Outdoor garden operation vehicle

Abstract

The invention relates to an outdoor garden operation vehicle which comprises a vehicle frame, a left drive axle assembly, a right drive axle assembly, a mowing component, a power supply component and a brake module, and the brake module comprises a brake parking assembly and a foot brake pump; the braking and parking assembly comprises a pedal assembly, the pedal assembly is hinged to the frame, the pedal assembly and the foot brake pump form a labor-saving lever, and a user steps on the pedal assembly to trigger the foot brake pump to generate braking force on the left drive axle assembly and the right drive axle assembly. Due to the existence of the labor-saving lever, enough braking force can be generated without too large force of directly treading the pedal assembly by a user, and the technical effect that effective braking can be achieved only with very large force in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of garden operation vehicles, and particularly to an outdoor garden operation vehicle. Background Art

[0002] Outdoor garden operation vehicles generally refer to vehicles used for garden operations outdoors, mainly including vehicles for cutting and maintaining the grasslands in gardens.

[0003] The whole vehicle of a garden operation vehicle needs to move in the garden, so it must be equipped with a braking component for braking; for example, Chinese Patent No. CN207269396U discloses a braking and parking mechanism for an electric zero-turn mower, including an operating mechanism and a braking mechanism; the operating mechanism is located at the front end of the vehicle frame and includes a brake pedal and a parking pedal, and the braking mechanism includes a hub motor connected to the wheel and a brake caliper located on the vehicle frame, and the brake caliper corresponds to the brake disc of the hub motor. It can be clearly known from referring to its attached drawings that the brake disc of this technology is located on the wheel axle. Although this patent can achieve a certain braking effect on the wheel, because its brake disc is arranged on the wheel axle, the brake caliper needs to provide a very large clamping torque to achieve effective braking force, and it is difficult for users to directly step on it to achieve a good braking effect;

[0004] In order to enable the vehicle to effectively stay in a certain position, a parking system is generally set on the vehicle to maintain its relative position when the vehicle is parked. For example, US Patent No. US11589513B2 discloses an integrated parking braking system for a riding lawn care vehicle, including a parking brake device that is activated according to the detection of the presence or absence of an operator near the electric off-road work vehicle by an operator presence system. The operator presence system can send a signal to the controller, and the controller may command the parking brake device to be activated between the engaged state and the non-engaged state. There is an obvious difference between the braking and parking operations in this patent, and according to the user's operating habits, when the braking force is relatively large, it should be equivalent to the parking state. Therefore, the operating habits of this patent make it difficult for users to adapt.

[0005] Braking generally involves pressing or stepping on a certain component to apply braking force to the brake system. Due to the structural limitations of the brake disc in the brake system, the friction plate that contacts it cannot continue to move after it moves to completely contact the brake disc, resulting in the user being unable to continue pressing or stepping on the component and feeling that the brakes are too hard, which brings a bad user experience. For example, a Chinese patent with publication number CN114684080B discloses a braking system for an electric lawn mower. The patent integrates service braking, emergency braking and parking braking functions through a brake operating assembly, but it sets a lower limit bolt to limit the position of the pedal, which obviously results in the pedal being unable to continue to be stepped on after being braked, resulting in a feeling of too hard braking. In addition, in the patent, stepping on the brake pedal a second time in the parking state will release the parking state and increase the possibility of misoperation.

[0006] In view of this, it is indeed necessary to provide an outdoor gardening operation vehicle to overcome the defects of the prior art. [Summary of the invention]

[0007] In view of the deficiencies of the prior art, an object of the present invention is to provide an outdoor gardening work vehicle that can achieve sufficient braking force without the user having to use too much force.

[0008] The technical solution adopted by the present invention to solve the existing technical problems is: an outdoor gardening operation vehicle, comprising: a frame;

[0009] A left drive axle assembly and a right drive axle assembly, wherein the left drive axle assembly is mechanically connected to the left drive motor and the left drive wheel to transmit the power of the left drive motor to the left drive wheel; and the right drive axle assembly is mechanically connected to the right drive motor and the right drive wheel to transmit the power of the right drive motor to the right drive wheel;

[0010] A mowing component is arranged at the lower part of the frame and is used to produce a cutting effect on the vegetation on the ground;

[0011] A power supply component, electrically connected to the left drive motor, the right drive motor and the mowing component, and used to supply power to the left drive motor, the right drive motor and the mowing component;

[0012] Braking module, comprising:

[0013] A parking brake assembly and a foot brake pump; the parking brake assembly includes a pedal assembly, which is hinged to the frame and forms a lever with the foot brake pump. When a user steps on the pedal assembly, the foot brake pump is triggered to generate braking force on the left drive axle assembly and the right drive axle assembly.

[0014] A further improvement is that the pedal assembly and the foot brake pump form a labor-saving lever, and when the user steps on the pedal assembly, the ratio of the input force arm to the output force arm of the labor-saving lever is 1 to 20:1.

[0015] A further improvement solution is that the braking module further includes: a hydraulic pipe, a left brake assembly, and a right brake assembly;

[0016] When the user steps on the foot pedal assembly, it triggers the foot brake pump to generate braking pressure, which acts on the left brake assembly and the right brake assembly through the hydraulic pipe at the same time, generating braking force on the left drive axle assembly and the right drive axle assembly, so that the left drive wheel and the right drive wheel are braked;

[0017] The magnitude of the stepping force for the user to step on the foot pedal assembly to achieve braking is 20N to 500N.

[0018] A further improvement solution is that the magnitude of the stepping force for the user to step on the foot pedal assembly to achieve braking is 30N to 200N.

[0019] A further improvement solution is that the left drive axle assembly and the right drive axle assembly are selected as a reduction gearbox of grade 2 or above, and the reduction gearbox includes an input shaft, an output shaft, and an intermediate shaft;

[0020] The left brake assembly and the right brake assembly are respectively arranged on the non-output shafts of the corresponding reduction gearboxes.

[0021] A further improvement solution is that the left brake assembly and the right brake assembly are respectively arranged on the intermediate shafts of the corresponding reduction gearboxes.

[0022] A further improvement solution is that the left brake assembly and the right brake assembly both include brake slave cylinders installed on the corresponding drive axle assemblies, and a brake disc is fixedly connected to the shaft where the left brake assembly or the right brake assembly is set; when the user steps on the foot pedal assembly, the brake slave cylinder squeezes the brake disc to generate braking force.

