Front cover plate of three-row bearing structure

Abstract

The utility model provides a kind of three-row bearing structure front cover plate, it is related to automobile engineering technical field, specifically including pump body, bearing box, shaft body and impeller, the side of pump body away from bearing box is provided with front cover plate and pedestal, pump body and pedestal fixed connection, the outside of front cover plate is fixedly installed with annular plugboard, and annular plugboard is inserted into the inside of pedestal and with its sliding connection, the outside of shaft body is fixedly installed with several rolling bodies, several rolling bodies are all rotatably connected with bearing box, and the corresponding two sides of shaft body are all provided with fixed structure on pedestal.The three-row bearing structure formed by the outside of shaft body fixedly installed 3 rolling bodies in the application, the radial load and axial load that shaft body can be supported when running are evenly distributed, avoid the problem such as wear aggravation, temperature sudden rise caused by single bearing due to excessive stress, and by front cover plate and pedestal sliding fit, improve assembly compatibility, reduce production and maintenance difficulty.

Description

Technical Field

[0001] This utility model relates to the field of automotive engineering technology, specifically a front cover plate with a three-row bearing structure. Background Technology

[0002] In automotive pump systems, the DE255 three-row bearing, as a core component, plays a crucial role in ensuring the stable and efficient operation of the pump. Automotive pumps are widely used in many important aspects of automotive engines, such as fuel supply, cooling system water circulation, and hydraulic power steering. Their performance directly affects the vehicle's power output, heat dissipation, and handling stability. The front cover plate, as an indispensable part of the DE255 three-row bearing, plays a vital supporting role in the normal operation of the bearing.

[0003] Chinese Patent Publication No. CN222478961U discloses a split-type alloy pump with a front cover. It includes a front cover, pump body, impeller assembly, pump cover, sealing box, mechanical seal component, bearing housing, and anti-rotation chuck. A shaft is mounted in the middle of the pump body, divided into a front end and a rear end. The impeller assembly is mounted on the front end of the shaft, and an anti-rotation chuck is mounted on the impeller nut. The front cover is bolted to the pump body near the impeller, and the bearing housing is bolted to the side away from the pump body. The rear end of the shaft passes through the middle of the bearing housing. A pump cover is installed between the bearing housing and the pump body, and a sealing box is mounted on the pump cover. A mechanical seal component is provided between the front end of the shaft and the sealing box. This utility model adds a front cover to the traditional centrifugal pump, allowing for easy disassembly and repair of the internal components by simply removing the front cover.

[0004] In the existing technology, the use of a split-type alloy pump with a front cover plate only mentions the "bearing housing" component, without explaining the specific structure of the bearing (such as the number and rows of rolling elements) and the load distribution design. According to the attached drawings, a traditional single bearing structure is used, which cannot achieve uniform load distribution during use. A single bearing (or a bearing with a common structure) is prone to increased wear due to excessive local stress, thus shortening the bearing's service life. Therefore, we have made an improvement and proposed a front cover plate with a three-row bearing structure. Utility Model Content

[0005] The purpose of this utility model is to address the problems of insufficient optimization of the bearing structure of the current split alloy pump with front cover plate, resulting in weak load-bearing capacity and easy wear and high temperature.

[0006] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0007] A front cover plate with a three-row bearing structure, which forms a three-row bearing structure with three rolling elements fixedly installed on the outside of the shaft, evenly distributes the radial load and axial load during shaft operation, thereby improving the above-mentioned problems.

[0008] The application is as follows:

[0009] A front cover plate with a three-row bearing structure includes a pump body, a bearing housing, a shaft, and an impeller. The pump body has a front cover plate and a base on the side away from the bearing housing. The pump body and the base are fixedly connected. An annular insert plate is fixedly installed on the outer side of the front cover plate and is inserted into the interior of the base and slidably connected thereto. A plurality of rolling elements are fixedly installed on the outer side of the shaft. The rolling elements are rotatably connected to the bearing housing. Fixed structures are provided on the base on the corresponding sides of the shaft.

[0010] As a preferred technical solution of this application, the fixed connection includes a sliding plate, and a plurality of fixing rods are fixedly installed on the side of the sliding plate near the front cover plate. The plurality of fixing rods pass through the annular insert plate and are slidably connected thereto. The plurality of fixing rods are slidably connected to the base. A threaded rod is provided inside the sliding plate. The threaded rod passes through the sliding plate and is threadedly connected thereto. The threaded rod is rotatably connected to the base. A worm gear is fixedly installed on one side of the threaded rod. A worm is meshed on the outer side of the worm gear. The worm gear and the worm are rotatably connected to the base.

