Core pulling device for integral forming of torque converter stator sand core

Abstract

The present invention discloses a core pulling device for integrally forming a stator sand core of a torque converter. The lower table is provided with a power unit, a driving gear and a plurality of core pulling mechanisms are movably mounted on the middle table, and a mold for forming the stator sand core is mounted on the upper table. The power unit drives the driving gear to rotate. The core pulling mechanism includes a transmission member and a slide plate. The lower end of the transmission member is engaged with the driving gear, and the upper end is engaged with the slide plate. The slide plate is movably connected to the middle table. The slide plate has a downwardly inclined chute. A pull block is movably connected in the chute. The upper end of the pull block is connected to a blade core. The power unit drives the slide plate to retreat on the middle table through the driving gear and the transmission member. The blade core enters the mold. The slide plate retreats, causing the pull block to slide down the chute and retreat, causing the blade core to be pulled out of the stator sand core. In this way, the present invention can form a stator sand core in one go, ensuring that the compactness, dimensional stability, and roughness of the sand core meet the dimensional accuracy, internal quality, and surface roughness requirements of the casting.

Description

Technical Field

[0001] The invention relates to the field of machinery, in particular to a core pulling device for integrally forming a stator sand core of a hydraulic torque converter. Background Art

[0002] The automotive torque converter is a key component of automatic transmissions, directly impacting their transmission efficiency and energy consumption. Breakthroughs in manufacturing technology and equipment for automotive torque converters are crucial for achieving import substitution and improving the overall manufacturing capabilities of my country's automatic transmission industry, and ultimately the automotive industry.

[0003] The core castings of a torque converter, the rotor and stator, are high-precision hydraulic castings. These castings consist of 16 to 21 blades with angles ≥45°. The minimum blade wall thickness is 1.2±0.5 mm, the R-value at the blade root is R0.6±0.25 mm, and the minimum internal flow channel cross-section dimensions are 4.3±0.3 mm in width and 18.3±0.3 mm in length. All blade surfaces must meet a roughness requirement of Rz80. Blade burrs, sand adhesion, and weld repairs are prohibited on the formed surfaces. Stringent requirements for dimensional accuracy, internal quality, and surface roughness are crucial for achieving these quality requirements. The core's compactness, dimensional stability, and roughness directly determine whether the casting meets design performance requirements, the scrap rate and cost, and whether the casting can be mass-produced. The stator sand core requires a one-time core-pulling process, and existing core-pulling devices are insufficient. Summary of the Invention

[0004] The main technical problem solved by the present invention is to provide a core pulling device for integrally forming a stator sand core of a hydraulic torque converter, which can form the stator sand core in one go and will not cause damage to the sand core during the core pulling process.

[0005] To solve the above technical problems, a technical solution adopted by the present invention is: to provide a core pulling device for integrally forming a stator sand core of a torque converter, comprising a lower table, a middle table and an upper table connected in sequence, wherein the lower table is provided with a power unit, a driving gear and a plurality of core pulling mechanisms evenly distributed along the outer circumference of the driving gear are movably mounted on the middle table, a mold for forming the stator sand core is mounted on the upper table, the power unit is engaged with the driving gear to drive the driving gear to rotate, the core pulling mechanism comprises a transmission member and a slide, the lower end of the transmission member is engaged with the driving gear, and the upper end is engaged with the slide, the slide is movably connected to the middle table, the slide has a downwardly inclined chute, a pumping block is movably connected in the chute, and the upper end of the pumping block is connected to a blade core, the power unit drives the slide to retreat on the middle table through the driving gear and the transmission member, the blade core enters the mold, the slide retreats to cause the pumping block to slide down the chute and synchronously retreat to pull the blade core out of the stator sand core.

[0006] In a preferred embodiment of the present invention, the slide plate is perpendicular to the middle table, and is inclined relative to the radial direction of the driving gear.

[0007] In a preferred embodiment of the present invention, the lower end of the slide plate has an extension portion extending to both sides, and the side surfaces of the extension portion have a rack engaged with the transmission member.

[0008] In a preferred embodiment of the present invention, the transmission member is rotatably connected to the middle table, and the upper and lower ends of the transmission member have gears. The gear at the lower end of the transmission member is engaged with the driving gear, and the gear at the upper end is engaged with the rack.

[0009] In a preferred embodiment of the present invention, the slide plate further has a mounting hole, a pulley is provided in the mounting hole, and the pulley is slidably connected to the middle table surface so that the slide plate slides in the track of the middle table surface.

