Plunger pump for vehicle hydraulic braking system

Abstract

The utility model discloses a plunger pump used for a vehicle hydraulic braking system, the plunger pump comprises a base body, a rotor and a pump core assembly, a liquid inlet and a liquid outlet are formed in the base body, the liquid inlet is used for being connected with a liquid storage tank, and the liquid outlet is used for being connected with a high-pressure energy accumulator; a rotor mounting hole communicated with the liquid inlet is formed in the center of the base body, and the rotor is arranged in the rotor mounting hole; a plurality of pump core assembly mounting holes communicated with the rotor mounting hole are annularly formed in the side face of the base body, and the pump core assemblies are inserted into the pump core assembly mounting holes; wherein the rotor rotates through an external motor and drives the pump core assembly to do reciprocating motion, so that liquid is conveyed to the high-pressure energy accumulator from the liquid storage tank; energy can be stored for conventional braking of the vehicle, so that the response time of a hydraulic braking system of the whole vehicle is shortened, braking force is increased, and the braking distance is reduced.

Description

Technical Field

[0001] This application relates to the technical field of plunger pumps, and particularly to a plunger pump for a vehicle hydraulic braking system. Background Art

[0002] A plunger pump is an important device in a hydraulic system. It relies on the reciprocating movement of a plunger body in a cylinder block to change the volume of a sealed working chamber to achieve oil suction and oil pressure. It has the advantages of high rated pressure, compact structure, high efficiency, and convenient flow regulation. Existing plunger pumps are mainly used in braking assistance systems such as ABS or ESC, mainly performing a liquid return function. Conventional braking mainly uses methods such as vacuum assistance or electric assistance to directly push the brake fluid into the brake, without reserve energy. In the face of heavy-duty vehicles, when using a hydraulic braking system, there are problems such as slow response, insufficient braking force, and long braking distance. Therefore, most heavy-duty vehicles currently use pneumatic braking, using an air compressor or an electric air pump to reserve energy. Therefore, there is an urgent need for a plunger pump that can reserve energy for a hydraulic braking system. Summary of the Utility Model

[0003] To solve the above problems, this application provides a plunger pump for a vehicle hydraulic braking system, which reserves energy for conventional vehicle braking, thereby shortening the response time of the vehicle's entire hydraulic braking system, increasing the braking force, and reducing the braking distance. The technical solution is as follows:

[0004] This application provides a plunger pump for a vehicle hydraulic braking system, including a base body, a rotor, and a pump core assembly. An inlet and an outlet are provided on the base body. The inlet is used to connect to a liquid storage tank, and the outlet is used to connect to a high-pressure accumulator. A rotor installation hole communicating with the inlet is provided at the center of the base body, and the rotor is installed in the rotor installation hole. A plurality of pump core assembly installation holes communicating with the rotor installation hole are annularly provided on the side of the base body, and the pump core assembly is inserted into the pump core assembly installation holes. Among them, the rotor is rotated by an external motor and drives the pump core assembly to reciprocate, so as to transport the liquid from the liquid storage tank to the high-pressure accumulator.

[0005] For example, in the plunger pump for a vehicle hydraulic brake system provided in one embodiment, the pump core assembly includes a spring assembly, a plunger assembly and a hollow nut, the spring assembly includes a return spring cover and a return spring fixed in the return spring cover; the plunger assembly is plugged into the spring assembly and communicated with the interior of the spring assembly, including a plunger sleeve and a plunger arranged in the plunger sleeve, and a through hole for liquid circulation is provided along the center line of the plunger; the hollow nut is connected to one end of the spring assembly facing away from the plunger assembly; wherein a liquid suction one-way valve is provided at the end of the plunger facing the spring assembly, and a liquid discharge one-way valve is provided on the side of the return spring cover close to the hollow nut, and liquid enters from the through hole and flows out from the liquid discharge one-way valve via the liquid suction one-way valve.

[0006] For example, in the plunger pump for a vehicle hydraulic brake system provided in one embodiment, a throttle valve is provided at the discharge port, and the liquid flowing out of the liquid outlet one-way valves of each pump core assembly is collected and discharged from the discharge port through the throttle valve.

