Motor assembly, traveling drive system and work machine

Abstract

An embodiment of the present invention provides a motor assembly, a traveling drive system and a construction machine. The motor assembly includes: a motor, a brake, a brake control valve and a spool valve group. The brake control valve is connected to the brake. The brake is connected to the motor. The brake control valve can control the brake to release the braking action or form a braking action. The spool valve group is connected between the oil inlet circuit of the motor and the oil return circuit of the motor to control the connection or cut-off of the oil inlet circuit of the motor and the oil return circuit of the motor. When a failure occurs in the main machine of the construction machine, the motor assembly can release the braking action of the brake through an external oil source and connect the oil inlet circuit and the oil return circuit of the motor, so that the construction machine can be towed to a non-operation area. Thereby, the economic loss caused by the fact that the construction machine cannot be towed to a non-operation area due to a main machine failure can be greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic systems, and particularly to a motor assembly, a traveling drive system and a work machine. Background Art

[0002] For a traveling device operating on a tunnel or a railway subgrade, its braking measures are all bound to the transmission route. When the main machine fails and cannot move, the traveling device will stay at the operation site for a long time and cannot move. As a result, the next operation cannot be carried out, causing a large economic loss.

[0003] Therefore, there is an urgent need for an emergency towing solution that can tow the traveling device in case of a failure of the main machine. Summary of the Invention

[0004] The present invention provides a motor assembly, a traveling drive system and a work machine, which are used to solve the problem that the work machine in the prior art cannot move when the main machine fails, and achieve the effect of dragging the work machine away from the operation site through the control of an external oil source supply in case of a failure of the main machine.

[0005] According to a first aspect of the present invention, a motor assembly is provided, including: a motor, a brake, a brake control valve and a spool valve group.

[0006] Wherein, the brake control valve is connected to the brake. The brake is connected to the motor. The brake control valve can control the brake to release the braking action or form a braking action.

[0007] Wherein, the spool valve group is connected between the oil inlet circuit of the motor and the oil return circuit of the motor to control the connection or cut-off of the oil inlet circuit of the motor and the oil return circuit of the motor.

[0008] According to the motor assembly provided by the present invention, an oil drain tank and an oil drain control valve are further included.

[0009] Wherein, the oil drain control valve is connected between the oil drain tank and the oil drain port of the motor. The oil drain control valve can control the connection of the oil drain port of the motor with the oil drain tank or the connection of the oil drain port of the motor with the oil inlet circuit and the oil return circuit of the motor. And, oil replenishing check valves are installed between the oil drain control valve and the oil inlet circuit of the motor, and between the oil drain control valve and the oil return circuit of the motor.

[0010] According to the motor assembly provided by the present invention, the spool valve group includes a two-position four-way directional control valve and a three-position two-way directional control valve.

[0011] Among them, the oil inlet circuit of the motor and the oil return circuit of the motor are both connected to the two-position four-way directional control valve. The three-position two-way directional control valve is connected to the two-position four-way directional control valve to connect or cut off the oil inlet circuit of the motor and the oil return circuit of the motor.

[0012] According to a motor assembly provided by the present invention, the first working oil port of the two-position four-way directional control valve is connected to the oil inlet circuit of the motor. The second working oil port of the two-position four-way directional control valve is connected to the oil return circuit of the motor. The third working oil port of the two-position four-way directional control valve is connected to the first working oil port of the three-position two-way directional control valve. The fourth working oil port of the two-position four-way directional control valve is connected to the second working oil port of the three-position two-way directional control valve.

[0013] According to a motor assembly provided by the present invention, the three-position two-way directional control valve includes a first pilot control oil circuit and a second pilot control oil circuit. The first pilot control oil circuit is connected to the third working oil port of the two-position four-way directional control valve. The second pilot control oil circuit is connected to the fourth working oil port of the two-position four-way directional control valve.

[0014] Among them, return springs are installed at both ends of the spool of the three-position two-way directional control valve.

