A reciprocating hydraulic motor

Abstract

This invention belongs to the field of hydraulic motor technology, and more particularly to a reciprocating hydraulic motor, comprising two inlet hoses, one outlet hose, and a sliding block. The outlet hose is located between the two inlet hoses. The sliding block has three channels. The top ends of the two inlet hoses and the one outlet hose are sequentially and fixedly connected to the channels of the sliding block. Inlet check valves are installed in the channels on both the left and right sides of the sliding block, and an outlet check valve is installed in the channel in the middle of the sliding block. A limit plate is slidably connected to the inner front end of the sliding block. A first rigid tube is fixedly installed on the inner left end of the limit plate. The motor has a square structure instead of a circular outline, which makes the conversion of liquid pressure into mechanical power more direct, thereby achieving better conversion efficiency. It has greater torque in the same volume, and the motor of this invention has fewer wear parts, thus reducing the failure rate.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic motor technology, and specifically relates to a reciprocating hydraulic motor. Background Technology

[0002] Traditional hydraulic motors are classified into vane type, gear type, and cycloidal type. These motors do not directly convert liquid pressure into mechanical power output, resulting in many wear-prone parts. Most traditional hydraulic motors have a circular outline, and hydraulic motors with larger torque are generally larger in size. This is because traditional hydraulic motors do not directly convert liquid pressure into mechanical power output. If a larger torque is required, it is generally obtained by increasing the size. Summary of the Invention

[0003] To address the problems mentioned in the background section, this invention provides a reciprocating hydraulic motor that more directly converts liquid pressure into mechanical power, thereby achieving better conversion efficiency and greater torque within the same volume.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a reciprocating hydraulic motor, comprising two inlet hoses, one outlet hose, and a sliding block. The outlet hose is located between the two inlet hoses. The sliding block has three channels. The top ends of the two inlet hoses and the one outlet hose are sequentially and fixedly connected to the channels of the sliding block. Inlet check valves are installed in the channels on both the left and right sides of the sliding block, and outlet check valves are installed in the channel in the middle of the sliding block. A limiting plate is slidably connected to the inner front end of the sliding block. A first rigid tube is fixedly installed on the inner left end of the limiting plate, and a second rigid tube is fixedly installed on the inner right end of the limiting plate. The lower ends of the first and second rigid tubes can simultaneously connect to any two adjacent channels of the sliding block. When the lower ends of the first and second rigid tubes are simultaneously connected to any two adjacent channels of the sliding block, the limiting plate can simultaneously cover all three channels of the sliding block.

[0005] As a preferred embodiment of the reciprocating hydraulic motor of the present invention, the sliding block can move continuously left and right, thereby constantly switching the connection relationship between the first rigid tube, the second rigid tube and the three channels inside the sliding block.

[0006] As a preferred embodiment of the reciprocating hydraulic motor of the present invention, the hydraulic motor further includes a cylinder body, wherein pistons are slidably connected to the inner sides of both the left and right ends of the cylinder body, and connecting rods are fixedly connected to the bottom ends of the pistons, and the two pistons and connecting rods on the left and right sides can reciprocate alternately.

[0007] As a preferred embodiment of the reciprocating hydraulic motor of the present invention, a rotating shaft is fixedly connected to the inner sides of both the left and right ends of the sliding block, and a sector block is rotatably connected to the outer side of the rotating shaft. The two sector blocks are respectively rotatably installed on the inner sides of the left and right ends of the sliding block through the rotating shaft. The inner side of the rotating shaft is fixedly connected to one end of a torsion spring, and the other end of the torsion spring is fixedly connected to the outer side of one end of the sector block.

[0008] As a preferred reciprocating hydraulic motor of the present invention, the connecting rod that is moving downward can contact the sector block on the adjacent side and can press the sector block on the adjacent side towards the inside of the sliding block.