[0007] For example, in the plunger pump for a vehicle hydraulic brake system provided in one embodiment, a return spring mounting groove and a steering circulation pipe that are connected are provided in the return spring cover, one end of the return spring cover is fixedly connected to the bottom of the return spring mounting groove, and the other end is a free end and extends into the plunger sleeve and is elastically connected to the plunger, a circulation hole for liquid outflow is provided at the bottom of the return spring mounting groove, the steering circulation pipe is connected to the circulation hole along the pipe mouth in the direction of the center line of the pump core assembly, and the steering circulation pipe is connected to the liquid outlet one-way valve along the pipe mouth in a direction perpendicular to the center line of the pump core assembly, the liquid enters the liquid suction one-way valve and flows out from the circulation hole, and enters the liquid outlet one-way valve and flows out after being diverted by the steering circulation pipe.

[0008] For example, in the plunger pump for a vehicle hydraulic brake system provided in one embodiment, the liquid suction one-way valve includes a liquid suction one-way valve housing, a liquid suction one-way valve spring cover, a liquid suction one-way valve spring and a liquid suction one-way valve steel ball, the liquid suction one-way valve housing is embedded in the end of the plunger facing the spring assembly and is connected to the through hole; the liquid suction one-way valve spring cover is interference-connected with the end of the liquid suction one-way valve housing close to the spring assembly; the liquid suction one-way valve spring is located in the liquid suction one-way valve spring cover, one end is fixedly connected to the inner wall of the liquid suction one-way valve spring cover, and the other end is a free end and extends into the liquid suction one-way valve housing; the liquid suction one-way valve steel ball is located in the liquid suction one-way valve housing and abuts against the free end of the liquid suction one-way valve spring.

[0009] For example, in the plunger pump for a vehicle hydraulic braking system provided in one embodiment, the outlet check valve includes an outlet check valve housing, an outlet check valve spring cover, an outlet check valve spring, and an outlet check valve steel ball. The outlet check valve housing is embedded in the return spring cover and communicates with the pipe orifice of the steering flow pipe in a direction perpendicular to the central axis of the pump core assembly. The outlet check valve spring cover is in interference fit with the outlet check valve housing. The outlet check valve spring is located inside the outlet check valve spring cover, with one end fixedly connected to the inner wall of the outlet check valve spring cover and the other end being a free end extending into the outlet check valve housing. The outlet check valve steel ball is located inside the outlet check valve housing and abuts against the free end of the outlet check valve spring.

[0010] For example, in the plunger pump for a vehicle hydraulic braking system provided in one embodiment, several eagle grooves are provided at intervals on the outer wall of the plunger.

[0011] For example, in the plunger pump for a vehicle hydraulic braking system provided in one embodiment, several "O" - rings are embedded on the outer wall of the return spring cover.

[0012] For example, in the plunger pump for a vehicle hydraulic braking system provided in one embodiment, an inlet connector is provided at the inlet, the inlet connector is connected to a liquid storage tank, and a sealing ring is provided at the connection between the inlet connector and the inlet.

[0013] For example, in the plunger pump for a vehicle hydraulic braking system provided in one embodiment, a limit and sealing assembly is provided at the end of the rotor. The limit and sealing assembly includes a limit ring, a coupling, and an oil seal. The oil seal is sleeved at the end of the rotor to achieve sealing, the limit ring is sleeved outside the oil seal to fix the oil seal, the end of the rotor is inserted into the coupling, and the coupling is used to connect the rotor to an external motor.

[0014] The beneficial effects brought by a plunger pump for a vehicle hydraulic braking system provided in some embodiments of the present application are as follows: In the present application, the rotor is connected to the external motor shaft. After starting the motor, the motor drives the rotor to rotate, synchronously pushing the plungers in each pump core assembly to reciprocate. The pump core assembly transports the brake fluid from the liquid storage tank into the high - pressure accumulator to reserve energy for the vehicle's conventional braking, thereby shortening the response time of the vehicle's hydraulic braking system, increasing the braking force, and reducing the braking distance. Description of the Drawings

[0015] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0016] Figure 1 It is the overall structure diagram of the plunger pump for the vehicle hydraulic braking system of this application;

[0017] Figure 2 It is the cross-sectional view of the pump core assembly of this application. Detailed implementation manners

[0018] The following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the drawings in the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, rather than all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by this application.