[0011] As a preferred technical solution of this application, a sealing ring is embedded in the annular insert plate and at the junction of the annular insert plate and several fixed rods. A handle is fixedly installed on the top of each of the two worm gears, and the handle passes through one side of the base and is rotatably connected to it. The base has grooves on both sides, and the two handles are respectively inserted into the two grooves and rotatably connected to them.

[0012] As a preferred technical solution of this application, a rubber pad is fixedly installed on the side of the annular insert plate near the base, and the rubber pad is slidably connected to the base;

[0013] As a preferred technical solution of this application, a tapered guide block is rotatably connected inside the front cover plate, and a limit ring is fixedly installed on the outer side of the tapered guide block away from the shaft, and the limit ring is inserted into the interior of the front cover plate and slidably connected thereto.

[0014] As a preferred technical solution of this application, a number of support rods are fixedly installed on the side of the tapered guide block near the shaft, and an arc plate is fixedly installed on the end of each of the support rods away from the shaft. The arc plates are inserted into the interior of the shaft and slidably connected to it.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] In the scheme of this application:

[0017] (1) By fixing three rolling elements on the outside of the shaft to form a three-row bearing structure, the radial load and axial load borne by the shaft during operation can be evenly distributed, avoiding problems such as increased wear and sudden temperature rise caused by excessive force on a single bearing. Furthermore, the sliding fit between the front cover plate and the base improves assembly adaptability and reduces production and maintenance difficulty.

[0018] (2) By threading the threaded rod and the sliding plate, the extension length of the fixed rod can be finely adjusted. The locking force can be precisely controlled according to the fit between the front cover and the base, so as to avoid deformation of the front cover due to excessive locking or failure of sealing due to excessive loose locking. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a front sectional view of the present invention.

[0021] Figure 3 This is a schematic diagram of the internal structure of the pump body of this utility model;

[0022] Figure 4 This is a partial structural diagram of the present invention.

[0023] Explanation of reference numerals in the accompanying drawings: 1. Pump body; 2. Front cover plate; 3. Bearing housing; 4. Base; 5. Shaft; 6. Impeller; 7. Rolling element; 8. Conical guide block; 9. Annular insert plate; 10. Support rod; 11. Slide plate; 12. Fixing rod; 13. Threaded rod; 14. Worm gear; 15. Worm; 16. Arc plate. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings.

[0025] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] Example 1: Please refer to the appendix of the instruction manual. Figure 1-2, a front cover plate with a three-row bearing structure, including a pump body 1, a bearing housing 3, a shaft 5 and an impeller 6. A front cover plate 2 and a base 4 are provided on the side of the pump body 1 away from the bearing housing 3. The pump body 1 and the base 4 are fixedly connected. An annular insert plate 9 is fixedly installed on the outer side of the front cover plate 2 and is inserted into the interior of the base 4 and slidably connected thereto. Several rolling elements 7 are fixedly installed on the outer side of the shaft 5. There are three rolling elements 7. All of the rolling elements 7 are rotatably connected to the bearing housing 3. Fixed structures are provided on the base 4 on the corresponding sides of the shaft 5.

[0031] In this embodiment of the invention, when the DE255 automotive pump is running, engine power is transmitted to the shaft 5 through a transmission mechanism. The shaft 5 drives the impeller 6 to rotate, thus achieving fluid intake and discharge. During this process, the three rolling elements 7 on the outer side of the shaft 5 form independent rotating pairs with the bearing housing 3, constituting a three-row bearing structure.

[0032] The three rolling elements 7 evenly distribute the radial and axial loads borne by the shaft 5, avoiding excessive wear on a single bearing due to excessive load;

[0033] The bearing housing 3 provides a stable support frame for the rolling elements 7, ensuring that the rolling elements 7 maintain precise concentricity during rotation and reducing the radial runout of the shaft 5;

[0034] The front cover plate 2 slides with the base 4 through the annular insert plate 9, and its position can be adjusted according to the assembly requirements of the pump body 1. After the position is determined, it is locked by the fixing structure on both sides of the base 4 to ensure that the front cover plate 2 and the pump body 1 are sealed and fitted.

[0035] In this embodiment of the utility model, the three-row bearing structure distributes the load evenly through three rolling elements 7. Compared with traditional single-row or double-row bearings, the radial and axial load-bearing capacities are improved, which can effectively meet the load requirements of the DE255 automotive pump under high-frequency and high-load conditions, reduce the radial runout of the shaft 5, and improve the operational stability of the pump body 1.

