Lawn mower hydraulic oil way system capable of preventing oil leakage caused by overlarge oil pressure of motor

Abstract

The utility model discloses a mowing machine hydraulic oil way system capable of preventing oil leakage caused by overlarge oil pressure of a motor, which comprises a cutterhead assembly, a motor oil inlet pipe, a motor oil return pipe and a motor oil drainage pipe which are arranged outside the motor, and an adjusting mechanism assembly provided with a one-way valve seat, the oil inlet end of the motor oil inlet pipe is connected with an oil supply pipe through an oil inlet channel in the one-way valve seat, the oil inlet end of an oil return channel in the one-way valve seat is connected with the oil outlet end of the motor oil return pipe, and the oil outlet end of the oil return channel is connected with the oil inlet end of the oil return pipe and the oil outlet end of the motor oil drainage pipe through a first three-way connector. The oil outlet end of the motor oil drainage pipe is connected with one port of the first three-way connector through a second three-way connector, and one port of the second three-way connector is connected with an energy accumulator. When the rotating speed of the cutter head is instantaneously reduced or the cutter head does not rotate, hydraulic oil in the motor flows back through the motor oil return pipe and / or the motor oil drainage pipe and is cached in the energy accumulator, instantaneous sudden increase of oil pressure in the motor is avoided, and the risk of fracture failure of a motor oil seal is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of lawnmower equipment, specifically to a hydraulic oil circuit system for lawnmowers that prevents oil leakage due to excessive motor oil pressure. Background Technology

[0002] A lawnmower, also known as a lawn mower, lawn trimmer, or lawn mower, is a mechanical tool used to trim lawns, vegetation, and other vegetation. Current lawnmowers are typically towed by a tractor and trim the lawn along the tractor's path. The width of the mowing strip is equal to the width of the mowing device itself. When obstacles such as trees appear in front of the mowing path, the mowing device must avoid the trees, meaning the lawn around the trees cannot be effectively trimmed.

[0003] Currently, some lawnmowers on the market can swing sideways when encountering obstacles. However, due to the complexity of lawn terrain, existing side-swinging lawnmowers cannot effectively remove grass for various terrains, resulting in poor applicability. To address this, Chinese utility model patent application number 201721522072.8 discloses a terrain-following side-swinging lawnmower mechanism for lawnmowers, including a fixed frame, a rotating seat, a side-swinging mechanism, and a cutter head. The top of the cutter head is provided with a connecting seat, which is connected to the rotating seat via a connecting rod assembly. The connecting rod assembly includes a connecting rod, a telescopic rod, and a spring. The two ends of the connecting rod are hinged to the rotating seat and the connecting seat, respectively, and the two ends of the telescopic rod are hinged to the rotating seat and the connecting seat, respectively. The rotating seat, connecting rod, connecting seat, and telescopic rod form a parallelogram connection structure. The two ends of the spring are located at the diagonals of the parallelogram connection structure. The bottom of the cutter head is provided with blades and a turntable, with the height of the turntable lower than that of the blades. During operation, the blade head of this mowing mechanism is in a floating state, easily undulating according to the terrain. Combined with a rotating disc at the bottom of the blade head, it maintains a certain distance between the blades and the ground, ensuring the blade head consistently follows the terrain for optimal mowing results. The hydraulic motor of this mowing mechanism has three external pipes: a motor inlet pipe, a motor return pipe, and a motor drain pipe. During normal operation, the motor inlet pipe supplies oil to the motor, and the motor return pipe drains the oil flowing back from the motor's oil chamber. This converts the pressurized oil flowing through the hydraulic system into kinetic energy for the blade head, driving the blades mounted on the blade head to rotate at high speed. However, when the blade head encounters an obstacle, causing a sudden decrease in speed or a complete stop, the overflow valve at the outlet of the return pipe may not have had time to open. This causes a sudden increase in pressure within the motor's internal oil chamber. If the pressure exceeds the maximum pressure that the oil seal on the motor can withstand, the oil seal will rupture and fail, resulting in oil leakage from the motor. If the motor leaks oil, the machine needs to be stopped for repair, which severely restricts the mower's mowing efficiency. Therefore, this invention proposes a hydraulic circuit system for mowers to prevent oil leakage due to excessive motor oil pressure, aiming to solve the aforementioned problem. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects in the existing technology and provide a hydraulic circuit system for lawnmowers that prevents oil leakage due to excessive motor oil pressure. An accumulator is installed at the oil outlet of the motor's drain pipe and the oil outlet of the return channel inside the one-way valve seat via two T-joints. When the cutter head assembly encounters an obstacle, causing the cutter head speed to decrease instantaneously or stop, the hydraulic oil in the motor's internal oil chamber can flow back through the motor return pipe and / or the motor drain pipe and be buffered inside the accumulator. This avoids a sudden surge in oil pressure in the motor's internal oil chamber, reduces the risk of oil seal rupture and failure on the motor, extends the overall service life of the motor, and helps improve the lawnmower's mowing efficiency. The overall structural design is ingenious and reasonable, requiring minimal structural modifications compared to traditional lawnmower hydraulic circuit systems, and is highly feasible and practical.