[0010] In a preferred embodiment of the present invention, the pumping block includes a sliding shaft, the sliding shaft is arranged in a sliding groove with a clearance fit, and both ends of the sliding shaft are connected to connecting plates fixedly connected to the blade core.

[0011] In a preferred embodiment of the present invention, the power unit is a hydraulic cylinder, a gear block is installed at the front end of the hydraulic cylinder, the gear block is engaged with the driving gear, and the gear block moves back and forth to drive the driving gear to rotate.

[0012] In a preferred embodiment of the present invention, the number of the core-pulling mechanisms is 16-21.

[0013] The beneficial effects of the present invention are as follows: the core pulling device for integrally forming the stator sand core of the torque converter can form the stator sand core in one go, and the sand core will not be damaged during the core pulling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0015] Figure 1 It is a structural schematic diagram of a preferred embodiment of a core pulling device for integrally forming a stator sand core of a hydraulic torque converter according to the present invention;

[0016] Figure 2 yes Figure 1 Schematic diagram of the local structure;

[0017] Figure 3 yes Figure 1Schematic diagram of the local structure;

[0018] Figure 4 yes Figure 3 Schematic diagram of the local structure;

[0019] Figure 5 It is a structural diagram of the stator sand core;

[0020] The components in the accompanying drawings are marked as follows: 1. Lower table, 2. Middle table, 21. Driving gear, 3. Upper table, 4. Power unit, 41. Hydraulic cylinder, 42. Gear block, 5. Core pulling mechanism, 51. Transmission member, 52. Slide plate, 521. Slide groove, 522. Extension part, 523. Rack, 53. Pulling block, 531. Sliding shaft, 532. Connecting plate, 54. Blade core, 6. Mold, 7. Stator sand core. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figures 1 to 4 A core pulling device for integrally forming a stator sand core of a torque converter comprises a lower table 1, a middle table 2 and an upper table 3 connected in sequence. The lower table 1 is provided with a power unit 4. The middle table 2 is movably provided with a driving gear 21 and a plurality of core pulling mechanisms 5 evenly spaced along the outer periphery of the driving gear 21 (only one core pulling mechanism is shown in the figure for illustration). A mold 6 for forming a stator sand core 7 is mounted on the upper table 3. The power unit 4 meshes with the driving gear 21 to drive the driving gear 21 to rotate. The core pulling mechanism 5 comprises a transmission member 51 and a sliding member. Plate 52, the lower end of the transmission member 51 meshes with the driving gear 21, and the upper end meshes with the slide 52. The slide 52 is movably connected to the middle table 2. The slide 52 has a downwardly inclined chute 521. The chute 521 is movably connected to the extraction block 53. The upper end of the extraction block 53 is connected to the blade core 54. The power unit 4 drives the slide 52 to retreat on the middle table 2 through the driving gear 21 and the transmission member 51. The blade core 54 enters the mold 6. The slide 52 retreats, causing the extraction block 53 to slide down the chute 521 and retreat synchronously, so that the blade core 54 is extracted from the stator sand core 7. The connection structure of the transmission member, driving gear and other components with the table is a conventional connection structure that can be selected by those skilled in the art based on the existing technology.

[0023] In addition, the slide plate 52 is perpendicular to the middle table surface, and the slide plate 52 is inclined relative to the radial direction of the driving gear 21 .

[0024] In addition, the lower end of the slide plate 52 has an extension portion 522 extending to both sides, and the side surface of the extension portion 522 has a rack 523 engaged with the transmission member 51.

[0025] In addition, the transmission member 51 is rotatably connected to the middle table 2 , and the transmission member 51 has gears at its upper and lower ends. The gear at the lower end of the transmission member 51 is engaged with the driving gear 21 , and the gear at the upper end is engaged with the rack 523 .

[0026] In addition, the slide plate 52 also has a mounting hole, in which a pulley is provided. The pulley is slidably connected to the middle table 2 so that the slide plate 52 slides in the track of the middle table 2.

[0027] In addition, the pull-out block 53 includes a sliding shaft 531, which is loosely fitted in the slide groove 521. Both ends of the sliding shaft 531 are connected to connecting plates 532 fixedly connected to the blade core 54. The shape and position of the blade core 54 are determined according to the structure of the stator sand core 7 and are not limited to the shape and position disclosed in the drawings of this application.

[0028] In addition, the power unit 4 is a hydraulic cylinder 41 (the hydraulic cylinder can be replaced by other linear motion components, such as a stepping motor, etc.), and a gear block 42 is installed at the front end of the hydraulic cylinder 41. The gear block 42 is engaged with the driving gear 21, and the gear block 42 moves back and forth to drive the driving gear 21 to rotate.