[0036] The even distribution of load avoids excessive wear on a single bearing. Combined with the stable support of bearing housing 3, this extends the service life of the bearing and reduces the maintenance cost and replacement frequency of the DE255 automotive pump.

[0037] The front cover 2 slides with the base through the annular insert plate 9, and its position can be adjusted according to the assembly requirements of the pump body 1 to adapt to different installation scenarios of the DE255 truck pump and reduce the assembly difficulty.

[0038] Example 2: Please refer to the appendix of the instruction manual. Figure 1-4. As a preferred embodiment of this utility model, the fixed connection includes a slide plate 11. Several fixing rods 12 are fixedly installed on the side of the slide plate 11 near the front cover plate 2. The fixing rods 12 pass through the annular insert plate 9 and are slidably connected to it. The fixing rods 12 are slidably connected to the base 4. A threaded rod 13 is provided inside the slide plate 11. The threaded rod 13 passes through the slide plate 11 and is threadedly connected to it. The threaded rod 13 is rotatably connected to the base 4. A worm gear 14 is fixedly installed on one side of the threaded rod 13. A worm 15 is meshed on the outside of the worm gear 14. The worm gear 14 and the worm 15 are rotatably connected to the base 4.

[0039] Sealing rings are embedded in the annular insert plate 9 and at the junction of the annular insert plate 9 and several fixed rods 12. A handle is fixedly installed on the top of each of the two worm gears 15. The handle passes through one side of the base 4 and is rotatably connected to it. Grooves are opened on both sides of the base 4. The two handles are inserted into the two grooves respectively and are rotatably connected to them. Sealing rings are embedded in the base 4 and at the junction of the base 4 and the two handles.

[0040] A rubber pad is fixedly installed on the side of the annular insert plate 9 near the base 4, and the rubber pad is slidably connected to the base 4.

[0041] A tapered guide block 8 is rotatably connected inside the front cover plate 2. A limit ring is fixedly installed on the outer side of the tapered guide block 8 away from the shaft 5, and the limit ring is inserted into the interior of the front cover plate 2 and slidably connected to it. The smaller diameter end of the tapered guide block 8 faces the shaft 5.

[0042] A number of support rods 10 are fixedly installed on the side of the tapered guide block 8 near the shaft 5. There are three support rods 10. An arc plate 16 is fixedly installed on the end of each support rod 10 away from the shaft 5. The arc plates 16 are inserted into the inside of the shaft 5 and slidably connected to it.

[0043] In this embodiment of the utility model, when it is necessary to fix the relative position of the front cover plate 2 and the base 4, the operation procedure is as follows:

[0044] Turning the handle of worm 15 causes worm 15 to rotate around its own axis. Since worm 15 meshes with worm wheel 14, the rotation of worm 15 drives worm wheel 14 to rotate synchronously.

[0045] The worm gear 14 is fixedly connected to the threaded rod 13, and the rotation of the worm gear 14 drives the threaded rod 13 to rotate around its own axis.

[0046] The threaded rod 13 and the slide plate 11 are connected by a thread, and the slide plate 11 is restricted by the fixed rod 12 and cannot rotate (it can only move axially). Therefore, the rotation of the threaded rod 13 is converted into the movement of the slide plate 11 along the axial direction of the threaded rod 13.

[0047] The sliding plate 11 drives the fixing rod 12 to move synchronously. After the fixing rod 12 passes through the annular insert plate 9 and the base 4, its end is tightly abutted against the inner side wall of the base 4 (or embedded in the positioning hole of the base 4), thereby locking the annular insert plate 9 inside the base 4 and realizing the fixed connection between the front cover plate 2 and the base 4.

[0048] If the front cover plate 2 needs to be disassembled or adjusted, the worm gear 15 can be rotated in the opposite direction to drive the threaded rod 13 to rotate in the opposite direction, so that the slide plate 11 and the fixing rod 12 retract and release the lock on the annular insert plate 9.

[0049] The sealing ring at the junction of the annular insert plate 9 and the fixed rod 12 remains tightly fitted to the outer wall of the fixed rod 12 during its sliding process. This prevents fluids (such as engine oil and coolant) inside the pump body 1 from leaking through the gap between the fixed rod 12 and the annular insert plate 9, while also preventing external dust from entering the pump body 1. The handle is embedded in the groove of the base 4, which on the one hand prevents the handle from being damaged by collisions with other parts during vehicle operation, and on the other hand, the sealing ring in the groove can further prevent impurities from entering the base 4, protecting the transmission mechanism of the worm gear 14 and the worm 15. At the same time, the handle is hexagonal in design, which facilitates operation with conventional tools such as wrenches and screwdrivers, reducing the maintenance difficulty of the DE255 automotive pump and improving maintenance efficiency.