[0005] To achieve the above objectives, the technical solution of this utility model is to design a hydraulic oil circuit system for a lawnmower that prevents oil leakage due to excessive motor oil pressure. The system includes an adjustment mechanism assembly and a cutter head assembly. A mounting base and a motor are mounted on the top of the cutter head assembly. The front end of the adjustment mechanism assembly is hinged to the mounting base. The output shaft of the motor is drively connected to the cutter head shaft, which is installed inside the central hole of the mounting base. An oil inlet pipe, a return pipe, and a drain pipe are installed externally on the motor and communicate with its internal oil chamber. A one-way valve seat is mounted on the adjustment mechanism assembly, and the one-way valve seat has an oil inlet channel and a return channel inside. The motor oil inlet pipe has an inlet end connected to an oil supply pipe via an oil inlet channel inside a one-way valve seat. The motor return oil pipe has an outlet end connected to the inlet end of the return oil channel inside the one-way valve seat. The outlet end of the return oil channel inside the one-way valve seat is connected to the inlet end of the return oil pipe and the outlet end of the motor drain pipe via a three-way connector. The inlet end of the oil supply pipe is connected to the oil supply port of the oil supply equipment. The outlet end of the return oil pipe is connected to the return port of the oil supply equipment via an overflow valve. The outlet end of the motor drain pipe is connected to one port of the three-way connector, and one port of the three-way connector is connected to an accumulator.

[0006] This utility model discloses a hydraulic circuit system for lawnmowers that prevents oil leakage due to excessive motor oil pressure. An accumulator is installed at the outlet of the motor's drain pipe and the outlet of the return oil channel inside the one-way valve seat via two T-joints. When the cutter head assembly encounters an obstacle, causing a momentary decrease or stop in the cutter head speed, the hydraulic oil in the motor's internal oil chamber can flow back through the motor return pipe and / or the motor drain pipe and be buffered inside the accumulator. This prevents a sudden surge in oil pressure in the motor's internal oil chamber, reduces the risk of oil seal rupture and failure, extends the overall service life of the motor, and helps improve the lawnmower's mowing efficiency. The overall structural design is ingenious and reasonable, requiring minimal structural modifications compared to traditional lawnmower hydraulic circuit systems, making it highly feasible and practical.

[0007] A preferred technical solution is that the outer wall of the motor is provided with an oil inlet port, an oil return port, and an oil drain port that communicate with the internal oil chamber. The oil outlet end of the motor oil inlet pipe is connected to the oil inlet port on the outer wall of the motor via an adapter joint. The oil inlet end of the motor oil return pipe is connected to the oil return port on the outer wall of the motor via an adapter joint. The oil inlet end of the motor drain pipe is connected to the drain port on the outer wall of the motor via a one-way valve. The connection method between the oil outlet end of the motor oil inlet pipe, the oil inlet end of the motor oil return pipe, and the oil inlet end of the motor drain pipe and the corresponding ports on the outer wall of the motor is simple and has good sealing performance, ensuring that there is no oil leakage at the interface end of these three pipelines on the outer wall of the motor.