[0019] Unless otherwise defined, the technical terms or scientific terms used in this disclosure should have the ordinary meaning understood by those of ordinary skill in the art to which this disclosure belongs. The "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. "Connection" or "coupling" and similar terms are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to represent relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0020] This application provides a plunger pump for a vehicle hydraulic braking system, as Figure 1As shown, it includes a base body 100, a rotor 200 and a pump core assembly 300. An inlet 110 and an outlet 120 are provided on the base body 100. The inlet 110 is used to connect to a liquid storage tank, and the outlet 120 is used to connect to a high-pressure accumulator. A rotor mounting hole 130 communicating with the inlet 110 is provided at the center of the base body 100, and the rotor 200 is installed in the rotor mounting hole 130. A plurality of pump core assembly mounting holes 140 communicating with the rotor mounting hole 130 are annularly provided on the side of the base body 100, and the pump core assembly 300 is inserted into the pump core assembly mounting holes 140. Wherein, the rotor 200 is rotated by an external motor and drives the pump core assembly 300 to reciprocate, so as to transport liquid from the liquid storage tank to the high-pressure accumulator.

[0021] The plunger pump for a vehicle hydraulic braking system of the present application has the inlet 110 directly communicating with the rotor mounting hole 130. The rotor 200 is connected to an external motor shaft. After starting the motor, the motor drives the rotor 200 to rotate. Among them, the rotor 200 is an eccentric rotor. When the rotor 200 rotates, the rotor 200 is immersed in the brake fluid to obtain lubrication, and simultaneously pushes the plungers 322 in each pump core assembly 300 to reciprocate. The pump core assembly 300 transports the brake fluid from the liquid storage tank into the high-pressure accumulator to reserve energy for the vehicle's conventional braking, thereby shortening the response time of the vehicle's hydraulic braking system, increasing the braking force, and reducing the braking distance.

[0022] For example, in the plunger pump for a vehicle hydraulic braking system provided in an embodiment, as Figure 1 shown, 5 pump core assembly mounting holes 140 communicating with the rotor mounting hole 130 are annularly provided on the side of the base body 100, and 5 pump core assemblies 300 are installed in the base body 100 to achieve large-flow brake fluid transportation. The number of pump core assembly mounting holes 140 can be set to 2, 3, 4, 5 or 6 according to requirements. The present application does not limit the specific number of pump core assembly mounting holes 140.

[0023] For example, in the plunger pump for a vehicle hydraulic braking system provided in an embodiment, as Figure 2As shown, the pump core assembly 300 includes a spring assembly 310, a plunger assembly 320, and a hollow nut 330. The spring assembly 310 includes a return spring cover 311 and a return spring 312 fixedly arranged within the return spring cover 311. The plunger assembly 320 is inserted into the spring assembly 310 and is internally connected to the spring assembly 310. The plunger assembly 320 includes a plunger sleeve 321 and a plunger 322 arranged within the plunger sleeve 321. A through hole 323 for liquid flow is provided along the center line within the plunger 322. The hollow nut 330 is connected to one end of the spring assembly 310 facing away from the plunger assembly 320. Among them, a liquid suction check valve 340 is provided at the end of the plunger 322 facing the spring assembly 310, and a liquid discharge check valve 350 is provided on the side of the return spring cover 311 close to the hollow nut 330. Liquid enters from the through hole 323 and flows out from the liquid discharge check valve 350 via the liquid suction check valve 340.

[0024] According to the above embodiment, the present application realizes the one-way flow of the brake fluid and prevents the reverse flow of the brake fluid by providing a liquid suction check valve 340, a liquid discharge check valve 350, and a channel for the brake fluid to flow within the plunger 322.

[0025] When assembling the pump core assembly 300 into the base body 100, the end of the plunger 322 is inserted into the pump core assembly mounting hole 140, and the hollow nut 330 is exposed outside, and the assembly of the pump core assembly 300 is limited by the hollow nut 330.

