Transmission case parking brake on engineering machinery
By using steel plates and wave springs in the parking brake of the transmission box of engineering machinery to replace the toothed splines, the production cost is reduced, and the high cost problem caused by machining toothed splines in the existing technology is solved.
Patent Information
- Application Number
- CN202520655872.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-09
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-04-09
AI Technical Summary
The existing parking brake for the transmission box of construction machinery has a high production cost because it requires machining toothed splines on the inner surface of the steel sleeve and the output shaft.
Steel plates I and II are used to fix the output shaft inside the steel sleeve and are connected by wave springs and disc springs, eliminating the need for toothed splines and replacing the toothed ring with a steel sleeve.
This reduced production costs while maintaining the effectiveness of the parking brake.
Smart Images
Figure CN223781936U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an engineering machinery, and more particularly to a parking brake for an upper transmission box of an engineering machinery, which is composed of friction plates, a disc spring, a cover plate, a piston, a cylinder and an output shaft. Background Technology
[0002] Currently, a parking brake for an upper transmission box of engineering machinery has been publicly disclosed on the market. Its structural features are as follows: it consists of friction plates, a disc spring, a cover plate, a piston, a cylinder, and an output shaft. The piston is fitted inside the cylinder. The cover plate is connected to the upper transmission box housing through the cylinder and a steel sleeve (gear ring). A release bolt that can connect to the upper end of the piston is provided on the cover plate. The moving friction plates and the stationary friction plates are arranged alternately in parallel. A toothed spline is provided in the inner hole of the steel sleeve, and a toothed spline is also provided on the outer circle of the stationary friction plate. The stationary friction plate is installed on the toothed spline inside the steel sleeve to form a whole. The inner hole of the toothed spline of the moving friction plate is connected to the external spline on the output shaft to form a whole. The lower end of the piston rests against the moving or stationary friction plates through a pressure plate. A disc spring is fitted on the cross-shaped piston, so that the upper end of the disc spring contacts the cover plate through a small pressure plate, and the lower end of the disc spring contacts the piston. This structure can achieve parking braking, but the production cost is high because toothed splines need to be machined on the inner surface of the steel sleeve and the output shaft. Summary of the Invention
[0003] The purpose of this invention is to provide a parking brake for the transmission box of engineering machinery with low production cost.
[0004] To achieve the above objectives, this utility model provides a parking brake for an upper transmission box of engineering machinery, comprising a friction plate, a disc spring, a cover plate, a piston, a cylinder, and an output shaft. The piston is fitted inside the cylinder. The cover plate is connected to the upper transmission box housing via the cylinder and a steel sleeve. A release bolt that can connect to the upper end of the piston is provided on the cover plate. A steel plate I is installed inside the steel sleeve and fitted onto the output shaft already installed inside the upper transmission box housing. A steel plate II is fixed at the bottom inside the steel sleeve. A friction plate that can contact the steel plate I is provided on the upper surface of the steel plate II. A wave spring is fitted on the output shaft between the steel plate I and the steel plate II. A pressure plate is installed at the lower end of the piston. A friction plate that can contact the steel plate I is provided on the lower surface of the pressure plate. A disc spring is provided between the cover plate and the piston. A release bolt that can connect to the upper end of the piston is provided on the cover plate.
[0005] An external spline is provided on the upper part of the output shaft to accommodate the steel sheet I, and a groove is provided on the output shaft below the external spline to accommodate the small pressure plate.
[0006] The brake release bolt is designed in a cross shape, with its upper length being shorter than its lower length, so that the lower part of the brake release bolt can be connected to the upper end of the piston.
[0007] A parking brake for an upper transmission box of engineering machinery may further consist of friction pads, a disc spring, a cover plate, a piston, a cylinder, and an output shaft. The piston is fitted inside the cylinder. The cover plate is connected to the upper transmission box housing via the cylinder and a steel sleeve. A release bolt that can connect to the upper end of the piston is provided on the cover plate. A disc spring is fitted on the steel sleeve between the steel sleeve and the lower end of the piston. The upper end of the piston contacts the lower surface of the pressure plate. A friction pad that can contact steel plate I is provided on the upper surface of the pressure plate. Steel plate I is installed on the output shaft already installed inside the upper transmission box housing. A wave spring is fitted on the output shaft above steel plate I and placed between steel plate I and the small pressure plate. A steel plate II is provided at the bottom of the cover plate inside the cylinder. A friction pad that can contact steel plate I is provided on the lower surface of steel plate II. A release bolt that can contact the upper end of the push rod is provided on the cover plate.
[0008] The small pressure plate is placed on the upper end face of the output shaft and connected to the output shaft by screws.
[0009] Multiple push rods are evenly distributed around the pressure plate to facilitate contact between the upper end of the push rod and the lower end of the release brake bolt.
[0010] Multiple screw holes that can be connected to the lower end of the push rod are evenly distributed around the pressure plate.