[0008] A further preferred technical solution is that the oil inlet and return ports of the motor are located on its left and right side walls, while the oil drain port of the motor is located on its top. The one-way valve is connected to the oil inlet end of the motor's oil drain pipe via a right-angle connector. The reasonable distribution of the oil inlet, return, and drain ports on the outer wall of the motor ensures smoothness and convenience when connecting and installing the ends of the motor's oil inlet, return, and drain pipes to the corresponding ports on the outer wall of the motor.

[0009] A further preferred technical solution is that the oil outlet of the motor drain pipe is connected to one port of the tee connector two via an end connector. This connection method is simple, provides good sealing, and effectively prevents oil leakage from the oil outlet of the motor drain pipe.

[0010] A further preferred technical solution is that the outlet end of the motor return oil pipe is connected to the inlet end of the internal return oil channel of the one-way valve seat via an adapter joint; the inlet end of the motor inlet oil pipe is connected to the outlet end of the internal inlet channel of the one-way valve seat via an adapter joint; and the outlet end of the supply oil pipe is connected to the inlet end of the internal inlet channel of the one-way valve seat via an adapter joint. The connection method between the inlet end of the motor inlet oil pipe, the outlet end of the motor return oil pipe, and the outlet end of the supply oil pipe and the corresponding ports of the one-way valve seat is simple and has good sealing performance, ensuring that no oil leakage occurs at the interface ends of these three pipelines on the outer wall of the one-way valve seat.

[0011] A further preferred technical solution includes a mounting bracket assembly, wherein the front end of the mounting bracket assembly is hinged to the rear end of the adjustment mechanism assembly.

[0012] The advantages and beneficial effects of this utility model are as follows:

[0013] 1. This utility model discloses a hydraulic circuit system for lawnmowers that prevents oil leakage due to excessive motor oil pressure. An accumulator is installed at the outlet of the motor's drain pipe and the outlet of the return oil channel inside the one-way valve seat via two T-connectors. When the cutter head assembly encounters an obstacle, causing a momentary decrease or stop in the cutter head speed, the hydraulic oil in the motor's internal oil chamber can flow back through the motor return pipe and / or the motor drain pipe and be buffered inside the accumulator. This prevents a sudden surge in oil pressure in the motor's internal oil chamber, reduces the risk of oil seal rupture and failure, extends the overall service life of the motor, and helps improve the lawnmower's mowing efficiency. The overall structural design is ingenious and reasonable, requiring minimal structural modifications compared to traditional lawnmower hydraulic circuit systems, making it highly feasible and practical.

[0014] 2. The connection between the oil outlet of the motor inlet pipe, the oil inlet of the motor return pipe, and the oil inlet of the motor drain pipe and the corresponding ports on the outer wall of the motor is simple and has good sealing performance, ensuring that there will be no oil leakage at the interface end of these three pipes on the outer wall of the motor; the connection between the oil inlet of the motor inlet pipe, the oil outlet of the motor return pipe, and the oil outlet of the oil supply pipe and the corresponding ports on the one-way valve seat is simple and has good sealing performance, ensuring that there will be no oil leakage at the interface end of these three pipes on the outer wall of the one-way valve seat.

[0015] 3. The oil inlet port, oil return port, and oil drain port are reasonably distributed on the outer wall of the motor, ensuring smoothness and convenience when connecting and installing the ends of the motor oil inlet pipe, motor oil return pipe, and motor oil drain pipe to the corresponding ports on the outer wall of the motor.

[0016] 4. The oil outlet of the motor drain pipe is connected to one port of the tee connector via an end connector. This connection method is simple, provides good sealing, and effectively prevents oil leakage from the motor drain pipe's outlet. Attached Figure Description

[0017] Figure 1 This is a three-dimensional view from the left front side of the hydraulic circuit system of a lawnmower designed to prevent oil leakage due to excessive motor oil pressure.

[0018] Figure 2 yes Figure 1 A magnified view of a section at point H in the middle;

[0019] Figure 3 This is a disassembled structural diagram of the hydraulic oil circuit system of a lawnmower to prevent oil leakage due to excessive motor oil pressure, according to this utility model.

[0020] Figure 4 yes Figure 3 A magnified view of the area at point W in the middle.

