Variable valve lift of pedal motorcycle
By adopting a variable valve lift system on small-displacement scooters and using solenoid valves to control the air volume of the intake valve, the problems of insufficient low-speed torque and poor fuel economy are solved, and a better driving experience and fuel efficiency are achieved.
Patent Information
- Application Number
- CN202422056938.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-22
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-08-22
AI Technical Summary
Small-displacement scooters have low torque at low speeds and poor fuel economy, resulting in poor user driving experience.
The variable valve lift system is adopted to achieve different air volume control of the intake valve through the camshaft, intake swing arm shaft and solenoid valve arranged in the cylinder head, thereby improving low-speed torque and fuel economy.
It effectively improves low-speed torque, improves fuel economy, improves user driving experience, and achieves the convenience of replacement of different cams.
Smart Images
Figure CN222863480U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of motorcycle engines, in particular to a variable valve lift of a scooter. Background Art
[0002] Currently, low-power scooters usually have low low-speed torque, poor fuel economy, and a poor user driving experience.
[0003] Variable valve lift system, or VVA technology, is commonly used in large-displacement engines and cross-country engines, and is usually suitable for 400cc engine motorcycles. However, this technology is often used in water-cooled machines, which have a relatively high cost. As a result, small-displacement engines such as 125cc to 150cc are usually not equipped with this technology due to cost considerations. Summary of the invention
[0004] The purpose of the utility model is to provide a variable valve lift for a scooter, which provides variable valve lift for a small-displacement motorcycle engine, effectively improves low-speed torque, greatly improves fuel economy, and enhances driving experience.
[0005] The purpose of the utility model is achieved in this way:
[0006] A variable valve lift for a scooter, comprising a camshaft arranged in a cylinder head, a first cam and a second cam being arranged on the camshaft, an intake swing arm shaft being arranged in the cylinder head and being located above the camshaft, a first swing arm having one end abutting against the first cam, a second swing arm having one end abutting against the second cam being rotatably arranged on the intake swing arm shaft, the other end of the first swing arm driving the intake valve to move up and down through a spring, a sliding hole being provided on the first swing arm, a locking pin being slidably provided in the sliding hole, a pin hole being provided on the second swing arm, an electromagnetic valve being provided on the cylinder head to drive the end of the locking pin to slide into the pin hole, when the electromagnetic valve drives the locking pin to slide into the pin hole, the first swing arm swings synchronously with the second swing arm with the second cam.
[0007] The utility model is further configured as follows: the cylinder head includes a cylinder head cover and a cylinder head stacked up and down, the solenoid valve is fixed to the side wall of the cylinder head cover by bolts, the input end of the solenoid valve extends into the cylinder head cover, and a push plate is fixed to the input end of the solenoid valve, the end of the locking pin is abutted against the side of the push plate, and the locking pin, the intake rocker arm shaft and the camshaft are parallel to each other.
[0008] The utility model is further configured such that an exhaust port connected to an exhaust valve is opened on one side of the cylinder head, an air supply channel connected to an upper end of the cylinder head is opened on the inner hole wall of the exhaust port, an air supply pipe is arranged at the upper end of the cylinder head cover, and an intake check valve is arranged at the end of the air supply pipe, and the other end of the air supply pipe is connected to the air supply channel.
[0009] The utility model is further configured that a plurality of heat dissipation fins are formed on the side wall of the cylinder head.
[0010] The utility model is further configured such that a torsion spring frame is fixed to the end of the intake swing arm shaft, a torsion spring is sleeved on the intake swing arm shaft, and one end of the torsion spring is abutted against the torsion spring frame, a push rod is provided on the side wall of the second swing arm, and the other end of the torsion spring is abutted against the push rod, and the torsion spring drives the end of the second swing arm to lift the intake valve.
[0011] The utility model is further configured that a sealing ring is provided between the cylinder head cover and the cylinder head, and the sealing ring is made of acrylic ester.
[0012] Compared with the prior art, the utility model has the following outstanding and beneficial technical effects:
[0013] 1. The variable valve lift provided by the utility model utilizes the control of the solenoid valve to enable the first swing arm to move independently or with the second swing arm. The two intake modes realize the control of different air volumes of the intake valve, so that the scooter can increase the torque at low speed, ensure the normal torque output at low speed, and improve fuel economy.