[0015] According to the second aspect of the present invention, a traveling drive system is provided, and the traveling drive system includes the motor assembly as described above.

[0016] According to a traveling drive system provided by the present invention, it further includes an oil source, an accumulator, an accumulator control valve, and a shuttle valve.

[0017] Among them, the oil source is connected to the first oil inlet of the shuttle valve. The oil source is connected to the accumulator to fill the accumulator with oil. The accumulator control valve is connected between the second oil inlet of the shuttle valve and the accumulator to connect or cut off the accumulator and the shuttle valve. The working oil port of the shuttle valve is connected to the brake control valve.

[0018] The oil source is connected to the oil inlet circuit and the oil return circuit of the motor. The pilot control oil circuit of the spool valve group is connected to the working oil port of the accumulator control valve. The spool valve group is connected between the oil inlet circuit and the oil return circuit of the motor to control the connection or cut-off of the oil inlet circuit and the oil return circuit of the motor.

[0019] According to a traveling drive system provided by the present invention, the accumulator control valve includes a two-position two-way electromagnetic directional control valve and a reversing switch. A power supply is included in the reversing switch so that the reversing switch can independently control the commutation of the two-position two-way electromagnetic directional control valve.

[0020] According to a walking drive system provided by the present invention, the oil source includes a first oil source, a second oil source, and a third oil source.

[0021] Among them, the first oil source is respectively connected to the first oil inlet of the shuttle valve and the accumulator. The second oil source is connected to the oil inlet circuit of the motor. The third oil source is connected to the oil return circuit of the motor.

[0022] According to a third aspect of the present invention, a work machine is provided, and the work machine includes the motor assembly or the walking drive system as described above.

[0023] In the motor assembly provided by the present invention, the brake control valve is connected to the brake. The brake is connected to the motor. The brake control valve can control the brake to release the braking action or form a braking action. The spool valve group is connected between the oil inlet circuit and the oil return circuit of the motor to control the connection or cut-off of the oil inlet circuit and the oil return circuit of the motor.

[0024] When a failure occurs in the work machine, an external oil source is used to control the brake control valve so that the brake releases the braking action on the motor. At the same time, an external oil source is used to control the action of the spool valve group so that the oil inlet circuit and the oil return circuit of the motor are connected to form a closed loop, and then the work machine can be towed to a non-working area.

[0025] According to the above description, it can be seen that when a failure occurs in the main machine of the work machine, the motor assembly can release the braking action of the brake through an external oil source and connect the oil inlet circuit and the oil return circuit of the motor, so that the work machine can be towed to a non-operation area. Thus, it can greatly reduce the economic losses caused by the work machine being unable to be towed to a non-operation area due to the failure of the main machine.

[0026] Furthermore, in the walking drive system provided by the present invention, since the walking drive system includes the motor assembly as described above, therefore, it also has the above-mentioned various advantages.

[0027] Moreover, in the work machine provided by the present invention, since the work machine includes the motor assembly or the walking drive system as described above, therefore, it also has the above-mentioned various advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0029] Figure 1 is the system schematic diagram of the walking drive system provided by the present invention;

[0030] Reference numerals:

[0031] 101: First oil source; 102: Second oil source;

[0032] 103: Third oil source; 201: Brake;

[0033] 202: Brake control valve; 301: Motor;

[0034] 302: Inlet oil circuit; 303: Return oil circuit;

[0035] 401: Accumulator; 402: Accumulator control valve;

[0036] 500: Shuttle valve; 601: Drain oil tank;

[0037] 602: Drain control valve; 603: Make-up oil check valve;

[0038] 701: Two-position four-way directional control valve; 702: Three-position two-way directional control valve;

[0039] 800: Check valve; 900: Motor assembly. Detailed implementation manners

[0040] The following further describes in detail the implementation manners of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0041] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0043] In the embodiments of the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0044] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0045] The following Figure 1 will describe a motor assembly 900, a traveling drive system, and a work machine provided by the embodiments of the present invention. It should be understood that the following description is only a schematic embodiment of the present invention and does not constitute any particular limitation to the present invention.

