Large crankshaft lightening hole boring device
By using the outer wall of the boring bar to fit the ball bearings, the boring bar is limited by the housing and the ball bearings, which solves the problem of low machining accuracy caused by boring bar wobbling and realizes high-precision crankshaft weight reduction hole machining.
Patent Information
- Application Number
- CN202520345518.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-02
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-03-02
AI Technical Summary
Existing CNC machine tools lack a limiting structure after installing extended boring bars and boring tools, which causes the boring tool to wobble when in contact with the crankshaft, resulting in low machining accuracy.
A large crankshaft weight reduction hole boring device was designed. By having the boring bar outer wall fit with the ball bearings, the housing and the ball bearings limit the boring tool, thereby improving the stability of the boring tool.
It effectively avoids boring tool wobbling and improves the machining accuracy of large crankshaft weight reduction holes.
Smart Images
Figure CN223776066U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of CNC machining technology, specifically to a large crankshaft weight reduction hole boring device. Background Technology
[0002] The crankshaft is one of the most important components in an internal combustion engine, serving as the engine's spine and a key part for bearing impact loads and transmitting power. The crankshaft mainly consists of the front end, main journals, connecting rod journals, cranks, counterweights, and rear end. Its primary function is to convert the gas pressure transmitted from the piston and connecting rod assembly into torque for external output, driving the engine's valve train and various other accessories. Some large crankshafts require weight-reducing holes machined on their surface; therefore, when using a boring machine, extended boring bars and boring tools are necessary.
[0003] However, a search revealed that in existing CNC machine tools, after installing the extended boring bar and boring tool, there is no structure to limit the movement of the boring bar. As a result, the boring tool below the boring bar is prone to slight wobbling after contacting the crankshaft. Moreover, the longer the boring bar, the greater the wobbling amplitude, thus resulting in lower machining accuracy. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model provides a large crankshaft weight reduction hole boring device, which solves the problem that in existing CNC machine tools, after installing an extended boring bar and boring tool, there is no structure to limit the boring bar. As a result, the boring tool under the boring bar is prone to slight wobbling after contacting the crankshaft, and the longer the boring bar, the greater the wobbling amplitude, thus resulting in low machining accuracy.
[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a large crankshaft weight reduction hole boring device, including a machine tool body, two pairs of telescopic rods are fixedly connected to the bottom end of the machine tool body, and a horizontal plate is fixedly connected to the bottom end of the telescopic rods. A pair of first vertical plates are fixedly connected to the bottom end of the horizontal plate, a fixing mechanism is installed on the first vertical plate, and a moving mechanism is installed on the outer wall of the machine tool body.
[0006] The fixing mechanism includes a first screw threadedly connected to the inside of the first vertical plate, a second vertical plate rotatably connected to the inner side of a pair of the first screws, a plurality of connecting rods fixedly connected to the end of the second vertical plate away from the first screws, and a housing fixedly connected to the end of the connecting rods away from the second vertical plate, ball bearings being disposed inside the housing, and a boring assembly being installed inside the horizontal plate.
[0007] Preferably, the boring assembly includes a spindle chuck rotatably connected to the inside of the cross plate, a spindle drive is connected to the top of the spindle chuck, a boring bar is connected to the bottom of the spindle chuck, and the outer wall of the boring bar fits against the outer wall of the ball bearing.
[0008] Preferably, the moving mechanism includes a slider fixedly connected to the top of the machine tool body, a crossbeam slidably engaged with the outer wall of the slider, a pair of third vertical plates fixedly connected to the bottom end of the crossbeam, a second screw rotatably connected between the pair of third vertical plates, a fourth vertical plate threadedly connected to the middle outer wall of the second screw, and the outer wall of the fourth vertical plate fixedly connected to the machine tool body, a motor fixedly connected to the outer wall of the third vertical plate on the right side, a reducer connected to the output shaft of the motor, and the output shaft of the reducer connected to the second screw.
[0009] Preferably, an electric push rod is fixedly connected to the lower interior of the machine tool body, and the telescopic end of the electric push rod is connected to the spindle drive.
[0010] Preferably, a rotating head is fixedly connected to the end of the first screw away from the second vertical plate.
[0011] Preferably, a stop bar is provided at the through hole of the first vertical plate, and the end of the stop bar away from the first vertical plate is fixedly connected to the second vertical plate.
[0012] Beneficial effects
[0013] This utility model provides a large crankshaft weight reduction hole boring device, which has the following beneficial effects:
[0014] The boring bar can be mounted on the spindle chuck. A hex wrench or manual rotation of the rotating head causes the first screw to rotate, moving it through the first vertical plate. The first screw, in conjunction with a stop bar, moves the second vertical plate, which in turn moves the housing via a connecting rod. The housing then moves the ball bearings until they are in contact with the outer wall of the boring bar. When the spindle drives the boring bar through the spindle chuck, the boring bar causes the ball bearings to roll within the housing. Simultaneously, the housing and ball bearings also obstruct and limit the movement of the boring bar, improving its stability and preventing wobbling. This results in higher precision boring of large crankshaft weight reduction holes. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of this utility model.