[0014] 2. The utility model further adopts a split structure for the cylinder head, which provides convenience for installation. At the same time, the parallel locking pin, intake rocker arm shaft and camshaft enable the locking pin to accurately enter the pin hole when the solenoid valve is driven, thereby realizing the replacement of different cams.
[0015] 3. The utility model further provides an air supply pipe that can provide oxygen to the tail gas, so that the tail gas burns more fully, protects the environment, and meets emission requirements.
[0016] 4. The utility model is provided with a torsion spring at the end of the intake swing arm shaft, which can be used to reset the swinging swing arm to ensure the normal operation of the next intake valve lift. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the structure of the utility model Figure 1 ;
[0018] Figure 2 This is a schematic diagram of the structure of the utility model Figure 2 ;
[0019] Figure 3 It is an explosion schematic diagram of the utility model;
[0020] Figure 4 It is a partial structure diagram of the utility model. Figure 1 ;
[0021] Figure 5 It is a partial structure diagram of the utility model. Figure 2 ;
[0022] Reference numerals:
[0023] 1-cylinder head; 10-cylinder head cover; 11-cylinder head; 12-exhaust port; 13-air supply channel; 14-cooling fins;
[0024] 15- sealing ring;
[0025] 2- camshaft; 20- first cam; 21- second cam;
[0026] 3-intake swing arm shaft; 30-torsion spring frame; 31-torsion spring;
[0027] 4-first swing arm; 40-sliding hole; 5-second swing arm; 50-pin hole; 51-retaining rod;
[0028] 6-intake valve; 7-lock pin; 8-solenoid valve; 80-push plate;
[0029] 9-air supply pipe; 90-air intake check valve. DETAILED DESCRIPTION
[0030] The present invention will be further described below with reference to the accompanying drawings. Figure 1 — Figure 5 :
[0031] A variable valve lift for a scooter, comprising a camshaft 2 arranged in a cylinder head 1, the camshaft 2 being provided with a first cam 20 and a second cam 21, an intake swing arm shaft 3 being arranged in the cylinder head 1 and being located above the camshaft 2, a first swing arm 4 having one end abutting against the first cam 20 and a second swing arm 5 having one end abutting against the second cam 21 being rotatably arranged on the intake swing arm shaft 3, the other end of the first swing arm 4 being driven by a spring to drive an intake valve 6 to move up and down, a sliding hole 40 being provided in the first swing arm 4, a locking pin 7 being slidably provided in the sliding hole 40, a pin hole 50 being provided in the second swing arm 5, an electromagnetic valve 8 being provided on the cylinder head 1 to drive the end of the locking pin 7 to slide into the pin hole 50, when the electromagnetic valve 8 drives the locking pin 7 to slide into the pin hole 50, the first swing arm 4 swings synchronously with the second swing arm 5 with the second cam 21.
[0032] The specific implementation process is:
[0033] When the solenoid valve 8 is not working, that is, the locking pin 7 is not inserted into the pin hole 50, the end of the first swing arm is against the first cam to work, and the first cam valve timing phase is designed for low speed, so that it has a good intake volume to ensure the torque output under low speed state.
[0034] After reaching a high speed, the solenoid valve 8 works to allow the lock pin 7 to be inserted into the pin hole 50, and the first swing arm swings simultaneously with the second swing arm. At this time, the first swing arm is changed by the second cam, which changes the valve timing, generation, etc., thereby greatly improving the high-speed performance of the engine.
[0035] The variable valve lift structure can ensure that the scooter has good low-speed performance as well as good high-speed performance, while greatly improving fuel economy and driving experience.
[0036] Preferably, the cylinder head 1 includes a cylinder head cover 10 and a cylinder head 11 stacked up and down, the solenoid valve 8 is fixed to the side wall of the cylinder head cover 10 by bolts, and its input end extends into the cylinder head cover 10, and a push plate 80 is fixed to the input end of the solenoid valve 8, and the end of the locking pin 7 is abutted against the side of the push plate 80, and the locking pin 7, the intake rocker arm shaft 3 and the camshaft 2 are parallel to each other.
[0037] The mutually parallel locking pin, intake rocker arm shaft and camshaft enable the locking pin to accurately enter the pin hole when the solenoid valve is driven, thereby realizing the conversion of the cam.
