Automobile gearbox shell drilling tool with cooling structure

Abstract

The utility model discloses an automobile gearbox shell drilling tool with a cooling structure. The automobile gearbox shell drilling tool comprises a drilling tool base. A drill bit is arranged in the drilling tool seat; a driving end is arranged on the outer side of the drilling tool base and connected with the drill bit, and a cooling liquid supply cavity is formed in the inner side of the bottom of the drilling tool base. A bearing seat is arranged on the outer side of the cooling liquid supply cavity; the drill bit sequentially penetrates through the bearing seat and the cooling liquid supply cavity; a nozzle is arranged at the bottom of the cooling liquid supply cavity; the spray head is connected with the cooling liquid supply cavity through a telescopic mechanism; a limiting liquid outlet seat is arranged outside the drill bit; and the limiting liquid outlet seat is positioned in the cooling liquid supply cavity. The spray head is connected with the cooling liquid supply cavity through the telescopic mechanism, and when a drill hole is deep and the stroke of a drill bit is long, the traditional spray head is easy to interfere with a workpiece to influence the stroke of the drill bit; by the adoption of the design, after the spray head makes contact with the workpiece, the spray head can be inwards contracted in the cooling liquid supply cavity, the forward stroke of the drill bit cannot be interfered, and the working range of the drill bit is enlarged in a disguised mode.

Description

Technical Field

[0001] This utility model relates to a drilling tool, specifically a drilling tool for a cooling structure automotive gearbox housing, and belongs to the field of drilling equipment technology. Background Technology

[0002] In drilling operations targeting automotive transmissions, the transmission material is extremely rigid, resulting in extremely high temperatures between the drill bit and the transmission body during the drilling process. If the drill bit is exposed to this high temperature environment for an extended period, it is prone to deformation such as edge curling, rendering the drill bit unusable. Current technology typically uses liquid cooling to overcome this high drill bit temperature problem. This involves placing nozzles around the outer circumference of the drill bit. To cover as much of the drill bit area as possible, the nozzle length is equal to the drill bit length. However, this placement can interfere with the drill bit's downward movement, affecting its stroke. Therefore, further improvements are needed. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a drilling tool for automotive gearbox housing with a cooling structure. The drill bit position is flexible, the cooling method is adjustable, and it can adapt to different drilling conditions.

[0004] A drilling tool for an automotive gearbox housing with a cooling structure includes a drill bit holder; a drill bit is disposed inside the drill bit holder; a drive end is disposed on the outer side of the drill bit holder and connected to the drill bit; characterized in that: a coolant supply chamber is disposed on the inner bottom side of the drill bit holder; a bearing seat is disposed on the outer side of the coolant supply chamber; the drill bit passes through the coolant supply chamber and the bearing seat in sequence; a nozzle is disposed at the bottom of the coolant supply chamber; the nozzle is connected to the coolant supply chamber via a telescopic mechanism; a limiting outlet seat is disposed on the outer side of the drill bit; the limiting outlet seat is located inside the coolant supply chamber.

[0005] Furthermore, the coolant supply chamber has an inlet; the inlet is connected to the pump body via a hose; the upper and lower sides of the coolant supply chamber are respectively provided with an upper through hole and a lower through hole opposite to the drill bit; the bottom of the drill bit seat is provided with a rotating shaft hole; the outer side of the bearing seat is fixedly connected to the inner wall of the drill bit seat.

[0006] Furthermore, a bearing is provided inside the bearing housing; a spline groove is provided on the outer side of the drill bit; and splines are provided on the upper and lower sides of the bearing housing respectively.

[0007] Furthermore, the limiting fluid outlet seat is sleeved on the outside of the drill bit; the limiting fluid outlet seat includes a bottom ring; the bottom ring has a plurality of flow channels radially opened; the outer circumferential surface of the bottom ring is provided with an opening; a receiving seat is provided in the rotating shaft hole; the receiving seat, flow channels and opening are connected in sequence; the inner side of the receiving seat is provided with a seepage hole relative to the drill bit.

[0008] Furthermore, the nozzle includes at least two nozzles, which are evenly distributed in the coolant supply chamber; the nozzle has an outlet on the side near the drill bit; the bottom of the drill bit seat has an assembly hole relative to the nozzle; the telescopic mechanism includes an end plate on the top of the nozzle; the end plate has an end hole; the end hole communicates with the internal flow channel of the nozzle.

[0009] Furthermore, the telescopic mechanism also includes a lifting ring; a rotation limit post is provided on the bottom ring; the lifting ring includes a column provided on the surface of each end plate; the column and the lifting ring are connected by a bracket; the lifting ring is slidably connected to the outside of the column; a spring is provided between the lifting ring and the coolant supply chamber.