[0046] An embodiment of one aspect of the present invention provides a motor assembly 900, as Figure 1As shown, the motor assembly 900 includes: a motor 301, a brake 201, a brake control valve 202, and a spool valve group.

[0047] Among them, the brake control valve 202 is connected to the brake 201. The brake 201 is connected to the motor 301. The brake control valve 202 can control the brake 201 to release the braking action or form a braking action.

[0048] Among them, the spool valve group is connected between the oil inlet circuit 302 of the motor 301 and the oil return circuit 303 of the motor 301 to control the connection or cut-off of the oil inlet circuit 302 and the oil return circuit 303 of the motor 301.

[0049] When the working machine is in a stationary state, the brake piston in the brake 201 presses the brake pads under the action of the spring force. Thus, the power transmitted from the motor 301 to the speed reducer is braked. At this time, the working machine is in a braking state.

[0050] When the main machine of the working machine operates normally, the hydraulic oil inside the working machine can flow through the brake control valve 202 into the brake 201 to control the brake 201 to perform a braking action or release the braking action.

[0051] When the working machine fails, an external oil source can be used to control the brake control valve 202 to release the braking action of the brake 201 on the motor 301. At the same time, an external oil source is used to control the spool valve group to act, so that the oil inlet circuit 302 and the oil return circuit 303 of the motor 301 are connected and form a closed loop, and then the working machine can be towed to a non-working area.

[0052] According to the above description, it can be known that when the main machine of the working machine fails, the motor assembly 900 can use an external oil source to release the braking action of the brake 201 and connect the oil inlet circuit 302 and the oil return circuit 303 of the motor 301, so that the working machine can be towed to a non-working area. Thus, the economic losses caused by the inability to tow the working machine to a non-working area due to the main machine failure can be greatly reduced.

[0053] In an embodiment of the present invention, the motor assembly 900 further includes an oil drain tank 601 and an oil drain control valve 602.

[0054] Among them, the oil drain control valve 602 is connected between the oil drain tank 601 and the oil drain port of the motor 301. The oil drain control valve 602 can control the communication between the oil drain port of the motor 301 and the oil drain tank 601, or the communication between the oil drain port of the motor 301 and the oil inlet oil path 302 and the oil return oil path 303 of the motor 301. Moreover, oil replenishing check valves 603 are installed between the oil drain control valve 602 and the oil inlet oil path 302 of the motor 301, and between the oil drain control valve 602 and the oil return oil path 303 of the motor 301 respectively.

[0055] For example, as Figure 1 shown, in an embodiment of the present invention, the oil drain control valve 602 includes a two-position three-way directional valve. The first working oil port of the two-position three-way directional valve is connected to the oil drain port of the motor 301. The second working oil port of the two-position three-way directional valve is connected to the oil drain tank 601. The third working oil port of the two-position three-way directional valve is connected to the oil inlet oil path 302 and the oil return oil path 303 of the motor 301. The external oil source can be communicated with the pilot control oil path of the two-position three-way directional valve. The two-position three-way directional valve can be switched between the upper position and the lower position under the control action of the pilot control oil path connected to the external oil source.

[0056] As Figure 1 shown, in the initial state, the two-position three-way directional valve is in the lower position. At this time, the main engine of the working machine operates normally. The oil drain port of the motor 301 is communicated with the oil drain tank 601 through the two-position three-way directional valve. The hydraulic oil drained from the motor 301 flows into the oil drain tank 601.

[0057] When a fault occurs in the main engine of the working machine, the external oil source flows into the pilot control oil path of the two-position three-way directional valve, driving the two-position three-way directional valve to switch to the upper position. At this time, the hydraulic oil drained from the motor 301 can be replenished to the oil inlet oil path 302 of the motor 301 through the oil replenishing check valve 603, preventing the loss of the hydraulic oil drained from the motor 301.