[0016] Figure 2 This is a partially enlarged schematic diagram of the present invention.
[0017] Figure 3 This is a partially enlarged schematic diagram of the present invention.
[0018] Figure 4 This is a partially enlarged schematic diagram of the present invention.
[0019] In the diagram: 1. Machine tool body; 2. Telescopic rod; 3. Horizontal plate; 4. First vertical plate; 5. First screw; 6. Second vertical plate; 7. Connecting rod; 8. Housing; 9. Ball bearing; 10. Spindle chuck; 11. Spindle drive; 12. Boring tool; 13. Electric actuator; 14. Stop bar; 15. Slider; 16. Crossbeam; 17. Third vertical plate; 18. Second screw; 19. Fourth vertical plate; 20. Motor; 21. Reducer; 22. Rotary head. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] Please see Figure 1-4 This utility model provides a technical solution: a large crankshaft weight reduction hole boring device, including a machine tool body 1, two pairs of telescopic rods 2 are fixedly connected to the bottom end of the machine tool body 1, and a horizontal plate 3 is fixedly connected to the bottom end of the telescopic rods 2. A pair of first vertical plates 4 are fixedly connected to the bottom end of the horizontal plate 3. A fixing mechanism is installed on the first vertical plate 4, and a moving mechanism is installed on the outer wall of the machine tool body 1.
[0022] The fixing mechanism includes a first screw 5 that is threadedly connected to the inside of the first vertical plate 4. A second vertical plate 6 is rotatably connected to the inner side of a pair of first screws 5. A plurality of connecting rods 7 are fixedly connected to the end of the second vertical plate 6 away from the first screw 5, and a housing 8 is fixedly connected to the end of the connecting rods 7 away from the second vertical plate 6. A ball bearing 9 is disposed inside the housing 8. A boring assembly is installed inside the horizontal plate 3.
[0023] The interior of the housing 8 is designed as a circular cavity, and the diameter of the opening of this cavity is smaller than the diameter of the ball 9, so as to prevent the ball 9 from falling out of the cavity of the housing 8.
[0024] In this embodiment, the boring assembly includes a spindle chuck 10 that is rotatably connected to the inside of the horizontal plate 3. A spindle drive 11 is connected to the top of the spindle chuck 10, and a boring bar 12 is connected to the bottom of the spindle chuck 10. The outer wall of the boring bar of the boring bar 12 is in contact with the outer wall of the ball bearing 9.
[0025] The boring bar 12 consists of a boring bar and a detachable cutting head. The boring bar of the boring bar 12 can be limited by the ball bearing 9 to prevent vibration and ensure the coaxiality and distribution of each crank neck hole, thus providing good balance for subsequent dynamic balancing.
[0026] In this embodiment, the moving mechanism includes a slider 15 fixedly connected to the top of the machine tool body 1, a crossbeam 16 slidably engaged with the outer wall of the slider 15, a pair of third vertical plates 17 fixedly connected to the bottom end of the crossbeam 16, a second screw 18 rotatably connected between the pair of third vertical plates 17, a fourth vertical plate 19 threadedly connected to the middle outer wall of the second screw 18, and the outer wall of the fourth vertical plate 19 fixedly connected to the machine tool body 1, a motor 20 fixedly connected to the outer wall of the third vertical plate 17 on the right side, a reducer 21 connected to the output shaft of the motor 20, and the output shaft of the reducer 21 connected to the second screw 18;
[0027] A groove is machined on the crossbeam 16 to facilitate the movement of the slider 15, thereby limiting the movement of the machine tool body 1.
[0028] In this embodiment, an electric push rod 13 is fixedly connected to the lower interior of the machine tool body 1, and the telescopic end of the electric push rod 13 is connected to the spindle drive 11.
[0029] In this embodiment, the end of the first screw 5 away from the second vertical plate 6 is fixedly connected to a rotating head 22;
[0030] The 22-inch head is a hexagonal head.
[0031] In this embodiment, a stop bar 14 is provided at the through hole of the first vertical plate 4, and the end of the stop bar 14 away from the first vertical plate 4 is fixedly connected to the second vertical plate 6.
[0032] A through hole is machined inside the first vertical plate 4, and a stop bar 14 is installed at this through hole. In this way, the first vertical plate 4 can support and limit the second vertical plate 6 through the stop bar 14.
[0033] It is worth noting that the electrical structures and other components involved in this application can be selected according to the user's needs, as long as they meet the requirements of this application. At the same time, the corresponding control circuits and other components are all existing technologies, which can be fully implemented by those skilled in the art, so they will not be described in detail here.
[0034] Those skilled in the art can connect the components in this case sequentially. The specific connection and operation sequence should refer to the working principle described below. The detailed connection methods are well-known technologies in the field. The working principle and process are mainly described below.