[0021] In the diagram: 1. Adjustment mechanism assembly; 2. Cutter head assembly; 3. Mounting bracket assembly; 4. Motor; 5. One-way valve seat; 6. Motor inlet pipe; 7. Motor return pipe; 8. Motor drain pipe; 9. Supply pipe; 10. Return pipe; 11. Accumulator; 2-1. Mounting base; 2-2. Cutter head shaft; a. Transition joint; b. One-way valve; c. Right-angle joint; d. End joint; e. T-joint one; f. T-joint two. Detailed Implementation

[0022] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0023] Example

[0024] like Figures 1-4As shown, this utility model is a hydraulic circuit system for a lawnmower to prevent oil leakage due to excessive motor oil pressure. It includes an adjustment mechanism assembly 1 and a cutter head assembly 2. The cutter head assembly 2 has a mounting base 2-1 and a motor 4 mounted on its top. The front end of the adjustment mechanism assembly 1 is hinged to the mounting base 2-1. The output shaft of the motor 4 is connected to the cutter head shaft 2-2, which is installed inside the central hole of the mounting base 2-1. The motor 4 has an external oil inlet pipe 6, a motor return pipe 7, and a motor drain pipe 8, all communicating with its internal oil chamber. A one-way valve seat 5 is mounted on the adjustment mechanism assembly 1, and the one-way valve seat 5 has an oil inlet channel and a oil return channel inside. The oil inlet end of the motor oil inlet pipe 6 is connected to the oil supply pipe 9 through the oil inlet channel inside the one-way valve seat 5. The oil outlet end of the motor oil return pipe 7 is connected to the oil inlet end of the oil return channel inside the one-way valve seat 5. The oil outlet end of the oil return channel inside the one-way valve seat 5 is connected to the oil inlet end of the oil return pipe 10 and the oil outlet end of the motor drain pipe 8 through a three-way connector e. The oil inlet end of the oil supply pipe 9 is connected to the oil supply port of the oil supply equipment. The oil outlet end of the oil return pipe 10 is connected to the oil return port of the oil supply equipment through an overflow valve. The oil outlet end of the motor drain pipe 8 is connected to one port of the three-way connector e through a three-way connector f. One port of the three-way connector f is connected to an accumulator 11.

[0025] Preferably, the outer wall of the motor 4 is provided with an oil inlet port, an oil return port, and an oil drain port that communicate with its internal oil chamber. The oil outlet end of the motor oil inlet pipe 6 is connected to the oil inlet port on the outer wall of the motor 4 through a transition joint a. The oil inlet end of the motor oil return pipe 7 is connected to the oil return port on the outer wall of the motor 4 through a transition joint a. The oil inlet end of the motor oil drain pipe 8 is connected to the oil drain port on the outer wall of the motor 4 through a one-way valve b.

[0026] More preferably, the oil inlet and return ports on the motor 4 are located on its left and right side walls, the oil drain port on the motor 4 is located on its top, and the one-way valve b is connected to the oil inlet end of the motor drain pipe 8 through a right-angle connector c.

[0027] More preferably, the oil outlet of the motor drain pipe 8 is connected to one port of the tee connector 2f via an end connector d.

[0028] More preferably, the oil outlet of the motor return oil pipe 7 is connected to the oil inlet of the internal return oil channel of the one-way valve seat 5 through a transition joint a, the oil inlet of the motor inlet pipe 6 is connected to the oil outlet of the internal inlet channel of the one-way valve seat 5 through a transition joint a, and the oil outlet of the oil supply pipe 9 is connected to the oil inlet of the internal inlet channel of the one-way valve seat 5 through a transition joint a.

[0029] More preferably, it also includes a mounting bracket assembly 3, the front end of which is hinged to the rear end of the adjustment mechanism assembly 1.