[0058] According to the embodiments described above, when the main engine of the working machine operates normally, the oil source of the working machine continuously replenishes hydraulic oil to the motor 301, and the hydraulic oil drained from the motor 301 can be discharged into the oil drain tank 601. At this time, it will not cause damage to the motor 301 and the entire system.

[0059] When a fault occurs in the main engine of the working machine, there is no external oil source continuously replenishing oil to the motor 301. In this state, when the hydraulic oil drained from the motor 301 still discharges into the oil drain tank 601, when towing the working machine, it will cause cavitation phenomenon in the motor 301 and the entire system, and further damage the motor 301 and the entire traveling drive system.

[0060] In this traveling drive system, when a failure occurs in the main body of the working machine, the oil drain control valve 602 switches to the working position, so that the hydraulic oil drained from the motor 301 is supplied to the low-pressure side of the motor 301. Thus, the loss of hydraulic oil can be effectively prevented, and the cavitation phenomenon of the motor 301 and the entire system can be avoided.

[0061] In an embodiment of the present invention, the spool valve group includes a two-position four-way directional control valve 701 and a three-position two-way directional control valve 702.

[0062] Among them, the oil inlet circuit 302 of the motor 301 and the oil return circuit 303 of the motor 301 are both connected to the two-position four-way directional control valve 701. The three-position two-way directional control valve 702 is connected to the two-position four-way directional control valve 701 to communicate or cut off the oil inlet circuit 302 of the motor 301 and the oil return circuit 303 of the motor 301.

[0063] Furthermore, in an embodiment of the present invention, the first working oil port of the two-position four-way directional control valve 701 is connected to the oil inlet circuit 302 of the motor 301. The second working oil port of the two-position four-way directional control valve 701 is connected to the oil return circuit 303 of the motor 301. The third working oil port of the two-position four-way directional control valve 701 is connected to the first working oil port of the three-position two-way directional control valve 702. The fourth working oil port of the two-position four-way directional control valve 701 is connected to the second working oil port of the three-position two-way directional control valve 702.

[0064] Specifically, for example, as Figure 1 shown, in the two-position four-way directional control valve 701, the two working oil ports on the upper side of the two-position four-way directional control valve 701 are the first working oil port and the second working oil port from left to right; the two working oil ports on the lower side of the two-position four-way directional control valve 701 are the third working oil port and the fourth working oil port from left to right.

[0065] When the two-position four-way directional control valve 701 switches to the left position, the first working oil port is connected to the third working oil port and the oil inlet circuit 302 of the motor 301, and the second working oil port is connected to the fourth working oil port and the oil return circuit 303 of the motor 301. When the two-position four-way directional control valve 701 switches to the right position, the first working oil port, the second working oil port, the third working oil port, and the fourth working oil port are cut off from each other.

[0066] For example, as Figure 1 shown, in the three-position two-way directional control valve 702, the two working oil ports on the upper side of the three-position two-way directional control valve 702 are the first working oil port and the second working oil port respectively. The first working oil port of the three-position two-way directional control valve 702 is connected to the third working oil port of the two-position four-way directional control valve 701, and the second working oil port of the three-position two-way directional control valve 702 is connected to the fourth working oil port of the two-position four-way directional control valve 701.

[0067] When the three-position two-way directional control valve 702 is switched to the left position, the first working oil port and the second working oil port on it are connected to each other; when the three-position two-way directional control valve 702 is switched to the middle position, the first working oil port and the second working oil port on it are cut off from each other; when the three-position two-way directional control valve 702 is switched to the right position, the first working oil port and the second working oil port on it are connected to each other. It should be understood here that the left connected position and the right connected position of the three-position two-way directional control valve 702 are used for the forward and reverse rotations of the motor 301.

[0068] In an embodiment of the present invention, the three-position two-way directional control valve 702 includes a first pilot control oil circuit and a second pilot control oil circuit. The first pilot control oil circuit is connected to the third working oil port of the two-position four-way directional control valve 701. The second pilot control oil circuit is connected to the fourth working oil port of the two-position four-way directional control valve 701. Return springs are installed at both ends of the spool of the three-position two-way directional control valve 702.

