Hydraulic end face driving clamp for shaft

Abstract

The utility model discloses a hydraulic end face driving clamp for a shaft. The hydraulic end face driving clamp comprises a driving pin seat, a support and a base which are sequentially connected in the axial direction. A lower tip is embedded in the axis of the driving pin seat, and a driving pin penetrates through the driving pin seat and is movably arranged; a floating assembly, a lower push rod and a lower pull rod are sequentially arranged below the driving pin in an ejecting mode and axially penetrate through the support and the base. According to the hydraulic end face driving clamp for the shaft, the upper portion and the lower portion of the clamp are positioned through center holes, a lower tip is changed into a fixed tip, the end face is driven through the floating assembly after positioning, the driving pin is made to be in a floating free movement mode and can float along with jumping of the end of a part, and it is guaranteed that the driving pin is evenly stressed.

Description

Technical Field

[0001] This utility model belongs to the field of clamps, specifically a hydraulic end face drive clamp for shafts. Background Technology

[0002] In automotive transmissions and retarders, shaft components often include splines and gears, such as auxiliary gearbox main shafts, retarder splined shafts, intermediate gearbox shafts, and secondary shafts. These components require that the spline pitch circle and outer diameter be concentric with the outer diameter of the shaft or the center bore. Taking a splined shaft as an example, the radial runout requirement for spline 1 is Fr ≤ 0.04 for spur gears, and for spline 2, Fr ≤ 0.02 (based on the center bore). The original process was mechanical end-drive, the principle of which is as follows: Figure 2 As shown, the lower center is a floating support, positioned by the end face after being pressed down by spring force. The end face has fixed tooth profiles and is driven by hydraulic pressure pressed against the end face of the part. This design presents two problems: First, the center and the inner hole have a clearance fit, which may cause the center to shift during the pressing process, resulting in poor positioning accuracy and poor repeatability. Second, during end face positioning, the end runout is large (based on the center hole). During axial positioning of the part's end face, the drive seat wears unevenly, reducing its lifespan and affecting subsequent quality.

[0003] Most machining methods currently available on the market involve mechanical end-face drive machining or external cylindrical positioning machining. However, due to structural limitations of some parts, external cylindrical positioning cannot be used. Furthermore, the repeatability of mechanical end-face machining is unstable due to manufacturing reasons. Therefore, it is impossible to guarantee 100% compliance with requirements for Fr (finger position). Utility Model Content

[0004] This utility model provides a hydraulic end face drive fixture for shafts, which improves the repeatability and positioning accuracy of gear hobbing. The positioning is achieved by using center holes for both the upper and lower parts, and the lower center is changed to a fixed center. After positioning, the end face is driven by a floating component, so that the drive pin is in a free floating form, which can float with the end jump of the part, ensuring that the drive pin is subjected to uniform force.

[0005] To achieve the above objectives, the technical solution adopted by this utility model includes:

[0006] A shaft hydraulic end face drive fixture, comprising:

[0007] The drive pin seat, support and base are connected sequentially along the axial direction;

[0008] The lower tip is embedded in the shaft of the drive pin seat, and the drive pin is movably set through the drive pin seat.

[0009] A floating component, a push rod, and a pull rod are sequentially mounted under the drive pin, and the floating component, push rod, and pull rod axially penetrate the support and base.

[0010] Optionally, the push rod is provided with a long cylindrical rod body, and a cylindrical upper opening receiving cavity is provided at the top of the rod body;

[0011] The floating component includes a floating cross shaft 91 and a floating block;

[0012] The floating cross shaft 91 is mounted in the receiving cavity of the lower push rod in the form of arc surface contact, and the floating block is at least sleeved on one shaft head of the floating cross shaft 91 and moves freely.

[0013] The drive pin makes tight contact with the floating block.

[0014] Optionally, the contact method between the floating block and the opening receiving cavity on the floating cross shaft and the lower push rod is an arc surface, an arc point, or an arc line contact.

[0015] Optionally, the floating cross shaft is a cross-shaped shaft, with mounting rings of larger outer diameters at both ends of one shaft and mounting rings of smaller outer diameters at both ends of the other shaft;

[0016] The upper opening receiving cavity sidewall is provided with openings that fit the floating cross shaft. One axial opening is rectangular and is used to mount a mounting ring with a larger outer diameter; the other axial opening is circular and is used to mount a mounting ring with a smaller outer diameter.

[0017] Optionally, the floating block has a structure consisting of a solid block and a semi-circular ring.

[0018] A semi-circular notch is cut into the solid block, forming a complete circular opening with the semi-circular ring structure, which is fitted onto one of the shaft heads of the floating cross shaft 91 and can move freely.

[0019] Optionally, a square positioning block is fitted onto the shaft with the larger outer diameter of the floating cross shaft and the mounting ring, with the floating block fitted onto the positioning block.

[0020] Optionally, there are four drive pins arranged around the lower tip.

[0021] Optionally, the push rod and the pull rod are connected by a thread.

[0022] Optionally, the bottom end of the pull rod is attached to the base through a sleeved guide sleeve and a cover plate.