[0023] A further improvement solution is that the brake slave cylinder includes a slave cylinder hydraulic cylinder, a slave cylinder rod, and a friction plate. When the foot brake pump is connected to the slave cylinder hydraulic cylinder through the hydraulic pipe and provides braking pressure, the slave cylinder rod makes the friction plate squeeze the brake disc to form braking force.

[0024] A further improvement solution is that the number of cylinders of the brake slave cylinder is odd, the slave cylinder hydraulic cylinder is slidably installed on the vehicle frame or the corresponding reduction gearbox, the friction plate includes a dynamic friction plate and a static friction plate, the dynamic friction plate is fixed to the slave cylinder rod and is located on one side of the brake disc, the static friction plate is arranged on the other side of the brake disc, and when the foot brake pump provides braking pressure to the slave cylinder hydraulic cylinder, the slave cylinder rod pushes the dynamic friction plate and the static friction plate to press against the brake disc.

[0025] A further improvement solution is that the number of cylinders of the brake slave cylinder is even, the slave cylinder hydraulic cylinder is slidably installed on the vehicle frame or the corresponding reduction gearbox, two friction plates are fixed to the slave cylinder rod and are located on both sides of the brake disc, and when the foot brake pump provides braking pressure to the slave cylinder hydraulic cylinder, the slave cylinder rod pushes the two dynamic friction plates to press against the brake disc.

[0026] A further improvement solution is as follows: a floating mounting bracket is fixed on the vehicle frame or the corresponding reduction gearbox, and the slave cylinder hydraulic cylinder is slidably connected to the floating mounting bracket.

[0027] A further improvement solution is as follows: the thickness of the brake disc is 2 mm to 6 mm, and the diameter of the brake disc is 60 mm to 300 mm.

[0028] A further improvement solution is as follows: the hydraulic pressure range of the brake slave cylinder is 2 Mpa to 40 Mpa, and the piston stroke of the cylinder rod of the brake slave cylinder is 0.5 mm to 20 mm.

[0029] A further improvement solution is as follows: the diameter of the cylinder rod of the foot brake pump is 5 mm to 30 mm, the diameter of the slave cylinder hydraulic cylinder is 5 mm to 40 mm, and the stroke of the cylinder rod of the foot brake pump is 5 mm to 100 mm.

[0030] A further improvement solution is as follows: the reduction ratio of the intermediate shaft and the corresponding output shaft of the left brake assembly or the right brake assembly is set to be 1 to 50.

[0031] A further improvement solution is as follows: the left drive axle assembly and the right drive axle assembly select a two-stage reduction gearbox, and the reduction ratio of the intermediate shaft and the corresponding output shaft of the left brake assembly or the right brake assembly is set to be 3 to 6.

[0032] A further improvement solution is as follows: the brake parking assembly further includes a rotating plate and a brake spring. The rotating plate is rotatably connected to the vehicle frame. The foot pedal assembly is fixedly connected to the rotating plate. The two ends of the brake spring are respectively connected to the vehicle frame and the rotating plate. A threaded push rod is connected to the rotating plate. When the user steps on the foot pedal assembly, the rotating plate rotates and pulls the brake spring, pushing the threaded push rod to press the foot brake pump and generate a braking force.

[0033] A further improvement solution is as follows: the brake spring selects a brake torsion spring, and one end of the brake torsion spring rotates synchronously when the user steps on the foot pedal assembly to make the rotating plate rotate.

[0034] A further improvement solution is as follows: the brake spring selects a brake compression spring, and the rotating plate rotates and compresses the brake compression spring when the user steps on the foot pedal assembly.

[0035] A further improvement solution is as follows: the brake spring selects a brake tension spring, and the rotating plate rotates and stretches the brake tension spring when the user steps on the foot pedal assembly.

[0036] A further improvement solution is as follows: the brake parking assembly further includes a fixed bracket fixedly connected to the vehicle frame. The rotating plate is rotatably connected to the fixed bracket. The two ends of the brake tension spring are respectively connected to the fixed bracket and the rotating plate.

[0037] A further improvement solution is as follows: The pedal assembly includes a main pedal, a sub-pedal, a hook plate, and a hook plate torsion spring, and a limiting rod is fixedly connected to the vehicle frame; the hook plate is rotatably connected to the main pedal, and when the main pedal is stepped on by a user, the hook plate can be hooked to the limiting rod to make the braking module in a parking state. The hook plate torsion spring is arranged on the rotating shaft of the hook plate and is used to generate an elastic force on the hook plate to keep it hooked to the limiting rod in the parking state.

[0038] The sub-pedal is movably connected to the main pedal, and when the sub-pedal is stepped on by a user, the hook plate can be disengaged from the limiting rod.

[0039] A further improvement solution is as follows: The maintaining force of the hook plate torsion spring to maintain the contact between the hook plate and the limiting rod is 5N - 30N.

[0040] A further improvement solution is as follows: The maintaining force of the hook plate torsion spring to maintain the contact between the hook plate and the limiting rod is 7N.

[0041] A further improvement solution is as follows: The main pedal and the sub-pedal can be stepped on simultaneously or separately with a single foot.

[0042] A further improvement solution is as follows: When the main pedal is stepped on by a user, at least one of the two surfaces where the hook plate and the limiting rod first come into contact is a curved surface, and when the user steps on the main pedal to make the hook plate abut against the limiting rod, the hook plate can rotate until the inner side of the hook plate bypasses the limiting rod and is hooked to the limiting rod.

[0043] A further improvement solution is as follows: When the sub-pedal is stepped on by a user, it moves and presses the hook plate, causing the hook plate to rotate away from the limiting rod and disengage from the limiting rod.

[0044] A further improvement solution is as follows: The maximum rotation angle of the hook plate when the user steps on the sub-pedal to drive the hook plate from the state of being hooked to the limiting rod to the state of disengaging from the limiting rod is 5° - 30°.

[0045] A further improvement solution is as follows: The sub-pedal is rotatably connected to the main pedal, and the rotation angle range of the sub-pedal when the user steps on it is 0 - 90°.

[0046] A further improvement solution is as follows: A sub-pedal torsion spring is arranged at the hinge joint between the sub-pedal and the main pedal, and the sub-pedal torsion spring makes the sub-pedal maintain a state of not pressing the hook plate when not being stepped on.