[0030] This utility model discloses a hydraulic circuit system for lawnmowers that prevents oil leakage due to excessive motor oil pressure. An accumulator is installed at the outlet of the motor's drain pipe and the outlet of the return oil channel inside the one-way valve seat via two T-joints. When the cutter head assembly encounters an obstacle, causing a momentary decrease or stop in the cutter head speed, the hydraulic oil in the motor's internal oil chamber can flow back through the motor return pipe and / or the motor drain pipe and be buffered inside the accumulator. This prevents a sudden surge in oil pressure in the motor's internal oil chamber, reduces the risk of oil seal rupture and failure, extends the overall service life of the motor, and helps improve the lawnmower's mowing efficiency. The overall structural design is ingenious and reasonable, requiring minimal structural modifications compared to traditional lawnmower hydraulic circuit systems, making it highly feasible and practical.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A hydraulic circuit system for a lawnmower to prevent oil leakage due to excessive motor oil pressure, comprising an adjustment mechanism assembly (1) and a cutter head assembly (2), wherein a mounting base (2-1) and a motor (4) are mounted on the top of the cutter head assembly (2), the front end of the adjustment mechanism assembly (1) is hinged to the mounting base (2-1), the output shaft of the motor (4) is connected to the cutter head shaft (2-2) mounted inside the center hole of the mounting base (2-1), the motor (4) is externally mounted with a motor inlet pipe (6), a motor return pipe (7), and a motor drain pipe (8) communicating with its internal oil chamber, and a one-way valve is mounted on the adjustment mechanism assembly (1). The valve seat (5) has an oil inlet channel and an oil return channel inside. The oil inlet end of the motor oil inlet pipe (6) is connected to the oil supply pipe (9) through the oil inlet channel inside the one-way valve seat (5). The oil outlet end of the motor oil return pipe (7) is connected to the oil inlet end of the oil return channel inside the one-way valve seat (5). The oil outlet end of the oil return channel inside the one-way valve seat (5) is connected to the oil inlet end of the oil return pipe (10) and the oil outlet end of the motor drain pipe (8) through a three-way connector (e). The oil inlet end of the oil supply pipe (9) is connected to the oil supply port of the oil supply equipment. The oil outlet end of the oil return pipe (10) is connected to the oil return port of the oil supply equipment through an overflow valve. The oil outlet of the motor drain pipe (8) is connected to one port of the three-way connector (e) via a two-way connector (f), and one port of the three-way connector (f) is connected to an accumulator (11).

2. The hydraulic circuit system for lawnmowers to prevent oil leakage due to excessive motor oil pressure as described in claim 1, characterized in that, The motor (4) has an oil inlet port, an oil return port, and an oil drain port on its outer side wall that communicate with its internal oil chamber. The oil outlet end of the motor oil inlet pipe (6) is connected to the oil inlet port on the outer side wall of the motor (4) through a transition joint (a). The oil inlet end of the motor oil return pipe (7) is connected to the oil return port on the outer side wall of the motor (4) through a transition joint (a). The oil inlet end of the motor oil drain pipe (8) is connected to the oil drain port on the outer side wall of the motor (4) through a one-way valve (b).

3. The hydraulic circuit system for lawnmowers to prevent oil leakage due to excessive motor oil pressure as described in claim 2, characterized in that, The oil inlet and return ports on the motor (4) are located on its left and right side walls, and the oil drain port on the motor (4) is located on its top. The one-way valve (b) is connected to the oil inlet of the motor drain pipe (8) through a right-angle connector (c).

4. The hydraulic circuit system for a lawnmower to prevent oil leakage due to excessive motor oil pressure as described in claim 3, characterized in that, The oil outlet of the motor drain pipe (8) is connected to one port of the tee connector (f) via an end connector (d).

5. The hydraulic circuit system for a lawnmower to prevent oil leakage due to excessive motor oil pressure as described in claim 4, characterized in that, The oil outlet of the motor return pipe (7) is connected to the oil inlet of the oil return channel inside the one-way valve seat (5) through a transition joint (a). The oil inlet of the motor inlet pipe (6) is connected to the oil outlet of the oil inlet channel inside the one-way valve seat (5) through a transition joint (a). The oil outlet of the oil supply pipe (9) is connected to the oil inlet of the oil inlet channel inside the one-way valve seat (5) through a transition joint (a).

6. The hydraulic circuit system for a lawnmower to prevent oil leakage due to excessive motor oil pressure as described in any one of claims 1 to 5, characterized in that, It also includes a mounting bracket assembly (3), the front end of which is hinged to the rear end of the adjustment mechanism assembly (1).

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