3, an upper clutch oil outlet hole 2.4, a lower oil inlet hole 2.5, a middle clutch oil outlet hole 2.6, a lower clutch oil outlet hole 2.7, and a clutch oil outlet hole 2. 8, b clutch oil outlet hole 2.9, c clutch oil outlet hole 2.10 and d clutch oil outlet hole 2.11; the speed control valve 2 is assembled on the boss surface 1.1 of the housing 1 by means of a locking screw 3, and the two are sealed by means of a sealing paper pad 4; the upper oil outlet hole 1.3 of the housing 1 is connected to the upper oil inlet hole 2.3 of the valve body 2.1; the lower oil outlet hole 1.5 of the housing 1 is connected to the lower oil inlet hole 2.5 of the valve body 2.1; the 7 oil outlet holes provided on the valve body 2.1 are respectively connected to the oil holes of the clutch shafts of the gearbox, including 3 built-in oil circuits and 4 external oil circuits, the 3 built-in oil circuits are respectively the upper clutch outlet holes of the valve body 2.1 The oil hole 2.4 is connected to the clutch oil inlet hole 1.4 of the housing 1, the middle clutch oil outlet hole 2.6 of the valve body 2.1 is connected to the middle clutch oil inlet hole 1.6 of the housing 1, and the lower clutch oil outlet hole 2.7 of the valve body 2.1 is connected to the lower clutch oil inlet hole 1.7 of the housing 1; the four external oil circuits are respectively connected to the a clutch oil outlet hole 2.8 and one end of the a oil pipe 5, the b clutch oil outlet hole 2.9 and one end of the b oil pipe 6, the c clutch oil outlet hole 2.10 and one end of the c oil pipe 7, and the d clutch oil outlet hole 2.11 and one end of the d oil pipe 8. The other ends of these four oil pipes are respectively connected to the oil inlet holes of the speed change clutch shaft.

[0017] During operation, the speed control valve supplies oil to different clutch shafts of the gearbox according to the driver's instructions to achieve different gears of the gearbox.

[0018] The utility model discloses a speed change control valve structure for a gearbox of an excavator loader, improves the upper and lower integrated valve structures adopted by the speed change control valve of the prior art into an integral control valve structure, and solves the problems that the lower integrated valve solenoid valve of the speed change control valve of the prior art is easily damaged by sand and stones during operation due to a small ground clearance and has a high manufacturing cost due to a large number of parts and a large assembly weight.

Claims

1. A gearbox speed control valve structure for an excavator loader, characterized by: It comprises a housing (1), a speed control valve (2), a locking screw (3), a sealing paper pad (4), an a oil pipe (5), a b oil pipe (6), a c oil pipe (7) and a d oil pipe (8); the housing (1) is provided with a boss surface (1.1), a locking threaded hole (1.2), an upper oil outlet hole (1.3), an upper clutch oil inlet hole (1.4), a lower oil outlet hole (1.5), a middle clutch oil inlet hole (1.6) and a lower clutch oil inlet hole (1.7); the speed control valve (2) comprises an integral valve body (2.1), on which seven solenoid valves are arranged in a longitudinal row, namely, a first two-position four-way solenoid valve (2.12), a first two-position five-way solenoid valve (2.13), a second two-position five-way solenoid valve (2.14), a second two-position five-way solenoid valve (2.15), a second two-position five-way solenoid valve (2.16), a second two-position five-way solenoid valve (2.17), a second two-position five-way solenoid valve (2.18), a second two-position five-way solenoid valve (2.19), a second two-position five-way solenoid valve (2.20), a second two-position five-way solenoid valve (2.21), a second two-position five-way solenoid valve (2.22), a second two-position five-way solenoid valve (2.23), a second two-position five-way solenoid valve (2.24), a second two-position five-way solenoid valve (2.25), a second two-position five-way solenoid valve (2.26), a second two-position five-way solenoid valve (2.27), a second two-position five-way solenoid valve (2.28), a second two-position five-way solenoid valve (2.29), a second two-position five-way solenoid valve ( A two-way solenoid valve (2.13), a second two-position four-way solenoid valve (2.14), a two-position three-way solenoid valve (2.15), a third two-position four-way solenoid valve (2.16), a second two-position five-way solenoid valve (2.17) and a fourth two-position four-way solenoid valve (2.18); the valve body (2.1) is also provided with a locking screw hole (2.2), an upper oil inlet hole (2.3), an upper clutch oil outlet hole (2.4), a lower oil inlet hole (2.5), a middle clutch oil outlet hole (2.6), a lower clutch oil outlet hole (2.7), a clutch oil outlet hole (2.8), a clutch oil outlet hole (2.9), a clutch oil outlet hole (2.10) and a clutch oil outlet hole (2.11). 1); the speed control valve (2) is assembled on the boss surface (1.1) of the housing (1) by means of a locking screw (3), and the two are sealed by means of a sealing paper pad (4); the upper oil outlet hole (1.3) of the housing (1) is connected to the upper oil inlet hole (2.3) of the valve body (2.1); the lower oil outlet hole (1.5) of the housing (1) is connected to the lower oil inlet hole (2.5) of the valve body (2.1); the seven oil outlet holes provided on the valve body (2.1) are respectively connected to the oil holes of the clutch shafts of the gearbox, including three internal oil circuits and four external oil circuits, the three internal oil circuits being respectively the upper clutch oil outlet hole (2.4) of the valve body (2.1) and the clutch oil inlet hole (2.5) of the housing (1). 1.4), the middle clutch oil outlet hole (2.6) of the valve body (2.1) is connected to the middle clutch oil inlet hole (1.6) of the casing (1), and the lower clutch oil outlet hole (2.7) of the valve body (2.1) is connected to the lower clutch oil inlet hole (1.7) of the casing (1); the four external oil circuits are respectively connected to the a clutch oil outlet hole (2.8) and one end of the a oil pipe (5), the b clutch oil outlet hole (2.9) and one end of the b oil pipe (6), the c clutch oil outlet hole (2.10) and one end of the c oil pipe (7), and the d clutch oil outlet hole (2.11) and one end of the d oil pipe (8), and the other ends of the four oil pipes are respectively connected to the oil inlet holes of the speed change clutch shaft.

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