Size-adjustable gear radial prestress loading device

Abstract

The gear radial prestress loading device with the adjustable size is designed and used for applying radial prestress to a gear, and therefore the purpose of improving the surface machining quality of the gear is achieved. The device comprises four trapezoidal expansion blocks which are annularly arranged, the expansion blocks are attached to a section of circular truncated cone on a push rod, the push rod penetrates through a left side baffle, a fixing block, a limiting baffle and a right side baffle and is connected with the fixing block through a trapezoidal lead screw, and the fixing block is embedded in the left side baffle and can slide up and down; the left baffle and the right baffle are symmetrically arranged on the two sides of the limiting baffle, and the baffles on the two sides and the limiting bottom plate are connected with the bottom plate through bolts. The limiting bottom plate is provided with two T-shaped grooves, and the two positioning blocks can slide in the T-shaped grooves and are connected with the limiting baffle in the middle through bolts. According to the device, the position of the limiting baffle is fixed by adjusting the bolt for connecting the middle limiting baffle and the positioning block, axial movement of the gear is limited, the push rod is screwed to move rightwards, the expansion block is extruded to achieve radial expansion movement, the expansion block is attached to an inner hole of the machined gear, and prestress is applied to the gear in the radial direction. The device is large in loading strength and high in interchangeability, and prestress can be applied to gears of different sizes by replacing expansion blocks of different sizes.

Description

Technical Field

[0001] The invention relates to a gear radial prestressing loading device with adjustable size. Technical Background

[0002] In modern industry, gears are widely used in various mechanical transmission systems, offering advantages such as high transmission efficiency and stable and reliable operation. The quality of their surface processing is crucial to the stable and efficient operation of the equipment. Research has shown that applying prestress during gear processing has a positive effect on gear surface roughness, residual stress, and grinding force. Specifically, increasing prestress reduces surface roughness, improves surface quality, and increases the absolute value of residual stress.

[0003] The existing tightening patent (a double expansion sleeve gear hobbing fixture) 201921576968.3, its structure mainly consists of an expansion sleeve, an upper cone surface, a lower cone surface, an upper cone head, a lower cone head, a base, a rotating pull rod, a pull plate, a pull hole, a reduction gearbox, a motor, a rotating shaft, a fixed plate, two sets of left fixed sleeves, two sets of right fixed sleeves, two sets of left guide rods and two sets of right guide rods. The motor and reduction gearbox drive the rotating pull rod to rotate, causing the pull plate to move downward, applying a uniform downward force to the upper cone head, achieving uniform movement of the upper and lower cone heads toward each other and squeezing the upper and lower cone surfaces, causing the expansion sleeve to expand and fix the workpiece. This fixture is simple to operate and has a high degree of automation, but the limited pull plate travel results in a small radial adjustment range, and the structure is complex and has poor interchangeability.

[0004] The existing patent for a tensioning fixture (201210250896.X) for cylinder liner machining is 201210250896.X. Its structure primarily consists of a metal cylinder, plastic material, piston rod, cylinder liner, and shaft. The piston rod pushes the plastic material, causing it to expand, driving the ultra-thin metal cylinder to expand, evenly supporting the cylinder liner's interior, thereby machining the cylinder liner's shape and both ends simultaneously. However, the expansion of the plastic material renders the fixture's support rigidity insufficient, making it difficult to apply the high prestress required during gear machining.

[0005] Therefore, it is necessary to design a device for applying prestress with a wide range of applications and high reliability. Summary of the Invention

[0006] The present invention aims to overcome the shortcomings of existing technologies by providing a size-adjustable gear radial prestressing device. By replacing expansion blocks of different sizes and adjusting the positions of the stopper and fixed block, prestressing can be applied to gears of different sizes, achieving high interchangeability and loading strength.