[0011] The lower end of the push rod is provided with a thread that can mate with the screw hole on the pressure plate.
[0012] A hole is provided at the axial center position of the piston to facilitate the passage of the output shaft.
[0013] A stop is provided on the inner surface of the cylinder body to prevent the steel sheet II from moving.
[0014] With this structure, steel plate I is installed inside the steel sleeve and fixed to the output shaft already installed in the upper transmission housing. Steel plate II is fixed at the bottom inside the steel sleeve, and friction plates that can contact steel plate I are provided on the upper surface of steel plate II. A wave spring is fitted on the output shaft between steel plates I and II. A pressure plate is installed at the lower end of the piston, and friction plates that can contact steel plate I are provided on the lower surface of the pressure plate. A disc spring is provided between the cover plate and the piston, and a release bolt that can connect to the upper end of the piston is provided on the cover plate. By replacing the gear ring with a steel sleeve, the toothed spline is eliminated, thereby achieving the goal of lower production costs. Attached Figure Description
[0015] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.
[0016] Appendix Figure 1 This is a schematic diagram of the main cross-section of a parking brake for a transmission box in engineering machinery according to this utility model.
[0017] Appendix Figure 2 This is a schematic main sectional view of another embodiment of the parking brake of the transmission box of engineering machinery according to this utility model.
[0018] In the diagram: 1. Release brake bolt 2. Cover plate 3. Disc spring 4. Cylinder body 5. Piston 6. Pressure plate 7. Steel sleeve 8. Friction plate 9. Steel plate I 10. Steel plate II 11. Output shaft 12. Upper transmission box housing 13. Small pressure plate 14. Wave spring 15. Push rod. Detailed Implementation
[0019] Appendix Figure 1 The present invention relates to a parking brake for an upper transmission box of engineering machinery, comprising a friction plate 8, a disc spring 3, a cover plate 2, a piston 5, a cylinder 4, and an output shaft 11. The piston 5 is fitted inside the cylinder 4. The cover plate 2 is connected to the upper transmission box housing 12 via the cylinder 4 and a steel sleeve 7. A release bolt 1, which connects to the upper end of the piston 5, is provided on the cover plate 2. A steel plate I9 is installed inside the steel sleeve 7 and is fitted onto the output shaft 11, which is already installed inside the upper transmission box housing 12, via a spline. An internal spline, which mates with the output shaft 11, is provided at the center of the steel plate I9. A steel plate II10 is fixed at the bottom inside the steel sleeve 7. A friction plate 8, which contacts the steel plate I9, is provided on the upper surface of the steel plate II10. A wave spring 14 is fitted on the output shaft 11 between the steel plates I9 and II10, such that the upper end of the wave spring 14 contacts the lower surface of the steel plate I9. The lower end of the spring 14 contacts the upper surface of the small pressure plate 13. The small pressure plate 13 is set on the output shaft 11 inside the steel plate II 10. A pressure plate 6 is installed at the lower end of the piston 5. The pressure plate 6 is connected to the lower end face of the piston 5 by bolts. A friction plate 8 that can contact the steel plate I 9 is provided on the lower surface of the pressure plate 6. A butterfly spring 3 is provided between the cover plate 2 and the piston 5. A release bolt 1 that can be connected to the upper end of the piston 5 is provided on the cover plate 2. An external spline that can fit the steel plate I 9 is provided on the upper part of the output shaft 11. A groove that can fit the small pressure plate 13 is provided on the output shaft 11 below the external spline. The small pressure plate 13 is a retaining ring. A groove that facilitates the entry of the bolt head at the lower end of the piston 5 is provided at the center position of the upper end face of the output shaft 11. The release bolt 1 is set in a cross shape, with its upper length being less than its lower length, so that the lower part of the release bolt 1 can be connected to the upper end of the piston 5.
[0020] Appendix Figure 2The parking brake for the upper transmission box of engineering machinery shown can also be composed of friction pads 8, a disc spring 3, a cover plate 2, a piston 5, a cylinder 4, and an output shaft 11. The piston 5 is fitted inside the cylinder 4. The cover plate 2 is connected to the upper transmission box housing 12 through the cylinder 4 and a steel sleeve 7. A release bolt 1 that can connect to the upper end of the piston 5 is provided on the cover plate 2. A disc spring 3 is fitted on the steel sleeve 7 between the lower end of the steel sleeve 7 and the lower end of the piston 5. The upper end of the piston 5 contacts the lower surface of the pressure plate 6. A friction pad 8 that can contact a steel plate 19 is provided on the upper surface of the pressure plate 6. The steel plate 19 is installed on the output shaft 11 that is already set inside the upper transmission box housing 12. A wave spring 14 is fitted on the output shaft 11 above the steel plate 19 and is placed between the steel plate 19 and the small pressure plate 13. A steel plate 2 is provided at the bottom of the cover plate 2 inside the cylinder 4. 10. A friction plate 8 is provided on the lower surface of steel plate II 10, which can contact steel plate I 9; a release bolt 1 is provided on the cover plate 2, which can contact the upper end of the push rod 15; the small pressure plate 13 is provided on the upper end surface of the output shaft 11 and connected to the output shaft 11 by screws; multiple push rods 15 are evenly distributed around the pressure plate 6, so that the upper end of the push rod 15 can contact the lower end of the release bolt 1; multiple screw holes are evenly distributed around the pressure plate 6, which can connect to the lower end of the push rod 15; a thread is provided at the lower end of the push rod 15, which can cooperate with the screw hole on the pressure plate 6; a hole is provided at the axial center of the piston 5, which allows the output shaft 11 to pass through; a stop is provided on the inner surface of the cylinder 4 to prevent the steel plate II 10 from moving; a shoulder is provided on the outer surface of the output shaft 11 to prevent the steel plate I 9 from moving.