[0009] In a preferred embodiment of the reciprocating hydraulic motor of the present invention, a second limiting strip is slidably connected to the inner sides of both the upper and lower ends of the sliding block, a limiting bracket is fixedly connected to the outer side of one end of the second limiting strip, a limiting hole is opened on the inner sides of both the upper and lower ends of the sliding block, an arc-shaped limiting rod is slidably connected to the inner side of one end of the limiting bracket, the hemispherical part of the arc-shaped limiting rod can cooperate with the limiting hole, a spring plate is fixedly connected to the planar part of the arc-shaped limiting rod, the outer surfaces of the spring plate are slidably connected to the inner side of one end of the limiting bracket, and a compression spring is fixedly connected between the outer side of one end of the spring plate and the inner side of one end of the limiting bracket.

[0010] As a preferred embodiment of the reciprocating hydraulic motor of the present invention, a first rack is embedded and fixed inside one of the adjacent ends of the two connecting rods, and both first racks can mesh with an intermediate gear. The central position of the intermediate gear is rotatably connected to the shaft support via a rotating shaft.

[0011] In a preferred embodiment of the reciprocating hydraulic motor of the present invention, a second rack is fixedly connected to the outer rear end of each of the two connecting rods. The two second racks are respectively meshed with two working gears. The two working gears are rotatably connected to the output shaft through a one-way bearing. When the two connecting rods move upward, the working gears and the output shaft will rotate freely.

[0012] As a preferred embodiment of the reciprocating hydraulic motor of the present invention, the upper and lower ends of the limiting plate are fixedly connected with first limiting strips, and the inner side of the top of the sliding block is provided with a strip groove that can cooperate with the first limiting strips.

[0013] In a preferred embodiment of the reciprocating hydraulic motor of the present invention, the cylinder body, the rotating shaft bracket and the limiting bracket are all fixedly installed inside the outer casing, the outer side of the output shaft is rotatably installed on the inner side of one end of the outer casing via a bearing, and the first rigid tube and the second rigid tube are both fixedly installed inside the outer casing via pipe clamps.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the structure has a square shape instead of a circular outline, which makes the way of converting liquid pressure into mechanical power more direct, thereby achieving better conversion efficiency; it has greater torque in the same volume; and the motor of the present invention has fewer wear parts, thereby reducing the failure rate. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0016] Figure 1 This is a first-view sectional view of the overall structure of the present invention;

[0017] Figure 2 In this invention Figure 1 An enlarged structural diagram at point A;

[0018] Figure 3 This is a second-view sectional view of the overall structure of the present invention;

[0019] Figure 4 In this invention Figure 3 A magnified structural diagram at point B;

[0020] Figure 5 This is a cross-sectional view of the sliding block in this invention;

[0021] Figure 6 In this invention Figure 5 A magnified structural diagram at point C;

[0022] Figure 7 This is a schematic diagram of one possible mating structure between the sliding block and the limiting plate in this invention;

[0023] Figure 8 This is a schematic diagram of another possible cooperation structure between the sliding block and the limiting plate in this invention;

[0024] Figure 9 This is a three-dimensional diagram of the cooperative structure of the sliding block and the limiting plate in this invention;

[0025] Figure 10 This is a schematic diagram of the connection structure of the two hydraulic motors in this invention;

[0026] In the picture:

[0027] 101. Oil inlet hose; 102. Oil outlet hose;

[0028] 201. Sliding block; 202. Inlet check valve; 203. Outlet check valve; 204. Strip groove; 205. Limiting hole;

[0029] 301. First rigid tube; 302. Second rigid tube; 303. Limiting plate; 304. First limiting strip;

[0030] 401. Cylinder block; 402. Piston; 403. Connecting rod;

[0031] 501. Limiting bracket; 502. Second limiting strip; 503. Arc-shaped head limiting rod; 504. Spring plate; 505. Compression spring; 506. Sector block; 507. Torsion spring;

[0032] 601. Shaft support; 602. Intermediate gear;

[0033] 701. Power gear; 702. Output shaft;

[0034] 801. Outer shell. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] like Figures 1-10 As shown:

[0037] A reciprocating hydraulic motor includes two inlet hoses 101, one outlet hose 102, and a sliding block 201. The outlet hose 102 is located between the two inlet hoses 101. The sliding block 201 has three channels. The top ends of the two inlet hoses 101 and the outlet hose 102 are sequentially and fixedly connected to the channels of the sliding block 201. Inlet check valves 202 are installed in the channels on both the left and right sides of the sliding block 201, and an outlet check valve 203 is installed in the middle channel of the sliding block 201. The front end of the sliding block 201... The side sliding connection has a limiting plate 303. A first rigid tube 301 is fixedly installed on the inner side of the left end of the limiting plate 303, and a second rigid tube 302 is fixedly installed on the inner side of the right end of the limiting plate 303. The lower ends of the first rigid tube 301 and the second rigid tube 302 can simultaneously communicate with any two adjacent channels of the sliding block 201. When the lower ends of the first rigid tube 301 and the second rigid tube 302 are simultaneously connected with any two adjacent channels of the sliding block 201, the limiting plate 303 can simultaneously cover the three channels of the sliding block 201.

[0038] Furthermore;

[0039] In an optional embodiment, the sliding block 201 can move continuously back and forth, thereby constantly switching the connection relationship between the first rigid tube 301, the second rigid tube 302 and the three channels inside the sliding block 201.

[0040] In an optional embodiment, the hydraulic motor further includes a cylinder 401, with pistons 402 slidably connected to the inner sides of both the left and right ends of the cylinder 401, and connecting rods 403 fixedly connected to the bottom ends of the pistons 402. The two pistons 402 and the connecting rods 403 on the left and right sides can reciprocate alternately.

[0041] In an optional embodiment, a rotating shaft is fixedly connected to the inner sides of both the left and right ends of the sliding block 201, and a sector block 506 is rotatably connected to the outer side of the rotating shaft. The two sector blocks 506 are respectively rotatably installed on the inner sides of the left and right ends of the sliding block 201 through the rotating shaft. The inner side of the rotating shaft is fixedly connected to one end of the torsion spring 507, and the other end of the torsion spring 507 is fixedly connected to the outer side of one end of the sector block 506.

[0042] In an optional embodiment, the downward-moving connecting rod 403 can contact the adjacent sector block 506 and press the adjacent sector block 506 toward the inside of the sliding block 201.

[0043] In an optional embodiment, a second limiting strip 502 is slidably connected to the inner sides of both the upper and lower ends of the sliding block 201. A limiting bracket 501 is fixedly connected to the outer side of one end of the second limiting strip 502. Limiting holes 205 are opened on the inner sides of both the upper and lower ends of the sliding block 201. An arc-shaped limiting rod 503 is slidably connected to the inner side of one end of the limiting bracket 501. The hemispherical part of the arc-shaped limiting rod 503 can cooperate with the limiting hole 205. A spring plate 504 is fixedly connected to the planar part of the arc-shaped limiting rod 503. The outer surfaces of the spring plate 504 are slidably connected to the inner side of one end of the limiting bracket 501. A compression spring 505 is fixedly connected between the outer side of one end of the spring plate 504 and the inner side of one end of the limiting bracket 501.

[0044] In an optional embodiment, a first rack is embedded and fixed inside the adjacent end of the two connecting rods 403. Both first racks can mesh with an intermediate gear 602. The central position of the intermediate gear 602 is rotatably connected to the rotating shaft bracket 601 via a rotating shaft.

[0045] In an optional embodiment, a second rack is fixedly connected to the outer rear end of each of the two connecting rods 403. The two second racks are respectively meshed with two working gears 701. The two working gears 701 are rotatably connected to the output shaft 702 through a one-way bearing. When the two connecting rods 403 move upward, the working gears 701 and the output shaft 702 will rotate freely.

[0046] In an optional embodiment, the upper and lower ends of the limiting plate 303 are fixedly connected with the first limiting strip 304, and the top inner side of the sliding block 201 is provided with a strip groove 204 that can cooperate with the first limiting strip 304.

[0047] In an optional embodiment, the cylinder 401, the shaft bracket 601, and the limiting bracket 501 are all fixedly installed inside the outer casing 801, the outer side of the output shaft 702 is rotatably installed on the inner side of one end of the outer casing 801 via a bearing, and the first rigid tube 301 and the second rigid tube 302 are both fixedly installed inside the outer casing 801 via pipe clamps.