[0035] Example: When this device is needed, the external power supply and control circuits of each electrical structure can be connected, and then the boring bar 12 can be moved to install the boring bar 12 onto the spindle chuck 10. Then, by using a hex wrench or manually rotating the rotating head 22, the rotating head 22 drives the first screw 5 to rotate, so that the first screw 5 moves through the first vertical plate 4. The first screw 5, together with the stop bar 14, can drive the second vertical plate 6 to move, so that the second vertical plate 6 drives the housing 8 to move through the connecting rod 7. The housing 8 then drives the ball 9 to move until the ball 9 is in contact with the outer wall of the boring bar of the boring tool 12. In this way, when the spindle drive 11 drives the boring tool 12 to rotate through the spindle chuck 10, the boring tool 12 can drive the ball 9 to roll in the housing 8. At the same time, the housing 8 and the ball 9 will also block and limit the boring bar of the boring tool 12, thereby improving the stability of the boring bar on the boring tool 12 and preventing it from shaking. In this way, the subsequent boring of the large crankshaft weight reduction hole by the boring tool 2 will have higher precision.
[0036] When machining the crankshaft, first install the crankshaft onto the CNC machine tool's worktable, then start the motor 20 and electric actuator 13. The motor 20, in conjunction with the reducer 21, drives the second screw 18 to rotate, causing the second screw 18 to move the fourth vertical plate 19. The fourth vertical plate 19, in conjunction with the slider 15 and the crossbeam 16, moves the machine tool body 1, so that the machine tool body 1 moves the boring tool 12 via the telescopic rod 2, the cross plate 3, and the spindle chuck 10, adjusting the horizontal position of the boring tool 12. The electric actuator 13, in conjunction with the telescopic rod 2 and the cross plate 3, drives the spindle drive 11 to move, and the spindle drive 11, in turn, moves the boring tool 12 via the spindle chuck 10, adjusting the height position of the boring tool 12. At the same time, the spindle drive 11 rotates the boring tool 12 via the spindle chuck 10, thus enabling the boring of the weight-reducing hole on the crankshaft.
[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A large crankshaft weight reduction bore boring device, comprising a machine tool body (1), characterized in that: The bottom end of the machine tool body (1) is fixed with two pairs of telescopic rods (2), and the bottom end of the telescopic rods (2) is fixed with a horizontal plate (3). The bottom end of the horizontal plate (3) is fixed with a pair of first vertical plates (4). A fixing mechanism is installed on the first vertical plate (4). A moving mechanism is installed on the outer wall of the machine tool body (1). The fixing mechanism includes a first screw (5) that is threadedly connected to the inside of the first vertical plate (4), a second vertical plate (6) that is rotatably connected to the inside of a pair of first screws (5), a plurality of connecting rods (7) that are fixed to the end of the second vertical plate (6) away from the first screw (5), and a housing (8) that is fixed to the end of the connecting rods (7) away from the second vertical plate (6), ball bearings (9) that are disposed inside the housing (8), and a boring assembly that is installed inside the horizontal plate (3).
2. The large crankshaft weight reduction bore boring device according to claim 1, characterized in that, The boring assembly includes a spindle chuck (10) rotatably connected to the inside of the horizontal plate (3). The top end of the spindle chuck (10) is connected to a spindle drive (11), and the bottom end of the spindle chuck (10) is connected to a boring bar (12). The outer wall of the boring bar (12) is in contact with the outer wall of the ball (9).
3. The large crankshaft weight reduction bore boring device according to claim 1, characterized in that, The moving mechanism includes a slider (15) fixedly connected to the top of the machine tool body (1), a crossbeam (16) slidably engaged with the outer wall of the slider (15), a pair of third vertical plates (17) fixedly connected to the bottom end of the crossbeam (16), a second screw (18) rotatably connected between the pair of third vertical plates (17), a fourth vertical plate (19) threadedly connected to the middle outer wall of the second screw (18), and the outer wall of the fourth vertical plate (19) fixedly connected to the machine tool body (1), a motor (20) fixedly connected to the outer wall of the third vertical plate (17) on the right side, a reducer (21) connected to the output shaft of the motor (20), and the output shaft of the reducer (21) connected to the second screw (18).
4. The large crankshaft weight reduction hole boring device according to claim 1, characterized in that, An electric push rod (13) is fixedly connected to the lower interior of the machine tool body (1), and the telescopic end of the electric push rod (13) is connected to the spindle drive (11).
5. A large crankshaft weight reduction bore boring device according to claim 1, characterized in that, A rotating head (22) is fixed to the end of the first screw (5) away from the second vertical plate (6).
6. The large crankshaft weight reduction bore boring device according to claim 1, characterized in that, A stop bar (14) is provided at the through hole of the first vertical plate (4), and the end of the stop bar (14) away from the first vertical plate (4) is fixedly connected to the second vertical plate (6).