[0026] For example, in the plunger pump for a vehicle hydraulic braking system provided in one embodiment, as Figure 1 shown, a throttle valve 121 is provided at the liquid discharge port 120, and the liquid flowing out from the liquid discharge check valves 350 of each pump core assembly 300 converges and is discharged from the liquid discharge port 120 via the throttle valve 121.

[0027] According to the above embodiment, by providing a throttle valve 121 at the liquid discharge port 120, the fluid flow rate of the plunger pump is controlled, the minimization of energy loss is achieved, the energy utilization rate of the plunger pump is improved, and by slowing down the fluid velocity, the influence of hydraulic shock is alleviated, the safe operation of the plunger pump is protected, the flow rates of each pump core assembly 300 are balanced, the flow rate of each pipeline is adjusted, so that the flow rates between different pipelines reach balance, and the overall efficiency and stability of the plunger pump are improved.

[0028] For example, in the plunger pump for a vehicle hydraulic braking system provided in one embodiment, as Figure 2As shown, a return spring installation groove 313 and a steering flow pipe 314 which are communicated with each other are arranged in the return spring cover 311. One end of the return spring cover 311 is fixedly connected to the bottom of the return spring installation groove 313, and the other end is a free end and extends into the plunger sleeve 321 to be elastically connected to the plunger 322. A flow hole 315 for liquid to flow out is arranged at the bottom of the return spring installation groove 313. The pipe orifice of the steering flow pipe 314 along the center line direction of the pump core assembly 300 is connected to the flow hole 315, and the pipe orifice of the steering flow pipe 314 along the direction perpendicular to the center line of the pump core assembly 300 is connected to the liquid outlet check valve 350. Liquid enters from the liquid suction check valve 340, flows out from the flow hole 315, is steered by the steering flow pipe 314, then enters the liquid outlet check valve 350 and flows out. According to the above embodiment, by arranging the steering flow pipe 314 between the liquid suction check valve 340 and the liquid outlet check valve 350, the steering of the liquid flow direction is realized.

[0029] For example, in the plunger pump for a vehicle hydraulic braking system provided in one embodiment, as Figure 2 shown, the liquid suction check valve 340 includes a liquid suction check valve housing 341, a liquid suction check valve spring cover 342, a liquid suction check valve spring 343 and a liquid suction check valve steel ball 3,44. The liquid suction check valve housing 341 is embedded in the end of the plunger 322 facing the spring assembly 310 and is communicated with the through hole 323; the liquid suction check valve spring cover 342 is in interference connection with the end of the liquid suction check valve housing 341 close to the spring assembly 310; the liquid suction check valve spring 343 is located in the liquid suction check valve spring cover 342, one end is fixedly connected to the inner wall of the liquid suction check valve spring cover 342, and the other end is a free end and extends into the liquid suction check valve housing 341; the liquid suction check valve steel ball 344 is located in the liquid suction check valve housing 341 and abuts against the free end of the liquid suction check valve spring 342.

[0030] For example, in the plunger pump for a vehicle hydraulic braking system provided in one embodiment, as Figure 2As shown, the liquid outlet check valve 350 includes a liquid outlet check valve housing 351, a liquid outlet check valve spring cover 352, a liquid outlet check valve spring 353 and a liquid outlet check valve steel ball 354. The liquid outlet check valve housing 351 is embedded in the return spring cover 352 and communicated with the pipe orifice of the steering flow pipe 314 in a direction perpendicular to the central line of the pump core assembly 300. The liquid outlet check valve spring cover 352 is in interference fit with the liquid outlet check valve housing 351. The liquid outlet check valve spring 353 is located in the liquid outlet check valve spring cover 352, one end of which is fixedly connected to the inner wall of the liquid outlet check valve spring cover 352, and the other end is a free end extending into the liquid outlet check valve housing 351. The liquid outlet check valve steel ball 354 is located in the liquid outlet check valve housing 351 and abuts against the free end of the liquid outlet check valve spring 352.