[0023] Optionally, the drive pin seat, support and base are connected by bolts or pins.

[0024] The advantages of this utility model are:

[0025] The hydraulic end face drive fixture for shafts of this utility model is positioned by center hole positioning at both the top and bottom, and the lower center is changed to a fixed center. After positioning, the end face is driven by a floating component, so that the drive pin is in a free floating form and can float with the end jump of the part, ensuring that the drive pin is subjected to uniform force. Attached Figure Description

[0026] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0027] Figure 1 This is a schematic diagram of the shaft hydraulic end face drive fixture of this utility model;

[0028] Figure 2 for Figure 1 A three-dimensional structural diagram of the push rod and floating assembly in the middle;

[0029] Figure 3 for Figure 2 The three views of the floating cross axis in the floating component (a is the front view, b is the top view, and c is the right view);

[0030] Figure 4 for Figure 2 The three views of the floating block in the floating component (a is the front view, b is the top view, and c is the right view);

[0031] The labels in the diagram represent:

[0032] 1-Drive pin, 2-Drive pin seat, 3-Support, 4-Base, 5-Guide sleeve, 6-Cover plate, 7-Pull rod, 8-Push rod, 9-Floating assembly, 91-Floating cross shaft, 92-Floating block, 10-Lower center. Detailed Implementation

[0033] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0034] Combination Figure 1-4 The present invention relates to a hydraulic end-face drive fixture for a shaft, comprising: a drive pin seat 2, a support 3, and a base 4 connected sequentially along the axial direction; a lower center 10 embedded in the axis of the drive pin seat 2, through which a drive pin 1 is movably disposed; a floating component 9, a lower push rod 8, and a lower pull rod 7 sequentially abutting the drive pin 1, the floating component 9, the lower push rod 8, and the lower pull rod 7 axially penetrating the support 3 and the base 4. Figure 1As shown, during center positioning, the upper center point faces downwards, pressing against the upper center hole of the part. The lower center point 10 is a fixed center point, fixed on the drive pin seat 2, pressing against the lower center hole. The guide sleeve 5 is connected and positioned to the bottom of the gear hobbing machine. The base 4 is connected to the machine tool. The machine tool hydraulic cylinder pushes the pull rod 7 upwards. The pull rod 7 pushes the push rod 8 through a threaded connection. The pull rod 7 pushes the push rod 8, which in turn pushes the floating component 9. The floating component 9 pushes the drive pin 1, thus pressing against the lower end face of the part. In other words, the shaft hydraulic end face drive fixture of this utility model uses center hole positioning for both the upper and lower parts. The lower center point 10 is changed to a fixed center point. After positioning, the end face is driven by the floating component 9, making the drive pin 2 a free-moving floating form. It can float with the end jump of the part, ensuring that the drive pin 2 is subjected to uniform force and can adapt to the shape and position differences during part processing. Unlike the original fixture that relies on the center hole for positioning on the upper part and the end face for positioning on the lower part, the new end face drive uses the center hole for positioning on both the upper and lower parts, resulting in higher positioning accuracy.

[0035] In the embodiments of this disclosure, the lower push rod 8 is provided with a long cylindrical rod body, and a cylindrical upper-opening receiving cavity is provided at the top of the rod body; the floating assembly 9 includes a floating cross shaft 91 and a floating block 92; the floating cross shaft 91 is mounted in the receiving cavity of the lower push rod 8 in the form of arc surface contact, and the floating block 92 is sleeved on at least one shaft end of the floating cross shaft 91 and is free to move; the drive pin 1 is in abutting contact with the floating block 92. The lower push rod 8 pushes the floating cross shaft 91, the floating cross shaft 91 pushes the floating block 92, and the floating block 92 pushes the drive pin 1 to abut against the lower end face of the part, realizing that the drive pin 1 is floating drive, which can solve the problem of uneven axial force caused by end runout difference.

[0036] In the embodiments of this disclosure, the contact between the floating block 92 and the floating cross shaft 91 and the opening receiving cavity on the lower push rod 8 is an arc surface, an arc point, or an arc line contact. The specific floating principle is as follows: Figure 2-4 As shown, the lower push rod 8 and the floating cross shaft 91 are in contact with each other on an arc surface, and the floating cross shaft 91 and the floating block 92 are in contact with each other on an arc surface. When there is a height difference between the two sets of drive pins 1, the floating cross shaft 91 can rotate with the lower push rod 8, so that the drive pin 1 can achieve the function of floating with the jump.

[0037] In the embodiments of this disclosure, the floating cross shaft 91 is a cross-shaped shaft with mounting rings of larger outer diameters at both ends of one shaft and mounting rings of smaller outer diameters at both ends of the other shaft; openings are cut into the side wall of the upper opening receiving cavity to match the floating cross shaft, one axial opening is rectangular and mounting rings of larger outer diameters are mounted thereon; the other axial opening is circular and mounting rings of smaller outer diameters are mounted thereon.