[0047] A further improvement solution is as follows: The stepping force for the user to step on the sub-pedal to disengage the hook plate from the limiting rod is 3N - 100N.

[0048] A further improvement solution is as follows: The outdoor gardening operation vehicle further includes an identification module, a control system, and a reminder module;

[0049] The identification module is used to detect whether the main pedal is stepped on;

[0050] The control system includes a whole-machine control module, a motor control module, and a battery management module. The whole-machine control module, the motor control module, and the battery management module are connected by signals to each other. The battery management module is connected by signal to a power supply component, and the motor control module is connected by signal to a left drive motor and a right drive motor;

[0051] When the recognition module detects that the main pedal is stepped on, it controls the left drive motor and the right drive motor to stop rotating through the control system, and sends a braking state reminder to the user through the reminder module.

[0052] A further improvement solution is: The recognition module includes a microswitch arranged on the frame. A switch pressing plate is fixed on the rotating plate, and the switch pressing plate presses the microswitch in the natural release state of the main pedal; when the user steps on the main pedal to drive the rotating plate to rotate, the switch pressing plate is separated from the microswitch, and at this time the microswitch is triggered to control the left drive motor and the right drive motor to stop rotating.

[0053] A further improvement solution is: A switch box is fixedly arranged on the fixed bracket, and both the microswitch and the switch pressing plate are installed in the switch box.

[0054] A further improvement solution is: An oil brake force damping adjustment mechanism is arranged at the foot brake pump, so that when the hydraulic oil in the foot brake pump is compressed to the limit, the foot pedal assembly can be continuously stepped on.

[0055] A further improvement solution is: The oil brake force damping adjustment mechanism includes an oil pump bracket and a damping member. The oil pump bracket is fixed to the vehicle frame, and the damping member is connected to the foot brake pump and the oil pump bracket.

[0056] A further improvement solution is: The oil brake force damping adjustment mechanism further includes a guiding member connected to the foot brake pump, and the guiding member is used to limit the foot brake pump to reciprocate only in the direction of being squeezed by the foot pedal assembly.

[0057] A further improvement solution is: The damping member is selected as a damping compression spring, and the guiding member is selected as a bolt. The bolt sequentially penetrates through the foot brake pump, the damping compression spring and is threadedly connected to the oil pump bracket.

[0058] A further improvement solution is: The damping member has an initial damping force after assembly.

[0059] A further improvement solution is: The damping compression spring is in state 1 when the main pedal is in the natural release state, and the damping compression spring is in state 2 when the hook plate is hooked on the limiting rod. The compression amount of the damping compression spring in state 2 is greater than that in state 1.

[0060] A further improvement solution is: The difference in the compression amount of the damping compression spring between state 2 and state 1 is 1 mm to 60 mm.

[0061] A further improvement solution is as follows: An adjusting nut is arranged between the threaded push rod and the rotating plate. The adjusting nut is connected to the rotating plate, the threaded push rod is in threaded connection with the adjusting nut, and one end of the threaded push rod away from the adjusting nut abuts against the foot brake pump.

[0062] A further improvement solution is as follows: It further includes a user seat connected to the vehicle frame.

[0063] Compared with the prior art, the present invention has the following beneficial effects:

[0064] In the present invention, the connection between the pedal assembly and the foot brake pump is set as a labor-saving lever, and the brake disc is arranged on the non-output shaft of the reduction gearbox. By using the reduction ratio of the reduction gearbox, the force for the user to directly step on the pedal assembly does not need to be too large to generate sufficient braking force, solving the technical problem in the prior art that a very large force is required to achieve effective braking.

[0065] In the present invention, stepping on the main pedal can achieve braking, and stepping on the main pedal more forcefully can achieve parking. The switching between the braking and parking modes is more in line with the user's usage habits; when it is necessary to release the parking mode, only the auxiliary pedal needs to be stepped on, and the auxiliary pedal is integrated on one side of the main pedal, enabling the user to complete the operations of braking, parking, and releasing the parking mode with a single foot, and the overall operation is convenient.

[0066] In addition, in the present invention, the foot brake pump is floatingly installed on the vehicle frame through an oil brake force damping adjustment mechanism. When the user steps on the pedal assembly and the friction plate of the brake assembly completely abuts against the brake disc, the pedal assembly can still be stepped on downward by the user for a certain distance, so that the user does not feel the feedback of "too hard" during the entire process of stepping on the pedal assembly; and the damping member in the oil brake force damping adjustment mechanism has an initial damping force after assembly, which can make the pedal rebound force received by the user during the entire process of stepping on the pedal assembly increase gradually, and there will be no interval where the rebound force increases significantly, improving the overall braking feeling of the user. [Description of the Drawings]

[0067] The following further describes in detail the specific embodiments of the present invention with reference to the drawings:

[0068] Figure 1 It is a three-dimensional view of an outdoor gardening work vehicle according to the first embodiment of the present invention;

[0069] Figure 2 It is Figure 1 an exploded view of the brake module and the drive axle part in

[0070] Figure 3 It is Figure 2 a three-dimensional view of the pedal assembly and the foot brake pump part in

[0071] Figure 4 Yes Figure 2 Explosion diagram of the middle foot pedal assembly and the oil brake pump part;

[0072] Figure 5 Yes Figure 2 Explosion diagram of the middle foot pedal assembly;

[0073] Figure 6 Isometric view of the brake slave cylinder in the present invention;

[0074] Figure 7 Isometric view of the separation of the brake slave cylinder and the friction plate in the present invention;

[0075] Figure 8 Connection block diagram of the identification module and the control system in the present invention.

[0076] Meanings of the reference numerals in the figures:

[0077] 1. Frame; 2. User seat; 3. Left drive wheel; 4. Right drive wheel; 5. Left drive axle assembly; 6. Right drive axle assembly; 7. Mowing component; 8. Brake module; 801. Main pedal; 802. Sub-pedal; 803. Sub-pedal torsion spring; 804. Hook plate; 805. Hook plate torsion spring; 806. Limit rod; 807. Rotating plate; 808. Brake spring; 809. Fixed bracket; 810. Hydraulic pipe; 811. Foot brake pump; 812. Threaded push rod; 813. Oil pump bracket; 814. Bolt; 815. Damping compression spring; 816. Connecting plate; 817. Adjusting nut; 818. Micro switch; 819. Switch pressure plate; 820. Switch box; 821. Three-way valve block; 822. Brake slave cylinder; 8221. Slave cylinder hydraulic cylinder; 8222. Friction plate; 8223. Slave cylinder rod; 823. Brake disc; 824. Floating mounting bracket. [Specific implementation manner]

[0078] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For example, the terms indicating orientation or positional relationship such as "upper", "lower", "front", "rear", etc. are only based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device referred to must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention.