[0031] According to the above embodiment, the liquid suction check valve 340 of the present application is integrated on the plunger 322, and the liquid outlet check valve 350 is integrated in the return spring cover 352. The integrated design is convenient for installation. The inner ring of the liquid outlet check valve spring cover 352 is in interference fit with the liquid outlet check valve housing 351, and the outer ring of the liquid outlet check valve spring cover 352 is in interference fit with the return spring cover 352.

[0032] For example, in the plunger pump for a vehicle hydraulic braking system provided in an embodiment, as Figure 2 shown, several eagle grooves 3221 are provided at intervals on the outer wall of the plunger 322.

[0033] Among them, the plunger 322 and the plunger sleeve 321 are in small clearance fit. By providing the eagle grooves 3221 on the outer wall of the plunger 322, the pump efficiency is improved. The plunger assembly 320 of the present application has no other auxiliary parts such as rubber rings, is simple to assemble, and reduces wear.

[0034] For example, in the plunger pump for a vehicle hydraulic braking system provided in an embodiment, as Figure 2 shown, several "O" - rings 311 are embedded on the outer wall of the return spring cover 311.

[0035] According to the above embodiment, by embedding several "O" - rings 3111 on the outer wall of the return spring cover 311 for pressure isolation, when installing the pump core assembly 300, after using a tooling to press parts such as the return spring cover 311, the return spring 312, the plunger sleeve 321, and the plunger 322 to fixed positions, the hollow nut 330 is installed to prevent the hollow nut 330 from driving the pump core assembly 300 to rotate, causing the risk of dislocation or rupture of the "O" - ring 3111.

[0036] For example, in the plunger pump for a vehicle hydraulic braking system provided in an embodiment, as Figure 1As shown, a liquid inlet joint 111 is provided at the liquid inlet 110. The liquid inlet joint 111 is connected to a liquid storage tank, and a sealing ring 112 is provided at the connection between the liquid inlet joint 111 and the liquid inlet 110.

[0037] For example, in the plunger pump for a vehicle hydraulic braking system provided in one embodiment, as Figure 1 shown, a limiting and sealing assembly 210 is provided at the end of the rotor 200. The limiting and sealing assembly 210 includes a limiting ring 211, a coupling 212, and an oil seal 213. The oil seal 213 is sleeved at the end of the rotor 200 to achieve sealing, the limiting ring 211 is sleeved outside the oil seal 213 to fix the oil seal 213, the end of the rotor 200 is inserted into the coupling 212, and the coupling 212 is used to connect the rotor 200 to an external motor.

[0038] As Figure 1 shown, an exhaust assembly 150 is provided on the side of the base 100. The exhaust assembly 150 includes an exhaust hole 151, an exhaust screw 152, and a plug 153. When exhaust is required, the exhaust screw 152 is inserted into the exhaust hole 151. When exhaust is not needed, the plug 153 is inserted into the exhaust hole 151 for plugging.

[0039] Although the embodiments of the present application have been disclosed as above, they are not limited to only the applications listed in the description and embodiments. It can be fully applied to various fields suitable for the present application. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present application is not limited to the specific details and the illustrated examples here.

Claims

1. A plunger pump for a vehicle hydraulic braking system, characterized in that, include: A base body, on which a liquid inlet and a liquid outlet are provided, wherein the liquid inlet is used to be connected to the liquid storage tank, and the liquid outlet is used to be connected to the high-pressure accumulator; A rotor, wherein a rotor mounting hole communicating with the liquid inlet is provided at the center of the base, and the rotor is mounted in the rotor mounting hole; A pump core assembly, wherein a plurality of pump core assembly mounting holes communicating with the rotor mounting holes are provided on the side surface of the base, and the pump core assembly is inserted into the pump core assembly mounting holes; The rotor is rotated by an external motor and drives the pump core assembly to reciprocate to transport the liquid from the liquid storage tank to the high-pressure accumulator.