[0069] Combined with the above embodiment, the first pilot control oil circuit of the three-position two-way directional control valve 702 is connected to the third working oil port of the two-position four-way directional control valve 701. The second pilot control oil circuit of the three-position two-way directional control valve 702 is connected to the fourth working oil port of the two-position four-way directional control valve 701.

[0070] Moreover, return springs are installed at both ends of the spool of the three-position two-way directional control valve 702. The return spring can generate a certain pre-tightening force on the spool. The opening and the opening amplitude of the spool of the three-position two-way directional control valve 702, that is, the magnitude of the displacement of the spool, depend on the hydraulic pressure in the first pilot control oil circuit or the second pilot control oil circuit and the pre-tightening force of the return spring.

[0071] The pressure in the first pilot control oil circuit or the second pilot control oil circuit can overcome the spring force of the return spring and drive the spool to move only after reaching a certain level. And as the pressure in the first pilot control oil circuit or the second pilot control oil circuit gradually increases, the diameter of the connecting oil circuit between the first working oil port and the second working oil port of the three-position two-way directional control valve 702 gradually increases.

[0072] When the diameter of the connecting oil circuit between the first working oil port and the second working oil port increases to a certain extent, the pressure acting on the spool through the first pilot control oil circuit or the second pilot control oil circuit will correspondingly decrease. Until the hydraulic pressure acting on the spool is in a certain equilibrium state, the spool is in a stable position.

[0073] At this time, the three-position two-way directional control valve 702 can generate a certain back pressure on the motor 301. Thus, when the hydraulic oil flows through the inside of the motor 301, an effective lubricating oil film with an appropriate strength can be established between the slipper and the swash plate of the motor 301. Furthermore, when the construction machine is towed, the problems of dry friction and sintering inside the motor 301 can be effectively prevented, the motor 301 is effectively protected, and the service life of the motor 301 is extended.

[0074] When the main engine of the construction machine is operating normally, the two-position four-way directional control valve 701 and the three-position two-way directional control valve 702 are in Figure 1 the state shown. That is, the two-position four-way directional control valve 701 is in the right position, and the three-position two-way directional control valve 702 is in the middle position.

[0075] When a failure occurs in the main engine of the construction machine, the external oil source flows into the pilot control oil circuit of the two-position four-way directional control valve 701 and drives the two-position four-way directional control valve 701 to switch to the left position.

[0076] The hydraulic oil in the third working oil port of the two-position four-way directional control valve 701 flows into the first pilot control oil circuit of the three-position two-way directional control valve 702, or the hydraulic oil in the fourth working oil port of the two-position four-way directional control valve 701 flows into the second pilot control oil circuit of the three-position two-way directional control valve 702, so as to drive the three-position two-way directional control valve 702 to switch to the left position or the right position, so that the first working oil port and the second working oil port in the three-position two-way directional control valve 702 are communicated. Thus, the oil inlet oil circuit 302 and the oil return oil circuit 303 of the motor 301 are communicated with each other and form a closed loop, and the construction machine can be towed to a non-working area.

[0077] At the same time, the three-position two-way directional control valve 702 can form a certain back pressure to establish an effective oil film with a certain strength between the slipper and the swash plate of the motor 301, thereby effectively protecting the motor 301.

[0078] An embodiment of the second aspect of the present invention provides a traveling drive system, and the traveling drive system includes the motor assembly 900 as described above.

[0079] Furthermore, since the traveling drive system includes the motor assembly 900 as described above, it also has the above-mentioned various advantages.

[0080] In an embodiment of the present invention, the traveling drive system further includes an oil source, an accumulator 401, an accumulator control valve 402, and a shuttle valve 500.