[0079] Unless otherwise specified, the terms "set", "connected" and "connected" in the present invention should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. The "fixed connection" in the present invention should also be understood in a broad sense as being integrally formed, welded or connected by other fasteners.

[0080] Please refer to Figures 1 to 8 which shows an outdoor garden working vehicle according to the first embodiment disclosed by the present invention, including: a frame 1, a left drive axle assembly 5, a right drive axle assembly 6, a mowing component 7, a power supply component, and a braking module.

[0081] The left drive axle assembly 5 is mechanically connected to the left drive motor and the left drive wheel 3 for transmitting the power of the left drive motor to the left drive wheel 3; the right drive axle assembly 6 is mechanically connected to the right drive motor and the right drive wheel 4 for transmitting the power of the right drive motor to the right drive wheel 4. The mowing component 7 is arranged below the frame 1 for cutting the vegetation on the ground; specifically, the left and right drive wheels 4 are located at the rear of the mowing component 7. It should be particularly noted that: the mowing component 7 should not be narrowly understood as a mechanism that can only mow grass, and it can also be replaced with other functional components, such as snow sweeping and snow blowing components, etc. Those skilled in the art should be able to adaptively replace various functional components without creative labor, and the above should all be included in the protection scope of this embodiment.

[0082] The power supply component is electrically connected to the left drive motor, the right drive motor, and the mowing component 7 for supplying power to the left drive motor, the right drive motor, and the mowing component 7. The power supply component selected in this embodiment is a battery pack; in other embodiments, a combination of an internal combustion engine and a storage battery can also be selected. In this form, the internal combustion engine burns fuel to charge the storage battery through a generator, and the storage battery then supplies power to each component of the lawn mower.

[0083] Refer to the attached Figure 2 In this embodiment, the braking module includes a brake parking component and a foot brake pump 811; the brake parking component includes a foot pedal component. The foot pedal component is hinged to the frame 1 and forms a lever with the foot brake pump 811. When the user steps on the foot pedal component, the foot brake pump 811 is triggered to generate a braking force on the left drive axle assembly 5 and the right drive axle assembly 6; in this embodiment, the foot pedal component and the foot brake pump 811 form a labor-saving lever, and the ratio of the input force arm to the output force arm of the labor-saving lever when the user steps on the foot pedal component is 1 - 20:1, which can make it relatively labor-saving for the user to step on the foot pedal component.

[0084] Refer to the attached Figure 2 In this embodiment, the braking module further includes: a hydraulic pipe 810, a left brake component, and a right brake component. The hydraulic pipe 810 connects the foot brake pump 811, the left brake component, and the right brake component. To effectively connect the above components, a three-way valve block 821 is generally provided; when the user steps on the foot pedal component, the foot brake pump 811 is triggered to generate a braking pressure, which acts on the left brake component and the right brake component through the hydraulic pipe 810 at the same time, generating a braking force on the left drive axle assembly 5 and the right drive axle assembly 6, so that the left drive wheel 3 and the right drive wheel 4 are braked; the magnitude of the stepping force for the user to step on the foot pedal component to achieve braking is 20N - 500N.

[0085] Furthermore, the pedaling force for the user to step on the pedal assembly to achieve braking is 30N - 200N. That is, different degrees of braking effects can be achieved within the range of 30N - 200N of pedaling force.

[0086] The left drive axle assembly 5 and the right drive axle assembly 6 are selected as reduction gearboxes of level 2 or above. The reduction gearbox includes an input shaft, an output shaft, and an intermediate shaft; the left brake assembly and the right brake assembly are respectively arranged on the non-output shafts of the corresponding reduction gearboxes. The braking power in this embodiment comes from the user's stepping. If the brake assembly is arranged on the output shaft (i.e., the drive wheel shaft), it will cause the brake to be too hard. At this time, a very large force is required to generate a certain braking force, making it difficult to effectively brake with the pedal. Therefore, generally, the brake assembly is not arranged on the output shaft.

[0087] In this embodiment, the left brake assembly and the right brake assembly are respectively arranged on the intermediate shafts of the corresponding reduction gearboxes, and there is a certain transmission ratio relationship among the input shaft, the intermediate shaft, and the output shaft. In other embodiments, the brake assembly can also be arranged on the input shaft, but this will cause the brake to be too sensitive, that is, slightly stepping on the pedal assembly can generate a large braking force and result in an emergency brake situation, making it impossible for the user to accurately grasp the stepping force when hoping to slow down slowly.

[0088] Since the drive axle assembly may select a multi-stage reduction gearbox, the reduction ratio range of the intermediate shaft of the left brake assembly or the right brake assembly to the corresponding output shaft is set to 1 - 50. In this embodiment, the left drive axle assembly 5 and the right drive axle assembly 6 select 2-level reduction gearboxes, and the reduction ratio range of the intermediate shaft of the left brake assembly or the right brake assembly to the corresponding output shaft is set to 3 - 6. Since the outdoor gardening operation vehicle in this embodiment is provided with a mowing component 7, which is mainly used to achieve lawn repair, the curb weight of common household gardening operation vehicles is about 200 Kg - 300 Kg, and the curb weight of commercial gardening operation vehicles is about 500 Kg - 800 Kg; after calculation, if the brake disc 823 is arranged on the output shaft, the braking torque needs to meet 150 Nm ≤ T, and this torque is relatively strenuous for ordinary users. In the case of selecting a 2-level reduction gearbox in this embodiment, the braking torque arranged on the intermediate shaft only needs to meet 30 Nm ≤ T ≤ 100 Nm, and the force is relatively reasonable and easy to step on and control.

[0089] It should be specifically noted that: in other embodiments, if the mowing component 7 is replaced with other heavy functional components, resulting in a significant increase in the vehicle's overall mass, in order to make the stepping on the pedal assembly relatively labor-saving, the brake assembly should be arranged on the input shaft at this time, or a reduction gearbox with a larger reduction ratio should be selected and the brake assembly should be arranged on the intermediate shaft close to the input shaft.