[0007] The present invention is accomplished by the following technical solution: the device is symmetrically distributed with respect to the axis of the push rod (such as Figure 2 As shown); the taper of the push rod cone section and the four expansion blocks are all 1:1 (as shown Figure 3 The fixed block is embedded in the rounded rectangular groove of the left baffle (as shown in Figure 4 The positioning block is placed in the T-slot of the limit base plate, and the positioning block is connected to the limit baffle through the hexagon socket screw (as shown in Figure 5 (As shown). The fixing block is the same size as the short side of the rounded rectangular slot in the left baffle, so that it can only move up and down within the rounded rectangular slot; the four corners of the limit block are rounded to prevent the positioning block from getting stuck in the T-slot of the limit base plate; the limit base plate has a countersunk hole so that the limit baffle will not be affected by the connecting bolts between the limit base plate and the bottom plate when moving; the limit baffle has a U-shaped notch so that it does not affect the vertical movement of the push rod while limiting the axial movement of the gear; the right baffle is perpendicular to the gear surface to ensure that the gear will not deflect when prestress is applied; the push rod has a trapezoidal screw section that cooperates with the fixing block. When the push rod is tightened, the load will fix the position of the fixing block, and at the same time, the frustum section will also expand the expansion block to move it in the radial direction of the gear, thereby applying prestress to the gear.

[0008] As a preference: the use of trapezoidal screw drive can ensure strong bearing capacity and stable load, ensuring that the four expansion blocks are subjected to equal and uniform force.

[0009] As a preferred embodiment, the fixing block and the short side of the rounded rectangular groove of the left baffle are consistent in size to ensure that the fixing block does not rotate with the rotation of the push rod during the loading process.

[0010] As a preference, the left end of the push rod can be equipped with a torque wrench and a handle for loading and unloading.

[0011] The principle of the present invention is as follows: by twisting the push rod with a torque wrench, the push rod moves to the right, and the expansion block moves radially through the frustum section on the push rod, thereby achieving the effect of applying prestress to the gear.

[0012] Compared to existing technologies, the present invention achieves the following advantages: by placing four expansion blocks between the push rod's conical section and the gear's inner bore, turning the push rod to transmit and load the load through a trapezoidal screw, a stable and sufficiently large axial load can be applied, thereby squeezing the four expansion blocks to apply prestress in the radial direction. This device is simple to operate and easy to use, has a high load capacity, and is highly interchangeable. By replacing expansion blocks of different sizes, prestress can be applied to gears of different sizes, effectively improving machining efficiency and ensuring superior workpiece precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is an isometric schematic diagram of the overall structure of the present invention;

[0014] Figure 2 A top view of the present invention;

[0015] Figure 3 This is a schematic diagram of the installation of the push rod and expansion block of the present invention;

[0016] Figure 4 This is a schematic diagram of the installation of the left baffle of the fixed block of the present invention;

[0017] Figure 5 This is a schematic diagram of the installation of the positioning block and the limit baffle of the present invention;

[0018] Figure 6 This is a schematic diagram of the gear installation of the present invention;

[0019] Explanation of the accompanying drawings: 1-push rod; 2-base plate; 3-left baffle; 4-fixing block; 5-limiting base plate; 6-positioning block; 7-limiting baffle; 8-expansion block; 9-gear; 10-right baffle. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0021] (like Figure 1 As shown) is a gear radial prestressing loading device with adjustable size, which is symmetrically distributed with respect to the axis of the push rod (1) (as shown) Figure 2 As shown), the push rod (1) is provided with four expansion blocks (8) of the same size and shape distributed around the cone section (as shown in FIG. Figure 3 As shown), the gear (9) is installed on the outer diameter of the expansion block (as shown Figure 6 As shown). The trapezoidal screw rod section of the push rod (1) cooperates with the fixed block (4), and the fixed block (4) is placed in the rounded rectangular groove of the left baffle (3) (as shown). Figure 4 As shown). The limit baffle (7) is between the trapezoidal screw and the truncated cone section of the push rod (1) and is connected to the positioning block (6) through a hexagon socket screw. The positioning block (6) is placed in the T-slot of the limit base plate (5). The position of the limit baffle (7) is adjusted by loosening the hexagon socket screw and fixed by tightening the hexagon socket screw (as shown). Figure 5 The limiting base plate (5) is fixed to the base plate (2) by means of inner hexagonal bolts, and the left baffle (2) and the right baffle (10) are fixed to the base plate (2) by means of outer hexagonal bolts.