[0038] In the embodiments of this disclosure, the floating block 92 is a structure consisting of a solid block and a semi-circular ring. A semi-circular notch is cut into the solid block, forming a complete circular opening with the semi-circular ring, and it is fitted onto one end of the floating cross shaft 91 and can move freely. The contact between the floating block 92 and the opening receiving cavity on the floating cross shaft 91 and the lower push rod 8 is achieved through arc surface contact, arc point contact, or arc line contact.

[0039] In the embodiments of this disclosure, a square positioning block is sleeved on the shaft of the floating cross shaft 91 with a mounting ring on the larger outer diameter. The floating block 92 is sleeved on the positioning block. The positioning block facilitates the quick confirmation of the installation position of the floating block 92, and by cooperating with the mounting ring at the end, it also realizes the limitation of the floating block 92's movement within a certain range.

[0040] In the embodiments of this disclosure, there are four drive pins 1, which are arranged around the lower center point 10. The four drive pins 1 are respectively placed on two floating blocks 92. When the heights of the two drive pins 1 are inconsistent or the jumping is not good, the floating blocks 92 can rotate with the floating cross shaft. When there is a height difference between the two sets of drive pins 1, the floating cross shaft 91 can rotate with the lower push rod 8, so that the four drive pins 1 can achieve the function of floating with jumping.

[0041] In the embodiments disclosed herein, the push rod 8 and the pull rod 7 are connected by threads to achieve a fixed connection that is easy to assemble and disassemble.

[0042] In the embodiments disclosed herein, the bottom end of the pull rod 7 is attached to the base 4 through the sleeved guide sleeve 5 and the cover plate 6. The guide sleeve 5 is connected and positioned to the bottom of the gear hobbing machine. The base 4 is connected to the machine tool. The hydraulic cylinder of the machine tool pushes the pull rod 7 upward to realize the transmission of force.

[0043] In the embodiments of this disclosure, the drive pin seat 2, the support 3 and the base 4 are connected by bolts or pins, which makes them easy to disassemble and process.

[0044] Although the present invention has been described in detail above with general description and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A hydraulic face drive clamp for a shaft, characterized by, include: The drive pin seat (2), support (3) and base (4) are connected sequentially along the axial direction; A lower tip (10) is embedded in the shaft of the drive pin seat (2), and a drive pin (1) is movably set through the drive pin seat (2); A floating component (9), a lower push rod (8), and a lower pull rod (7) are sequentially mounted under the drive pin (1). The floating component (9), the lower push rod (8), and the lower pull rod (7) axially penetrate the support (3) and the base (4).

2. The hydraulic face drive collet for a shaft as set forth in claim 1, wherein The push rod (8) is provided with a long cylindrical rod body, and a cylindrical upper opening receiving cavity is provided at the top of the rod body; The floating component (9) includes a floating cross shaft (91) and a floating block (92); The floating cross shaft (91) is mounted in the receiving cavity of the lower push rod (8) in the form of arc surface contact, and the floating block (92) is at least sleeved on one shaft head of the floating cross shaft (91) and moves freely; The drive pin (1) is in tight contact with the floating block (92).

3. The hydraulic face drive collet for a shaft as set forth in claim 2, wherein The contact between the floating block (92) and the opening receiving cavity on the floating cross shaft (91) and the lower push rod (8) is an arc surface, an arc point, or an arc line contact.

4. The hydraulic face drive clamp for a shaft according to claim 2 or 3, characterized by The floating cross shaft (91) is a cross-shaped shaft with a larger outer diameter mounting ring at both ends of one shaft and a smaller outer diameter mounting ring at both ends of the other shaft. The upper opening receiving cavity sidewall is provided with openings that fit the floating cross shaft. One axial opening is rectangular and is used to mount a mounting ring with a larger outer diameter; the other axial opening is circular and is used to mount a mounting ring with a smaller outer diameter.

5. The hydraulic face drive clamp for a shaft according to claim 2 or 3, characterized by The floating block (92) is a structure consisting of a solid block and a semi-circular ring. A semi-circular notch is cut into the solid block, forming a complete circular opening with the semi-circular ring structure, which is fitted onto one of the shaft heads of the floating cross shaft (91) and moves freely.

6. The hydraulic face drive clamp for a shaft according to claim 2 or 3, characterized by A square positioning block is fitted onto the shaft of the floating cross shaft (91) with a ring mounted on its larger outer diameter, and the floating block (92) is fitted onto the positioning block.

7. The hydraulic face drive clamp for a shaft as set forth in claim 1, 2 or 3, wherein There are four drive pins (1), which are arranged around the lower tip (10).

8. The hydraulic face drive clamp for a shaft as set forth in claim 1, 2 or 3, wherein The push rod (8) and pull rod (7) are connected by threads.

9. The hydraulic face drive clamp for a shaft as set forth in claim 1, 2 or 3, wherein The bottom end of the pull rod (7) is attached to the base (4) through the sleeved guide sleeve (5) and cover plate (6).

10. The hydraulic face drive clamp for a shaft as set forth in claim 1, 2 or 3, wherein The drive pin seat (2), support (3) and base (4) are connected by bolts or pins.

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