[0010] This utility model has the following advantages: First, the nozzle is connected to the coolant supply chamber through a telescopic mechanism. When the drilling is deep and the drill bit stroke is long, the traditional nozzle is prone to interfering with the workpiece and affecting the drill bit stroke. However, with this design, when the nozzle comes into contact with the workpiece, it can retract inward into the coolant supply chamber and will not interfere with the forward stroke of the drill bit, thereby indirectly expanding the working range of the drill bit.

[0011] Secondly, under low-speed operating conditions, the coolant supply to the pump body is relatively slow, and no pressure is formed inside. In this case, the coolant flows through the bottom ring and the receiving seat to the drill bit surface, providing water cooling. This unpressurized condition is suitable for drilling processes requiring temperature reduction. However, in drilling processes with higher speeds and temperatures, the coolant supply rate to the pump body increases, while the liquid outflow rate at the receiving seat is slower. This creates water pressure within the coolant supply chamber. The higher water pressure, combined with the nozzle, causes the coolant to spray from the nozzle, acting on the workpiece for cooling. Depending on the specific situation, different cooling modes can be selected to control the amount of coolant used and reduce waste. Attached Figure Description

[0012] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0013] Figure 2 This is a schematic diagram of the structure of the liquid outlet limiting seat.

[0014] Figure 3 This is a schematic diagram of the telescopic mechanism.

[0015] Wherein: 1 is the drill bit holder, 1-1 is the rotating shaft hole, 2 is the drill bit, 2-1 is the spline groove, 4 is the coolant supply chamber, 5 is the bearing seat, 5-1 is the spline, 6 is the nozzle, 6-1 is the nozzle outlet, 7 is the limiting liquid outlet seat, 7-1 is the bottom ring, 7-11 is the flow channel, 8 is the bearing, 9 is the receiving seat, 9-1 is the seepage hole, 10 is the end plate, 12 is the rotating limiting post, 13 is the lifting ring, 14 is the column, 15 is the bracket, and 16 is the spring. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0017] See Figures 1-3 This application discloses a drilling tool for an automotive gearbox housing with a cooling structure, including a drill bit holder 1; a drill bit 2 is disposed inside the drill bit holder 1; a drive end is disposed on the outer side of the drill bit holder 1 and connected to the drill bit 2; a coolant supply chamber 4 is disposed on the inner side of the bottom of the drill bit holder; a bearing seat 5 is disposed on the outer side of the coolant supply chamber 4; the drill bit 2 passes through the bearing seat 5 and the coolant supply chamber 4 in sequence; a nozzle 6 is disposed at the bottom of the coolant supply chamber; the nozzle 6 is connected to the coolant supply chamber 4 through a telescopic mechanism; a limiting outlet seat 7 is disposed on the outer side of the drill bit 2; the limiting outlet seat 7 is located inside the coolant supply chamber 4.

[0018] Furthermore, the coolant supply chamber 4 has an inlet; the inlet is connected to the pump body via a hose; the upper and lower sides of the coolant supply chamber 4 are respectively provided with an upper through hole and a lower through hole opposite to the drill bit 2; the bottom of the drill bit seat 1 is provided with a rotating shaft hole 1-1; the outer side of the bearing seat 5 is fixedly connected to the inner wall of the drill bit seat 1.

[0019] Furthermore, the bearing seat 5 is provided with a bearing 8; the drill bit 2 is provided with a spline groove 2-1 on the outer side; and the bearing seat 5 is provided with splines 5-1 on the upper and lower sides respectively.

[0020] Furthermore, the limiting liquid outlet seat 7 is sleeved on the outside of the drill bit; the limiting liquid outlet seat 7 includes a bottom ring 7-1; the bottom ring 7-1 has a plurality of flow channels 7-11 radially opened; the outer circumferential surface of the bottom ring 7-1 is provided with an opening; a receiving seat 9 is provided in the rotating shaft hole; the receiving seat 9, the flow channels 7-11 and the opening are connected in sequence; the inner side of the receiving seat 9 is provided with a seepage hole 9-1 opposite to the drill bit 2.

[0021] Specifically, in this embodiment, coolant is injected into the coolant supply chamber 4 through the inlet. When the injection process is relatively slow, the coolant will enter the receiving seat 9 through the flow channel 7-11 in the bottom ring 7-1, and then flow to the surface of the drill bit 2 through the seepage hole 9-1 on the inner side of the receiving seat 9, forming a relatively slow liquid flow cooling.