2. The plunger pump for a vehicle hydraulic braking system according to claim 1, characterized in that The pump core assembly includes: The spring assembly comprises a return spring cover and a return spring fixed in the return spring cover; A plunger assembly is plugged into the spring assembly and communicated with the interior of the spring assembly, comprising a plunger sleeve and a plunger disposed in the plunger sleeve, wherein a through hole for liquid circulation is provided along the center line of the plunger; a hollow nut connected to an end of the spring assembly facing away from the plunger assembly; Wherein, a liquid suction one-way valve is provided at the end of the plunger toward the spring assembly, and a liquid discharge one-way valve is provided on the side of the return spring cover close to the hollow nut. Liquid enters from the through hole and flows out from the liquid discharge one-way valve through the liquid suction one-way valve.

3. The plunger pump for a vehicle hydraulic braking system according to claim 2, characterized in that, A throttle valve is provided at the liquid discharge port, and the liquid flowing out of the liquid discharge one-way valves of each pump core assembly is collected and then discharged from the liquid discharge port through the throttle valve.

4. The plunger pump for a vehicle hydraulic braking system according to claim 2, characterized in that, A return spring mounting groove and a steering circulation pipe are provided in the return spring cover. One end of the return spring cover is fixedly connected to the bottom of the return spring mounting groove, and the other end is a free end and extends into the plunger sleeve and is elastically connected to the plunger. A circulation hole for liquid outflow is provided at the bottom of the return spring mounting groove. The steering circulation pipe is connected to the circulation hole at a pipe mouth along the center line direction of the pump core assembly. The steering circulation pipe is connected to the liquid outlet one-way valve along a pipe mouth perpendicular to the center line of the pump core assembly. The liquid enters the liquid suction one-way valve and flows out from the circulation hole. After being diverted by the steering circulation pipe, the liquid enters the liquid outlet one-way valve and flows out.

5. The plunger pump for a vehicle hydraulic braking system according to claim 2, characterized in that, The liquid suction one-way valve comprises: a liquid suction one-way valve housing, embedded in the end of the plunger facing the spring assembly and connected to the through hole; A liquid suction one-way valve spring cover is interference-connected with the end of the liquid suction one-way valve housing close to the spring assembly; A liquid suction check valve spring is located in the liquid suction check valve spring cover, one end of which is fixedly connected to the inner wall of the liquid suction check valve spring cover, and the other end of which is a free end and extends into the liquid suction check valve housing; The liquid suction one-way valve steel ball is located in the liquid suction one-way valve housing and abuts against the free end of the liquid suction one-way valve spring.

6. The plunger pump for a vehicle hydraulic braking system according to claim 4, characterized in that, The liquid outlet one-way valve comprises: A liquid outlet one-way valve housing is embedded in the return spring cover and communicates with the orifice of the steering flow pipe along a direction perpendicular to the center line of the pump core assembly; A liquid outlet one-way valve spring cover is interference-connected with the liquid outlet one-way valve housing; The liquid outlet check valve spring is located inside the liquid outlet check valve spring cover. One end is fixedly connected to the inner wall of the liquid outlet check valve spring cover, and the other end is a free end and extends into the liquid outlet check valve housing. The liquid outlet check valve steel ball is located inside the liquid outlet check valve housing and abuts against the free end of the liquid outlet check valve spring.

7. The plunger pump for a vehicle hydraulic braking system according to claim 2, characterized in that: Several eagle grooves are provided at intervals on the outer wall of the plunger.

8. The plunger pump for a vehicle hydraulic braking system according to claim 2, characterized in that: Several "O" - rings are embedded on the outer wall of the return spring cover.

9. The plunger pump for a vehicle hydraulic braking system according to claim 1, characterized in that: A liquid inlet joint is provided at the liquid inlet. The liquid inlet joint is connected to the liquid storage tank, and a sealing ring is provided at the connection between the liquid inlet joint and the liquid inlet.

10. The plunger pump for a vehicle hydraulic braking system according to claim 1, characterized in that: A limiting and sealing assembly is provided at the end of the rotor. The limiting and sealing assembly includes a limiting ring, a coupling and an oil seal. The oil seal is sleeved at the end of the rotor to achieve sealing. The limiting ring is sleeved outside the oil seal to fix the oil seal. The end of the rotor is inserted into the coupling, and the coupling is used to connect the rotor to an external motor.

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