[0050] When the annular insert plate 9 is inserted into the base 4, the rubber pad at the end of the annular insert plate 9 first contacts the inner end face of the base 4. The elasticity of the rubber pad can buffer the impact force between the annular insert plate 9 and the base 4, avoid scratches and deformation caused by direct contact between metal parts, and extend the service life of the front cover plate 2 and the base 4. After being squeezed, the rubber pad will tightly fill the tiny gap between the annular insert plate 9 and the base 4, forming a secondary seal. Combined with the seal between the annular insert plate 9 and the fixing rod 12, it further improves the overall sealing performance of the pump body 1 and reduces fluid leakage.

[0051] When the DE255 automotive pump draws in fluid, the fluid enters from the inlet of pump body 1 and first contacts the conical guide block 8:

[0052] The cone-shaped guide block 8, with its "small end facing inward and large end facing outward" structure, forms a funnel-shaped channel that can gather the dispersed fluid into the rotating area of ​​the shaft 5 and impeller 6, reducing the vortex phenomenon of the fluid at the inlet and lowering the flow resistance.

[0053] The conical guide block 8 is rotatably connected to the front cover plate 2 via a bearing. When the fluid impacts the conical guide block 8, it can drive the conical guide block 8 to rotate, further reducing the frictional resistance between the fluid and the guide block and improving the fluid conveying efficiency.

[0054] The limiting ring can restrict the axial displacement of the conical guide block 8, preventing it from axially shifting due to fluid impact during rotation, thus ensuring the stability of the guiding effect.

[0055] When shaft 5 rotates, it drives tapered guide block 8 to rotate synchronously through the following structure:

[0056] The rotation of the shaft 5 is transmitted to the arc plate 16 through the annular groove. Since the arc plate 16 and the groove of the shaft 5 are tightly fitted, the rotation of the shaft 5 directly drives the arc plate 16 to rotate.

[0057] The arc plate 16 is fixedly connected to the conical guide block 8 via the support rod 10. Therefore, the rotation of the arc plate 16 drives the support rod 10 and the conical guide block 8 to rotate synchronously, ensuring that the rotation speed of the conical guide block 8 is consistent with that of the shaft 5, and avoiding fluid disturbance caused by the difference in rotation speed between the two.

[0058] The support rod 10 adopts a design with three ring arrays, which can transmit torque evenly and prevent the tapered guide block 8 from rotating eccentrically due to uneven force. At the same time, the sliding fit between the arc plate 16 and the shaft 5 allows the shaft 5 to undergo slight axial thermal expansion and contraction due to temperature rise during operation, preventing the structure from jamming.

[0059] In this embodiment of the utility model, the worm gear 14 and worm 15 transmission have a self-locking characteristic, that is, the worm 15 can drive the worm gear 14 to rotate, but the worm gear 14 cannot drive the worm 15 to rotate. Therefore, after the front cover plate 2 is fixed, even if it is subjected to fluid impact or vibration, the threaded rod 13 will not rotate on its own, ensuring that the fixed structure will not loosen and improving the operational reliability of the DE255 truck pump under bumpy road conditions. The threaded connection between the threaded rod 13 and the slide plate 11 can be finely adjusted. By controlling the rotation angle of the worm 15, the extension length of the fixing rod 12 can be precisely adjusted to ensure the fit between the front cover plate 2 and the base 4, avoiding structural deformation caused by excessive tightness or leakage caused by excessive looseness.

[0060] The double sealing ring design (between the annular insert 9 and the fixing rod 12, and between the handle and the groove) effectively prevents fluid leakage and impurities from entering, reducing the leakage of the DE255 automotive pump. It also protects the internal transmission mechanism from dust and moisture corrosion, extending the service life of the transmission components. Simultaneously, the exposed handle design combined with the groove protection facilitates quick operation during maintenance and prevents damage from impacts during driving, shortening the disassembly and installation time of the front cover 2 and improving maintenance efficiency. Furthermore, the handle's embedding in the groove prevents scratches to operators or other parts caused by protruding structures, meeting the safety design standards of the DE255 automotive pump.

[0061] The cushioning effect of the rubber pad reduces hard contact wear between the annular insert plate 9 and the base 4, thereby reducing the amount of wear on both and extending the service life of the front cover plate 2 and the base 4. Furthermore, the secondary seal formed by the rubber pad provides an emergency seal when the main seal (the sealing ring between the fixing rod 12 and the annular insert plate 9) fails, preventing malfunctions of the DE255 automotive pump due to seal failure and improving operational safety. Additionally, the elastic properties of the rubber pad absorb some vibration energy, reducing collision noise between the front cover plate 2 and the base 4, thus lowering the operating noise of the DE255 automotive pump and improving driving comfort.