[0022] Meanwhile, the radial positions of the drill bit and drill rod are limited by the bearing 8 inside the bearing housing 5 and the rotation limiting post 12 on the surface of the bottom ring 7-1, preventing the drill bit and drill rod from moving radially during rotation, while the receiving seat 9 inside the rotating shaft hole does not serve a limiting function. Simultaneously, the spline on the bearing housing 5 limits the vertical position of the drill rod, preventing axial movement.

[0023] Furthermore, the nozzle 6 includes at least two nozzles, which are evenly distributed in the coolant supply chamber; the nozzle 6 has a nozzle 6-1 on the side near the drill bit; the bottom of the drill bit seat has an assembly hole relative to the nozzle; the telescopic mechanism includes an end plate 10 on the top of the nozzle 6; the end plate 10 has an end hole; the end hole communicates with the internal flow channel of the nozzle 6.

[0024] Furthermore, the telescopic mechanism also includes a lifting ring 13; a rotation limit post 12 is provided on the bottom ring 7-1; the lifting ring 13 includes a column 14 provided on the surface of each end plate; the column 14 and the lifting ring 13 are connected by a bracket 15; the lifting ring 13 is slidably connected to the outside of the column 14; a spring 16 is provided between the lifting ring and the coolant supply chamber.

[0025] Specifically, in this embodiment, when the liquid supply speed to the coolant supply chamber 4 is increased, the liquid outflow speed in the receiving seat 9 is slower and cannot be balanced with the inflow speed, which will increase the pressure in the coolant supply chamber 4. At this time, after the coolant enters the nozzle 6 through the end hole on the end plate 10, it will form a water mist or jet with water pressure under the action of pressure and the nozzle structure, which will cool the workpiece. At the same time, when the drilling depth is deep, after the nozzle 6 contacts the workpiece surface, it is squeezed upward, thereby causing the lifting ring 13 to move upward along the rotation limit post 12, overcoming the force of the spring 16.

[0026] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A drilling tool for an automotive gearbox housing with a cooling structure, comprising a drill bit holder; a drill bit is disposed within the drill bit holder; a drive end is disposed on the outer side of the drill bit holder and connected to the drill bit, characterized in that: The bottom inner side of the drill seat is provided with a cooling liquid supply cavity; the outer side of the cooling liquid supply cavity is provided with a bearing seat; the drill bit penetrates the bearing seat and the cooling liquid supply cavity in sequence; the bottom of the cooling liquid supply cavity is provided with a spray head; the spray head is connected with the cooling liquid supply cavity through an extension mechanism; the outer side of the drill bit is provided with a limiting liquid outlet seat; and the limiting liquid outlet seat is located in the cooling liquid supply cavity.

2. The automobile transmission case housing drilling tool with a cooling structure according to claim 1, characterized in that: The cooling liquid supply cavity has a liquid inlet; the liquid inlet is connected with a pump body through a hose; the upper and lower sides of the cooling liquid supply cavity are respectively provided with upper and lower through holes opposite to the drill; the bottom of the drill seat is provided with a rotating shaft hole; and the outer side of the bearing seat is fixedly connected with the inner wall of the drill seat.

3. The automobile transmission case housing drilling tool with a cooling structure according to claim 2, characterized in that: The bearing seat is provided with a bearing; the outer side of the drill bit is provided with a spline groove; and the upper and lower sides of the bearing seat are respectively provided with splines.

4. The automobile transmission case housing drilling tool with a cooling structure according to claim 3, characterized in that: The limiting liquid outlet seat is sleeved on the outer side of the drill bit; the limiting liquid outlet seat comprises a bottom ring; a plurality of flow channels are radially formed in the bottom ring; the outer circumferential surface of the bottom ring is provided with an opening; a receiving seat is arranged in the rotating shaft hole; the receiving seat, the flow channels and the opening are sequentially communicated; and a liquid permeation hole is formed in the inner side of the receiving seat opposite to the drill.

5. The automobile transmission case housing drilling tool with a cooling structure according to claim 4, characterized in that: The spray head comprises at least two, and is uniformly distributed in the cooling liquid supply cavity; the side of the spray head close to the drill is provided with a spray opening; the bottom of the drill seat is provided with an assembly hole opposite to the spray head; the extension mechanism comprises an end plate arranged on the top of the spray head; an end hole is formed in the body of the end plate; and the end hole is communicated with the internal flow channel of the spray head.

6. The automobile transmission case housing drilling tool with cooling structure according to claim 5, characterized in that: The extension mechanism further comprises a lifting ring; a rotating limiting column is arranged on the bottom ring; the lifting ring comprises a column arranged on the surface of each end plate; the column and the lifting ring are connected through a support; the lifting ring is slidingly connected to the outer side of the column; and a spring is arranged between the lifting ring and the cooling liquid supply cavity.

Images