[0081] Among them, the oil source is connected to the first oil inlet of the shuttle valve 500. The oil source is connected to the accumulator 401 to fill the accumulator 401 with oil. The accumulator control valve 402 is connected between the second oil inlet of the shuttle valve 500 and the accumulator 401 to connect or cut off the accumulator 401 from the shuttle valve 500. The working oil port of the shuttle valve 500 is connected to the brake control valve 202.

[0082] The oil source is connected to the oil inlet oil path 302 of the motor 301 and the oil return oil path 303 of the motor 301. The pilot control oil path of the spool valve group is connected to the working oil port of the accumulator control valve 402. The spool valve group is connected between the oil inlet oil path 302 of the motor 301 and the oil return oil path 303 of the motor 301 to control the connection or cut-off of the oil inlet oil path 302 of the motor 301 and the oil return oil path 303 of the motor 301.

[0083] As Figure 1 shown, when the main machine of the construction machinery is running normally, the hydraulic oil can flow through the shuttle valve 500 and the brake control valve 202 to the brake 201.

[0084] When the main machine of the construction machinery is walking normally, the oil source can enter the brake 201 through the working oil port of the shuttle valve 500 and the brake control valve 202. The hydraulic oil acts on the brake piston in the brake 201, overcomes the pre-tightening force of the spring, and pushes the brake piston to slide to release the braking force. At the same time, the oil source can also provide an oil inlet source and an oil return oil path for the motor 301. The motor 301 rotates normally under the driving action of the hydraulic oil to drive the drive shaft to rotate, thereby driving the construction machinery to travel normally.

[0085] In addition, during the normal walking process of the construction machinery, the oil source can also store part of the oil in the accumulator 401 for use as a backup oil source when the main machine of the construction machinery fails.

[0086] When the main machine of the construction machinery fails, the oil source is in a cut-off state. Part of the hydraulic oil in the accumulator 401 flows through the accumulator control valve 402, the shuttle valve 500 and the brake control valve 202 and into the brake 201. The hydraulic oil acts on the brake piston in the brake 201, overcomes the pre-tightening force of the spring, and pushes the brake piston to slide to release the braking force. At the same time, part of the hydraulic oil in the accumulator 401 flows through the working oil port of the accumulator control valve 402 into the spool valve group to connect the oil inlet oil path 302 and the oil return oil path 303 of the motor 301 and form a closed loop. At this time, the construction machinery can be towed to a non-working area.

[0087] With this structural arrangement, when the main machine of the construction machinery is working normally, the oil source can store oil for the accumulator 401. The oil source can provide an oil inlet source and an oil return oil path for the motor 301. The motor 301 works normally under the driving action of the hydraulic oil.

[0088] When a failure occurs in the main body of the working machine, the oil source is cut off. At this time, the oil in the accumulator 401 can still flow through the accumulator control valve 402 and the shuttle valve 500 into the brake control valve 202 and the brake 201 to release the brake on the motor 301.

[0089] The oil stored in the accumulator 401 flows through the working oil port of the accumulator control valve 402 into the pilot control oil circuit of the spool valve group, prompting the spool valve group to change direction so that the oil inlet circuit 302 of the motor 301 and the oil return circuit 303 of the motor 301 are connected to form a closed loop.

[0090] According to the above description, on the one hand, this traveling drive system can ensure the normal operation and driving of the working machine; on the other hand, it can also tow the working machine to a non-operating area when a failure occurs in the main machine. Thus, it can greatly reduce the economic losses caused by the inability to tow the working machine to a non-operating area due to a main machine failure.

[0091] In an embodiment of the present invention, the accumulator control valve 402 includes a two-position two-way electromagnetic directional valve and a reversing switch. The reversing switch includes a power source inside to enable the reversing switch to independently control the direction change of the two-position two-way electromagnetic directional valve.

[0092] As Figure 1 shown, the accumulator control valve 402 includes a two-position two-way electromagnetic directional valve and a reversing switch for controlling the switching of the working position of the two-position two-way electromagnetic directional valve. Among them, a power source is installed inside the reversing switch. This power source can be a battery. As long as the battery inside the reversing switch is powered, the switching of the working position of the two-position two-way electromagnetic directional valve can be controlled.