[0062] The funnel-shaped structure of the conical guide block 8 reduces fluid eddies and lowers flow resistance, thereby increasing the flow rate of the DE255 automotive pump and reducing energy consumption, meeting the energy-saving requirements of automobiles. The converged fluid can act evenly on the impeller 6, avoiding local wear of the impeller 6 caused by uneven fluid distribution and extending the service life of the impeller 6 and shaft 5. At the same time, reducing eddies can reduce the impact of fluid on the internal structure of the pump body 1, reduce the vibration of the pump body 1, reduce the operating amplitude of the DE255 automotive pump, and improve the overall operating stability.

[0063] The design of the three support rods 10 arranged in a 120° annular array can evenly transmit the torque of the shaft 5 to the conical guide block 8, ensuring that the guide block is under balanced force and will not rotate eccentrically due to uneven torque distribution. At the same time, the tight fit between the arc plate 16 and the annular groove of the shaft 5 can achieve "gap-free transmission" of torque, ensuring that the rotation speed of the conical guide block 8 and the shaft 5 is completely synchronized, avoiding fluid eddies or disturbances caused by the difference in their speeds, further improving the fluid delivery stability of the DE255 automotive pump, and reducing pump body 1 vibration or noise caused by fluid disturbances. In addition, this structure achieves connection through the "insertion-type" fit between the arc plate 16 and the groove of the shaft 5. During assembly, only the arc plate 16 needs to be aligned with the groove and inserted to complete the initial positioning, without the need for professional equipment or complex processes.

[0064] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the scope of the technical solution of the present utility model.

Claims

1. A front cover plate with a three-row bearing structure, comprising a pump body (1), a bearing housing (3), a shaft (5), and an impeller (6), characterized in that, The pump body (1) is provided with a front cover plate (2) and a base (4) on the side away from the bearing housing (3). The pump body (1) and the base (4) are fixedly connected. An annular insert plate (9) is fixedly installed on the outer side of the front cover plate (2), and the annular insert plate (9) is inserted into the interior of the base (4) and slidably connected to it. Several rolling elements (7) are fixedly installed on the outer side of the shaft (5). Several rolling elements (7) are rotatably connected to the bearing housing (3). Fixed structures are provided on the base (4) and on the corresponding sides of the shaft (5).

2. The front cover plate with a three-row bearing structure according to claim 1, characterized in that, The fixed connection includes a slide plate (11). Several fixed rods (12) are fixedly installed on one side of the slide plate (11) near the front cover plate (2). Several fixed rods (12) pass through the annular insert plate (9) and are slidably connected to it. Several fixed rods (12) are slidably connected to the base (4). A threaded rod (13) is provided inside the slide plate (11). The threaded rod (13) passes through the slide plate (11) and is threadedly connected to it. The threaded rod (13) is rotatably connected to the base (4). A worm gear (14) is fixedly installed on one side of the threaded rod (13). A worm (15) meshes with the outside of the worm gear (14). The worm gear (14) and the worm (15) are rotatably connected to the base (4).

3. A front cover plate with a three-row bearing structure according to claim 2, characterized in that, Sealing rings are embedded on the annular insert plate (9) and at the junction of the annular insert plate (9) and several fixed rods (12). A handle is fixedly installed on the top of each of the two worm gears (15), and the handle passes through one side of the base (4) and is rotatably connected to it. The base (4) has grooves on both sides, and the two handles are inserted into the two grooves respectively and are rotatably connected to them.

4. The front cover plate with a three-row bearing structure according to claim 1, characterized in that, A rubber pad is fixedly installed on the side of the annular insert plate (9) near the base (4), and the rubber pad is slidably connected to the base (4).

5. A front cover plate with a three-row bearing structure according to claim 1, characterized in that, The front cover plate (2) is rotatably connected to a tapered guide block (8). A limit ring is fixedly installed on the outer side of the tapered guide block (8) away from the shaft (5), and the limit ring is inserted into the interior of the front cover plate (2) and slidably connected to it.

6. A front cover plate with a three-row bearing structure according to claim 5, characterized in that, The tapered guide block (8) has several support rods (10) fixedly installed on the side near the shaft (5). Each of the support rods (10) has an arc plate (16) fixedly installed at the end away from the shaft (5). Each of the arc plates (16) is inserted into the shaft (5) and slidably connected to it.

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