[0048] In this embodiment: Traditional hydraulic motors are divided into vane type, gear type and cycloidal type, etc. These motors do not directly convert liquid pressure into mechanical power output, and there are many parts that cause wear. Most traditional hydraulic motors have a circular outline. Hydraulic motors with large torque are generally large in size. This is because traditional hydraulic motors do not directly convert liquid pressure into mechanical power output. If a larger torque is required, a larger size is generally used to obtain a larger torque.

[0049] The hydraulic motor of the present invention has a non-circular outline structure, but a square structure, which converts liquid pressure into mechanical power more directly, thereby achieving better conversion efficiency. It has a larger torque in the same volume, and the motor of the present invention has fewer wear parts, thereby reducing the failure rate.

[0050] During use, hydraulic oil needs to be continuously supplied to the two inlet hoses 101. The hydraulic oil can enter the internal channel of the sliding block 201 through the inlet hoses 101, such as... Figure 7 As shown, the oil inlet hose 101 on the left can enter the inside of the first rigid tube 301 through the oil inlet check valve 202. The hydraulic oil inside the first rigid tube 301 will flow into the inside of the right end of the cylinder 401. The hydraulic oil inside the second rigid tube 302 can be discharged through the oil outlet check valve 203 and then through the oil outlet hose 102. The limiting plate 303 can block the channel on the right side of the sliding block 201. Even if there is hydraulic oil with a certain liquid pressure inside the oil inlet hose 101 on the right side, the hydraulic oil can pass through the oil inlet check valve 202 in the channel on the right side of the sliding block 201. However, due to the blocking by the limiting plate 303, the hydraulic oil still cannot enter the inside of the second rigid tube 302.

[0051] Since the oil inlet check valve 202, oil inlet hose 101 and the channels on both sides of the sliding block 201 are always fixed and connected, mentioning any one of them can represent the overall meaning of the channels on both sides of the oil inlet check valve 202, oil inlet hose 101 and sliding block 201, and will not be repeated here.

[0052] Since the position of the limit plate 303 is fixed and will not move, such as Figure 8 As shown, when the sliding block 201 moves to the left, the right-side oil inlet check valve 202 is connected to the second rigid pipe 302. At this time, the hydraulic oil inside the second rigid pipe 302 will flow into the left end of the cylinder 401. The first rigid pipe 301 is connected to the outlet check valve 203. At this time, the hydraulic oil inside the first rigid pipe 301 will be discharged through the outlet hose 102. The left-side oil inlet check valve 202 is blocked by the limit plate 303. When there is a certain pressure of hydraulic oil in the two inlet hoses 101, the flow direction of the hydraulic oil in the first rigid pipe 301 and the second rigid pipe 302 can be continuously changed by the left and right movement of the sliding block 201.