[0038] Preferably, an exhaust port 12 connected to the exhaust valve is opened on one side of the cylinder head 11, and an air supply channel 13 connected to the upper end of the cylinder head 11 is opened on the inner hole wall of the exhaust port 12. An air supply pipe 9 is provided at the upper end of the cylinder head cover 10, and an intake check valve 90 is provided at the end of the air supply pipe 9, and the other end of the air supply pipe 9 is connected to the air supply channel 13.
[0039] In the above structure, the air intake check valve 90 is used to ensure that the oxygen in the air supply pipe is purer and to allow the exhaust gas at the exhaust to be fully burned, thereby protecting the environment and meeting the emission requirements.
[0040] Preferably, a plurality of cooling fins 14 are formed on the side wall of the cylinder head 11 to achieve air cooling and heat dissipation.
[0041] Preferably, a torsion spring frame 30 is fixed to the end of the intake swing arm shaft 3, a torsion spring 31 is sleeved on the intake swing arm shaft 3, and one end of the torsion spring 31 abuts against the torsion spring frame 30, a side wall of the second swing arm 5 is provided with a push rod 51, and the other end of the torsion spring 31 abuts against the push rod 51, and the torsion spring 31 drives the end of the second swing arm 5 to lift the intake valve 6. The torsion spring 31 is used to achieve the reset of the swing arm after each lift.
[0042] Preferably, a sealing ring 15 is provided between the cylinder head cover 10 and the cylinder head 11, and the sealing ring 15 is made of acrylic ester to improve the sealing performance between the two.
[0043] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A variable valve lift for a scooter, comprising a camshaft (2) arranged in a cylinder head (1), wherein the camshaft (2) is provided with a first cam (20) and a second cam (21), wherein: An intake swing arm shaft (3) located above the camshaft (2) is arranged in the cylinder head (1). A first swing arm (4) with one end abutting against a first cam (20) and a second swing arm (5) with one end abutting against a second cam (21) are rotatably arranged on the intake swing arm shaft (3). The other end of the first swing arm (4) drives an intake valve (6) to move up and down through a spring. A sliding hole (40) is provided on the first swing arm (4). A lock pin (7) is slidably arranged in the sliding hole (40). A pin hole (50) is provided on the second swing arm (5). An electromagnetic valve (8) is arranged on the cylinder head (1) to drive the end of the lock pin (7) to slide into the pin hole (50). When the electromagnetic valve (8) drives the lock pin (7) to slide into the pin hole (50), the first swing arm (4) swings synchronously with the second swing arm (5) with the second cam (21).
2. The variable valve lift of a scooter according to claim 1, characterized in that: The cylinder head (1) comprises a cylinder head cover (10) and a cylinder head (11) stacked up and down, the solenoid valve (8) is fixed to the side wall of the cylinder head cover (10) by means of bolts, and its input end extends into the cylinder head cover (10), and a push plate (80) is fixed to the input end of the solenoid valve (8), the end of the locking pin (7) abuts against the side of the push plate (80), and the locking pin (7), the intake rocker arm shaft (3) and the camshaft (2) are parallel to each other.
3. The variable valve lift of a scooter according to claim 2, characterized in that: An exhaust port (12) connected to an exhaust valve is provided on one side of the cylinder head (11); an air supply passage (13) connected to the upper end of the cylinder head (11) is provided on the inner hole wall of the exhaust port (12); an air supply pipe (9) is provided at the upper end of the cylinder head cover (10); an air intake check valve (90) is provided at the end of the air supply pipe (9), and the other end of the air supply pipe (9) is connected to the air supply passage (13).
4. The variable valve lift of a scooter according to claim 2, characterized in that: A plurality of heat dissipation fins (14) are formed on the side wall of the cylinder head (11).
5. The variable valve lift of a scooter according to claim 1, characterized in that: A torsion spring frame (30) is fixed to the end of the intake swing arm shaft (3), a torsion spring (31) is sleeved on the intake swing arm shaft (3), and one end of the torsion spring (31) abuts against the torsion spring frame (30), a side wall of the second swing arm (5) is provided with a push rod (51), and the other end of the torsion spring (31) abuts against the push rod (51), and the torsion spring (31) drives the end of the second swing arm (5) to lift the intake valve (6).
6. The variable valve lift of a scooter according to claim 2, characterized in that: A sealing ring (15) is arranged between the cylinder head cover (10) and the cylinder head (11), and the sealing ring (15) is made of acrylic acid.