[0022] To prestress a gear, follow these steps:

[0023] Step 1: Turn the push rod in the opposite direction to move it away from the right baffle, leaving enough space for the gear to be placed. Adjust the fixing block to a reasonable position, turn the push rod to pass through the inner hole of the gear and move the gear side closer to the right baffle;

[0024] Step 2: Place the expansion blocks in a circular arrangement on the inner diameter of the gear, twist the push rod so that the frustum of the push rod fits with the expansion blocks, and adjust the limit baffle so that it fits tightly against the other side of the gear to limit the axial movement of the gear;

[0025] Step 3: Turn the push rod to make it move to the right. Under the action of the push rod, the expansion block will move in the radial direction to complete the application of gear prestress;

[0026] Step 4: Turn the push rod in the opposite direction to make it move to the left, thus completing the unloading of the gear prestress.

[0027] The basic principles, main features and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention, which is defined by the appended claims and their equivalents.

Claims

1. A gear radial prestressing loading device with adjustable size, mainly consisting of a push rod (1), a base plate (2), a left baffle (3), a fixing block (4), a limiting base plate (5), a positioning block (6), a limiting baffle (7), an expansion block (8), and a right baffle (10); the left baffle (3) and the right baffle (10) are of a structure that is narrow at the top and wide at the bottom, and are fixed to the base plate (2) by external hexagonal bolts; and characterized in that: A rounded rectangular groove is machined inward on the right side of the left baffle (3), and the right side is an 85° inclined surface to facilitate the adjustment of the fixed block (4) to slide up and down along the rounded rectangular groove on the left baffle (3); the left side of the right baffle (10) is a vertical surface, which fits one side of the gear (9) to which prestress is applied; the left section of the push rod (1) passes through the fixed block (4), the middle section passes through the limit baffle (7), the frustum section fits with the expansion block (8), and the rightmost end passes through the right baffle (10); the limit baffle (7) is connected to the positioning block (6) through a hexagon socket screw; the positioning block (6) slides in the T-slot of the limit base plate (5); the limit base plate (5) is fixed to the base plate (2) through a hexagon socket bolt.

2. The expansion block (8) according to claim 1, characterized in that The expansion blocks (8001), (8002), (8003), and (8004) are symmetrically distributed along the cylindrical ring. The four expansion blocks are identical in size, and the oblique sides of the axial sections are at a 45-degree angle to the axis. Under the extrusion of the push rod (1), the axial force is converted into radial force, and the four expansion blocks (8) slowly expand in the radial direction, close to the inner diameter of the gear (9) and continuously apply prestress. Here, the appropriate radial prestress is applied by controlling the torque of the twisting push rod. The application of prestress to gears of different sizes can be adapted by replacing expansion blocks of different sizes.

3. The push rod (1) according to claim 1, characterized in that: The push rod (1) comprises three irregular cylindrical sections, the left side of which is a section that can be matched with a torque wrench and a handle, wherein the matching section can be used for the torque wrench to apply torque and thus apply corresponding prestress, and the handle is turned in the opposite direction to unload the applied prestress; the middle section is a trapezoidal screw section, and the threaded section is matched with the fixed block (4) through a thread; the right end is a frustum section, the hypotenuse of the frustum section is 45 degrees with the axis, and the side surface of the frustum and the inner surface of the expansion block are lubricated.

4. The fixing block (4) according to claim 1, characterized in that: The fixing block (4) is a rounded square, and its size is consistent with the short side of the rounded rectangular groove of the left baffle (3) in claim 1; the through hole thread processed in the fixing block (4) cooperates with the push rod (1) in claim 3.

5. The limit baffle (7) according to claim 1, characterized in that: The baffle (7) is symmetrical along the axis of the push rod (1), and a U-shaped notch is machined in the middle for the push rod to move up and down.

6. The limiting base plate (5) according to claim 1, characterized in that: The surface of the limiting base plate (5) is provided with four countersunk holes, the depth of which is the height of the head of the matched hexagon socket bolt; and two T-shaped slots are machined under the surface.

7. The positioning block (6) according to claim 1, characterized in that: The positioning block (6) is in the shape of a rectangular block, and its long side is consistent with the width of the bottom of the T-slot of the limiting base plate (5); a through-hole thread is processed in the positioning block (6), and is connected to the limiting baffle (7) through a hexagon socket screw. When the hexagon socket screw is loosened, the positioning block (6) and the limiting baffle (7) can move along the T-slot on the limiting base plate (5), and can be fixed in position when tightened.

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