[0053] Assuming that hydraulic oil inside the first rigid tube 301 is currently entering the inside of the cylinder 401, the hydraulic oil inside the first rigid tube 301 will enter the moving space of the piston 402 on the right side of the cylinder 401. The piston 402 moving downward will drive the connecting rod 403 to move downward, and the connecting rod 403 moving downward will drive the right-side power gear 701 to rotate. In this rotational direction, the right-side power gear 701 can drive the output shaft 702 to rotate through the one-way bearing, thereby realizing the power output of the output shaft 702. When the right-side connecting rod 403 moves downward... When in contact with the right-side sector block 506, the right-side connecting rod 403 can still continue to move downwards a certain distance. As the right-side connecting rod 403 continues to move downwards, it will press the right-side sector block 506 into the sliding block 201. During the pressing process, the sector block 506 needs to overcome the elastic force of the torsion spring 507 to rotate. Let the entire rotation stroke of the sector block 506 be denoted as X. When the sector block 506 rotates one-sixth of X, without considering the limiting effect of the arc head limiting rod 503 on the sliding block 201 (except for the arc head limiting rod 503), Besides the resistance caused by rod 503 to the movement of sliding block 201, the sum of other resistances (hereinafter referred to as other resistances) is sufficient to push sliding block 201 to overcome other resistances and move to the leftmost position. However, due to the influence of the arc-shaped head limiting rod 503, sliding block 201 needs to overcome the restriction of the arc-shaped head limiting rod 503 when moving. Part of the arc-shaped head of the arc-shaped head limiting rod 503 will be engaged at the limiting hole 205 opened in sliding block 201. It should be noted that the arc-shaped head limiting rod 503... The arc-shaped head of rod 503 is divided into a hemisphere, and a portion of the arc-shaped head is smaller than the hemisphere. When the right-side sector block 506 rotates five-sixths of its length, the elastic force of the right-side torsion spring 507 is greater than the other resistances of the sliding block 201 and the engaging resistance of the arc-shaped head limiting rod 503 on the sliding block 201. At this time, the sliding block 201 can move to the left due to the reaction force of the right-side torsion spring 507. The sliding block 201 will move to the left to its maximum stroke, thereby causing the limiting hole 205 of the sliding block 201 to engage and limit with the arc-shaped head limiting rod 503 again. Figure 5 and Figure 6 As shown, the sliding block 201 has three limiting holes 205 on both the upper and lower sides. Two arc-shaped limiting rods 503 are provided in the limiting brackets 501 on both the upper and lower sides. The distance between the three limiting holes 205 on each side is equal, and the distance between the two arc-shaped limiting rods 503 on each side is the same as the distance between the two adjacent limiting holes 205. This ensures that when the sliding block 201 moves to the left or right to the maximum stroke, the limiting holes 205 on the sliding block 201 can engage with the arc-shaped limiting rods 503.

[0054] After the sliding block 201 moves to the left, the original relationship of oil inlet in the first rigid pipe 301 and oil outlet in the second rigid pipe 302 will be changed to oil outlet in the first rigid pipe 301 and oil inlet in the second rigid pipe 302. After the second rigid pipe 302 is filled with oil, the hydraulic oil inside the second rigid pipe 302 will enter the inner left end of the cylinder 401, thereby pushing the piston 402 on the left to move downward. The piston 402 moving downward will drive the connecting rod 403 on the left to move downward. The connecting rod 403 moving downward will drive the intermediate gear 602 to rotate through the first rack on its right. The rotation of the intermediate gear 602 will drive the connecting rod 403 on the right to move upward at the same speed. The connecting rod 403 on the right will drive the piston 402 on the right to move upward. The piston 402 on the right will squeeze the hydraulic oil inside the right end of the cylinder 401 and discharge it through the first rigid pipe 301. The hydraulic oil inside the first rigid pipe 301 will eventually be discharged through the oil outlet hose 102.

[0055] As can be seen from the above, when there is hydraulic oil with a certain pressure inside both inlet hoses 101, the liquid pressure of the hydraulic oil can be converted into mechanical energy for the alternating up and down movement of the two connecting rods 403. Through the alternating movement of the two connecting rods 403 and the cooperation of the one-way gear, when either connecting rod 403 moves downward, it can drive the working gear 701 and drive the output shaft 702 to rotate. When either connecting rod 403 moves upward, it can only drive the working gear 701 to rotate freely, thereby realizing the continuous rotation of the output shaft 702. That is to say, when the connecting rod 403 moves back, the rotation of the output shaft 702 will have a brief pause. This motor can be used in working scenarios where the requirement for continuous rotation is not high.

[0056] To avoid or reduce short pauses during continuous motor rotation, such as Figure 10 As shown, two motors can be arranged side by side, with their output shafts 702 fixedly connected. The initial positions of the connecting rods 403 in the left and right motors are different. As long as the corresponding connecting rods 403 in the two motors do not move synchronously, when the connecting rod 403 in one motor is in a reversing motion, the other motor will inevitably continue to work. This ensures that the output power of the output shaft 702 will not be interrupted for a short time. In the same way, multiple motors can be connected in this manner to achieve a better continuous rotation effect.