[0090] Both the left brake assembly and the right brake assembly include a brake slave cylinder 822 mounted on the corresponding drive axle assembly. The brake slave cylinder 822 includes a slave cylinder hydraulic cylinder 8221, a slave cylinder rod 8223, and a friction plate 8222. A brake disc 823 is fixedly connected to the shaft of the left brake assembly or the right brake assembly. When the user steps on the foot pedal assembly, the brake slave cylinder 822 presses the brake disc 823 to generate braking force. In this process, the foot brake pump 811 is connected to the slave cylinder hydraulic cylinder 8221 through a hydraulic pipe 810 and provides braking pressure. The slave cylinder rod 8223 moves relative to the slave cylinder hydraulic cylinder 8221 to drive the friction plate to move and press the brake disc 823 to form braking force.

[0091] Reference appendix Figures 6 to 7 , in this embodiment, the number of cylinders of the brake slave cylinder 822 is odd, that is, the brake assembly only has a slave cylinder hydraulic cylinder 8221 on one side of the brake disc 823. Generally, a single brake assembly only includes one slave cylinder hydraulic cylinder 8221 and one slave cylinder rod 8223, and the slave cylinder hydraulic cylinder 8221 is slidably mounted on the vehicle frame 1 or the corresponding reduction gearbox. The friction plate 8222 includes a dynamic friction plate and a static friction plate. The dynamic friction plate is fixed to the slave cylinder rod 8223 and is located on one side of the brake disc 823, and the static friction plate is arranged on the other side of the brake disc 823. When the foot brake pump 811 provides braking pressure to the slave cylinder hydraulic cylinder 8221, the slave cylinder rod 8223 pushes the dynamic friction plate and the static friction plate to press the brake disc 823. In this process, the dynamic friction plate first contacts the brake disc 823, and then the slave cylinder rod 8223 continues to move to drive the static friction plate to move towards the brake disc 823 until the two friction plates 8222 contact the brake disc 823 and generate braking force.

[0092] In other embodiments, the number of cylinders of the brake slave cylinder 822 is even, that is, the brake assembly only has slave cylinder hydraulic cylinders 8221 on both sides of the brake disc 823. Generally, a single brake assembly includes two slave cylinder hydraulic cylinders 8221 respectively located on both sides of the brake disc 823, and the two friction plates 8222 are fixed to the slave cylinder rod 8223 and are located on both sides of the brake disc 823. When the foot brake pump 811 provides braking pressure to the slave cylinder hydraulic cylinders 8221, the slave cylinder rod 8223 pushes the two dynamic friction plates to press the brake disc 823. It should be particularly noted that if the positions of the two slave cylinder hydraulic cylinders 8221 are fixed, it is necessary to accurately adjust the positions of the slave cylinder hydraulic cylinders 8221 so that the distances from the two friction plates 8222 to the brake disc 823 are always equal, otherwise there will be a problem that the friction plate 8222 on one side cannot effectively resist the brake disc 823, resulting in a poor deceleration effect. To solve this problem, generally, the slave cylinder hydraulic cylinders 8221 are slidably mounted on the vehicle frame 1 or the corresponding reduction gearbox. In this case, the problem of accurately adjusting the positions of the slave cylinder hydraulic cylinders 8221 can be avoided.

[0093] A floating mounting bracket 824 is fixed on the vehicle frame 1 or the corresponding reduction gearbox, and the slave cylinder hydraulic cylinder 8221 is slidably connected to the floating mounting bracket 824 to achieve the effect of floatingly mounting the slave cylinder hydraulic cylinder 8221 on the vehicle frame 1.

[0094] The thickness of the brake disc 823 is 2 mm to 6 mm, the diameter of the brake disc 823 is 60 mm to 300 mm, the hydraulic pressure range of the brake slave cylinder 822 is 2 Mpa to 40 Mpa, the piston stroke of the cylinder rod of the brake slave cylinder 822 is 0.5 mm to 20 mm, the cylinder rod diameter of the foot brake pump 811 is 5 mm to 30 mm, the diameter of the slave cylinder hydraulic cylinder 8221 is 5 mm to 40 mm, and the cylinder rod stroke of the foot brake pump 811 is 5 mm to 100 mm. The components with reasonable dimensions jointly achieve an effective braking effect.

[0095] Reference appendix Figures 3 to 4 The brake parking assembly further includes a rotating plate 807 and a brake spring 808. The rotating plate 807 is rotatably connected to the vehicle frame 1. The foot pedal assembly is fixedly connected to the rotating plate 807. The two ends of the brake spring 808 are respectively connected to the vehicle frame 1 and the rotating plate 807. A threaded push rod 812 is connected to the rotating plate 807. When the user steps on the foot pedal assembly, the rotating plate 807 rotates and pulls the brake spring 808, pushing the threaded push rod 812 to squeeze the foot brake pump 811 and generate a braking force. In this embodiment, the brake spring 808 is selected as a brake pull spring. When the user steps on the foot pedal assembly, the rotating plate 807 rotates and stretches the brake pull spring, and the brake pull spring provides a pulling force to give the pedal assembly part of the restoring power.

[0096] In other embodiments, the brake spring 808 can also be selected as a brake torsion spring or a brake compression spring. When the brake torsion spring is selected, one end of the brake torsion spring rotates synchronously when the user steps on the foot pedal assembly and the rotating plate 807 rotates; when the brake compression spring is selected, the rotating plate 807 rotates and compresses the brake compression spring when the user steps on the foot pedal assembly.

[0097] To facilitate the arrangement of the brake spring 808, the brake parking assembly of this embodiment further includes a fixed bracket 809 fixedly connected to the vehicle frame 1. The rotating plate 807 is rotatably connected to the fixed bracket 809. The two ends of the brake pull spring are respectively connected to the fixed bracket 809 and the rotating plate 807.