[0093] When the main body of the working machine is running normally, the two-position two-way electromagnetic directional valve is in the Figure 1 left position shown, that is, the state where the accumulator 401 and the oil inlet of the shuttle valve 500 are mutually cut off. At this time, the accumulator 401 only stores energy and does not supply energy.

[0094] When a failure occurs in the main body of the working machine, control the reversing switch to drive the two-position two-way electromagnetic directional valve to switch to the right position, that is, the state where the accumulator 401 and the oil inlet of the shuttle valve 500 are mutually connected. At this time, the first oil source 101 is cut off. The accumulator 401 stops storing energy and starts supplying energy.

[0095] In an embodiment of the present invention, the oil source includes a first oil source 101, a second oil source 102, and a third oil source 103.

[0096] Among them, the first oil source 101 is respectively connected to the first oil inlet of the shuttle valve 500 and the accumulator 401. The second oil source 102 is connected to the oil inlet circuit 302 of the motor 301. The third oil source 103 is connected to the oil return circuit 303 of the motor 301.

[0097] It should be understood here that the first oil source 101, the second oil source 102, and the third oil source 103 can be three independent oil sources respectively, or three branches of a common oil source.

[0098] As Figure 1 shown, the first oil source 101 is respectively connected to the first oil inlet of the shuttle valve 500 and the accumulator 401. Thus, part of the hydraulic oil of the first oil source 101 can flow into the brake control valve 202 through the shuttle valve 500 to control the brake 201 to perform a braking action or release the braking action. At the same time, part of the hydraulic oil of the first oil source 101 can also be stored in the accumulator 401 as a standby oil source.

[0099] The second oil source 102 is connected to the oil inlet circuit 302 of the motor 301, and the third oil source 103 is connected to the oil return circuit 303 of the motor 301. It should be understood here that since the motor 301 can rotate forward or backward. The above connection of the second oil source 102 to the oil inlet circuit 302 of the motor 301 and the connection of the third oil source 103 to the oil return circuit 303 of the motor 301 are only an exemplary embodiment of the present invention. It cannot constitute any limitation to the present invention. The oil inlet circuit 302 and the oil return circuit 303 of the motor 301 can be used interchangeably. That is, the oil inlet circuit 302 when the motor 301 rotates forward is the oil return circuit 303 when the motor 301 rotates backward; the oil return circuit 303 when the motor 301 rotates forward is the oil inlet circuit 302 when the motor 301 rotates backward.

[0100] Furthermore, in an embodiment of the present invention, a one-way valve 800 for preventing oil backflow is provided between the first oil source 101 and the accumulator 401.

[0101] As Figure 1 shown, a one-way valve 800 is installed between the first oil source 101 and the accumulator 401, and the one-way valve 800 can prevent the hydraulic oil in the accumulator 401 from flowing back into the first oil source 101.

[0102] An embodiment of the third aspect of the present invention provides a working machine, and the working machine includes the motor assembly 900 or the traveling drive system as described above.

[0103] For example, in an embodiment of the present invention, the above working machine includes a crawler traveling mechanism or a wheeled traveling mechanism.

[0104] It should be understood here that the above embodiments are only illustrative embodiments of the present invention and do not constitute any limitation to the present invention. That is to say, the above construction machinery includes but is not limited to a crawler traveling mechanism and a wheeled traveling mechanism.

[0105] Furthermore, since the construction machinery includes the motor assembly 900 or the traveling drive system as described above, therefore, it also has the various advantages as described above.