[0057] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A reciprocating hydraulic motor, characterized in that: It includes two inlet hoses (101), one outlet hose (102), and a sliding block (201). The outlet hose (102) is located between the two inlet hoses (101). The sliding block (201) has three channels. The tops of the two inlet hoses (101) and the one outlet hose (102) are sequentially and fixedly connected to the channels of the sliding block (201). One-way valves (202) are installed in the channels on both the left and right sides of the sliding block (201), and one-way valves (203) are installed in the channel in the middle of the sliding block (201). A limiting plate (303) is slidably connected to the inner side of the front end of the sliding block (201). A first rigid tube (301) is fixedly installed on the inner side of the left end of the limiting plate (303), and a second rigid tube (302) is fixedly installed on the inner side of the right end of the limiting plate (303). The lower ends of the first rigid tube (301) and the second rigid tube (302) can simultaneously communicate with any two adjacent channels of the sliding block (201). When the lower ends of the first rigid tube (301) and the second rigid tube (302) are simultaneously connected with any two adjacent channels of the sliding block (201), the limiting plate (303) can simultaneously cover... The sliding block (201) has three channels; the sliding block (201) can move continuously left and right, thereby constantly switching the connection relationship between the first rigid tube (301), the second rigid tube (302) and the three channels inside the sliding block (201); the hydraulic motor also includes a cylinder (401), on which pistons (402) are slidably connected to the inner sides of both the left and right ends of the cylinder (401), and connecting rods (403) are fixedly connected to the bottom ends of the pistons (402). The two pistons (402) on the left and right sides and the connecting rods (403) can move alternately back and forth; the sliding block (201) The left and right ends of the sliding block (201) are fixedly connected to the inner sides of the two sides of the sliding block (201). The outer side of the rotating shaft is rotatably connected to the sector block (506). The two sector blocks (506) are respectively rotatably installed on the inner sides of the left and right ends of the sliding block (201) through the rotating shaft. The inner side of the rotating shaft is fixedly connected to one end of the torsion spring (507). The other end of the torsion spring (507) is fixedly connected to the outer side of one end of the sector block (506). The connecting rod (403) that is moving downward can contact the sector block (506) on the adjacent side and can press the sector block (506) on the adjacent side towards the inner side of the sliding block (201).The sliding block (201) has a second limiting strip (502) slidably connected to the inner sides of both its upper and lower ends. A limiting bracket (501) is fixedly connected to the outer side of one end of the second limiting strip (502). Limiting holes (205) are opened on the inner sides of both its upper and lower ends. A circular arc head limiting rod (503) is slidably connected to the inner side of one end of the limiting bracket (501). The hemispherical part of the circular arc head limiting rod (503) can cooperate with the limiting hole (205). A spring plate (504) is fixedly connected to the flat part of the circular arc head limiting rod (503). The outer surfaces of the spring plate (504) are slidably connected to the inner side of one end of the limiting bracket (501). The outer side of one end of the spring plate (504) is connected to the limiting bracket. A compression spring (505) is fixedly connected to the inner side of one end of the frame (501); a first rack is embedded and fixed to the inner side of the adjacent ends of the two connecting rods (403), and both first racks can mesh with an intermediate gear (602). The central position of the intermediate gear (602) is rotatably connected to the shaft support (601) through a rotating shaft; a second rack is fixedly connected to the outer rear end of each of the two connecting rods (403), and the two second racks mesh with two working gears (701) respectively. Both working gears (701) are rotatably connected to the output shaft (702) through a one-way bearing. When the two connecting rods (403) move upward, the working gears (701) and the output shaft (702) will rotate freely.

2. The reciprocating hydraulic motor according to claim 1, characterized in that: The upper and lower ends of the limiting plate (303) are fixedly connected with the first limiting strip (304), and the top inner side of the sliding block (201) is provided with a strip groove (204) that can cooperate with the first limiting strip (304).

3. The reciprocating hydraulic motor according to claim 1, characterized in that: The cylinder body (401), the rotating shaft bracket (601) and the limiting bracket (501) are all fixedly installed inside the outer shell (801). The outer side of the output shaft (702) is rotatably installed on the inner side of one end of the outer shell (801) through a bearing. The first rigid tube (301) and the second rigid tube (302) are both fixedly installed inside the outer shell (801) through pipe clamps.

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