[0098] Reference appendix Figures 2 to 5, the foot pedal assembly includes a main pedal 801, a secondary pedal 802, a hook plate 804, and a hook plate torsion spring 805. A limiting rod 806 is fixedly connected to the vehicle frame 1; the hook plate 804 is rotatably connected to the main pedal 801. When the main pedal 801 is stepped on by the user, the hook plate 804 can be hooked on the limiting rod 806, causing the braking module to be in the parking state. The braking module in the parking state can continuously provide a large braking force. At this time, when the user releases the foot pedal assembly, the state of the braking module will not change, and the entire vehicle will also remain in place under the action of the braking force; the hook plate torsion spring 805 is arranged on the rotating shaft of the hook plate 804, and is used to generate an elastic force on the hook plate 804 to keep it hooked on the limiting rod 806 in the parking state, preventing the hook plate 804 from disengaging from the limiting rod 806 even due to slight vibrations; the maintaining force of the hook plate torsion spring 805 to maintain the contact between the hook plate 804 and the limiting rod 806 is 5N - 30N. In this embodiment, the maintaining force of the hook plate torsion spring 805 to maintain the contact between the hook plate 804 and the limiting rod 806 is 7N.

[0099] When the main pedal 801 moves under the user's stepping, at least one of the two surfaces where the hook plate 804 and the limiting rod 806 first come into contact is a curved surface, and when the user steps on the main pedal 801 to make the hook plate 804 abut against the limiting rod 806, the hook plate 804 can rotate until the inner side of the hook plate 804 bypasses the limiting rod 806 and is hooked on the limiting rod 806, thus realizing the parking action.

[0100] The secondary pedal 802 is movably connected to the main pedal 801. When the secondary pedal 802 is stepped on by the user, the hook plate 804 can be disengaged from the limiting rod 806. Specifically, when the secondary pedal 802 is stepped on by the user, it moves and presses the hook plate 804, causing the hook plate 804 to rotate away from the limiting rod 806 and disengage from the limiting rod 806. The maximum rotation angle of the hook plate 804 when the user steps on the secondary pedal 802 to drive the hook plate 804 from the state of being hooked on the limiting rod 806 to the state of disengaging from the limiting rod 806 is 5° - 30°.

[0101] In this embodiment, the secondary pedal 802 is rotatably connected to the main pedal 801, and the rotation angle range of the secondary pedal 802 when the user steps on it is 0 - 90°.

[0102] In other embodiments, the secondary pedal 802 can also be slidably arranged on the main pedal 801, as long as it can be stepped on to drive the hook plate 804 to rotate and disengage from the limiting rod 806; the specific setting method is not limited to the above rotational or sliding connection relationship.

[0103] In this embodiment, the main pedal 801 and the auxiliary pedal 802 can be stepped on simultaneously or separately with a single foot, that is, the auxiliary pedal 802 is close to the main pedal 801. Generally, the auxiliary pedal 802 is arranged on one side of the main pedal 801. An auxiliary pedal torsion spring 803 is arranged at the hinge joint between the auxiliary pedal 802 and the main pedal 801. The auxiliary pedal torsion spring 803 enables the auxiliary pedal 802 to maintain a state of not squeezing the hook plate 804 when not being stepped on, avoiding the situation that the vehicle hits the hook plate 804 when jolted by the outside or the user and the parking state is released. In this embodiment, the stepping force for the user to step on the auxiliary pedal 802 to disengage the hook plate 804 from the limiting rod 806 is 3N - 100N, and this stepping force is less than the force for stepping on the main pedal 801 to put the brake module 8 in the parking state.

[0104] Similar to the aforementioned brake spring 808, the hook plate torsion spring 805 and the auxiliary pedal torsion spring 803 in the present invention can also be replaced with a compression spring or a tension spring. Those skilled in the art can select the appropriate specific setting method according to the actual situation, which will not be elaborated here.

[0105] Refer to the appendix Figures 2 to 5 , in this embodiment, the auxiliary pedal 802 is arranged at the rear side of the main pedal 801, that is, when the user steps on it, the front sole acts on the main pedal 801 and the heel acts on the auxiliary pedal 802; because the user generally tends to exert more force with the front sole when stepping on, the stepping force of the main pedal 801 in this embodiment is greater than that of the auxiliary pedal 802, so this setting method is more in line with the user's habit.

[0106] Refer to the appendix Figure 8 , in this embodiment, the outdoor garden operation vehicle further includes an identification module, a control system, and a reminder module;

[0107] The identification module is used to detect whether the main pedal 801 is stepped on; the control system includes an overall machine control module, a motor control module, and a battery management module. The overall machine control module, the motor control module, and the battery management module are connected with each other by signals. The battery management module is signal-connected to the power supply component, and the motor control module is signal-connected to the drive motor; when the identification module detects that the main pedal 801 is stepped on, it controls the left drive motor and the right drive motor to stop rotating through the control system, that is, realizes the linkage between the drive motor and the brake module 8, avoiding the situation that the drive motor is still outputting power when braking, otherwise it will cause problems such as an increase in the braking distance, overheating or even dry burning of the brake disc 823, and overheating of the drive motor; and sends a braking state reminder to the user through the reminder module to remind the user that the current state is a braking state.

[0108] Refer to the appendix Figure 4, the recognition module in this embodiment includes a microswitch 818 disposed on the frame. A switch pressure plate 819 is fixed on the rotating plate 807. The switch pressure plate 819 presses the microswitch 818 when the main pedal 801 is in the natural release state. When the user steps on the main pedal 801 to drive the rotating plate 807 to rotate, the switch pressure plate 819 is separated from the microswitch 818. At this time, the microswitch 818 is triggered to control the left drive motor and the right drive motor to stop rotating. In this embodiment, as long as the user steps on the main pedal 801 to cause it to rotate, it will inevitably cause the switch pressure plate 819 to be separated from the microswitch 818, so that the recognition module is triggered to control the drive motor to stop rotating.

[0109] A switch box 820 is fixedly arranged on the fixed bracket 809. The microswitch 818 and the switch pressure plate 819 are both installed in the switch box 820. The switch box 820 provides a protective effect on the microswitch 818 and the switch pressure plate 819 to prevent external objects from contacting and generating false signals.

[0110] An oil brake force damping adjustment mechanism is provided at the foot brake pump 811, which is used to enable the foot pedal assembly to be continuously stepped on when the hydraulic oil in the foot brake pump 811 is compressed to the limit. When the hydraulic oil in the foot brake pump 811 is compressed to the limit, the friction plate 8222 of the brake caliper 822 has been tightly pressed against the brake disc 823, and the piston rod in the foot brake pump 811 cannot be further squeezed and move in the cylinder. If the damping adjustment mechanism is not provided, when the hydraulic oil is compressed to the limit, the foot pedal assembly cannot be continuously stepped on, that is, the user will feel that the foot pedal assembly is "extremely hard", resulting in a poor stepping experience for the user. When the damping adjustment mechanism is provided, after the hydraulic oil is compressed to the limit, continuous stepping will compress the damping adjustment mechanism, and the user can feel that the damping of stepping is getting larger and larger, but the damping force increases gradually and will not give the user an "extremely hard" foot feeling, improving the user experience.