Claims
1. A transmission case parking brake of a construction machine, which is composed of a friction plate, a butterfly spring, a cover plate, a piston, a cylinder and an output shaft, the piston being sleeved in the cylinder, the cover plate being connected with a transmission case housing through the cylinder and a steel sleeve, and a release brake bolt being arranged on the cover plate and capable of being connected with an upper end of the piston, characterized in that: In the steel sleeve (7) is installed steel sheet I (9), steel sheet I (9) is installed on the output shaft (11) which has been set in the upper transmission case shell (12), the bottom of the steel sleeve (7) is fixed with steel sheet II (10), the upper surface of steel sheet II (10) is provided with friction plate (8) which can contact with steel sheet I (9), the output shaft (11) between steel sheet I (9) and steel sheet II (10) is sleeved with wave spring (14), the lower end of the piston (5) is installed with pressure plate (6), the lower surface of pressure plate (6) is provided with friction plate (8) which can contact with steel sheet I (9), the butterfly spring (3) is set between the cover plate (2) and the piston (5), the release brake bolt (1) which can be connected with the upper end of the piston (5) is set on the cover plate (2). 2. A transmission park brake for a construction machine according to claim 1, characterized in that: The outer spline which can sleeve steel sheet I (9) is set on the upper part of the output shaft (11), the groove which can sleeve small pressure plate (13) is set on the output shaft (11) below the outer spline.
3. A transmission park brake for an engineering machine as claimed in claim 1 wherein: The release brake bolt (1) is set in cross shape, the upper length of which is less than the lower length, so that the lower part of the release brake bolt (1) can be connected with the upper end of the piston (5).
4. A transmission housing park brake for a construction machine, which is composed of a friction plate, a butterfly spring, a cover plate, a piston, a cylinder body and an output shaft, the piston being sleeved in the cylinder body, the cover plate being connected with a transmission housing shell through the cylinder body and a steel sleeve, and a release brake bolt being arranged on the cover plate and capable of being connected with an upper end of the piston, characterized in that: The butterfly spring (3) is sleeved on the steel sleeve (7) between the steel sleeve (7) and the lower end of the piston (5), the upper end of the piston (5) contacts with the lower surface of the pressure plate (6), the friction plate (8) which can contact with steel sheet I (9) is set on the upper surface of the pressure plate (6), the steel sheet I (9) is installed on the output shaft (11) which has been set in the upper transmission case shell (12), the wave spring (14) is sleeved on the output shaft (11) above the steel sheet I (9) and is set between the steel sheet I (9) and the small pressure plate (13), the steel sheet II (10) is set on the bottom of the cover plate (2) in the cylinder (4), the friction plate (8) which can contact with steel sheet I (9) is set on the lower surface of the steel sheet II (10), the release brake bolt (1) which can contact with the upper end of the ejector rod (15) is set on the cover plate (2).
5. A transmission park brake for an engineering machine according to claim 4 wherein: The small pressure plate (13) is set on the upper end surface of the output shaft (11) and is connected with the output shaft (11) through screw.
6. A power transmission housing park brake for an engineering machine as claimed in claim 4 wherein: The plurality of ejector rods (15) are evenly distributed on the periphery of the pressure plate (6), so that the upper end of the ejector rod (15) contacts with the lower end of the release brake bolt.
7. A power transmission housing park brake for an engineering machine as claimed in claim 6 wherein: The plurality of screw holes which can be connected with the lower end of the ejector rod (15) are evenly distributed on the periphery of the pressure plate (6).
8. A power transmission housing park brake for an engineering machine as claimed in claim 6 wherein: The thread which can cooperate with the screw hole on the pressure plate (6) is set on the lower end of the ejector rod (15).
9. The transmission case parking brake of the engineering machinery according to claim 4, wherein: The hole which is convenient for the output shaft (11) to pass through is set at the axial center position of the piston (5).
10. A power transmission housing park brake for an engineering machine as claimed in claim 4 wherein: The stop which can prevent the steel sheet II (10) from moving is set on the inner surface of the cylinder (4).