[0106] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A motor assembly, characterized in that, Comprising: A motor, a brake, a brake control valve, and a spool valve group. Wherein, the brake control valve is connected to the brake, the brake is connected to the motor, and the brake control valve can control the brake to release the braking action or form a braking action. Wherein, the spool valve group is connected between the oil inlet circuit and the oil return circuit of the motor to control the connection or cut-off of the oil inlet circuit and the oil return circuit of the motor. The spool valve group includes a two-position four-way directional control valve and a three-position two-way directional control valve. Wherein, both the oil inlet circuit and the oil return circuit of the motor are connected to the two-position four-way directional control valve, and the three-position two-way directional control valve is connected to the two-position four-way directional control valve to enable the connection or cut-off of the oil inlet circuit and the oil return circuit of the motor. The first working oil port of the two-position four-way directional control valve is connected to the oil inlet circuit of the motor, the second working oil port of the two-position four-way directional control valve is connected to the oil return circuit of the motor, the third working oil port of the two-position four-way directional control valve is connected to the first working oil port of the three-position two-way directional control valve, and the fourth working oil port of the two-position four-way directional control valve is connected to the second working oil port of the three-position two-way directional control valve. When the working machine is in a stationary state, the brake piston in the brake presses the brake pads under the action of the spring force, and the power transmitted from the motor to the reducer is braked, and the working machine is in a braking state; when the main engine of the working machine is running normally, the hydraulic oil inside the working machine can flow through the brake control valve to the brake to control the brake to perform a braking action or release the braking action; when the working machine fails, an external oil source is used to control the brake control valve to release the braking action of the brake on the motor. At the same time, an external oil source is used to control the action of the spool valve group to connect the oil inlet circuit and the oil return circuit of the motor and form a closed loop to tow the working machine to a non-working area.

2. The motor assembly according to claim 1, wherein It further includes an oil drain tank and an oil drain control valve. Wherein, the oil drain control valve is connected between the oil drain tank and the oil drain port of the motor, and the oil drain control valve can control the connection of the oil drain port of the motor with the oil drain tank or the connection with the oil inlet circuit and the oil return circuit of the motor. And, oil replenishing check valves are installed between the oil drain control valve and the oil inlet circuit of the motor, and between the oil drain control valve and the oil return circuit of the motor.

3. The motor assembly according to claim 1, characterized in that, The three-position two-way directional control valve includes a first pilot control oil circuit and a second pilot control oil circuit. The first pilot control oil circuit is connected to the third working oil port of the two-position four-way directional control valve, and the second pilot control oil circuit is connected to the fourth working oil port of the two-position four-way directional control valve. Wherein, return springs are installed at both ends of the spool of the three-position two-way directional control valve.

4. A walking drive system, characterized in that, The traveling drive system includes a motor assembly according to any one of claims 1 to 3.

5. The walking drive system according to claim 4, wherein, It further includes an oil source, an accumulator, an accumulator control valve, and a shuttle valve. Wherein, the oil source is connected to the first oil inlet of the shuttle valve, and the oil source is connected to the accumulator to fill the accumulator with oil. The accumulator control valve is connected between the second oil inlet of the shuttle valve and the accumulator to connect or cut off the accumulator from the shuttle valve. The working oil port of the shuttle valve is connected to the brake control valve. The oil source is connected to the oil inlet circuit and the oil return circuit of the motor. The pilot control oil circuit of the spool valve group is connected to the working oil port of the accumulator control valve. The spool valve group is connected between the oil inlet circuit and the oil return circuit of the motor to control the connection or cut-off of the oil inlet circuit and the oil return circuit of the motor.

6. The walking drive system according to claim 5, wherein, The accumulator control valve includes a two-position two-way electromagnetic reversing valve and a reversing switch. The reversing switch includes a power supply inside to enable the reversing switch to independently control the commutation of the two-position two-way electromagnetic reversing valve.

7. The walking drive system according to claim 5, characterized in that, The oil source includes a first oil source, a second oil source, and a third oil source. Wherein, the first oil source is respectively connected to the first oil inlet of the shuttle valve and the accumulator, the second oil source is connected to the oil inlet circuit of the motor, and the third oil source is connected to the oil return circuit of the motor.

8. An operating machine, characterized in that, It includes the motor assembly according to any one of claims 1 to 3 or the traveling drive system according to any one of claims 4 to 7.

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