[0111] The oil brake force damping adjustment mechanism includes an oil pump bracket 813 and a damping member. The damping member can generate elastic deformation when compressed. The oil pump bracket 813 is fixed to the vehicle frame 1, and the damping member is connected to the foot brake pump 811 and the oil pump bracket 813. After the hydraulic oil is compressed to the limit and the foot pedal assembly is continuously stepped on, the damping member deforms and applies a reverse elastic force to the foot brake pump 811.

[0112] The oil brake force damping adjustment mechanism further includes a guiding member connected to the foot brake pump 811. The guiding member is used to limit the foot brake pump 811 to reciprocate only in the direction of being squeezed by the foot pedal assembly. The function of the guiding member is to prevent the foot brake pump 811 from being skewed during movement, ensure that all components move in a predetermined direction, and avoid abnormal force conditions caused by skewing.

[0113] In this embodiment, the damping member is a damping compression spring 815, and the guiding member is a bolt 814. The bolt 814 sequentially passes through the foot brake pump 811 and the damping compression spring 815 and is threadedly connected to the oil pump bracket 813. The foot brake pump 811 and the bolt 814 are slidably sleeved on the bolt 814, and the bolt 814 limits the maximum distance between the foot brake pump 811 and the oil pump bracket 813. The damping compression spring 815 is arranged between the foot brake pump 811 and the oil pump bracket 813. When the extrusion force of the threaded push rod 812 on the foot brake pump 811 is greater than the elastic force of the damping spring, the damping spring is further compressed, and the foot brake pump 811 can move relative to the oil pump bracket 813.

[0114] After the damping member is assembled, it has an initial damping force, which is slightly less than the extrusion force of the threaded push rod 812 on the foot brake pump 811 when the vehicle is just fully braked (that is, when the hydraulic oil is not compressed at all). That is, in the stage from the start of stepping on the foot pedal assembly to the complete compression of the hydraulic oil, the damping member has begun to deform; and when the foot pedal assembly is continuously stepped on after the complete compression of the hydraulic oil, only the damping member continues to deform, and the reaction force given to the user's foot by this deformation increases linearly, so that the stepping force of the user from the start of stepping on the foot pedal assembly to the final inability to step on is always gradually increasing, and there will be no situation where the stepping force needs to increase sharply to continue stepping on the foot pedal assembly in a certain state, thereby further improving the user's foot feeling.

[0115] When the brake compression spring is in state 1 in the natural release state of the main pedal 801, and the damping compression spring 815 is in state 2 when the hook plate 804 is hooked on the limit rod 806. The compression amount of the damping compression spring 815 in state 2 is greater than that in state 1. The difference in the compression amount of the damping compression spring 815 between state 2 and state 1 is 1 mm to 60 mm. This difference in compression amount is the moving distance of the foot brake pump 811. The reasonable distance range is also for improving the user's foot feeling.

[0116] In other embodiments, the damping member can also be a torsion bar spring, an air spring, an oil-gas spring, a rubber spring, etc. The guiding function of the guiding member can also be realized by a guide rail or other limiting methods. The setting method is similar to the aforementioned brake spring, and those skilled in the art can perform simple adaptive assembly according to requirements to achieve the above effects.

[0117] An adjusting nut 817 is provided between the threaded push rod 812 and the rotating plate 807. The adjusting nut 817 is connected to the rotating plate 807, and the threaded push rod 812 is threadedly connected to the adjusting nut 817. One end of the threaded push rod 812 away from the adjusting nut 817 abuts against the piston rod of the foot brake pump 811. The threaded push rod 812 has a certain threaded portion, and when used in cooperation with the adjusting nut 817, the position of the threaded push rod 812 relative to the rotating plate 807 can be adjusted, reducing the dead stroke caused by mechanical cumulative error and significantly shortening the response time of the brake pump; referring to the accompanying drawings, in order to facilitate the installation of the adjusting nut 817, a connecting plate 816 is provided on the rotating plate 807 in this embodiment, and the adjusting nut 817 is rotatably connected to the connecting plate 816; rotating the adjusting nut 817 can adjust the length of the threaded push rod 812 screwed into the connecting plate 816, shortening the response time of the brake pump.

[0118] In the first embodiment of the present invention, the outdoor garden working vehicle further includes a user seat 2 connected to the vehicle frame 1 for the user to sit on rather than stand during driving, facilitating the user to release their feet and use them to step on the foot pedal assembly.

[0119] Further, in other embodiments, the outdoor garden working vehicle further includes a standing pedal connected to the vehicle frame 1 for the user to stand on during driving, providing a better view for the user at this time.

[0120] The present invention is not limited to the above specific embodiments. It can be easily understood by those of ordinary skill in the art that, without departing from the principles and scope of the present invention, there are many alternative solutions for the dust collection device of the present invention. The protection scope of the present invention is subject to the content of the claims.

Claims

1. An outdoor gardening operation vehicle, characterized in that, Comprising: Frame; Left drive axle assembly and right drive axle assembly. The left drive axle assembly is mechanically connected to the left drive motor and the left drive wheel, and is used to transmit the power of the left drive motor to the left drive wheel; the right drive axle assembly is mechanically connected to the right drive motor and the right drive wheel, and is used to transmit the power of the right drive motor to the right drive wheel; Mowing component, arranged at the lower part of the frame for cutting the vegetation on the ground; Power supply component, electrically connected to the left drive motor, the right drive motor and the mowing component, and used to supply power to the left drive motor, the right drive motor and the mowing component; Brake module, including: Brake parking assembly and foot brake pump; The brake parking assembly includes a foot pedal assembly, the foot pedal assembly is hinged to the frame and forms a lever with the foot brake pump, and when the user steps on the foot pedal assembly, the foot brake pump is triggered to generate braking force on the left drive axle assembly and the right drive axle assembly.