[0029] In addition, the number of the core-pulling mechanisms 5 is 16-21.

[0030] The specific working principle of the core-pulling device for integrally forming the stator sand core of the torque converter of the present invention is as follows: the blade core 54 corresponding to the core-pulling mechanism 5 is sent into the mold 6 according to the designed position, and the stator sand core is cast in the mold 6 (the mold for casting the stator sand core is designed according to conventional technical means). When the casting is completed, the hydraulic cylinder 41 is started, and the hydraulic cylinder 41 drives the front end gear block 42 to retreat. The gear block 42 retreats and drives the driving gear 21 to rotate. The driving gear 21 synchronously drives the transmission parts 51 of all the core-pulling mechanisms 5 to rotate. During the rotation process, the rotating part 51 drives the slide plate 52 to move backward in the track of the middle table 2 through the rack 523 of the slide plate 52. When the slide plate 52 moves backward, it pulls the extraction block 53 backward. At the same time, the extraction block 53 also slides down along the slide groove 521 on the slide plate 52. At this time, the blade core 54 on the extraction block 53 is extracted from the stator sand core 7. All the blade cores 54 are synchronously extracted by the core-pulling mechanism 5, and finally the mold is disassembled. Figure 5 , an integrally formed stator sand core 7 is obtained, and the gap area arranged around the center of the stator sand core 7 is formed after the blade core 7 is pulled out.

[0031] Different from the prior art, the core pulling device for integrally forming the stator sand core of a torque converter of the present invention can form the stator sand core in one go without causing damage to the sand core during the core pulling process.

[0032] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A core pulling device for integrally forming a sand core of a torque converter stator, comprising a lower table, a middle table and an upper table connected in sequence, characterized in that: The lower table is provided with a power unit, a driving gear and a plurality of core-pulling mechanisms evenly spaced along the outer circumference of the driving gear are movably installed on the middle table, and a mold for stator sand core molding is installed on the upper table, the power unit is meshed with the driving gear to drive the driving gear to rotate, and the core-pulling mechanism includes a transmission member and a slide, the lower end of the transmission member is meshed with the driving gear, and the upper end is meshed with the slide, and the slide is movably connected to the middle table, and the slide has a downwardly inclined slide groove, a pumping block is movably connected in the slide groove, and the upper end of the pumping block is connected to the blade core, the blade core enters the mold, and the stator sand core is cast in the mold, and the power unit drives the slide back on the middle table through the driving gear and the transmission member, and the slide retreats to cause the pumping block to slide down the slide groove and synchronously retreat to cause the blade core to be pulled out of the mold to obtain an integral stator sand core.

2. The core-pulling device for integrally forming a sand core of a torque converter stator according to claim 1, characterized in that: The slide plate is vertically arranged with respect to the middle table surface, and is inclined with respect to the radial direction of the driving gear.

3. The core pulling device for integrally forming a sand core of a torque converter stator according to claim 2, characterized in that: The lower end of the slide plate is provided with an extension portion extending to both sides, and the side surfaces of the extension portion are provided with a rack engaged with the transmission member.

4. The core-pulling device for integrally forming a sand core of a torque converter stator according to claim 3, characterized in that: The transmission member is rotatably connected to the middle table, and the upper and lower ends of the transmission member are provided with gears. The gear at the lower end of the transmission member is engaged with the driving gear, and the gear at the upper end is engaged with the rack.

5. The core-pulling device for integrally forming a sand core of a torque converter stator according to claim 4, characterized in that: The slide plate is further provided with a mounting hole, in which a pulley is provided. The pulley is slidably connected to the middle table surface so that the slide plate slides in the track of the middle table surface.

6. The core-pulling device for integrally forming a sand core of a torque converter stator according to any one of claims 1 to 5, characterized in that: The pumping block includes a sliding shaft, which is arranged in a sliding groove with a clearance fit, and both ends of the sliding shaft are connected to connecting plates that are fixedly connected to the blade core.

7. The core-pulling device for integrally forming a sand core of a torque converter stator according to claim 6, characterized in that: The power unit is a hydraulic cylinder, a gear block is installed at the front end of the hydraulic cylinder, the gear block is engaged with the driving gear, and the gear block moves back and forth to drive the driving gear to rotate.

8. The core-pulling device for integrally forming a sand core of a torque converter stator according to claim 7, characterized in that: The number of the core-pulling mechanisms is 16-21.

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