2. The outdoor garden operation vehicle according to claim 1, characterized in that: The foot pedal assembly and the foot brake pump form a force-saving lever, and when the user steps on the foot pedal assembly, the ratio of the input force arm to the output force arm of the force-saving lever is 1 to 20:

1.

3. An outdoor garden working vehicle according to claim 2, characterized in that: The brake module further includes: hydraulic pipe, left brake assembly, right brake assembly; When the user steps on the foot pedal assembly to trigger the foot brake pump to generate braking pressure and act on the left brake assembly and the right brake assembly through the hydraulic pipe at the same time, braking force is generated on the left drive axle assembly and the right drive axle assembly, so that the left drive wheel and the right drive wheel are braked; The stepping force for the user to step on the foot pedal assembly to achieve braking is 20N to 500N.

4. An outdoor garden operation vehicle according to claim 3, characterized in that: The stepping force for the user to step on the foot pedal assembly to achieve braking is 30N to 200N.

5. The outdoor garden operation vehicle according to claim 3, wherein: The left drive axle assembly and the right drive axle assembly select a reduction gearbox of grade 2 or above, and the reduction gearbox includes an input shaft, an output shaft and an intermediate shaft; The left brake assembly and the right brake assembly are respectively arranged on the non-output shafts of the corresponding reduction gearboxes.

6. The outdoor garden working vehicle according to claim 5, wherein: The left brake assembly and the right brake assembly are respectively arranged on the intermediate shafts of the corresponding reduction gearboxes.

7. An outdoor garden operation vehicle according to claim 6, characterized in that: The left brake assembly and the right brake assembly both include brake slave cylinders installed on the corresponding drive axle assemblies, and a brake disc is fixedly connected to the shaft where the left brake assembly or the right brake assembly is set; when the user steps on the foot pedal assembly, the brake slave cylinder squeezes the brake disc to generate braking force.

8. An outdoor garden operation vehicle according to claim 7, characterized in that: The brake slave cylinder includes a slave cylinder hydraulic cylinder, a slave cylinder rod and a friction plate. When the foot brake pump is connected to the slave cylinder hydraulic cylinder through a hydraulic pipe and provides braking pressure, the slave cylinder rod makes the friction plate squeeze the brake disc to form braking force.

9. An outdoor gardening work vehicle according to claim 8, characterized in that: The number of cylinders of the brake slave cylinder is odd, the slave cylinder hydraulic cylinder is slidably installed on the frame or the corresponding reduction gearbox, the friction plate includes a dynamic friction plate and a static friction plate, the dynamic friction plate is fixed to the slave cylinder rod and is located on one side of the brake disc, the static friction plate is arranged on the other side of the brake disc, and when the foot brake pump provides braking pressure to the slave cylinder hydraulic cylinder, the slave cylinder rod pushes the dynamic friction plate and the static friction plate to press the brake disc tightly.

10. An outdoor gardening work vehicle according to claim 9, characterized in that: A floating mounting bracket is fixed on the frame or the corresponding reduction gearbox, and the slave cylinder hydraulic cylinder is slidably connected to the floating mounting bracket.

11. An outdoor gardening work vehicle according to claim 8, characterized in that: The thickness of the brake disc is 2 mm to 6 mm, the diameter of the brake disc is 60 mm to 300 mm, the hydraulic pressure range of the brake caliper is 2 Mpa to 40 Mpa, the piston stroke of the cylinder rod of the caliper is 0.5 mm to 20 mm, the diameter of the cylinder rod of the foot brake pump is 5 mm to 30 mm, the diameter of the hydraulic cylinder of the caliper is 5 mm to 40 mm, and the stroke of the cylinder rod of the foot brake pump is 5 mm to 100 mm.

12. An outdoor gardening work vehicle according to claim 5, characterized in that: The left drive axle assembly and the right drive axle assembly select a two-stage reduction gearbox, and the reduction ratio of the intermediate shaft and the corresponding output shaft of the left brake assembly or the right brake assembly is set to 1 to 50.

13. The outdoor garden operation vehicle according to claim 2, characterized in that: The brake parking assembly further includes a rotating plate and a brake spring. The rotating plate is rotatably connected to the vehicle frame. The foot pedal assembly is fixedly connected to the rotating plate. The two ends of the brake spring are respectively connected to the vehicle frame and the rotating plate. A threaded push rod is connected to the rotating plate. When the user steps on the foot pedal assembly, the rotating plate rotates and pulls the brake spring, pushing the threaded push rod to squeeze the foot brake pump and generate a braking force.

14. An outdoor garden working vehicle according to claim 13, characterized in that: The foot pedal assembly includes a main pedal, a sub-pedal, a hook plate, and a hook plate torsion spring. A limiting rod is fixedly connected to the vehicle frame. The hook plate is rotatably connected to the main pedal. When the main pedal is stepped on by the user, the hook plate can be hooked on the limiting rod to make the braking module in the parking state. The hook plate torsion spring is arranged on the rotating shaft of the hook plate and is used to generate an elastic force on the hook plate to keep it hooked on the limiting rod in the parking state. The sub-pedal is movably connected to the main pedal. When the sub-pedal is stepped on by the user, the hook plate can be disengaged from the limiting rod.

15. An outdoor gardening operation vehicle according to claim 14, characterized in that: When the main pedal is stepped on by the user, at least one of the two surfaces where the hook plate and the limiting rod come into contact first is a curved surface, and when the user steps on the main pedal to make the hook plate abut against the limiting rod, the hook plate can rotate until the inner side of the hook plate bypasses the limiting rod and is hooked on the limiting rod. When the sub-pedal is stepped on by the user, it moves and squeezes the hook plate, causing the hook plate to rotate away from the limiting rod and disengage from the limiting rod. The sub-pedal is rotatably connected to the main pedal. The angle range for the user to step on the sub-pedal to rotate it is 0 to 90°. A sub-pedal torsion spring is arranged at the hinge joint between the sub-pedal and the main pedal. The sub-pedal torsion spring makes the sub-pedal maintain a state of not squeezing the hook plate when not stepped on. The stepping force for the user to step on the sub-pedal to disengage the hook plate from the limiting rod is 3 N to 100 N.

16. An outdoor garden working vehicle according to claim 1, characterized in that: An oil brake force damping adjustment mechanism is arranged at the foot brake pump, so that when the hydraulic oil in the foot brake pump is compressed to the limit, the foot pedal assembly can be stepped on continuously.

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